Vitamin K1 2,3-epoxide (CAS: 25486-55-9) is a vitamin K derivative. Vitamin K is needed for the posttranslational modification of certain proteins, mostly required for blood coagulation. Within the cell, vitamin K undergoes electron reduction to a reduced form of vitamin K (called vitamin K hydroquinone) by the enzyme vitamin K epoxide reductase (or VKOR). Another enzyme then oxidizes vitamin K hydroquinone to allow carboxylation of glutamate into gamma-carboxyglutamate (Gla). This enzyme is called the gamma-glutamyl carboxylase or the vitamin K-dependent carboxylase. The carboxylation reaction will only proceed if the carboxylase enzyme is able to oxidize vitamin K hydroquinone into vitamin K epoxide at the same time; the carboxylation and epoxidation reactions are said to be coupled reactions. Vitamin K epoxide is then re-converted into vitamin K by the vitamin K epoxide reductase. These two enzymes comprise the so-called vitamin K cycle. One of the reasons why vitamin K is rarely deficient in a human diet is because vitamin K is continually recycled in our cells. Vitamin K 2,3-epoxide is the substrate for vitamin K 2,3-epoxide reductase (VKOR) complex. Significantly increased level of serum vitamin K epoxide has been found in patients with familial multiple coagulation factor deficiency (PMID: 12384421). Accumulation of vitamin K1-2,3-epoxide in plasma is also a sensitive marker of the coumarin-like activity of drugs (PMID: 2401753).
Phosphocreatinine is found in milk.
CGP72383 is a metabolite of Imatinib. Cgp72383 belongs to the family of Acyclic Alkanes. These are acyclic hydrocarbons consisting only of n carbon atoms and m hydrogen atoms where m=2*n + 2.
Xylose or wood sugar is an aldopentose - a monosaccharide containing five carbon atoms and an aldehyde functional group. It has chemical formula C5H10O5 and is 40% as sweet as sucrose. Xylose is found in the embryos of most edible plants. The polysaccharide xylan, which is closely associated with cellulose, consists practically entirely of d-xylose. Corncobs, cottonseed hulls, pecan shells, and straw contain considerable amounts of this sugar. Xylose is also found in mucopolysaccharides of connective tissue and sometimes in the urine. Xylose is the first sugar added to serine or threonine residues during proteoglycan type O-glycosylation. Therefore xylose is involved in the biosythetic pathways of most anionic polysaccharides such as heparan sulphate and chondroitin sulphate. In medicine, xylose is used to test for malabsorption by administering a xylose solution to the patient after fasting. If xylose is detected in the blood and/or urine within the next few hours, it has been absorbed by the intestines. Xylose is said to be one of eight sugars which are essential for human nutrition, the others being galactose, glucose, mannose, N-acetylglucosamine, N-acetylgalactosamine, fucose, and sialic acid. (Wikipedia). Xylose in the urine is a biomarker for the consumption of apples and other fruits.
D-Galactose (CAS: 59-23-4) is an aldohexose that occurs naturally in the D-form in lactose, cerebrosides, gangliosides, and mucoproteins. D-Galactose is an energy-providing nutrient and also a necessary basic substrate for the biosynthesis of many macromolecules in the body. Metabolic pathways for D-galactose are important not only for the provision of these pathways but also for the prevention of D-galactose metabolite accumulation. The main source of D-galactose is lactose in the milk of mammals, but it can also be found in some fruits and vegetables. Utilization of D-galactose in all living cells is initiated by the phosphorylation of the hexose by the enzyme galactokinase (E.C. 2.7.1.6) (GALK) to form D-galactose-1-phosphate. In the presence of D-galactose-1-phosphate uridyltransferase (E.C. 2.7.7.12) (GALT) D-galactose-1-phosphate is exchanged with glucose-1-phosphate in UDP-glucose to form UDP-galactose. Glucose-1-phosphate will then enter the glycolytic pathway for energy production. Deficiency of the enzyme GALT in galactosemic patients leads to the accumulation of D-galactose-1-phosphate. Classic galactosemia, a term that denotes the presence of D-galactose in the blood, is the rare inborn error of D-galactose metabolism, diagnosed by the deficiency of the second enzyme of the D-galactose assimilation pathway, GALT, which, in turn, is caused by mutations at the GALT gene (PMID: 15256214, 11020650, 10408771). Galactose in the urine is a biomarker for the consumption of milk.
Galactitol or dulcitol is a sugar alcohol that is a metabolic breakdown product of galactose. Galactose is derived from lactose in food (such as dairy products). When lactose is broken down by the enzyme lactase it produces glucose and galactose. Galactitol has a slightly sweet taste. It is produced from galactose in a reaction catalyzed by aldose reductase. When present in sufficiently high levels, galactitol can act as a metabotoxin, a neurotoxin, and a hepatotoxin. A neurotoxin is a compound that disrupts or attacks neural cells and neural tissue. A hepatotoxin as a compound that disrupts or attacks liver tissue or liver cells. A metabotoxin is an endogenously produced metabolite that causes adverse health effects at chronically high levels. Chronically high levels of galactitol are associated with at least two inborn errors of metabolism, including galactosemia and galactosemia type II. Galactosemia is a rare genetic metabolic disorder that affects an individual's ability to metabolize the sugar galactose properly. Excess lactose consumption in individuals with galactose intolerance or galactosemia activates aldose reductase to produce galactitol, thus depleting NADPH and leading to lowered glutathione reductase activity. As a result, hydrogen peroxide or other free radicals accumulate causing serious oxidative damage to various cells and tissues. In individuals with galactosemia, the enzymes needed for the further metabolism of galactose (galactose-1-phosphate uridyltransferase) are severely diminished or missing entirely, leading to toxic levels of galactose 1-phosphate, galactitol, and galactonate. High levels of galactitol in infants are specifically associated with hepatomegaly (an enlarged liver), cirrhosis, renal failure, cataracts, vomiting, seizure, hypoglycemia, lethargy, brain damage, and ovarian failure.
Vanillic acid is a phenolic acid found in some forms of vanilla and many other plant extracts. It is a flavouring and scent agent that produces a pleasant, creamy odour. It is the intermediate product in the two-step bioconversion of ferulic acid to vanillin (J Biotechnol 1996;50(2-3):107-13). Vanillic acid, which is a chlorogenic acid, is an oxidized form of vanillin. It is also an intermediate in the production of vanillin from ferulic acid. Vanillic acid is a metabolic byproduct of caffeic acid and is often found in the urine of humans who have consumed coffee, chocolate, tea, and vanilla-flavoured confectionary. Vanillic acid selectively and specifically inhibits 5'nucleotidase activity (PMID: 16899266). Vanillic acid is a microbial metabolite found in Amycolatopsis, Delftia, and Pseudomonas (PMID: 11152072, 10543794, 11728709, 9579070).
ortho-Hydroxyphenylacetic acid, also known as (o-hydroxyphenyl)acetate or 2-hydroxybenzeneacetic acid, is a member of the class of compounds known as 2(hydroxyphenyl)acetic acids. 2(Hydroxyphenyl)acetic acids are phenylacetic acids that carry a hydroxyl group at the 2-position. ortho-Hydroxyphenylacetic acid is slightly soluble (in water) and a weakly acidic compound (based on its pKa). ortho-Hydroxyphenylacetic acid can be found in a number of food items such as natal plum, lemon verbena, half-highbush blueberry, and parsley, which makes ortho-hydroxyphenylacetic acid a potential biomarker for the consumption of these food products. ortho-Hydroxyphenylacetic acid can be found primarily in blood, feces, and urine. Moreover, ortho-hydroxyphenylacetic acid is found to be associated with phenylketonuria, which is an inborn error of metabolism. ortho-Hydroxyphenylacetic acid is a substrate of the enzyme oxidoreductases (EC 1.14.13.-) in the pathway styrene degradation (KEGG). ortho-Hydroxyphenylacetic acid is also a microbial metabolite.
Ribonic acid (CAS: 17812-24-7) is a product of the enzyme ribose 1-dehydrogenase (NADP+) [EC 1.1.1.115] (KEGG).
trans-Ferulic acid is a highly abundant phenolic phytochemical which is present in plant cell walls. Ferulic acid is a phenolic acid that can be absorbed by the small intestine and excreted through the urine. It is one of the most abundant phenolic acids in plants, varying from 5 g/kg in wheat bran to 9 g/kg in sugar-beet pulp and 50 g/kg in corn kernel. It occurs primarily in seeds and leaves both in its free form (albeit rarely) and covalently linked to lignin and other biopolymers. It is usually found as ester cross-links with polysaccharides in the cell wall, such as arabinoxylans in grasses, pectin in spinach and sugar beet, and xyloglucans in bamboo. It also can cross-link with proteins. Due to its phenolic nucleus and an extended side chain conjugation (carbohydrates and proteins), it readily forms a resonance-stabilized phenoxy radical which accounts for its potent antioxidant potential. Food supplementation with curcumin and ferulic acid is considered a nutritional approach to reducing oxidative damage and amyloid pathology in Alzheimer disease (PMID:17127365, 1398220, 15453708, 9878519). Ferulic acid can be found in Pseudomonas and Saccharomyces (PMID:8395165).
Aminocaproic acid (marketed as Amicar) is a drug used to treat bleeding disorders. It is an antifibrinolytic agent that acts by inhibiting plasminogen activators which have fibrinolytic properties. It is a derivative of the amino acid lysine. It binds reversibly to the kringle domain of plasminogen and blocks the binding of plasminogen to fibrin and its activation to plasmin.
2,5-Furandicarboxylic acid is a normal urinary metabolite in humans. (PMID:14708889, 8087979, 2338430, 3711221). Dietary studies show that the furan derivatives or their precursors are of exogenous origin. They are originated from furan derivatives found in food prepared by strong heating. This may explain the absence of 2,5-furandicarboxylic acid in urine of breastfed children, and the absence of these acids in the urine of rats, pigs, cows, oxs, rabbits, and monkeys (PMID 4630229). 2,5-Furandicarboxylic acid is also a microbial metabolite, a product of the oxidation of hydroxymethylfurfural (HMF) by the enzyme furfural/HMF oxidoreductase which is found in the bacterium Cupriavidus basilensis. Cupriavidus basilensis is a gram-negative soil bacterium of the genus Cupriavidus and the family Burkholderiaceae. 2,5-Furandicarboxylic acid increases with the level of fructose consumed (PMID:20194784).
3-Hydroxyhippuric acid is an acyl glycine. Acyl glycines are normally minor metabolites of fatty acids. However, the excretion of certain acyl glycines is increased in several inborn errors of metabolism. In certain cases the measurement of these metabolites in body fluids can be used to diagnose disorders associated with mitochondrial fatty acid beta-oxidation. Acyl glycines are produced through the action of glycine N-acyltransferase (EC 2.3.1.13) which is an enzyme that catalyzes the chemical reaction: acyl-CoA + glycine < -- > CoA + N-acylglycine. 3-Hydroxyhippuric acid is an organic acid found in normal human urine. 3-Hydroxyhippuric acid is a metabolite of rutin detected in urine after consumption of tomato juice (a source of rutin). 3-Hydroxyhippuric acid has its origin in dietary procyanidins (a major source of polyphenols consisting of elementary flavan-3-ol (epi)catechin units). 3-Hydroxyhippuric acid is a microbial aromatic acid metabolite derived from dietary polyphenols and flavonoids, found in normal human urine (PMID: 12592675, 2338430, 17015248, 14556848, 12742116). It is a marker of gut Clostridium species. Higher levels are associated with higher levels of Clostridia (PMID: 27123458).
1,2,4-Trimethylbenzene is a colorless liquid with chemical formula C9H12. It is a flammable aromatic hydrocarbon with a strong odor. It occurs naturally in coal tar and petroleum (about 3%). It is nearly insoluble in water, but well-soluble in ethanol, diethyl ether, and benzene.
Isopropylbenzene, also known as 2-phenylpropane or benzene, isopropyl, belongs to the class of organic compounds known as cumenes. These are aromatic compounds containing a prop-2-ylbenzene moiety.  Isopropylbenzene is found, on average, in the highest concentration within ceylon cinnamons and gingers. Isopropylbenzene has also been detected, but not quantified, in several different foods, such as celery stalks, cumins , herbs and spices, and sweet cherries. Isopropylbenzene is formally rated as a possible carcinogen (by IARC 2B) and is also a potentially toxic compound. Isopropylbenzene is a component of petroleum destillates. Petroleum distillate poisoning may cause nausea, vomiting, cough, pulmonary irritation progressing to pulmonary edema, bloody sputum, and bronchial pneumonia. Petroleum distillates are also irritating to the skin. Petroleum distillates are aspiration hazards and may cause pulmonary damage, central nervous system depression, and cardiac effects such as cardiac arrhythmias. They may also affect the blood, immune system, liver, and kidney. At high amounts, central nervous system depression may also occur, with symptoms such as weakness, dizziness, slow and shallow respiration, unconsciousness, and convulsions.  Gastric lavage, emesis, and the administration of activated charcoal should be avoided, as vomiting increases the risk of aspiration.  Treatment is mainly symptomatic and supportive. Volatile hydrocarbons are absorbed mainly through the lungs, and may also enter the body after ingestion via aspiration.
Butyl octadecanoate is found in common grape. Butyl octadecanoate is a flavouring agent; defoaming agent used in processing beet sugar and yeast.
1,2,4-Trimethylbenzene is a colorless liquid with chemical formula C9H12. It is a flammable aromatic hydrocarbon with a strong odor. It occurs naturally in coal tar and petroleum (about 3%). It is nearly insoluble in water, but well-soluble in ethanol, diethyl ether, and benzene.
m-Ethyl_toluene belongs to the family of Toluenes. These are compounds containing a benzene ring which bears a methane group.
3,4-Dihydroxymandelic acid, also known as DOMA or 3,4-dihydroxyphenylglycolate, belongs to the class of organic compounds known as catechols. Catechols are compounds containing a 1,2-benzenediol moiety. 3,4-Dihydroxymandelic acid exists in all living organisms, ranging from bacteria to humans. Within humans, 3,4-dihydroxymandelic acid participates in a number of enzymatic reactions. In particular, 3,4-dihydroxymandelic acid can be biosynthesized from 3,4-dihydroxymandelaldehyde through its interaction with the enzyme aldehyde dehydrogenase, dimeric nadp-preferring. In addition, 3,4-dihydroxymandelic acid and guaiacol can be converted into vanillylmandelic acid and pyrocatechol through the action of the enzyme catechol O-methyltransferase. In humans, 3,4-dihydroxymandelic acid is involved in the metabolic disorder called tyrosinemia type I. Outside of the human body, 3,4-Dihydroxymandelic acid has been detected, but not quantified in several different foods, such as yellow wax beans, soy beans, pomegranates, cucurbita (gourd), and daikon radish.
3-(4-Hydroxy-3-methoxyphenyl)-2-methylpropionic acid is a metabolite of carbidopa. Carbidopa (Lodosyn) is a drug given to people with Parkinson's disease in order to inhibit peripheral metabolism of levodopa. This property is significant in that it allows a greater proportion of peripheral levodopa to cross the blood brain barrier for central nervous system effect. (Wikipedia)
1-Deoxy-D-glucitol is found in herbs and spices. 1-Deoxy-D-glucitol is a constituent of the fruit of Foeniculum vulgare (fennel).
D-Xylulose (CAS: 551-84-8) is a monosaccharide containing five carbon atoms. D-Xylulose is converted from xylitol by the enzyme NAD+-linked xylitol dehydrogenase (EC 1.1.1.9) in the glucuronate pathway, the most important xylitol-handling metabolic pathway in mammals. This activity has been described in human erythrocytes. Most likely, D-xylulose (as well as D-arabinose or D-ribulose) is a precursor of the pentiol D-arabitol, since pentitols are derived from their corresponding pentose phosphate precursors via pentoses. This pathway can play a role in inherited metabolic disorders underlying the accumulation of pentitols (e.g. ribose 5-phosphate isomerase deficiency and transaldolase deficiency). Although pentitols are present in all living organisms, knowledge concerning their metabolism is limited (PMID:15234337, Mol Genet Metab. 2004 Jul;82(3):231-7.).
2-Aminoisobutyric acid, also known as alpha-methylalanine or a-aminoisobutanoate, belongs to the class of organic compounds known as alpha amino acids. These are amino acids in which the amino group is attached to the carbon atom immediately adjacent to the carboxylate group (alpha carbon). 2-Aminoisobutyric acid is a very hydrophobic molecule, practically insoluble in water, and relatively neutral. 2-Aminoisobutyric acid exists in all living organisms, ranging from bacteria to humans. Outside of the human body, 2-Aminoisobutyric acid has been detected, but not quantified in cow milk. Aminoisobutyric acid is a nonprotein amino acid (is an end product of pyrimidine metabolism) excreted in the urine of about 5% of healthy individuals (PMID 14806475), and high excretion is an autosomal recessive phenotype (PMID 13058271).
L-Gulonolactone (also known as reduced ascorbic acid, RAA) is the substrate of the enzyme L-gulono-1,4-lactone oxidoreductase (EC 1.1.3.8), which catalyzes the last step of the biosynthesis of L-ascorbic acid (vitamin C) in plants and animals. The enzyme L-Gulono-1,4-lactone oxidase is missing in scurvy-prone, vitamin C-deficient animals, such as humans. L-Gulonolactone is present in human blood and has been used as one of the markers to compare changes in exercise-induced oxidative stress. (PMID:16956367, 16494601).
Sedoheptulose (CAS: 3019-74-7) is a ketoheptose, a monosaccharide with seven carbon atoms and a ketone functional group. It is one of the few heptoses found in nature. Sedoheptulose is a seven-carbon ketose sugar originally found in Sedum spectabile, a common perennial garden plant. Later it was shown to be widely distributed in the plants of the Crassulaceae family. The Crassulaceae, or orpine family, is a family of dicotyledons. They store water in their succulent leaves. They are found worldwide, but mostly occur in the northern hemisphere and southern Africa, typically in dry and/or cold areas where water may be scarce. The family includes about 1,400 species in 33 genera. As a result, this sugar is often found to be part of the human diet. This sugar, D-sedoheptulose, is a significant intermediary compound in the cyclic regeneration of D-ribulose. It also plays an important role as a transitory compound in the cyclic regeneration of D-ribulose for carbon dioxide fixation in plant photosynthesis.
Sedoheptulose (CAS: 3019-74-7) is a ketoheptose, a monosaccharide with seven carbon atoms and a ketone functional group. It is one of the few heptoses found in nature. Sedoheptulose is a seven-carbon ketose sugar originally found in Sedum spectabile, a common perennial garden plant. Later it was shown to be widely distributed in the plants of the Crassulaceae family. The Crassulaceae, or orpine family, is a family of dicotyledons. They store water in their succulent leaves. They are found worldwide, but mostly occur in the northern hemisphere and southern Africa, typically in dry and/or cold areas where water may be scarce. The family includes about 1,400 species in 33 genera. As a result, this sugar is often found to be part of the human diet. This sugar, D-sedoheptulose, is a significant intermediary compound in the cyclic regeneration of D-ribulose. It also plays an important role as a transitory compound in the cyclic regeneration of D-ribulose for carbon dioxide fixation in plant photosynthesis.
beta-D-Galactopyranosyl-(1->4)-beta-D-galactopyranosyl-(1->4)-D-galactose, also known as b-D-galactopyranosyl-(1->4)-b-D-galactopyranosyl-(1->4)-D-galactose belongs to the class of organic compounds known as oligosaccharides or glycans. These are carbohydrates made up of 3 to 10 monosaccharide units linked to each other through glycosidic bonds. beta-D-galactopyranosyl-(1->4)-beta-D-galactopyranosyl-(1->4)-D-galactose has been detected, but not quantified, in root vegetables.
LysoPE(22:0/0:0) is a lysophosphatidylethanolamine or a lysophospholipid. The term 'lysophospholipid' (LPL) refers to any phospholipid that is missing one of its two O-acyl chains. Thus, LPLs have a free alcohol in either the sn-1 or sn-2 position. The prefix 'lyso-' comes from the fact that lysophospholipids were originally found to be hemolytic however it is now used to refer generally to phospholipids missing an acyl chain. LPLs are usually the result of phospholipase A-type enzymatic activity on regular phospholipids such as phosphatidylcholine or phosphatidic acid, although they can also be generated by the acylation of glycerophospholipids or the phosphorylation of monoacylglycerols. Some LPLs serve important signaling functions such as lysophosphatidic acid. Lysophosphatidylethanolamines (LPEs) can function as plant growth regulators with several diverse uses. (LPEs) are approved for outdoor agricultural use to accelerate ripening and improve the quality of fresh produce. They are also approved for indoor use to preserve stored crops and commercial cut flowers. As a breakdown product of phosphatidylethanolamine (PE), LPE is present in cells of all organisms.
LysoPC(20:3(5Z,8Z,11Z)) is a lysophospholipid (LyP). It is a monoglycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. Lysophosphatidylcholines can have different combinations of fatty acids of varying lengths and saturation attached at the C-1 (sn-1) position. Fatty acids containing 16, 18 and 20 carbons are the most common. LysoPC(20:3(5Z,8Z,11Z)), in particular, consists of one chain of mead acid at the C-1 position. The mead acid moiety is derived from fish oils, liver and kidney. Lysophosphatidylcholine is found in small amounts in most tissues. It is formed by hydrolysis of phosphatidylcholine by the enzyme phospholipase A2, as part of the de-acylation/re-acylation cycle that controls its overall molecular species composition. It can also be formed inadvertently during extraction of lipids from tissues if the phospholipase is activated by careless handling. In blood plasma significant amounts of lysophosphatidylcholine are formed by a specific enzyme system, lecithin:cholesterol acyltransferase (LCAT), which is secreted from the liver. The enzyme catalyzes the transfer of the fatty acids of position sn-2 of phosphatidylcholine to the free cholesterol in plasma, with formation of cholesterol esters and lysophosphatidylcholine. Lysophospholipids have a role in lipid signaling by acting on lysophospholipid receptors (LPL-R). LPL-R's are members of the G protein-coupled receptor family of integral membrane proteins.
LysoPC(20:1(11Z)) is a lysophospholipid (LyP). It is a monoglycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. Lysophosphatidylcholines can have different combinations of fatty acids of varying lengths and saturation attached at the C-1 (sn-1) position. Fatty acids containing 16, 18 and 20 carbons are the most common. LysoPC(20:1(11Z)), in particular, consists of one chain of eicosenoic acid at the C-1 position. The eicosenoic acid moiety is derived from vegetable oils and cod oils. Lysophosphatidylcholine is found in small amounts in most tissues. It is formed by hydrolysis of phosphatidylcholine by the enzyme phospholipase A2, as part of the de-acylation/re-acylation cycle that controls its overall molecular species composition. It can also be formed inadvertently during extraction of lipids from tissues if the phospholipase is activated by careless handling. In blood plasma significant amounts of lysophosphatidylcholine are formed by a specific enzyme system, lecithin:cholesterol acyltransferase (LCAT), which is secreted from the liver. The enzyme catalyzes the transfer of the fatty acids of position sn-2 of phosphatidylcholine to the free cholesterol in plasma, with formation of cholesterol esters and lysophosphatidylcholine. Lysophospholipids have a role in lipid signaling by acting on lysophospholipid receptors (LPL-R). LPL-R's are members of the G protein-coupled receptor family of integral membrane proteins.
Dodecanedioic acid is an aliphatic dicarboxylic acid containing 12 carbon atoms. More formally it is an alpha,omega-dicarboxylic acid with both the first and last carbons of the aliphatic chain having carboxylic acids. Dodecanedioic acid is water soluble. It can be produced in yeast and fungi through the oxidation of dodecane via fungal peroxygenases (PMID: 27573441). High levels of dodecanedioic acid is an indicator of hepatic carnitine palmitoyltransferase I (CPT IA) deficiency (PMID: 16146704). CPT IA deficiency is characterized by hypoketotic dicarboxylic aciduria with high urinary levels of dodecanedioic acid. It is thought that carnitine palmitoyltransferase I may play a role in the uptake of long-chain dicarboxylic acids by mitochondria after their initial shortening by beta-oxidation in peroxisomes (PMID: 16146704). CPT IA deficiency is characterized by acute encephalopathy with hypoglycemia and hepatomegaly.
Homoanserine (N-(4-Aminobutyryl)-L-histidine) is a dipeptide identified in the brain and muscles of mammals. (PMID 3780724, 6078589) It has been found that homoanserine is not merely deposited in skeletal muscles but that is actively synthesized by muscle cells in culture. (PMID 8307008).
Palmitoylglycine is an acylglycine with C-16 fatty acid group as the acyl moiety. Acylglycines 1 possess a common amidoacetic acid moiety and are normally minor metabolites of fatty acids. Elevated levels of certain acylglycines appear in the urine and blood of patients with various fatty acid oxidation disorders. They are normally produced through the action of glycine N-acyltransferase which is an enzyme that catalyzes the chemical reaction: acyl-CoA + glycine &#8596; CoA + N-acylglycine.
LysoPE(18:0/0:0) or LPE(18:0/0:0) is a lysophospholipid. The term 'lysophospholipid' (LPL) refers to any phospholipid that is missing one of its two O-acyl chains. Thus, LPLs have a free alcohol in either the sn-1 or sn-2 position. The prefix 'lyso-' comes from the fact that lysophospholipids were originally found to be hemolytic however it is now used to refer generally to phospholipids missing an acyl chain. LPLs are usually the result of phospholipase A-type enzymatic activity on regular phospholipids such as phosphatidylcholine or phosphatidic acid, although they can also be generated by the acylation of glycerophospholipids or the phosphorylation of monoacylglycerols. Some LPLs serve important signaling functions such as lysophosphatidic acid. Lysophosphatidylethanolamines (LPEs) can function as plant growth regulators with several diverse uses. (LPEs) are approved for outdoor agricultural use to accelerate ripening and improve the quality of fresh produce. They are also approved for indoor use to preserve stored crops and commercial cut flowers. As a breakdown product of phosphatidylethanolamine (PE), LPE is present in cells of all organisms.
leukotriene D5 is coverted from 5-hydroxy-6-S-glutathionyl-7,9,11,14,17-eicosapentaenoic acid (leukotriene C5) by gamma-glutamyl transpeptidase. Leukotrienes are eicosanoids. The eicosanoids consist of the prostaglandins (PGs), thromboxanes (TXs), leukotrienes (LTs), and lipoxins (LXs). The PGs and TXs are collectively identified as prostanoids. Prostaglandins were originally shown to be synthesized in the prostate gland, thromboxanes from platelets (thrombocytes), and leukotrienes from leukocytes, hence the derivation of their names. All mammalian cells except erythrocytes synthesize eicosanoids. These molecules are extremely potent, able to cause profound physiological effects at very dilute concentrations. All eicosanoids function locally at the site of synthesis, through receptor-mediated G-protein linked signalling pathways.
LysoPE(0:0/22:5(7Z,10Z,13Z,16Z,19Z)) is a lysophosphatidylethanolamine or a lysophospholipid. The term 'lysophospholipid' (LPL) refers to any phospholipid that is missing one of its two O-acyl chains. Thus, LPLs have a free alcohol in either the sn-1 or sn-2 position. The prefix 'lyso-' comes from the fact that lysophospholipids were originally found to be hemolytic however it is now used to refer generally to phospholipids missing an acyl chain. LPLs are usually the result of phospholipase A-type enzymatic activity on regular phospholipids such as phosphatidylcholine or phosphatidic acid, although they can also be generated by the acylation of glycerophospholipids or the phosphorylation of monoacylglycerols. Some LPLs serve important signaling functions such as lysophosphatidic acid. Lysophosphatidylethanolamines (LPEs) can function as plant growth regulators with several diverse uses. (LPEs) are approved for outdoor agricultural use to accelerate ripening and improve the quality of fresh produce. They are also approved for indoor use to preserve stored crops and commercial cut flowers. As a breakdown product of phosphatidylethanolamine (PE), LPE is present in cells of all organisms.
LysoPC(22:5(4Z,7Z,10Z,13Z,16Z)) is a lysophospholipid (LyP). It is a monoglycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. Lysophosphatidylcholines can have different combinations of fatty acids of varying lengths and saturation attached at the C-1 (sn-1) position. Fatty acids containing 16, 18 and 20 carbons are the most common. LysoPC(22:5(4Z,7Z,10Z,13Z,16Z)), in particular, consists of one chain of docosapentaenoic acid at the C-1 position. The docosapentaenoic acid moiety is derived from animal fats and brain. Lysophosphatidylcholine is found in small amounts in most tissues. It is formed by hydrolysis of phosphatidylcholine by the enzyme phospholipase A2, as part of the de-acylation/re-acylation cycle that controls its overall molecular species composition. It can also be formed inadvertently during extraction of lipids from tissues if the phospholipase is activated by careless handling. In blood plasma significant amounts of lysophosphatidylcholine are formed by a specific enzyme system, lecithin:cholesterol acyltransferase (LCAT), which is secreted from the liver. The enzyme catalyzes the transfer of the fatty acids of position sn-2 of phosphatidylcholine to the free cholesterol in plasma, with formation of cholesterol esters and lysophosphatidylcholine. Lysophospholipids have a role in lipid signaling by acting on lysophospholipid receptors (LPL-R). LPL-R's are members of the G protein-coupled receptor family of integral membrane proteins.
Plasma norepinephrine sulfate increases after sympathetic nervous system activation by an exhausting incremental exercise test and remain elevated up to 2 h after exercise. (PMID: 8330610). Human platelets contribute to the formation of plasma norepinephrine sulfate by norepinephrine uptake, intraplatelet sulfoconjugation and release of norepinephrine sulfate. (PMID: 7968241). Higher concentrations of norepinephrine sulfate in portal venous than arterial plasma indicate substantial production of norepinephrine by mesenteric organs. (PMID: 8627312). Intravenously infused norepinephrine is sulfoconjugated in humans, indicating that a major part of NE is sulfoconjugated in blood or at sites easily accessible from blood. (PMID: 12020748).
4-Hydroxynonenal (HNE), one of the major end products of lipid peroxidation, has been shown to be involved in signal transduction and available evidence suggests that it can affect cell cycle events in a concentration-dependent manner. glutathione S-transferases (GSTs) can modulate the intracellular concentrations of HNE by affecting its generation during lipid peroxidation by reducing hydroperoxides and also by converting it into a glutathione conjugate. Overexpression of the Alpha class GSTs in cells leads to lower steady-state levels of HNE, and these cells acquire resistance to apoptosis induced by lipid peroxidation-causing agents such as H(2)O(2), UVA, superoxide anion, and pro-oxidant xenobiotics, suggesting that signaling for apoptosis by these agents is transduced through HNE. Cells with the capacity to exclude HNE from the intracellular environment at a faster rate are relatively more resistant to apoptosis caused by H(2)O(2), UVA, superoxide anion, and pro-oxidant xenobiotics as well as by HNE, suggesting that HNE may be a common denominator in mechanisms of apoptosis caused by oxidative stress. Transfection of adherent cells with HNE-metabolizing GSTs leads to transformation of these cells due to depletion of HNE. (PMID 15288119). HNE has also been identified as a uremic toxin according to the European Uremic Toxin Working Group (PMID: 22626821).
2-Pyrocatechuic acid is a normal human benzoic acid metabolite found in plasma (PMID 16351159), and is normally found with increased levels after consumption of many nutrients and drugs, i.e.: cranberry juice (PMID 14733499), aspirin ingestion. (PMID 3342084) It has been found associated with idiopathic oro-facial pain due to stress (oxidative stress might enhance the production of free radicals); it has been suggested that OH radicals are responsible for the production of many systemic and local tissue injury diseases which may initially manifest as pain syndrome, and 2-Pyrocatechuic acid is a biological marker for the detection and quantification of OH radicals, and patients had significantly increased circulating levels of 2-Pyrocatechuic acid after aspirin ingestion than control subjects. (PMID 7748148).
Aspartyl-Tyrosine is a dipeptide composed of aspartate and tyrosine. It is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis. This dipeptide has not yet been identified in human tissues or biofluids and so it is classified as an 'Expected' metabolite.
Glutaminyltyrosine is a dipeptide composed of glutamine and tyrosine. It is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis.
L-Aspartyl-4-phosphate belongs to the class of organic compounds known as aspartic acid and derivatives. Aspartic acid and derivatives are compounds containing an aspartic acid or a derivative thereof resulting from a reaction of aspartic acid at the amino group or the carboxy group, or from the replacement of any hydrogen of glycine by a heteroatom. L-Aspartyl-4-phosphate is a very strong basic compound (based on its pKa). L-Aspartyl-4-phosphate is involved in both the lysine biosynthesis I and homoserine biosynthesis pathways. L-Aspartyl-4-phosphate is produced from a reaction between L-aspartate and ATP, with ADP as a byproduct. The reaction is catalyzed by aspartate kinase. L-Aspartyl-4-phosphate reacts with NADPH to produce phosphate, L-aspartate-semialdehyde, and NADP+. Aspartate-semialdehyde dehydrogenase catalyzes this reaction.
17-Hydroxyprogesterone also known as 17-OH progesterone (17-OHP), or hydroxyprogesterone (OHP), is an endogenous progestogen steroid hormone related to progesterone. Formally it is a 17alpha-hydroxy steroid that is the 17alpha-hydroxy derivative of progesterone. 17-Hydroxyprogesterone is found in all vertebrates. It is a chemical intermediate in the biosynthesis of many endogenous steroids, including androgens, estrogens, glucocorticoids, mineralocorticoids and neurosteroids. In particular, 17-Hydroxyprogesterone serves as an intermediate in the biosynthesis of hydrocortisone and gonadal steroid hormones. It is derived from progesterone via the enzyme known as 17-hydroxylase, a cytochrome P450 enzyme also known as CYP17A1. It can also be biosynthesized from 17-hydroxypregnenolone via the enzyme 3beta-hydroxysteroid dehydrogenase/delta5-4 isomerase (PMID: 1955079). 17-OHP is an agonist of the progesterone receptor (PR). It is also an antagonist of the mineralocorticoid receptor (MR) as well as a partial agonist of the glucocorticoid receptor (GR). 17-Hydroxyprogesterone is a natural progestin and in pregnancy it increases in the third trimester primarily due to fetal adrenal production. 17-Hydroxyprogesterone is primarily produced in the adrenal glands and to some degree in the gonads, specifically the corpus luteum of the ovary. Normal levels are 3-90 ng/dl in children, and in women, 15-70 ng/dl prior to ovulation, and 35-290 ng/dl during the luteal phase. Measurements of levels of 17-hydroxyprogesterone are useful in the evaluation of patients with suspected congenital adrenal hyperplasia as the typical enzymes that are defective, namely 21-hydroxylase, lead to a build-up of 17-OHP. 17-OHP levels can also be used to measure contribution of progestational activity of the corpus luteum during pregnancy as progesterone but not 17-OHP is also contributed by the placenta.
Normetanephrine, also known as normetadrenaline or N111, belongs to the class of organic compounds known as methoxyphenols. Methoxyphenols are compounds containing a methoxy group attached to the benzene ring of a phenol moiety.  Normetanephrine is a solid that is soluble in water.  Normetanephrine is a metabolite of norepinephrine created by action of catechol-O-methyl transferase on norepinephrine. Within humans, normetanephrine participates in a number of enzymatic reactions. In particular, normetanephrine can be converted into 3-methoxy-4-hydroxyphenylglycolaldehyde through its interaction with the enzyme amine oxidase [flavin-containing] A.  It is also involved in the metabolic disorder called transient tyrosinemia of the newborn. This compound is excreted in the urine and is found in certain tissues. It is a marker for catecholamine-secreting tumors such as pheochromocytoma (PMID: 30538672).
PE(22:1(13Z)/15:0) is a phosphatidylethanolamine (PE or GPEtn). It is a glycerophospholipid in which a phosphorylethanolamine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphoethanolamines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PE(22:1(13Z)/15:0), in particular, consists of one chain of erucic acid at the C-1 position and one chain of pentadecanoic acid at the C-2 position. The erucic acid moiety is derived from seed oils and avocados, while the pentadecanoic acid moiety is derived from dairy products and milk fat. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PEs are neutral zwitterions at physiological pH. They mostly have palmitic or stearic acid on carbon 1 and a long chain unsaturated fatty acid (e.g. 18:2, 20:4 and 22:6) on carbon 2. PE synthesis can occur via two pathways. The first requires that ethanolamine be activated by phosphorylation and then coupled to CDP. The ethanolamine is then transferred from CDP-ethanolamine to phosphatidic acid to yield PE. The second involves the decarboxylation of PS.
PC(22:4(7Z,10Z,13Z,16Z)/14:0) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(22:4(7Z,10Z,13Z,16Z)/14:0), in particular, consists of one chain of adrenic acid at the C-1 position and one chain of myristic acid at the C-2 position. The adrenic acid moiety is derived from animal fats, while the myristic acid moiety is derived from nutmeg and butter. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
(Methylthio)acetone is found in animal foods. (Methylthio)acetone is present in roasted sesame seed oil, cooked beef liver and acid hydrolysed soy protein. (Methylthio)acetone is a flavouring agent.
Sphinganine belongs to the class of organic compounds known as 1,2-aminoalcohols. These are organic compounds containing an alkyl chain with an amine group bound to the C1 atom and an alcohol group bound to the C2 atom. Thus, sphinganine is considered to be a sphingoid base lipid molecule. Sphinganine is a very hydrophobic molecule, practically insoluble (in water), and relatively neutral. Sphinganine exists in all living species, ranging from bacteria to humans. Within humans, sphinganine participates in a number of enzymatic reactions. In particular, sphinganine can be converted into 3-dehydrosphinganine through its interaction with the enzyme 3-ketodihydrosphingosine reductase. In addition, sphinganine can be converted into sphinganine 1-phosphate; which is catalyzed by the enzyme sphingosine kinase 2. Outside of the human body, sphinganine has been detected, but not quantified in, several different foods, such as Mexican oregano, jostaberries, winter squash, angelica, and epazotes. This could make sphinganine a potential biomarker for the consumption of these foods. Sphinganine blocks postlysosomal cholesterol transport by inhibiting low-density lipoprotein-induced esterification of cholesterol and causing unesterified cholesterol to accumulate in perinuclear vesicles. It has been suggested that endogenous sphinganine may inhibit cholesterol transport in Niemann-Pick Type C (NPC) disease (PMID: 1817037).
Acetoxyacetone is found in pineapple. Acetoxyacetone is a maillard produc
Phytosphingosine is a phospholipid. Phospholipids are a class of lipids and a major component of all biological membranes; sphingolipid metabolites, such as sphingosine and ceramide, are highly bioactive compounds and are involved in diverse cell processes, including cell-cell interaction, cell proliferation, differentiation, and apoptosis. Phytosphingosine is also one of the most widely distributed natural sphingoid bases, which is abundant in fungi and plants, and also found in animals including humans. Phytosphingosine is structurally similar to sphingosine; phytosphingosine possesses a hydroxyl group at C-4 of the sphingoid long-chain base. The physiological roles of phytosphingosine are largely unknown. Phytosphingosine induces apoptosis in human T-cell lymphoma and non-small cell lung cancer cells, and induces caspase-independent cytochrome c release from mitochondria. In the presence of caspase inhibitors, phytosphingosine-induced apoptosis is almost completely suppressed, suggesting that phytosphingosine-induced apoptosis is largely dependent on caspase activities. (PMID: 12576463, 12531554, 8046331, 8048941,8706124).
LysoPC(22:5(7Z,10Z,13Z,16Z,19Z)) is a lysophospholipid (LyP). It is a monoglycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. Lysophosphatidylcholines can have different combinations of fatty acids of varying lengths and saturation attached at the C-1 (sn-1) position. Fatty acids containing 16, 18 and 20 carbons are the most common. LysoPC(22:5(7Z,10Z,13Z,16Z,19Z)), in particular, consists of one chain of docosapentaenoic acid at the C-1 position. The docosapentaenoic acid moiety is derived from fish oils. Lysophosphatidylcholine is found in small amounts in most tissues. It is formed by hydrolysis of phosphatidylcholine by the enzyme phospholipase A2, as part of the de-acylation/re-acylation cycle that controls its overall molecular species composition. It can also be formed inadvertently during extraction of lipids from tissues if the phospholipase is activated by careless handling. In blood plasma significant amounts of lysophosphatidylcholine are formed by a specific enzyme system, lecithin:cholesterol acyltransferase (LCAT), which is secreted from the liver. The enzyme catalyzes the transfer of the fatty acids of position sn-2 of phosphatidylcholine to the free cholesterol in plasma, with formation of cholesterol esters and lysophosphatidylcholine. Lysophospholipids have a role in lipid signaling by acting on lysophospholipid receptors (LPL-R). LPL-R's are members of the G protein-coupled receptor family of integral membrane proteins.
Coprocholic acid, also called 3α,7α,12α-Trihydroxy-5β-cholestan-26-oic acid, is a bile acid. Bile acids are steroid acids found predominantly in the bile of mammals. The distinction between different bile acids is minute, depending only on the presence or absence of hydroxyl groups on positions 3, 7, and 12. Bile acids are physiological detergents that facilitate excretion, absorption, and transport of fats and sterols in the intestine and liver. Bile acids are also steroidal amphipathic molecules derived from the catabolism of cholesterol. They modulate bile flow and lipid secretion, are essential for the absorption of dietary fats and vitamins, and have been implicated in the regulation of all the key enzymes involved in cholesterol homeostasis. Bile acids recirculate through the liver, bile ducts, small intestine, and the portal vein to form an enterohepatic circuit. They exist as anions at physiological pH, and consequently require a carrier for transport across the membranes of the enterohepatic tissues. The unique detergent properties of bile acids are essential for the digestion and intestinal absorption of hydrophobic nutrients. Bile acids have potent toxic properties (e.g. membrane disruption) and there are a plethora of mechanisms to limit their accumulation in blood and tissues (PMID: 11316487, 16037564, 12576301, 11907135).
Fructose 6-phosphate (F6P) belongs to the class of organic compounds known as hexose phosphates. These are carbohydrate derivatives containing a hexose substituted by one or more phosphate groups. F6P is a derivative of fructose, which has been phosphorylated at the 6-hydroxy group. Fructose 6-phosphate is a fundamental metabolite and exists in all living species, ranging from bacteria to plants to humans. The great majority of glucose is converted to fructose 6-phosphate as part of the glycolytic metabolic pathway (glycolysis). Specifically, F6P is produce is produced by the isomerisation of glucose 6-phosphate via the enzyme phosphoglucose isomerase. F6P is in turn further phosphorylated to fructose-1,6-bisphosphate by the enzyme phosphofructokinase-1. Glycolysis is the metabolic pathway that converts glucose into pyruvic acid. The free energy released in this process is used to form ATP and reduced nicotinamide adenine dinucleotide (NADH). In addition to its key involvement in glycolysis, fructose 6-phosphate can also be biosynthesized from glucosamine 6-phosphate via the enzyme glucosamine-6-phosphate isomerase 1. In addition, fructose 6-phosphate and L-glutamine can be converted into glucosamine 6-phosphate and L-glutamic acid through the action of the enzyme glutamine--fructose-6-phosphate aminotransferase.
Homovanillic acid sulfate is a component of olive oil and is a major catecholamine metabolite. It is used as a reagent to detect oxidative enzymes and is associated with dopamine levels in the brain. In psychiatry and neuroscience, brain and cerebrospinal fluid levels of homovanillic acid (HVA) are measured as a marker of metabolic stress caused by 2-deoxy-D-glucose. HVA presence supports a diagnosis of neuroblastoma and malignant pheochromocytoma (Wikipedia). Homovanillic acid sulfate is an endogenous phenolic acid metabolite detected after the consumption of whole grain.
Increases in plasma dopamine sulfate and urinary dopamine suggest that dopamine sulfate may be generated via DOPA sulfate and urinary dopamine may originate from circulating DOPA. DOPA sulfate may be an alternative source of dopamine sulfate. Urinary dopamine progressively increased in the course of metyrosine treatment, and this, along with the increase of the dopamine metabolite, dihydroxyphenylethanol, and plasma dopamine sulfate, occurred in the absence of any change in plasma dopamine.(PMID: 1969915).
1-Methylguanosine is a methylated nucleoside. It is known that some modified, especially methylated, nucleosides originating from RNA degradation are excreted in abnormal levels in the urine of patients with malignant tumours. These nucleosides have been proposed as tumour markers. Their measurement could provide a non-invasive diagnostic method, help identify different cancers, and monitor any therapeutic effects (PMID:9129323).
Auxin a is found in cereals and cereal products. Claimed to have been isolated from peanut oil and corn oil.
(3beta,5alpha,6beta,25S)-3,6-Dihydroxyspirostan-12-one is found in onion-family vegetables. (3beta,5alpha,6beta,25S)-3,6-Dihydroxyspirostan-12-one is a constituent of Allium porrum (leek)
Pristanic acid (2,6,10,14-tetramethylpentadecanoic acid) is a terpenoid acid present at micromolar concentrations in the plasma of healthy individuals. It is also found in the lipids from many sources such as freshwater sponges, krill, earthworms, whales, human milk fat, bovine depot fat, butterfat or Californian petroleum. It is usually present in combination with phytanic acid. In humans, pristanic acid is obtained from two sources: either directly from the diet or as the alpha oxidation product of phytanic acid. At physiological concentrations pristanic acid is a natural ligand for PPARalpha. In liver, pristanic acid is degraded by peroxisomal beta oxidation to propionyl-CoA. Together with phytanic acid, pristanic acid accumulates in several inherited disorders such as Zellweger syndrome. Pristanic acid is a branched chain fatty acid that arises from the breakdown of phytanic acid. It is present at micromolar concentrations in the plasma of healthy individuals. Pristanic acid is normally degraded by peroxisomal beta-oxidation. In patients affected with generalized peroxisomal disorders, degradation of both phytanic acid and pristanic acid is impaired owing to absence of functional peroxisomes. Pristanic acid has been found to activate the peroxisome proliferator-activated receptor {alpha} (PPAR{alpha}) in a concentration dependent manner.
Mannosyl-diinositol-phosphorylceramide is involved in sphingolipid metabolism. Mannosyl-inositol-phosphorylceramide reacts with inositol phosphate to produce mannosyl-diinositol-phosphorylceramide and H2O.
Propiomazine, an atypical antipsychotic agent, is used to treat both negative and positive symptoms of schizophrenia, acute mania with bipolar disorder, agitation, and psychotic symptoms in dementia. Future uses may include the treatment of obsessive-compulsive disorder and severe behavioral disorders in autism. Structurally and pharmacologically similar to clozapine, propiomazine binds to alpha(1), dopamine, histamine H1, muscarinic, and serotonin type 2 (5-HT2) receptors.
Taurodeoxycholic acid is a bile salt formed in the liver by conjugation of deoxycholate with taurine, usually as the sodium salt. Bile acids are steroid acids found predominantly in the bile of mammals. The distinction between different bile acids is minute, depending only on the presence or absence of hydroxyl groups on positions 3, 7, and 12. Bile acids are physiological detergents that facilitate excretion, absorption, and transport of fats and sterols in the intestine and liver. Bile acids are also steroidal amphipathic molecules derived from the catabolism of cholesterol. They modulate bile flow and lipid secretion, are essential for the absorption of dietary fats and vitamins, and have been implicated in the regulation of all the key enzymes involved in cholesterol homeostasis. Bile acids recirculate through the liver, bile ducts, small intestine and portal vein to form an enterohepatic circuit. They exist as anions at physiological pH and, consequently, require a carrier for transport across the membranes of the enterohepatic tissues. The unique detergent properties of bile acids are essential for the digestion and intestinal absorption of hydrophobic nutrients. Bile acids have potent toxic properties (e.g. membrane disruption) and there are a plethora of mechanisms to limit their accumulation in blood and tissues (PMID:11316487, 16037564, 12576301, 11907135). Taurodeoxycholic acid can be found in Escherichia (PMID:30736766).
LysoPE(0:0/16:0) is a lysophosphatidylethanolamine or a lysophospholipid. The term 'lysophospholipid' (LPL) refers to any phospholipid that is missing one of its two O-acyl chains. Thus, LPLs have a free alcohol in either the sn-1 or sn-2 position. The prefix 'lyso-' comes from the fact that lysophospholipids were originally found to be hemolytic however it is now used to refer generally to phospholipids missing an acyl chain. LPLs are usually the result of phospholipase A-type enzymatic activity on regular phospholipids such as phosphatidylcholine or phosphatidic acid, although they can also be generated by the acylation of glycerophospholipids or the phosphorylation of monoacylglycerols. Some LPLs serve important signaling functions such as lysophosphatidic acid. Lysophosphatidylethanolamines (LPEs) can function as plant growth regulators with several diverse uses. (LPEs) are approved for outdoor agricultural use to accelerate ripening and improve the quality of fresh produce. They are also approved for indoor use to preserve stored crops and commercial cut flowers. As a breakdown product of phosphatidylethanolamine (PE), LPE is present in cells of all organisms.
3beta-Hydroxypregn-5-en-20-one sulfate is a metabolite of pregnenolone. Pregnenolone, also known as 3α,5β-tetrahydroprogesterone (3α,5β-THP), is an endogenous steroid hormone involved in the steroidogenesis of progestogens, mineralocorticoids, glucocorticoids, androgens, and estrogens, as well as the neuroactive steroids. As such it is a prohormone, though it also has biological effects of its own, behaving namely as a neuroactive steroid in its own right with potent anxiolytic effects. (Wikipedia)
LysoPE(0:0/20:2(11Z,14Z)) is a lysophosphatidylethanolamine or a lysophospholipid. The term 'lysophospholipid' (LPL) refers to any phospholipid that is missing one of its two O-acyl chains. Thus, LPLs have a free alcohol in either the sn-1 or sn-2 position. The prefix 'lyso-' comes from the fact that lysophospholipids were originally found to be hemolytic however it is now used to refer generally to phospholipids missing an acyl chain. LPLs are usually the result of phospholipase A-type enzymatic activity on regular phospholipids such as phosphatidylcholine or phosphatidic acid, although they can also be generated by the acylation of glycerophospholipids or the phosphorylation of monoacylglycerols. Some LPLs serve important signaling functions such as lysophosphatidic acid. Lysophosphatidylethanolamines (LPEs) can function as plant growth regulators with several diverse uses. (LPEs) are approved for outdoor agricultural use to accelerate ripening and improve the quality of fresh produce. They are also approved for indoor use to preserve stored crops and commercial cut flowers. As a breakdown product of phosphatidylethanolamine (PE), LPE is present in cells of all organisms.
Melilotocarpan B is found in herbs and spices. Melilotocarpan B is isolated from Melilotus alba (white melilot
O-Desmethylcarvedilol is only found in individuals that have used or taken Carvedilol. O-Desmethylcarvedilol is a metabolite of Carvedilol. O-desmethylcarvedilol belongs to the family of Carbazoles. These are compounds containing a three ring system containing a pyrrole ring fused on either side to a benzene ring.
3,5-Dimethoxyphenol is a toxin metabolite that can be found in human consuming yew (Taxus baccata) leaves. Autopsy findings of fatal intoxication with yew are nonspecific. A presence of plant residues in the digestive tract can signalize yew intoxication. If yew decoction is consumed, plant residues are not found. In such a case, the intoxication can be signalized by the presence of 3,5-dimethoxyphenol in biological material (PMID: 20942244).
Matairesinol belongs to the class of organic compounds known as dibenzylbutyrolactone lignans. These are lignan compounds containing a 3,4-dibenzyloxolan-2-one moiety. Matairesinol is an extremely weak basic (essentially neutral) compound (based on its pKa). Outside of the human body, matairesinol is found, on average, in the highest concentration in a few different foods such as sesame, burdocks, and flaxseeds, and in a lower concentration in oats, asparagus, and poppies. Matairesinol has also been detected, but not quantified in, several different foods, such as silver lindens, tamarinds, cherry tomato, skunk currants, and fireweeds. This could make matairesinol a potential biomarker for the consumption of these foods. Matairesinol is composed of gamma-butyrolactone in which the 3 and 4 positions are substituted by 4-hydroxy-3-methoxybenzyl groups (the 3R,4R-diastereomer).
Enzymes containing PQQ are called quinoproteins. PQQ and quinoproteins play a role in the redox metabolism and structural integrity of cells and tissues [PMID:2558842]. It was reported that aminoadipate semialdehyde dehydrogenase (AASDH) might also use PQQ as a cofactor, suggesting a possibility that PQQ is a vitamin in mammals. [PMID:12712191].
Tuberculostearic acid is the characteristic fatty acid of acid-fast bacteria of the order Actinomycetales. (PMID 3329256). Tuberculostearic acid (TBSA) is a mycobacterial cell wall constituent that is possible to measure in plasma samples of patients with active tuberculosis. (PMID 14723350). Detection of tuberculostearic acid in cerebrospinal fluid by use of gas chromatography-mass spectrometry has proven to be a very rapid, sensitive, and specific test for tuberculous meningitis. (PMID 8438134). Tuberculostearic acid can also be found in Actinomycetales (PMID: 109465).
Cysteine-derived Maillard product with a meaty, roasty aroma.
2-Hydroxycarbamazepine is a metabolite of carbamazepine. Carbamazepine (CBZ) is an anticonvulsant and mood-stabilizing drug used primarily in the treatment of epilepsy and bipolar disorder, as well as trigeminal neuralgia. (Wikipedia)
(+)-(1R,2R)-1,2-Diphenylethane-1,2-diol is converted from cis-stilbene oxide via the enzyme microsomal epoxide hydrolase (EC 3.3.2.9). This is a key hepatic enzyme that is involved in the metabolism of numerous xenobiotics, such as 1,3-butadiene oxide, styrene oxide and the polycyclic aromatic hydrocarbon benzo[a]pyrene 4,5-oxide.
1-Hydroxyepiacorone is found in herbs and spices. 1-Hydroxyepiacorone is a constituent of Acorus calamus (sweet flag)
3,5-Di-tert-butyl-4-hydroxybenzoic acid, also known as BHT-COOH or 4-carboxy-2,6-di-tert-butylphenol, belongs to the class of organic compounds known as hydroxybenzoic acid derivatives. Hydroxybenzoic acid derivatives are compounds containing a hydroxybenzoic acid (or a derivative), which is a benzene ring bearing a carboxyl and a hydroxyl groups. BHT-COOH is a metabolite of 2,6-di-tert-butyl-4-methylphenol (BHA), a synthetic phenolic antioxidant (SPA). SPAs are a family of chemicals used widely in foods, polymers, and cosmetics as radical trapping agents to slow down degradation due to oxidation. Given their widespread use, human exposure is unavoidable and there is public concern regarding environmental contamination by these chemicals. BHT-OH was detected in human urine (PMID: 31265952).
15beta-Hydroxydesogestrel is a metabolite of desogestrel. Desogestrel is a molecule used in hormonal contraceptives. Most combined oral contraceptive pills (COCPs, or simply OCs) on the market today contain both an estrogen compound (ethinyl estradiol is common) plus a progestin (a progesterone-like compound) such as desogestrel. Desogestrel-containing birth control pills are sometimes referred to as 'third generation' oral contraceptives. In contrast, birth control pills that are considered 'second generation' (Tri-Levlen, for example) contain an estrogen and a progestin, but the progestin is different, such as levonorgestrel. (Wikipedia)
Isradipine belongs to the dihydropyridine (DHP) class of calcium channel blockers (CCBs), the most widely used class of CCBs. It is structurally related to felodipine, nifedipine, and nimodipine and is the most potent calcium-channel blocking agent of the DHP class. Isradipine binds to calcium channels with high affinity and specificity and inhibits calcium flux into cardiac and arterial smooth muscle cells. It exhibits greater selectivity towards arterial smooth muscle cells owing to alternative splicing of the alpha-1 subunit of the channel and increased prevalence of inactive channels in smooth muscle cells. Isradipine may be used to treat mild to moderate essential hypertension.
pH control agent. One of the least bitter-tasting salts available; finds wide used in the food industry. Potassium lactate is a compound with formula KC3H5O3. It is the potassium salt of lactic acid. It is produced by neutralizing lactic acid which is fermented from a sugar source. It has E number "E326". Potassium lactate is a liquid product that is usually 60% solids but is available at up to 78% solids.
Desmethylnortriptyline is a metabolite of Amitriptyline. Amitriptyline, nortriptyline and their metabolites, desmethylnortriptyline, cis and trans 10-hydroxyamitriptyline, cis and trans 10-hydroxynortriptyline and amitriptyline-N-oxide, have been tested for inhibitory effect on the uptake of serotonin. All the metabolites are less anticholinergic than amitriptyline and nortriptyline. (PMID: 7395525)
Preservative and sequestrant in foods. Ethylenediaminetetraacetic acid, widely abbreviated as EDTA, is a polyamino carboxylic acid and a colourless, water-soluble solid. Its conjugate base is named ethylenediaminetetraacetate. It is widely used to dissolve limescale. Its usefulness arises because of its role as a hexadentate (six-toothed") ligand and chelating agent
Ethyl formate, also known as areginal or ethyl methanoate, belongs to the class of organic compounds known as carboxylic acid esters. These are carboxylic acid derivatives in which the carbon atom from the carbonyl group is attached to an alkyl or an aryl moiety through an oxygen atom (forming an ester group). Ethyl formate is an alcohol, bitter, and cognac tasting compound. Ethyl formate has been detected, but not quantified, in several different foods, such as citrus, pineapples, apples, fruits, and pomes. This could make ethyl formate a potential biomarker for the consumption of these foods. It occurs naturally in the body of ants and in the stingers of bees. Ethyl formate has the characteristic smell of rum and is also partially responsible for the flavor of raspberries. The U.S. National Institute for Occupational Safety and Health (NIOSH) also considers a time-weighted average of 100 ppm over an eight-hour period as the recommended exposure limit. Ethyl formate is an ester formed when ethanol (an alcohol) reacts with formic acid (a carboxylic acid). According to the U.S Occupational Safety and Health Administration (OSHA), ethyl formate can irritate eyes, skin, mucous membranes, and the respiratory system of humans and other animals; it is also a central nervous system depressant. Ethyl formate has been identified in dust clouds in an area of the Milky Way galaxy called Sagittarius B2 and it is among 50 molecular species identified using the 30 metre IRAM radiotelescope. In industry, it is used as a solvent for cellulose nitrate, cellulose acetate, oils, and greases.
Heptabarbital is only found in individuals that have used or taken this drug. It is an intermediate or short term barbiturate used mainly for sedation and hypnosis.Heptabarbital (like all barbiturates) works by binding to the GABAA receptor at either the alpha or the beta sub unit. These are binding sites that are distinct from GABA itself and also distinct from the benzodiazepine binding site. Like benzodiazepines, barbiturates potentiate the effect of GABA at this receptor. This GABAA receptor binding decreases input resistance, depresses burst and tonic firing, especially in ventrobasal and intralaminar neurons, while at the same time increasing burst duration and mean conductance at individual chloride channels; this increases both the amplitude and decay time of inhibitory postsynaptic currents. In addition to this GABA-ergic effect, barbiturates also block the AMPA receptor, a subtype of glutamate receptor. Glutamate is the principal excitatory neurotransmitter in the mammalian CNS. Heptabarbital also appears to bind neuronal nicotinic acetylcholine receptors.
(20S,24E)-20,26-Dihydroxy-24-dammaren-3-one is found in fruits. (20S,24E)-20,26-Dihydroxy-24-dammaren-3-one is a constituent of Mangifera indica (mango).
(3Z,6Z)-3,6-Nonadien-1-ol is found in fruits. (3Z,6Z)-3,6-Nonadien-1-ol is found in melon and cucumber. (3Z,6Z)-3,6-Nonadien-1-ol is a food flavou
Santene is found in cornmint. Santene is a flavouring ingredient. Santene is a constituent  of sandalwood oil.
Anisole is a flavouring agent Anisole is a precursor to perfumes, insect pheromones, and pharmaceuticals. For example, synthetic anethole is prepared from anisole. Anisole undergoes electrophilic aromatic substitution reaction more quickly than does benzene, which in turn reacts more quickly than nitrobenzene. The methoxy group is an ortho/para directing group, which means that electrophilic substitution preferentially occurs at these three sites. The enhanced nucleophilicity of anisole vs benzene reflects the influence of the methoxy group, which renders the ring more electron-rich. The methoxy group strongly affects the pi cloud of the ring, moreso than the inductive effect of the electronegative oxygen.
Food flavour enhancer. Monosodium glutamate, also known as sodium glutamate or MSG, is the sodium salt of glutamic acid, one of the most abundant naturally occurring non-essential amino acids. It has been classified by the U.S. Food and Drug Administration as generally recognized as safe (GRAS) and by the European Union as a food additive. MSG has the HS code 29224220 and the E number E621. The glutamate of MSG confers the same umami taste of glutamate from other foods, being chemically identical. Industrial food manufacturers market and use MSG as a flavor enhancer because it balances, blends and rounds the total perception of other tastes. Trade names of monosodium glutamate include AJI-NO-MOTO¬Æ, Vetsin, and Ac'cent. [Wikipedia].
Dyphylline is only found in individuals that have used or taken this drug. It is a theophylline derivative with broncho- and vasodilator properties. It is used in the treatment of asthma, cardiac dyspnea, and bronchitis. [PubChem]The bronchodilatory action of dyphylline, as with other xanthines, is thought to be mediated through competitive inhibition of phosphodiesterase with a resulting increase in cyclic AMP producing relaxation of bronchial smooth muscle as well as antagonism of adenosine receptors.
Mirex is a chlorinated hydrocarbon that was commercialized as an insecticide and later banned because of its impact on the environment. This white crystalline odorless solid is a derivative of cyclopentadiene. It was popularized to control fire ants but by virtue of its chemical robustness and lipophilicity it was recognized as a bioaccumulative pollutant. Ironically, the spread of the red imported fire ant was actually encouraged by the use of Mirex, which also kills native ants that are highly competitive with the fire ants. The United States Environmental Protection Agency prohibited its use in 1976.
Lormetazepam (INN, or methyl-lorazepam, is a drug which is a short to intermediate acting 3-hydroxy benzodiazepine derivative. It possesses hypnotic, anxiolytic, anticonvulsant, sedative and skeletal muscle relaxant properties. Lormetazepam is considered a hypnotic benzodiazepine and is officially indicated for moderate to severe insomnia. Lormetazepam is a short-acting benzodiazepine and is sometimes used in patients who have difficulty in maintaining sleep or falling asleep. Hypnotics should only be used on a short-term basis or, in those with chronic insomnia, on an occasional basis.
1,1'-Oxybis[2,4-dibromobenzene] is classified as a Food Contaminant (code WG) in the DFC.
Azaspiracid is found in mollusks. Azaspiracid is an alkaloid from Mytilus edulis (blue mussel). Shellfish toxin.
Escitalopram is a furancarbonitrile that is one of the Serotonin uptake inhibitors used as an antidepressant. The drug is also effective in reducing ethanol uptake in alcoholics and is used in depressed patients who also suffer from tardive dyskinesia in preference to tricyclic antidepressants, which aggravate this condition; Escitalopram (Cipralex) is a medication developed by the Danish pharmaceutical company Lundbeck, that acts as a selective serotonin reuptake inhibitor (SSRI). It is typically used as an antidepressant to treat depression associated with mood disorders, although it also may be used in the treatment of body dysmorphic disorder and anxiety, including OCD. In the United States, the drug is marketed under the name Lexapro by Forest Laboratories, Inc; Escitalopram is a medication that acts as a selective serotonin reuptake inhibitor (SSRI). It is typically used as an antidepressant to treat depression associated with mood disorders, although it also may be used in the treatment of body dysmorphic disorder and anxiety, including OCD; Discontinuation from antidepressants, especially abruptly, has been known to cause certain withdrawal symptoms. One possible discontinuation symptom from Escitalopram is a type of spontaneous nerve pulse known as paresthesia or 'electric shock sensations', described by some patients as a feeling of small electric shocks, which may be accompanied by dizziness. These pulses may be short in duration, only milliseconds long, may affect any region of the body, and recur up to several times a minute, throughout all waking hours. They can be increased by physical activity, but are not solely linked to muscular activity. Other discontinuation symptoms include extreme sensitivity to loud sounds and bright lights, chills, hot flushes, cold sweats, reddening of the face, abdominal pain, weight gain and extreme mental fatigue.
Darunavir is only found in individuals that have used or taken this drug. It is a protease inhibitor used to treat HIV. It acts on the HIV aspartyl protease which the virus needs to cleave the HIV polyprotein into its functional fragments.Darunavir is a HIV protease inhibitor which prevents HIV replication by binding to the enzyme's active site, thereby preventing the dimerization and the catalytic activity of the HIV-1 protease. Darunavir selectively inhibits the cleavage of HIV encoded Gag-Pol polyproteins in virus-infected cells, which prevents the formation of mature infectious virus particles. Structual analyses suggests that the close contact that darunavir has with the main chains of the protease active site amino acids (Asp-29 and Asp-30) is an important contributing factor to its potency and wide spectrum of activity against multi-protease inhibitor resistant HIV-1 variants. Darunavir can also adapt to the changing shape of a protease enzyme because of its molecular flexibility. Darunavir is known to bind to two distinct sites on the enzyme: the active site cavity and the surface of one of the flexible flaps in the protease dimer.
Atazanavir (formerly known as BMS-232632) is an antiretroviral drug of the protease inhibitor (PI) class. Like other antiretrovirals, it is used to treat infection of human immunodeficiency virus (HIV). Atazanavir is distinguished from other PIs in that it can be given once-daily (rather than requiring multiple doses per day) and has lesser effects on the patient's lipid profile (the amounts of cholesterol and other fatty substances in the blood). Like other protease inhibitors, it is used only in combination with other HIV medications. The U.S. Food and Drug Administration (FDA) approved atazanavir on June 20, 2003. [Wikipedia]
Ezetimibe is an anti-hyperlipidemic medication which is used to lower cholesterol levels. Specifically, it appears to bind to a critical mediator of cholesterol absorption, the Niemann-Pick C1-Like 1 (NPC1L1) protein on the gastrointestinal tract epithelial cells as well as in hepatocytes.
Rosmarinic acid is an ester of caffeic acid and 3,4-dihydroxyphenyllactic acid. It is commonly found in species of the Boraginaceae and the subfamily Nepetoideae of the Lamiaceae. It is a red-orange powder that is slightly soluble in water, but well soluble is most organic solvents. Rosmarinic acid is one of the polyphenolic substances contained in culinary herbs such as perilla (Perilla frutescens L.), rosemary (Rosmarinus officinalis L.), sage (Salvia officinalis L.), mint (Mentha arvense L.), and basil (Ocimum basilicum L.). These herbs are commonly grown in the garden as kitchen herbs, and while used to add flavor in cooking, are also known to have several potent physiological effects (PMID: 12482446, 15120569). BioTransformer predicts that rosmarinic acid is a product of methylrosmarinic acid metabolism via a hydrolysis-of-carboxylic-acid-ester-pattern1 reaction occurring in humans and human gut microbiota and catalyzed by the liver carboxylesterase 1 (P23141) enzyme (PMID: 30612223).
Salvianolic acid G is a polyphenol metabolite detected in biological fluids (PMID: 20428313).
This compound belongs to the family of Phenanthrenes and Derivatives. These are polycyclic compounds containing a phenanthrene moiety, which is a tricyclic aromatic compound with three non-linearly fused benzene.
alpha-L-Rhamnopyranosyl-(1->3)-alpha-D-galactopyranosyl-(1->3)-L-fucose is found in green vegetables. alpha-L-Rhamnopyranosyl-(1->3)-alpha-D-galactopyranosyl-(1->3)-L-fucose is isolated from the partial acid hydrolysate of mucilage from the edible water plant junsai (Brasenia schreberi).
Caspofungin (brand name Cancidas worldwide) is an antifungal drug, the first of a new class termed the echinocandins from Merck & Co., Inc. It shows activity against infections with Aspergillus and Candida, and works by inhibiting (1,3)-D-Glucan of the fungal cell wall. Caspofungin is administered intravenously.
Anidulafungin or Eraxis is an anti-fungal drug manufactured by Pfizer that gained approval by the Food and Drug Administration (FDA) in February 21, 2006; it was previously known as LY303366. There is preliminary evidence that it has a similar safety profile to caspofungin. [Wikipedia]
Micafungin is only found in individuals that have used or taken this drug. It is an antifungal drug. It belongs to the antifungal class of compounds known as echinocandins.Micafungin inhibits the synthesis of beta-1,3-D-glucan, an essential component of fungal cell walls which is not present in mammalian cells. It does this by inhibiting beta-1,3-D-glucan synthase.
Ginkgolide A is found in fats and oils. Ginkgolide A is a bitter principle from Ginkgo biloba (ginkgo).
Ginkgolide B is found in fats and oils. Ginkgolide B is isolated from Ginkgo biloba (ginkgo).
Cabazitaxel is a prescription anti-cancer medicine used with the steroid medicine prednisone. Cabazitaxel is used to treat people with prostate cancer that has progressed after treatment with other anti-cancer medicines, including docetaxel. Cabazitaxel is prepared by semi-synthesis with a precursor extracted from yew needles (10-deacetylbaccatin III). It was approved by the U.S. Food and Drug Administration (FDA) on June 17, 2010.
2-Methylfuran is a flammable, water-soluble liquid with a chocolate odor, found naturally in Myrtle and Dutch Lavender used as a FEMA GRAS (Generally Recognized As Safe) flavoring substance, with the potential for use in alternative fuels.
Ethyl pyruvate, also known as pyruvic acid ethyl ester or 2-oxo-propionate ethyl ester, belongs to the family of alpha-keto acids and derivatives. These are organic compounds containing an aldehyde substituted with a keto group on the adjacent carbon. Ethyl pyruvate is soluble (in water) and an extremely weak acidic compound (based on its pKa). When given as a drug, ethyl pyruvate (known as CTI-01) inhibits the systemic release of cytokines (e.g. TNF-alpha and HMGB1), which promote the body's inflammatory response. The over-expression of these cytokines has been linked to diseases that occur in critical care settings, such as severe organ damage following cardiopulmonary bypass (CPB) and post-operative ileus following abdominal surgery (DrugBank). Ethyl pyruvate is a flavouring ingredient.
According to the Italian P.I. sheet etizolam belongs to a new class of diazepines, thienotriazolodiazepines. This new class is easily oxidized, rapidly metabolized, and has a lower risk of accumulation, even after prolonged treatment. Etizolam has an anxiolytic action about 6 times greater than that of diazepam. Etizolam produces, especially at higher dosages, a reduction in time taken to fall asleep, an increase in total sleep time and a reduction in the number of awakenings. During tests there were not substantial changes in deep sleep. There is a reduction of REM sleep. In EEG tests of healthy volunteers Etizolam showed some characteristics of tricyclic antidepressants. Etizolam (marketed under the brand name Etilaam, Etizola, Sedekopan, Pasaden or Depas) is a thienodiazepine drug which is a benzodiazepine analog. The etizolam molecule differs from a benzodiazepine in that the benzene ring has been replaced by a thiophene ring. It possesses amnesic, anxiolytic, anticonvulsant, hypnotic, sedative and skeletal muscle relaxant properties.
Amentoflavone is found in fruits. Amentoflavone is obtained from Viburnum prunifolium (black haw
Anthraquinone derivative, a stereoisomer of sennidin A, stimulates glucose incoporation into adipocytes in rats, but the activity of sennidin B is lower than sennidin A.
5,7-Dihydroxyflavone is found in carrot. Chrysin is a naturally occurring flavone chemically extracted from the blue passion flower (Passiflora caerulea). Honeycomb also contains small amounts. It is also reported in Oroxylum indicum or Indian trumpetflower. (Wikipedia).
Desglucocoroloside is found in green vegetables. Desglucocoroloside is from Corchorus olitorius (Jew's mallow).
Sitagliptin is a new oral hypoglycemic (anti-diabetic drug) of the new dipeptidyl peptidase-4 (DPP-4) inhibitor class of drugs. This enzyme-inhibiting drug is to be used either alone or in combination with metformin or a thiazolidinedione for control of type 2 diabetes mellitus. The drug works to competitively inhibit a protein/enzyme, dipeptidyl peptidase 4 (DPP-4), that results in an increased amount of active incretins (GLP-1 and GIP), reduced amount of release of glucagon (diminishes its release) and increased release of insulin.
1-(3,4-Dimethoxyphenyl)-4-decen-3-one is found in ginger. 1-(3,4-Dimethoxyphenyl)-4-decen-3-one is a constituent of ginger (Zingiber officinale) [DFC] (Yannai, Shmuel. (2004) Dictionary of food compounds with CD-ROM: Additives, flavors, and ingredients. Boca Raton: Chapman & Hall/CRC.).
Cis-stilbene oxide is part of the Bile secretion pathway. It is a substrate for: Epoxide hydrolase 1.
Mimosine is only found in individuals that have used or taken this drug. It is an antineoplastic alanine-substituted pyridine derivative isolated from Leucena glauca. [PubChem]Mimosine causes inhibition of DNA replication, changes in the progression of the cells in the cell cycle, and apoptosis. Mimosine appears to introduce breaks into DNA. Mimosine is an iron/zinc chelator. Iron depletion induces DNA double-strand breaks in treated cells, and activates a DNA damage response that results in focal phosphorylation of histones. This leads to inhibition of DNA replication and/or DNA elongation. Some studies indicate that mimosine prevents the initiation of DNA replication, whereas other studies indicate that mimosine disrupts elongation of the replication fork by impairing deoxyribonucleotide synthesis by inhibiting the activity of the iron-dependent enzyme ribonucleotide reductase and the transcription of the cytoplasmic serine hydroxymethyltransferase gene (SHMT). Inhibition of serine hydroxymethyltransferase is moderated by a zinc responsive unit located in front of the SHMT gene.
Red dye component of alkanet root extract used for colouring sausage casings, margarine, confectionery and wine. This extract, formerly FEMA 2016, has been removed from the FEMA GRAS (Generally Recognized As Safe) list. Not permitted in Germany. Japan approved
19-oxo-deoxycorticosterone (19-oxo-DOC) is a steroid recently isolated from the rat adrenal gland.19-Oxo-Deoxycorticosterone Binds to the Renal Mineralocorticoid Receptor and Produces Sodium Retention but Not Potassium Excretion.19-oxo-DOC both binds to type I renal mineralocor-ticoid receptors and produces the expected antinatriuretic effect of maximal doses of mineralocorticoids. This lack of a kaliuretic effect suggests that either 1) the kaliuretic effect of steroids such as aldosterone is mediated by a binding site other than the type I receptors, or 2) that potassium secretion mediated by aldoster-one-type I receptor interactions in discrete nephron target segments can be influenced by a steroid-sensitive potassium-recycling system in a more distal nephron site. 19-hydroxydeoxycorticosterone (19,21-dihydroxy-4-pregnen-3,20-dione), 19-oxo-deoxycorticosterone (21-hydroxy-4-pregnen-3,19,20-trione), and 19-oic-deoxycorticosterone (19-oic-21-hydroxy-4-pregnen-3,20-dione)are formed from precursor deoxycorticosterone by adrenal glands obtained from intact rats and from rats undergoing adrenal regeneration.rat adrenals have the enzymes required to convert deoxycorticosterone to 19-hydroxydeoxycorticosterone, 19-oxo-deoxycorticosterone, and 19-oic-deoxycorticosterone; however, rat adrenals do not convert deoxycorticosterone or any of the oxygenated metabolites to 19-nor-deoxycorticosterone (21-hydroxy-19-nor-4-pregnen-3,20-dione). It is possible, however, that 19-nor-deoxycorticosterone is formed at peripheral sites from the oxygenated deoxycorticosterone precursors.
Deferasirox is an oral iron chelator. Its main use is to reduce chronic iron overload in patients who are receiving long term blood transfusions for conditions such as beta-thalassemia and other chronic anemias. It is the first oral medication approved in the USA for this purpose.
Everolimus is a derivative of Rapamycin (sirolimus), and works similarly to Rapamycin as an mTOR (mammalian target of rapamycin) inhibitor. It is currently used as an immunosuppressant to prevent rejection of organ transplants. In a similar fashion to other mTOR inhibitors Everolimus' effect is solely on the mTORC1 protein and not on the mTORC2 protein.
Efavirenz (brand names Sustiva and Stocrin) is a non-nucleoside reverse transcriptase inhibitor (NNRTI) and is used as part of highly active antiretroviral therapy (HAART) for the treatment of a human immunodeficiency virus (HIV) type 1.
3-Hydroxyglutaric acid is a member of the class of compounds known as dicarboxylic acids and derivatives. These are organic compounds containing exactly two carboxylic acid groups. 3-Hydroxyglutaric acid is soluble (in water) and a weakly acidic compound (based on its pKa). When present in sufficiently high levels, 3-hydroxyglutaric acid can act as an acidogen and a metabotoxin. An acidogen is an acidic compound that induces acidosis, which has multiple adverse effects on many organ systems. A metabotoxin is an endogenously produced metabolite that causes adverse health effects at chronically high levels. Chronically high levels of 3-hydroxyglutaric acid are associated with glutaric aciduria type I (glutaric acidemia type I, glutaryl-CoA dehydrogenase deficiency, GA1, or GAT1). GA1 is an inherited disorder in which the body is unable to completely break down the amino acids lysine, hydroxylysine, and tryptophan due to a deficiency of mitochondrial glutaryl-CoA dehydrogenase (EC 1.3.99.7, GCDH). Excessive levels of their intermediate breakdown products (e.g. glutaric acid, glutaryl-CoA, 3-hydroxyglutaric acid, glutaconic acid) can accumulate and cause damage to the brain (and also other organs), but particularly the basal ganglia. GA1 is associated with a risk for intracranial and retinal hemorrhage, and non-specific white matter changes. Babies with glutaric acidemia type I are often born with unusually large heads (macrocephaly). Other symptoms include spasticity (increased muscle tone/stiffness) and dystonia (involuntary muscle contractions resulting in abnormal movement or posture), but many affected individuals are asymptomatic. Seizures and coma (encephalopathy) are rare. GA1 also causes secondary carnitine deficiency because 3-hydroxyglutaric acid, like other organic acids, is detoxified by carnitine.
Lapatinib is an anti-cancer drug developed by GlaxoSmithKline (GSK) as a treatment for solid tumours such as breast and lung cancer. It was approved by the FDA on March 13, 2007, for use in patients with advanced metastatic breast cancer in conjunction with the chemotherapy drug Capecitabine. Lapatinib is human epidermal growth factor receptor type 2 (HER2/ERBB2) and epidermal growth factor receptor (HER1/EGFR/ERBB1) tyrosine kinases inhibitor. It binds to the intracellular phosphorylation domain to prevent receptor autophosphorylation upon ligand binding.
The prototypical phenothiazine antipsychotic drug. Like the other drugs in this class, chlorpromazine's antipsychotic actions are thought to be due to long-term adaptation by the brain to blocking dopamine receptors. Chlorpromazine has several other actions and therapeutic uses, including as an antiemetic and in the treatment of intractable hiccup. [PubChem]
Linezolid is only found in individuals that have used or taken this drug. It is a synthetic antibiotic, the first of the oxazolidinone class, used for the treatment of infections caused by multi-resistant bacteria including streptococcus and methicillin-resistant Staphylococcus aureus (MRSA). Linezolid is a synthetic antibacterial agent of the oxazolidinone class of antibiotics. It has in vitro activity against aerobic Gram positive bacteria, certain Gram negative bacteria and anaerobic microorganisms. It selectively inhibits bacterial protein synthesis through binding to sites on the bacterial ribosome and prevents the formation of a functional 70S-initiation complex. Specifically, linezolid binds to a site on the bacterial 23S ribosomal RNA of the 50S subunit and prevents the formation of a functional 70S initiation complex, which is an essential component of the bacterial translation process. The results of time-kill studies have shown linezolid to be bacteriostatic against enterococci and staphylococci. For streptococci, linezolid was found to be bactericidal for the majority of strains. Linezolid is also a reversible, nonselective inhibitor of monoamine oxidase. Therefore, linezolid has the potential for interaction with adrenergic and serotonergic agents.
Telbivudine is only found in individuals that have used or taken this drug. It is a synthetic thymidine nucleoside analog with specific activity against the hepatitis B virus. Telbivudine is orally administered, with good tolerance, lack of toxicity and no dose-limiting side effects.Telbivudine 5'â€“triphosphate inhibits HBV DNA polymerase (reverse transcriptase) by competing with the natural substrate, thymidine 5'â€“triphosphate. This leads to the chain termination of DNA synthesis, thereby inhibiting viral replication. Incorporation of telbivudine 5'â€“triphosphate into viral DNA also causes DNA chain termination, resulting in inhibition of HBV replication. Telbivudine inhibits anticompliment or second-strand DNA.
Entecavir is an oral antiviral drug used in the treatment of hepatitis B infection. It is marketed under the trade name Baraclude (BMS). Entecavir is a guanine analogue that inhibits all three steps in the viral replication process, and the manufacturer claims that it is more efficacious than previous agents used to treat hepatitis B (lamivudine and adefovir). It was approved by the U.S. Food and Drug Administration (FDA) in March 2005.
Glycerol 2-(9Z,12Z-octadecadienoate) 1-hexadecanoate 3-O-[alpha-D-galactopyranosyl-(1->6)-beta-D-galactopyranoside] is found in cereals and cereal products. Glycerol 2-(9Z,12Z-octadecadienoate) 1-hexadecanoate 3-O-[alpha-D-galactopyranosyl-(1->6)-beta-D-galactopyranoside] is a constituent of wheat flour.
Chrysophanol is found in dock. Chrysophanol is a constituent of Rumex, Rheum species
The phytoestrogen biochanin A is an isoflavone derivative isolated from red clover Trifolium pratense with anticarcinogenic properties. Treating MCF-7 human breast carcinoma cells with biochanin A alone caused the accumulation of CYP1A1 mRNA and an increase in CYP1A1-specific 7-ethoxyresorufin O-deethylase (EROD) activity in a dose dependent manner. Biochanin A may be a natural ligand to bind on aryl hydrocarbon receptor acting as an antagonist/agonist of the pathway. (PMID: 16903077). Biochanin A suppress nuclear factor-kappaB-driven interleukin-6 (IL6) expression. In addition to its physiologic immune function as an acute stress cytokine, sustained elevated expression levels of IL6 promote chronic inflammatory disorders, aging frailty, and tumorigenesis. (PMID: 16651441). Biochanin A induces a decrease in invasive activity of U87MG cells in a dose-related manner. (PMID: 16598420). Biochanin A activates peroxisome proliferator-activated receptors (PPAR) PPARalpha, PPARgamma, and adipocyte differentiation in vitro of 3T3-L1 preadipocytes, suggesting potential value of isoflavones, especially biochanin A and their parent botanicals, as antidiabetic agents and for use in regulating lipid metabolism. (PMID: 16549448).
Pyrrobutamine is an H1-antihistamine.
The phytoestrogen biochanin A is an isoflavone derivative isolated from red clover Trifolium pratense with anticarcinogenic properties. Treating MCF-7 human breast carcinoma cells with biochanin A alone caused the accumulation of CYP1A1 mRNA and an increase in CYP1A1-specific 7-ethoxyresorufin O-deethylase (EROD) activity in a dose dependent manner. Biochanin A may be a natural ligand to bind on aryl hydrocarbon receptor acting as an antagonist/agonist of the pathway. (PMID: 16903077). Biochanin A suppress nuclear factor-kappaB-driven interleukin-6 (IL6) expression. In addition to its physiologic immune function as an acute stress cytokine, sustained elevated expression levels of IL6 promote chronic inflammatory disorders, aging frailty, and tumorigenesis. (PMID: 16651441). Biochanin A induces a decrease in invasive activity of U87MG cells in a dose-related manner. (PMID: 16598420). Biochanin A activates peroxisome proliferator-activated receptors (PPAR) PPARalpha, PPARgamma, and adipocyte differentiation in vitro of 3T3-L1 preadipocytes, suggesting potential value of isoflavones, especially biochanin A and their parent botanicals, as antidiabetic agents and for use in regulating lipid metabolism. (PMID: 16549448).
2,3,5-Trimethylfuran is found in coffee and coffee products. 2,3,5-Trimethylfuran is organoleptic compound occurring in coffee arom
Vitexin, also known as apigenin 8-C-glucoside or 8-glycosylapigenin, belongs to the class of organic compounds known as flavonoid 8-C-glycosides. Flavonoid 8-C-glycosides are compounds containing a carbohydrate moiety which is C-glycosidically linked to 8-position of a 2-phenylchromen-4-one flavonoid backbone. Vitexin is also described as an apigenin flavone glucoside. Vitexin has been found in passion flower, chasteberry, bamboo leaves, millet and Hawthorn. Vitexin has shown a wide range of pharmacological effects, such as antioxidant, anti-cancer, anti-inflammatory, anti-hyperalgesic, and neuroprotective effects (PMID: 27693342). Vitexin has also been shown to directly inhibit thyroid peroxidase and potentially contributes to goiter (PMID: 1696490). It is sometimes called a goitrogen.
Phytoene, also known as 7,7',8,8',11,11',12,12'-octahydrocarotene, is a carotenoid found in human fluids. Carotenoids are isoprenoid molecules that are widespread in nature and are typically seen as pigments in fruits, flowers, birds, and crustacea. Animals are unable to synthesize carotenoids de novo, and rely upon the diet as a source of these compounds. Over recent years there has been considerable interest in dietary carotenoids with respect to their potential in alleviating age-related diseases in humans. This attention has been mirrored by significant advances in cloning most of the carotenoid genes and in the genetic manipulation of crop plants with the intention of increasing levels in the diet. Studies have shown an inverse relationship between the consumption of certain fruits and vegetables and the risk of epithelial cancer. Since carotenoids are among the micronutrients found in cancer-preventive foods, detailed qualitative and quantitative determination of these compounds, particularly in fruits and vegetables and in human plasma, have recently become increasingly important (PMID: 1416048, 15003396).
Posaconazole is only found in individuals that have used or taken this drug. It is a triazole antifungal drug that is used to treat invasive infections by Candida species and Aspergillus species in severely immunocompromised patients.As a triazole antifungal agent, posaconazole exerts its antifungal activity through blockage of the cytochrome P-450 dependent enzyme, sterol 14alpha-demethylase, in fungi by binding to the heme cofactor located on the enzyme. This leads to the inhibition of the synthesis of ergosterol, a key component of the fungal cell membrane, and accumulation of methylated sterol precursors. This results in inhibition of fungal cell growth and ultimately, cell death.
Tenofovir is only found in individuals that have used or taken this drug. Tenofovir, marketed by Gilead Sciences under the trade name Viread&reg;, belongs to a class of antiretroviral drugs known as nucleotide analogue reverse transcriptase inhibitors (nRTIs), which block reverse transcriptase, an enzyme crucial to viral production in HIV-infected people. [Wikipedia]Tenofovir inhibits the activity of HIV reverse transcriptase by competing with the natural substrate deoxyadenosine 5&rsquo;-triphosphate and, after incorporation into DNA, by DNA chain termination. Specifically, the drugs are analogues of the naturally occurring deoxynucleotides needed to synthesize the viral DNA and they compete with the natural deoxynucleotides for incorporation into the growing viral DNA chain. However, unlike the natural deoxynucleotides substrates, NRTIs and NtRTIs (nucleoside/tide reverse transcriptase inhibitors) lack a 3'-hydroxyl group on the deoxyribose moiety. As a result, following incorporation of an NRTI or an NtRTI, the next incoming deoxynucleotide cannot form the next 5'-3' phosphodiester bond needed to extend the DNA chain. Thus, when an NRTI or NtRTI is incorporated, viral DNA synthesis is halted, a process known as chain termination. All NRTIs and NtRTIs are classified as competitive substrate inhibitors.
4-Hydroxy-L-glutamic acid is an intermediate in the metabolism of gamma-hydroxyglutamic acid. Specifically, 4-hydroxy-L-glutamic acid combines with 2-oxoglutarate to produce 4-hydroxy-2-oxoglutarate and glutamate. The reaction can be described as: 4-hydroxy-L-glutamate + 2-oxoglutarate <=> 4-hydroxy-2-oxoglutarate + L-glutamate. This reaction is catalyzed by 4-hydroxyglutamate aminotransferase (PMID: 13948827).
Pemetrexed is only found in individuals that have used or taken this drug. It is a chemotherapy drug manufactured and marketed by Eli Lilly and Company. Its indications are the treatment of pleural mesothelioma as well as non-small cell lung cancer.Pemetrexed is an antifolate containing the pyrrolopyrimidine-based nucleus that exerts its antineoplastic activity by disrupting folate-dependent metabolic processes essential for cell replication. In vitro studies have shown that pemetrexed inhibits thymidylate synthase (TS), dihydrofolate reductase (DHFR), and glycinamide ribonucleotide formyltransferase (GARFT), all folate-dependent enzymes involved in the de novo biosynthesis of thymidine and purine nucleotides. Pemetrexed is transported into cells by both the reduced folate carrier and membrane folate binding protein transport systems. Once in the cell, pemetrexed is converted to polyglutamate forms by the enzyme folylpolyglutamate synthetase. The polyglutamate forms are retained in cells and are inhibitors of TS and GARFT. Polyglutamation is a time- and concentration-dependent process that occurs in tumor cells and, to a lesser extent, in normal tissues. Polyglutamated metabolites have an increased intracellular half-life resulting in prolonged drug action in malignant cells.
Vildagliptin, previously identified as LAF237, is a new oral anti-hyperglycemic agent (anti-diabetic drug) of the new dipeptidyl peptidase-4 (DPP-4) inhibitor class of drugs. Vildagliptin inhibits the inactivation of GLP-1 and GIP by DPP-4, allowing GLP-1 and GIP to potentiate the secretion of insulin in the beta cells and suppress glucaon release by the alpha cells of the islets of Langerhans in the pancreas. It is currently in clinical trials in the U.S. and has been shown to reduce hyperglycemia in type 2 diabetes mellitus. While the drug is still not approved for use in the US, it was approved in Feb 2008 by European Medicines Agency for use within the EU and is listed on the Australian PBS with certain restrictions.
Rabeprazole is a proton pump inhibitor sold (as its sodium salt) under the brand names Aciphex and Pariet (distributed by Janssen-Cilag); Rabeprazole is a proton pump inhibitor sold (as its sodium salt) and it is used in the treatment of gastric ulcers and GERD (or heartburn). It is taken once a day along with a full glass of water (preferable 30 min before breakfast).
Rosuvastatin is an antilipemic agent that competitively inhibits hydroxymethylglutaryl-coenzyme A (HMG-CoA) reductase. HMG-CoA reducuase catalyzes the conversion of HMG-CoA to mevalonic acid, the rate-limiting step in cholesterol biosynthesis. Rosuvastatin belongs to a class of medications called statins and is used to reduce plasma cholesterol levels and prevent cardiovascular disease.
Aliskiren is only found in individuals that have used or taken this drug. It is a renin inhibitor. It was approved by the U.S. Food and Drug Administration in 2007 for the treatment of hypertension.Renin is secreted by the kidney in response to decreases in blood volume and renal perfusion. Renin cleaves angiotensinogen to form the inactive decapeptide angiotensin I (Ang I). Ang I is converted to the active octapeptide angiotensin II (Ang II) by angiotensin-converting enzyme (ACE) and non-ACE pathways. Ang II is a powerful vasoconstrictor and leads to the release of catecholamines from the adrenal medulla and prejunctional nerve endings. It also promotes aldosterone secretion and sodium reabsorption. Together, these effects increase blood pressure. Ang II also inhibits renin release, thus providing a negative feedback to the system. This cycle, from renin through angiotensin to aldosterone and its associated negative feedback loop, is known as the renin-angiotensin-aldosterone system (RAAS). Aliskiren is a direct renin inhibitor, decreasing plasma renin activity (PRA) and inhibiting the conversion of angiotensinogen to Ang I. Whether aliskiren affects other RAAS components, e.g., ACE or non-ACE pathways, is not known. All agents that inhibit the RAAS, including renin inhibitors, suppress the negative feedback loop, leading to a compensatory rise in plasma renin concentration. When this rise occurs during treatment with ACE inhibitors and ARBs, the result is increased levels of PRA. During treatment with aliskiren, however, the effect of increased renin levels is blocked, so that PRA, Ang I and Ang II are all reduced, whether aliskiren is used as monotherapy or in combination with other antihypertensive agents. PRA reductions in clinical trials ranged from approximately 50%-80%, were not dose-related and did not correlate with blood pressure reductions. The clinical implications of the differences in effect on PRA are not known.
Cloxacillin is only found in individuals that have used or taken this drug. It is a semi-synthetic antibiotic that is a chlorinated derivative of oxacillin. [PubChem]By binding to specific penicillin-binding proteins (PBPs) located inside the bacterial cell wall, cloxacillin inhibits the third and last stage of bacterial cell wall synthesis. Cell lysis is then mediated by bacterial cell wall autolytic enzymes such as autolysins; it is possible that cloxacillin interferes with an autolysin inhibitor.
Thymoquinone is found in herbs and spices. Thymoquinone is a major constituent of seed oil of black cumin, Nigella sativa (24%
Rimonabant is an anorectic anti-obesity drug produced and marketed by Sanofi-Aventis. It is an inverse agonist for the cannabinoid receptor CB1. Its main avenue of effect is reduction in appetite. Rimonabant is the first selective CB1 receptor blocker to be approved for use anywhere in the world. Rimonabant is approved in 38 countries including the E.U., Mexico, and Brazil. It was rejected for approval for use in the United States. This decision was made after a U.S. advisory panel recommended the medicine not be approved because it may increase suicidal thinking and depression.
Imperatorin is found in anise. Imperatorin is present in Aegle marmelos (bael fruit) and seeds of Pastinaca sativa (parsnip).Imperatorin is a furocoumarin and a phytochemical that has been isolated from Urena lobata L. (Malvaceae). It is biosynthesized from umbelliferone, a coumarin derivative
Secoisolariciresinol is a lignan, a type of phenylpropanoids.
Secoisolariciresinol 9,9'-diglucoside is found in coffee and coffee products. Secoisolariciresinol 9,9'-diglucoside is a constituent of the seeds of flax (Linum usitatissimum)
Agomelatine is structurally closely related to melatonin. Agomelatine is a potent agonist at melatonin receptors and an antagonist at serotonin-2C (5-HT2C) receptors, tested in an animal model of depression. Agomelatine was discovered and developed by the European pharmaceutical company Servier Laboratories Ltd. Servier continue to develop the drug and conduct phase III trials in the European Union. In 2005 Servier submitted Agomelatine to the European Medicines Agency (EMEA). On 27 July 2006 the Committee for Medical Products for Human Use (CHMP) of the EMEA recommended a refusal of the marketing authorisation of Valdoxan/Thymanax. The major concern was that efficacy had not been sufficiently shown. In 2006 Servier sold the rights to develop Agomelatine in the US to Novartis. The development for the US market was discontinued in October 2011. It is currently sold in Australia under the Valdoxan trade name.
N-trans-Feruloyl-4-O-methyldopamine is found in cereals and cereal products. N-trans-Feruloyl-4-O-methyldopamine is an alkaloid from roots of the pseudocereal Chenopodium album (lambsquarters).
Olmesartan is an antihypertensive agent which belongs to the class of medicines called angiotensin II receptor antagonists. It acts rapidly to lower high blood pressure. It is marketed worldwide by Daiichi Sankyo, Ltd. and in the United States by Daiichi Sankyo, Inc. and Forest Laboratories.
p-Cresol glucuronide is a glucuronide derivative a p-Cresol that is typically excreted in the urine. P-Cresol (the precursor of p-cresol sulfate (PCS) and p-cresol glucuronide (PCG)) is mainly generated as an end product of tyrosine biotransformation by anaerobic intestinal bacteria. During passage through the colonic mucosa and liver, sulfatation and glucuronidation generates p-Cresol sulfate (as the most preponderant metabolite) and p-Cresol glucuronide (at markedly lower concentrations) (PMID: 23826225). Cresols are known as methylphenols. Cresols are used to dissolve other chemicals, such as disinfectants and deodorizers. They are also used to make specific chemicals that kill insect pests. Cresol solutions are used as household cleaners and disinfectants such as Lysol. Cresol solutions can also be found in photographic developers. In the past, cresol solutions have been used as antiseptics in surgery, but they have been largely displaced in this role by less toxic compounds. Cresols are found in many foods and in wood and tobacco smoke, crude oil, coal tar, and in brown mixtures such as creosote, cresolene and cresylic acids, which are wood preservatives. Microbes in the soil and water produce cresols when they break down materials in the environment. Most exposures to cresols are at very low levels that are not harmful. When cresols are breathed, ingested, or applied to the skin at very high levels, they can be very harmful. Effects observed in people include irritation and burning of skin, eyes, mouth, and throat; abdominal pain and vomiting. Cresols are also a chemical component found in Sharpie Markers. P-cresol is a major component in pig odor.
Nodakenetin is found in wild celery. Nodakenetin is a constituent of Angelica species
Hesperetin, also known as prestwick_908 or YSO2, belongs to the class of organic compounds known as 4'-o-methylated flavonoids. These are flavonoids with methoxy groups attached to the C4' atom of the flavonoid backbone. Thus, hesperetin is considered to be a flavonoid lipid molecule. Hesperetin also seems to upregulate the LDL receptor. Hesperetin, in the form of its glycoside , is the predominant flavonoid in lemons and oranges. Hesperetin is a drug which is used for lowering cholesterol and, possibly, otherwise favorably affecting lipids. In vitro research also suggests the possibility that hesperetin might have some anticancer effects and that it might have some anti-aromatase activity. Hesperetin is a very hydrophobic molecule, practically insoluble in water, and relatively neutral. Hesperetin is a bitter tasting compound. Hesperetin is found, on average, in the highest concentration within a few different foods, such as limes, persian limes, and sweet oranges and in a lower concentration in pummelo, welsh onions, and lemons. Hesperetin has also been detected, but not quantified, in several different foods, such as yellow bell peppers, carrots, rapinis, hazelnuts, and beers. Hesperetin is a biomarker for the consumption of citrus fruits. Hesperetin reduces or inhibits the activity of acyl-coenzyme A:cholesterol acyltransferase genes (ACAT1 and ACAT2) and it reduces microsomal triglyceride transfer protein (MTP) activity.
Glucoraphanin belongs to the class of organic compounds known as alkylglucosinolates. These are organic compounds containing a glucosinolate moiety that carries an alkyl chain. Outside of the human body, glucoraphanin has been detected, but not quantified in, several different foods, such as radish, common cabbages, Brassicas, Chinese cabbages, and cabbages. This could make glucoraphanin a potential biomarker for the consumption of these foods.
Vorinostat (rINN) or suberoylanilide hydroxamic acid (SAHA), is a drug currently under investigation for the treatment of cutaneous T cell lymphoma (CTCL), a type of skin cancer, to be used when the disease persists, gets worse, or comes back during or after treatment with other medicines. It is the first in a new class of agents known as histone deacetylase inhibitors. A recent study suggested that vorinostat also possesses some activity against recurrent glioblastoma multiforme, resulting in a median overall survival of 5.7 months (compared to 4 - 4.4 months in earlier studies). Further brain tumor trials are planned in which vorinostat will be combined with other drugs. [Wikipedia]
(S)-2,3-Epoxysqualene, also known as 2,3-oxidosqualene or (S)-squalene-2,3-epoxide, belongs to the class of organic compounds known as triterpenoids. These are terpene molecules containing six isoprene units. Thus, (S)-2,3-epoxysqualene is considered to be an isoprenoid lipid molecule. (S)-2,3-Epoxysqualene is a very hydrophobic molecule, practically insoluble (in water), and relatively neutral. (S)-2,3-Epoxysqualene is an intermediate in the biosynthesis of terpenoid. It is a substrate for squalene monooxygenase and lanosterol synthase.
Germanicol cinnamate is found in fats and oils. Germanicol cinnamate is isolated from shea butte
Melleolide is found in mushrooms. Melleolide is isolated from Armillaria mellea (honey mushroom
Ethyl 10-undecenoate is found in alcoholic beverages. Ethyl 10-undecenoate is a flavouring ingredient. Ethyl 10-undecenoate is found in rum and cogna
Sitaxentan is only found in individuals that have used or taken this drug. Sitaxentan is a competitive antagonist of endothelin-1 at the endothelin-A (ET-A) and endothelin-B (ET-B) receptors. Under normal conditions, endothelin-1 binding of ET-A or ET-B receptors causes pulmonary vasoconstriction. By blocking this interaction, Sitaxentan decreases pulmonary vascular resistance. Sitaxentan has a higher affinity for ET-A than ET-B.
Cinacalcet (INN) is a drug that acts as a calcimimetic (i.e. it mimics the action of calcium on tissues) by allosteric activation of the calcium-sensing receptor that is expressed in various human organ tissues. It is sold by Amgen under the trade name Sensipar in North America and Australia and as Mimpara in Europe. Cinacalcet is used to treat hyperparathyroidism (elevated parathyroid hormone levels), a consequence of parathyroid tumors and chronic renal failure.
Matesaponin 4 is found in tea. Matesaponin 4 is a constituent of mat leaf (Ilex paraguariensis).
Maslinic acid is a pentacyclic triterpene, found in the non-glyceride fraction of olive pomace oil (Olive pomace oil, also known as "orujo" olive oil, is a blend of refined-pomace oil and virgin olive oil, fit for human consumption). Pentacyclic triterpenes are natural compounds which are widely distributed in plants. These natural products have been demonstrated to possess anti-inflammatory properties. Triterpenoids have been reported to possess antioxidant properties, since they prevent lipid peroxidation and suppress superoxide anion generation. The triterpenes have a history of medicinal use in many Asian countries. Maslinic acid exhibits both pro- and anti-inflammatory properties depending on chemical structure and dose and may be useful in modulating the immune response; further studies are required to confirm the immunomodulatory behaviour of this triterpenoid, and characterise the mechanisms underlying the biphasic nature of some aspects of the inflammatory response. (PMID: 17292619).
(S)-MHD is a metabolite of oxcarbazepine. Oxcarbazepine (ox-kar-BAY-zih-peen) is a anticholinergic anticonvulsant and mood stabilizing drug, used primarily in the treatment of epilepsy. It is also used to treat anxiety and mood disorders, and benign motor tics. Oxcarbazepine is marketed as Trileptal by Novartis and available in some countries as a generic drug. (Wikipedia)
It is used in foods as a dough strengthener, emulsifier, stabiliser, surface active agent, formulation aid, processing aid and texturiser.
Tacrine is only found in individuals that have used or taken this drug. It is a centerally active cholinesterase inhibitor that has been used to counter the effects of muscle relaxants, as a respiratory stimulant, and in the treatment of Alzheimer's disease and other central nervous system disorders. [PubChem]The mechanism of tacrine is not fully known, but it is suggested that the drug is an anticholinesterase agent which reversibly binds with and inactivates cholinesterases. This inhibits the hydrolysis of acetylcholine released from functioning cholinergic neurons, thus leading to an accumulation of acetylcholine at cholinergic synapses. The result is a prolonged effect of acetylcholine.
Sildenafil is a drug used to treat male erectile dysfunction (impotence) and pulmonary arterial hypertension (PAH), developed by the pharmaceutical company Pfizer. It was initially studied for use in hypertension (high blood pressure) and angina pectoris (a form of ischaemic cardiovascular disease). Phase I clinical trials under the direction of Ian Osterloh suggested that the drug had little effect on angina, but that it could induce marked penile erections; Sildenafil is a potent and selective inhibitor of cGMP specific phosphodiesterase type 5 (PDE5) which is responsible for degradation of cGMP in the corpus cavernosum. The molecular structure of sildenafil is similar to that of cGMP and acts as a competitive binding agent of PDE5 in the corpus cavernosum, resulting in more cGMP and better erections. Without sexual stimulation, and therefore lack of activation of the NO/cGMP system, sildenafil should not cause an erection. Other drugs that operate by the same mechanism include tadalafil (Cialis) and vardenafil (Levitra); Sildenafil citrate, sold under the names Viagra, Revatio and generically under various other names, is a drug used to treat male erectile dysfunction (impotence) and pulmonary arterial hypertension (PAH), developed by the pharmaceutical company Pfizer. Viagra pills are blue and diamond-shaped with the words 'Pfizer' on one side, and 'VGR xx' (where xx stands for '25', '50' or '100', the dose of that pill in milligrams) on the other. Its primary competitors on the market are tadalafil (Cialis), and vardenafil (Levitra).
Sunitinib is an oral, small-molecule, multi-targeted receptor tyrosine kinase (RTK) inhibitor that was approved by the FDA for the treatment of renal cell carcinoma (RCC) and imatinib-resistant gastrointestinal stromal tumor (GIST) on January 26, 2006. Sunitinib inhibits cellular signaling by targeting multiple RTKs. These include all platelet-derived growth factor receptors (PDGF-R) and vascular endothelial growth factor receptors (VEGF-R). Sunitinib also inhibits KIT (CD117), the RTK that drives the majority of GISTs. In addition, sunitinib inhibits other RTKs including RET, CSF-1R, and flt3.
alpha-Rhamnorobin is found in alcoholic beverages. alpha-Rhamnorobin is isolated from bean Phaseolus atropurpureum, leaves of sloe (Prunus spinosa) and other
Vinaginsenoside R9 is found in tea. Vinaginsenoside R9 is a constituent of Panax vietnamensis (Vietnamese ginseng).
Notoginsenoside R1 is found in tea. Notoginsenoside R1 is a constituent of roots of Panax notoginseng (ginseng)
Notoginsenoside K is found in fruits. Notoginsenoside K is a constituent of Panax notoginseng (ginseng) and Cyclanthera pedata (achoccha)
Ginsenoside A2 is found in tea. Ginsenoside A2 is a constituent of Panax ginseng (ginseng)
3-Mercaptopyruvic acid, also known as 3-mercapto-2-oxopropanoate or beta-thiopyruvate, belongs to the class of organic compounds known as alpha-keto acids and derivatives. These are organic compounds containing an aldehyde substituted with a keto group on the adjacent carbon. 3-Mercaptopyruvic acid is an intermediate in cysteine metabolism. 3-Mercaptopyruvic acid exists in all living organisms, ranging from bacteria to humans. Within humans, 3-mercaptopyruvic acid participates in a number of enzymatic reactions. In particular, 3-mercaptopyruvic acid and cyanide can be converted into pyruvic acid and thiocyanate; which is mediated by the enzyme 3-mercaptopyruvate sulfurtransferase. In addition, 3-mercaptopyruvic acid can be biosynthesized from 3-mercaptolactic acid; which is mediated by the enzyme L-lactate dehydrogenase. It has been studied as a potential treatment for cyanide poisoning, but its half-life is too short for it to be clinically effective. In humans, 3-mercaptopyruvic acid is involved in cystinosis, ocular nonnephropathic. Outside of the human body, 3-mercaptopyruvic acid has been detected, but not quantified in several different foods, such as lima beans, spinachs, shallots, mexican groundcherries, and white lupines. This could make 3-mercaptopyruvic acid a potential biomarker for the consumption of these foods.
Sorafenib (rINN), marketed as Nexavar by Bayer, is a drug approved for the treatment of advanced renal cell carcinoma (primary kidney cancer). It has also received 'Fast Track' designation by the FDA for the treatment of advanced hepatocellular carcinoma (primary liver cancer), and has since performed well in Phase III trials. Sorafenib is a small molecular inhibitor of Raf kinase, PDGF (platelet-derived growth factor), VEGF receptor 2 & 3 kinases and c Kit the receptor for Stem cell factor. A growing number of drugs target most of these pathways. The originality of Sorafenib lays in its simultaneous targeting of the Raf/Mek/Erk pathway.
Ponatinib is a Bcr-Abl tyrosine kinase inhibitor that is especially effective against the T315I mutation for the treatment of chronic myeloid leukemia. FDA approved on December 14, 2012 (DB08901).
Dasatinib is only found in individuals that have used or taken this drug. It is an oral dual BCR/ABL and Src family tyrosine kinase inhibitor approved for use in patients with chronic myelogenous leukemia (CML). The main targets of Dasatinib, are BCRABL, SRC, Ephrins and GFR.Dasatinib, at nanomolar concentrations, inhibits the following kinases: BCR-ABL, SRC family (SRC, LCK, YES, FYN), c-KIT, EPHA2, and PDGFR&beta. Based on modeling studies, dasatinib is predicted to bind to multiple conformations of the ABL kinase. In vitro, dasatinib was active in leukemic cell lines representing variants of imatinib mesylate sensitive and resistant disease. Dasatinib inhibited the growth of chronic myeloid leukemia (CML) and acute lymphoblastic leukemia (ALL) cell lines overexpressing BCR-ABL. Under the conditions of the assays, dasatinib was able to overcome imatinib resistance resulting from BCR-ABL kinase domain mutations, activation of alternate signaling pathways involving the SRC family kinases (LYN, HCK), and multi-drug resistance gene overexpression.
(±)-Citronellal is found in herbs and spices. (±)-Citronellal is a major component (85%) of oil of the lemon-scent gum (Eucalyptus citriodora).
Rosiglitazone is an anti-diabetic drug from the thiazolidinedione class. Like other thiazolidinediones, its mechanism of action is by activation of the intracellular receptor class of the peroxisome proliferator-activated receptors (PPARs), specifically PPAR-gamma. Rosiglitazone is a pure ligand of PPAR-gamma, and has no PPAR-alpha-binding action. Apart from its effect on insulin resistance, it appears to have an anti-inflammatory effect: nuclear factor kappa-B (NF&#954;B) levels fall and inhibitor (I&#954;B) levels increase in patients on rosiglitazone (Mohanty et al). It increases glyceroneogenesis and reduces the release of free fatty acids from adipocytes; Rosiglitazone is an anti-diabetic drug from the thiazolidinedione class. It is being marketed as Avandia by the pharmaceutical company GlaxoSmithKline, both as a standalone preparation and in combination with metformin (Avandamet). Another combination drug approved by the FDA is Avandaryl (with glimepiride); Like other thiazolidinediones, its mechanism of action is by activation of the intracellular receptor class of the peroxisome proliferator-activated receptors (PPARs), specifically PPAR-gamma. Rosiglitazone is a pure ligand of PPAR-gamma, and has no PPAR-alpha binding action. Apart from its effect on insulin resistance, it appears to have an anti-inflammatory effect: nuclear factor kappa-B (NFkB) levels fall and inhibitor (IkB) levels increase in patients on rosiglitazone (Mohanty et al). It increases glyceroneogenesis and reduces the release of free fatty acids from adipocytes.
Branched fatty acid esters of hydroxy fatty acids (FAHFAs) are endogenous lipids found in adipose tissue and serum that correlate with insulin sensitivity and are reduced in insulin-resistant humans. Structurally, they are characterized by a branched ester linkage between a fatty acid and a hydroxy-fatty acid. Different positions of the branched ester on the hydroxy fatty acid results in different isomers. FAHFA(16:0/9-O-18:0), in particular, is formed from the condensation of the carboxy group of palmitic acid with the hydroxy group of 9-hydroxyoctadecanoic acid. It is alternatively named 9-PAHSA since it is the 9-hydroxy isomer of the PAHSA (palmitic acid-hydroxystearic acid) family.↵↵↵
Cymorcin monoglucoside is a constituent of the seeds of Carum copticum (ajowan)
Genipinic acid is found in beverages. Genipinic acid is isolated from the jagua fruit Genipa americana.
3,4-DHPEA-EA is found in olive. 3,4-DHPEA-EA is the major form of the oleuropein-aglycone
Vanillylmandelic acid, also known as vanillylmandelate or VMA, belongs to the class of organic compounds known as methoxyphenols. Methoxyphenols are compounds containing a methoxy group attached to the benzene ring of a phenol moiety. Vanillylmandelic acid is a sweet and vanilla tasting compound. Vanillylmandelic acid (VMA) is a chemical intermediate in the synthesis of artificial vanilla flavorings and is an end-stage metabolite of the catecholamines (dopamine, epinephrine, and norepinephrine). Vanillylmandelic acid exists in all living organisms, ranging from bacteria to plants to humans. Within humans, vanillylmandelic acid participates in a number of enzymatic reactions. In particular, vanillylmandelic acid can be biosynthesized from 3-methoxy-4-hydroxyphenylglycolaldehyde through its interaction with the enzyme aldehyde dehydrogenase. In addition, vanillylmandelic acid and pyrocatechol can be biosynthesized from 3,4-dihydroxymandelic acid and guaiacol through the action of the enzyme catechol O-methyltransferase. Urinary VMA is elevated in patients with tumors that secrete catecholamines. Urinary VMA tests may also be used to diagnose neuroblastomas, and to monitor treatment of these conditions. VMA urinalysis tests can be used to diagnose an adrenal gland tumor called pheochromocytoma, a tumor of catecholamine-secreting chromaffin cells. Vanillylmandelic acid (VMA) is produced in the liver and is a major product of norepinephrine and epinephrine metabolism excreted in the urine.
Carthamin is found in fats and oils. Red pigment of flower petals of Carthamus tinctorius (safflower) Carthamin is a natural red pigment derived from safflower (Carthamus tinctorius), earlier known as carthamine. It is used as a dye and a food coloring. As a food additive, it is known as Natural Red 26
O-Desmethyltramadol is a metabolite of tramadol. O-Desmethyltramadol (O-DSMT) is an opioid analgesic and the main active metabolite of tramadol. (+)-O-Desmethyltramadol is the most important metabolite of tramadol produced in the liver after tramadol is consumed. This metabolite is considerably more potent as a μ-opioid agonist than the parent compound (Wikipedia).
Lopinavir is only found in individuals that have used or taken this drug. It is an antiretroviral of the protease inhibitor class. It is marketed by Abbott as Kaletra, a co-formulation with a sub-therapeutic dose of ritonavir, as a component of combination therapy to treat HIV/AIDS.Lopinavir inhibits the HIV viral protease enzyme. This prevents cleavage of the gag-pol polyprotein and, therefore, improper viral assembly results. This subsequently results in non-infectious, immature viral particles.
15(R)-hydroperoxy-EPE, also known as 4-(2-HYDROXYETHYL)-1-piperazine ethanesulfonate or Hepes, is classified as a member of the N-alkylpiperazines. N-alkylpiperazines are organic compounds containing a piperazine ring where the nitrogen ring atom carries an alkyl group. 15(R)-hydroperoxy-EPE is considered to be soluble (in water) and acidic
Prothrombogenic vitamin.
Erlotinib hydrochloride (trade name Tarceva, Genentech/OSIP, originally coded as OSI-774) is a drug used to treat non-small cell lung cancer, pancreatic cancer and several other types of cancer. Similar to gefitinib, erlotinib specifically targets the epidermal growth factor receptor (EGFR) tyrosine kinase. It binds in a reversible fashion to the adenosine triphosphate (ATP) binding site of the receptor. Erlotinib has recently been shown to be a potent inhibitor of JAK2V617F activity. JAK2V617F is a mutant of tyrosine kinase JAK2, is found in most patients with polycythemia vera (PV) and a substantial proportion of patients with idiopathic myelofibrosis or essential thrombocythemia. The study suggests that erlotinib may be used for treatment of JAK2V617F-positive PV and other myeloproliferative disorders.
Glucosylsphingosine is a cytotoxic compound. Accumulation of glucosylsphingosine in brain and other tisues occurs in patients with Gaucher disease, which is an inherited deficiency of lysosomal glucocerebrosidase. Glucocerebrosidase converts glucosylsphingosine to glucose and sphingosine.
Aprepitant, an antiemetic, is a substance P/neurokinin 1 (NK1) receptor antagonist which, in combination with other antiemetic agents, is indicated for the prevention of acute and delayed nausea and vomiting associated with initial and repeat courses of highly emetogenic cancer chemotherapy. Aprepitant is a selective high-affinity antagonist of human substance P/neurokinin 1 (NK1) receptors. Aprepitant has little or no affinity for serotonin (5-HT3), dopamine, and corticosteroid receptors, the targets of existing therapies for chemotherapy-induced nausea and vomiting (CI NV).
Androstenedione is a delta-4 19-carbon steroid that is produced not only in the testis, but also in the ovary and the adrenal cortex. Depending on the tissue type, androstenedione can serve as a precursor to testosterone as well as estrone and estradiol. It is the common precursor of male and female sex hormones. Some androstenedione is also secreted into the plasma and may be converted in peripheral tissues to testosterone and estrogens. Androstenedione originates either from the conversion of dehydroepiandrosterone or from 17-hydroxyprogesterone. It is further converted to either testosterone or estrone. The production of adrenal androstenedione is governed by ACTH, while the production of gonadal androstenedione is under control by gonadotropins.
Employed in the food industry as a moisture control agent, sequestrant, texturiser, thickener, emulsifier, stabiliser, antioxidant and pH control agent. PPPi is a salt or acid that contains three phosphate groups ; ; Triphosphoric acid, also tripolyphosphoric acid, with formula H5P3O10, is a condensed form of phosphoric acid.In polyphosphoric acids, it is the next after pyrophosphoric acid, H4P2O7, also called diphosphoric acid.Compounds such as ATP (adenosine triphosphate) are esters of triphosphoric acid.; ; Polyphosphates are hydrolyzed into smaller units (orthophosphates) in the gut before absorption, which may induce a metabolic acidosis. The acute toxicity of polyphosphonates is low as the lowest LD50 after oral administration is > 1,000 mg/kg body weight.Polyphosphates are moderately irritating to skin and mucous membrane because of their alkalinity.; ; No mutagenic potential was observed when TTP was tested in a Salmonella/microsome assay (Ames test) and in a chromosomal aberration assay in vitro using a Chinese hamster fibroblast cell line (Ishidate et al. 1984). Tetrasodium pyrophosphate was not mutagenic in an in vitro assay using S. cerevisiae strains and S. typhimurium strains with and without the addition of mammalian metabolic activation preparations (IPCS 1982).; ; Reproduction studies in three generations of rats on diets with 0.5% TTP were performed. TTP had no effects on fertility or litter size, or on growth or survival on offspring (Hodge 1964). Tetrasodi
It is used in foods as a buffering agent, pH control agent, alkalinity source, dispersing agent, protein modifier, coagulant and sequestrant
Varenicline is a prescription medication used to treat smoking addiction. This medication is the first approved nicotinic receptor partial agonist. Specifically, varenicline is a partial agonist of the alpha4/beta2 subtype of the nicotinic acetylcholine receptor. In addition it acts on alpha3/beta4 and weakly on alpha3beta2 and alpha6-containing receptors. A full agonism was displayed on alpha7-receptors.
Bosutinib is a Bcr-Abl kinase inhibitor for the treatment of Philadelphia chromosome-positive (Ph+) chronic myelogenous leukemia (CML). Compared to other tyrosine kinase inhibitors, it has a more favourable hematologic toxicity profile. FDA approved on September 4, 2012 (DB06616).
Mesterolone is a synthetic anabolic androgenic steroid (AAS) with reported abuses in human sports. As for other AAS, mesterolone is also a potential doping agent in equine sports. In humans, mesterolone exhibits no inhibitory effects on hypophysial gonadotropin secretion or on spermatogenesis, unlike most androgens. Mesterolone has been used in the treatment of primary nocturnal enuresis in boys six to ten years of age. Mesterolone probably modulates the autonomic innervation of the vesical musculature with correction of the defective neural mechanism which is believed to be implicated in the pathogenesis of nocturnal enuresis. Mesterolone has been utilized in hypogonadism patients to increase total ejaculation volume and the concentration of fructose in the spermatic plasma to normal levels. Mesterolone treatment decreases cholesterol, beta-lipoproteins, fatty acid esters, free fatty acids, triglycerides and glycerol in human serum. (PMID: 4880965, 17616252, 10796496, 17636603, 2087834, 6111418, 6142498, 6386424, 7558381, 792898).
3,3',4'5-Tetrahydroxystilbene (or Piceatannol) is a phenolic stilbenoid. It is a metabolite of resveratrol found in red wine. A viral protein-tyrosine kinase (LMP2A) implicated in leukemia, non-Hodgkin's lymphoma and other diseases associated with Epstein-Barr virus, was recently found to be blocked by picetannol in vitro (PMID 2590224). Therefore there is research interest in piceatannol as an anti-cancer and anti-EBV drug. Piceatannol can also act as an agonist for estrogen receptor alpha in human breast cancer cells (PMID: 16216908).
This compound belongs to the family of Ketosteroids. These are steroid derivatives comprising a ketone group attached to steroid skeleton.
4-Methoxy-17beta-estradiol, also known as 4-methoxyestradiol or 4-ME2, is a member of the class of compounds known as estrogens and derivatives. These compounds are steroids with a structure containing a 3-hydroxylated estrane. 4-Methoxy-17beta-estradiol is practically insoluble (in water) and a very weakly acidic compound (based on its pKa). 4-Methoxy-17beta-estradiol can be synthesized from 17beta-estradiol. 4-Methoxy-17beta-estradiol can also be synthesized into 4-methoxy-17beta-estradiol 3-O-(beta-D-glucuronide).
3-methylthiopropionate is one of the metabolites of methionine (especially of D-methionine) and pharmacokinetics of 3-MTP in urine seems to contribute to the clinicopathological investigation of the liver cirrhosis. (PMID 3997054).
L-Citramalyl-CoA is an intermediate in C5-Branched dibasic acid metabolism. L-Citramalyl-CoA is the 3rd to last step in the synthesis of (R)-Acetoin and is converted from L-Citramalate via the enzyme citramalate CoA-transferase (EC 2.8.3.7). It is then converted to Pyruvate via the enzyme citramalate-CoA lyase (EC 4.1.3.25).
Itaconyl-CoA is an intermediate metabolite in the degradation pathway of itaconic acid, an unsaturated dicarbonic organic acid. Citramalyl coenzyme A (CoA) is found to be the intermediate in the conversion of itaconyl-Co-A to acetyl-CoA and pyruvate, catalyzed by methylglutaconase. Methylglutaconase catalyzes the interconversion of itaconyl-, mesaconyl-, and citramalyl-CoA. In liver mitochondria, methylglutaconase converts itaconate to pyruvate and acetyl coenzyme A. In this metabolic process, itaconate is first activated to itaconyl-CoA by a succinate activating enzyme, and a CoA derivative is cleaved to acetyl-CoA and pyruvate. (PMID: 13783048, 11548996).
N-carbamoylglutamic Acid, also known as N-Carbamoylglutamate, is classified as a glutamic acid or a Glutamic acid derivative. Glutamic acids are compounds containing glutamic acid or a derivative thereof resulting from reaction of glutamic acid at the amino group or the carboxy group, or from the replacement of any hydrogen of glycine by a heteroatom. N-carbamoylglutamic Acid is considered to be soluble (in water) and acidic
(R)-Oxypeucedanin is found in herbs and spices. (R)-Oxypeucedanin is isolated from Angelica glauc
3'-O-methyl-(-)-epicatechin is an urinary and gut-derived metabolite of epicatechin.
2,4-Dibromo-1-(4-bromophenoxy)benzene is classified as a Food Contaminant (code WG) in the DFC.
2,2',4,4',5,5'-Hexabromodiphenyl ether is classified as a Food Contaminant (code WG) in the DFC.
Celecoxib (INN) is a non-steroidal anti-inflammatory drug (NSAID) used in the treatment of osteoarthritis, rheumatoid arthritis, acute pain, painful menstruation and menstrual symptoms, and to reduce numbers of colon and rectum polyps in patients with familial adenomatous polyposis. It is marketed by Pfizer under the brand name Celebrex. In some countries, it is branded Celebra. Celecoxib is a non-steroidal anti-inflammatory drug (NSAID) used in the treatment of osteoarthritis, rheumatoid arthritis, acute pain, painful menstruation and menstrual symptoms, and to reduce numbers of colon and rectum polyps in patients with familial adenomatous polyposis. Celecoxib is a highly selective COX-2 inhibitor and primarily inhibits this isoform of cyclooxygenase, whereas traditional NSAIDs inhibit both COX-1 and COX-2. Celecoxib is approximately 10-20 times more selective for COX-2 inhibition over COX-1. In theory, this specificity allows celecoxib and other COX-2 inhibitors to reduce inflammation (and pain) while minimizing gastrointestinal adverse drug reactions (e.g. stomach ulcers) that are common with non-selective NSAIDs. It also means that it has a reduced effect on platelet aggregation compared to traditional NSAIDs; Celecoxib is a highly selective COX-2 inhibitor and primarily inhibits this isoform of cyclooxygenase, whereas traditional NSAIDs inhibit both COX-1 and COX-2. Celecoxib is approximately 10-20 times more selective for COX-2 inhibition over COX-1. In theory, this specificity allows celecoxib and other COX-2 inhibitors to reduce inflammation (and pain) while minimizing gastrointestinal adverse drug reactions (e.g. stomach ulcers) that are common with non-selective NSAIDs. It also means that it has a reduced effect on platelet aggregation compared to traditional NSAIDs.
Environmental contaminant arising from the degradation of Chlorpyrifos <ht>HHB89-F</ht> and Triclopyr <ht>DLG07-O</ht>.
This compound belongs to the family of Phenanthrenes and Derivatives. These are polycyclic compounds containing a phenanthrene moiety, which is a tricyclic aromatic compound with three non-linearly fused benzene.
2,4-dinitrophenyl-s-glutathione is a member of the class of compounds known as oligopeptides. Oligopeptides are organic compounds containing a sequence of between three and ten alpha-amino acids joined by peptide bonds. 2,4-dinitrophenyl-s-glutathione is practically insoluble (in water) and a moderately acidic compound (based on its pKa). 2,4-dinitrophenyl-s-glutathione can be found in a number of food items such as pineapple, tea, quince, and cabbage, which makes 2,4-dinitrophenyl-s-glutathione a potential biomarker for the consumption of these food products.
3-Epidemissidine is found in alcoholic beverages. 3-Epidemissidine is an alkaloid from Solanum tuberosum (potato).
N-Heptane, also known as heptan or CH3-[CH2]5-CH3, belongs to the class of organic compounds known as alkanes. These are acyclic branched or unbranched hydrocarbons having the general formula CnH2n+2 , and therefore consisting entirely of hydrogen atoms and saturated carbon atoms. Thus, N-heptane is considered to be a hydrocarbon lipid molecule. N-Heptane is a very hydrophobic molecule, practically insoluble in water, and relatively neutral. N-Heptane is a sweet, alkane, and ethereal tasting compound. N-heptane has been detected, but not quantified, in cardamoms and gingers. This could make N-heptane a potential biomarker for the consumption of these foods. This is done by shaking the stained paper in a heptane solution for about half a minute. N-Heptane is a potentially toxic compound. It was originally chosen as the zero point of the scale because of the availability of very high purity n-heptane, unmixed with other isomers of heptane or other alkanes, distilled from the resin of Jeffrey pine and from the fruit of Pittosporum resiniferum. As a liquid, it is ideal for transport and storage. The 2,2-dimethylpentane isomer can be prepared by reacting tert-butyl chloride with n-propyl magnesium bromide. The linear n-heptane can be obtained from Jeffrey pine oil. In water, both bromine and iodine appear brown. n-Heptane is the straight-chain alkane with the chemical formula H3C(CH2)5CH3 or C7H16.
Degarelix is used for the treatment of advanced prostate cancer. Degarelix is a synthetic peptide derivative drug which binds to gonadotropin-releasing hormone(GnRH) receptors in the pituitary gland and blocks their interaction with GnRH. This antagonism reduces luteinising hormone (LH), follicle-stimulating hormone (FSH) and in turn, testosterone suppression. Reduction in testosterone is important in treating men with advanced prostate cancer.
Lenalidomide (initially known as CC-5013 and marketed as Revlimid by Celgene) is a derivative of thalidomide introduced in 2004. It was initially intended as a treatment for multiple myeloma, for which thalidomide is an accepted therapeutic modality, but has also shown efficacy in the hematological disorders known as the myelodysplastic syndromes. [Wikipedia]
Allyl phenoxyacetate is a flavouring ingredien
Emodinanthranol is found in alcoholic beverages. Emodinanthranol is isolated from Hypericum perforatum (St. John's wort).
Piplartine is found in herbs and spices. Piplartine is an alkaloid from the roots of Piper longum (long pepper
Scopolamine, also known as hyoscine, is a tropane alkaloid drug obtained from plants of the family Solanaceae (nightshades), such as henbane or jimson weed (Datura species). It is part of the secondary metabolites of plants. Scopolamine is used criminally as a date rape drug and as an aid to robbery, the most common act being the clandestine drugging of a victim's drink. It is preferred because it induces retrograde amnesia, or an inability to recall events prior to its administration. Victims of this crime are often admitted to a hospital in police custody, under the assumption that the patient is experiencing a psychotic episode. A telltale sign is a fever accompanied by a lack of sweat. An alkaloid from Solanaceae, especially Datura metel L. and Scopola carniolica. Scopolamine and its quaternary derivatives act as antimuscarinics like atropine, but may have more central nervous system effects. Among the many uses are as an anesthetic premedication, in urinary incontinence, in motion sickness, as an antispasmodic, and as a mydriatic and cycloplegic.
An opioid analgesic with actions and uses similar to those of morphine, apart from an absence of cough suppressant activity. It is used in the treatment of moderate to severe pain, including pain in obstetrics. It may also be used as an adjunct to anesthesia. (From Martindale, The Extra Pharmacopoeia, 30th ed, p1092)
Endomorphin-1 (H-Tyr-Pro-Trp-Phe-NH2) and endomorphin-2 (H-Tyr-Pro-Phe-Phe-NH2) are peptide amides with the highest known affinity and specificity for the mu-opioid receptor.
Endomorphin-1 (H-Tyr-Pro-Trp-Phe-NH2) and endomorphin-2 (H-Tyr-Pro-Phe-Phe-NH2) are peptide amides with the highest known affinity and specificity for the mu-opioid receptor.
Nitazoxanide, also known by the brand name Alinia, is a synthetic nitrothiazolyl-salicylamide derivative and an anti-protozoal agent. It is approved for treatment of infectious diarrhea caused by Cryptosporidium parvum and Giardia lamblia in patients 1 year of age and older. Following oral administration it is rapidly hydrolyzed to its active metabolite, tizoxanide, which is 99% protein bound. Peak concentrations are observed 1-4 hours after administration. It is excreted in the urine, bile and feces. Untoward effects include abdominal pain, vomiting and diarrhea. [Wikipedia]
Eugenitin is found in cloves. Eugenitin is from Eugenia caryophyllata (clove
trans-Isoasarone is found in carrot. trans-Isoasarone is a constituent of Asarum species and carrot seed (Daucus carota) (CCD)
Mycophenolic acid O-acyl-glucuronide is a metabolite of mycophenolate mofetil. Mycophenolate mofetil (MMF) (brand names CellCept, Myfortic) is an immunosuppressant and prodrug of mycophenolic acid, used extensively in transplant medicine. It is a reversible inhibitor of inosine monophosphate dehydrogenase (IMPDH) in purine biosynthesis which is necessary for the growth of T cells and B cells. Other cells are able to recover purines via a separate, scavenger, pathway and are, thus, able to escape the effect. MMF is a less toxic alternative to azathioprine. (Wikipedia)
Hydrogen ion is recommended by IUPAC as a general term for all ions of hydrogen and its isotopes.  Depending on the charge of the ion, two different classes can be distinguished: positively charged ions and negatively charged ions. Under aqueous conditions found in biochemistry, hydrogen ions exist as the hydrated form hydronium, H3O+, but these are often still referred to as hydrogen ions or even protons by biochemists. [Wikipedia])
Ivacaftor is only found in individuals that have used or taken this drug. It is a drug for the treatment of cystic fibrosis, developed by Vertex Pharmaceuticals and the Cystic Fibrosis Foundation.Cystic fibrosis is caused by any one of several defects in a protein, cystic fibrosis transmembrane conductance regulator, which regulates fluid flow within cells and affects the components of sweat, digestive fluids, and mucus. The defect, which is caused by a mutation in the individual's DNA, can be in any of several locations along the protein, each of which interferes with a different function of the protein. One mutation, G551D, lets the CFTR protein reach the epithelial cell surface, but doesn't let it transport chloride through the ion channel. Ivacaftor is a potentiator of the CFTR protein. The CFTR protein is a chloride channel present at the surface of epithelial cells in multiple organs. Ivacaftor facilitates increased chloride transport by potentiating the channel-open probability (or gating) of the G551D-CFTR protein.
Cangrelor (trade name: Kengreal (US), Kengrexal (Europe)) is a P2Y12 antagonist FDA approved as an antiplatelet drug that is administered intravenously to reduce ischemic events (i.e. restricted blood flow) in patients undergoing percutaneous coronary intervention (PCI). PCI, also known as coronary angioplasty, is a nonsurgical procedure which opens blocked or narrowed coronary arteries that are clogged due to a buildup of plaque. Being an adenosine triphosphate (ATP) analogue, cangrelor is able to bind the adenosine diphosphate (ADP) receptor P2Y12 and inhibit ADP-mediated platelet activation and aggregation. An advantage cangrelor provides over oral P2Y12 inhibitors (e.g. clopidogrel, ticagrelor, ticlopidine, and prasugrel) is that it is an active drug not requiring hepatic conversion, therefore, providing a rapid onset and offset of action (PMID: 27729681).
Genipin is found in beverages. Genipin is a constituent of Genipa americana (genipap) Genipin is an aglycone derived from an iridoid glycoside called geniposide present in fruit of Gardenia jasminoides. Genipin is an excellent natural cross-linker for proteins, collagen, gelatin, and chitosan cross-linking. It has a low acute toxicity, with LD50 i.v. 382 mg/kg in mice, therefore, much less toxic than glutaraldehyde and many other commonly used synthetic cross-linking regents. It is also used for pharmaceutical purposes, such as choleretic action for liver diseases control
Octacosanoic acid is a very-long-chain fatty acid found in human brain and visceral organs (PMID:2474624). Octacosanoic acid is a higher aliphatic primary acids purified from sugar-cane (Saccharum officinarum L.) wax that has been shown to inhibit platelet aggregation induced ex vivo by addition of agonists to platelet-rich plasma (PRP) of rats, guinea pigs, and healthy human volunteers. (PMID:5099499). Octacosanoic acid is formed from octacosanol via beta-oxidation. (PMID:15847942).
(2S,4R,6S)-2-[2-(4-hydroxy-3-methoxyphenyl)ethyl]tetrahydro-6-(4-hydroxy-3,5-dimethoxyphenyl)-2H-pyran-4-ol is found in herbs and spices. (2S,4R,6S)-2-[2-(4-hydroxy-3-methoxyphenyl)ethyl]tetrahydro-6-(4-hydroxy-3,5-dimethoxyphenyl)-2H-pyran-4-ol is a constituent of Zingiber officinale (ginger)
This compound belongs to the family of Seleninic Acids and Derivatives. These are compounds containing a seleninic acid moiety, with the general structure Rse(=O)OH
Imatinib is a drug used to treat certain types of cancer. It is currently marketed by Novartis as Gleevec (USA) or Glivec (Europe/Australia) as its mesylate salt, imatinib mesilate (INN). It is occasionally referred to as CGP57148B or STI571 (especially in older publications). It is used in treating chronic myelogenous leukemia (CML), gastrointestinal stromal tumors (GISTs) and a number of other malignancies. It is the first member of a new class of agents that act by inhibiting particular tyrosine kinase enzymes, instead of non-specifically inhibiting rapidly dividing cells.
Murrayacinine is found in herbs and spices. Murrayacinine is an alkaloid from the stem bark of Murraya koenigii (curryleaf tree
Glycitin is an isoflavone glycoside present in human diets containing soy. The transformation of glycitin by intestinal microflora produces glycitein, a compound found to scavenge intracellular reactive oxygen species. Diverse bacteria strains from human origin have specific activity (beta-glucosidase activity) in the metabolism of dietary flavonoids. Soy isoflavones are popular supplements based on their potential protection against cancer and their use as alternative hormone replacement therapy. Is one of the isoflavones present in ready-to-feed soy-based infant formula. (PMID: 17516245, 17157426, 17439230, 12607743).
Leukotriene A4 (LTA4) is the first metabolite in the series of reactions leading to the synthesis of all leukotrienes. 5-Lipoxygenase (5-LO) catalyzes the two-step conversion of arachidonic acid to LTA4.The first step consists of the oxidation of arachidonic acid to the unstable intermediate 5-hydroperoxyeicosatetraenoic acid (5-HPETE), and the second step is the dehydration of 5-HPETE to form LTA4. Leukotriene A4, an unstable epoxide, is hydrolyzed to leukotriene B4 or conjugated with glutathione to yield leukotriene C4 and its metabolites, leukotriene D4 and leukotriene E4. The leukotrienes participate in host defense reactions and pathophysiological conditions such as immediate hypersensitivity and inflammation. Recent studies also suggest a neuroendocrine role for leukotriene C4 in luteinizing hormone secretion. (PMID: 10591081, 2820055). Leukotrienes are eicosanoids. The eicosanoids consist of the prostaglandins (PGs), thromboxanes (TXs), leukotrienes (LTs), and lipoxins (LXs). The PGs and TXs are collectively identified as prostanoids. Prostaglandins were originally shown to be synthesized in the prostate gland, thromboxanes from platelets (thrombocytes), and leukotrienes from leukocytes, hence the derivation of their names. All mammalian cells except erythrocytes synthesize eicosanoids. These molecules are extremely potent, able to cause profound physiological effects at very dilute concentrations. All eicosanoids function locally at the site of synthesis, through receptor-mediated G-protein linked signalling pathways.
Neuroprotectin D1 is an autacoid protectin. Autacoids are chemical mediators including the families of resolvins and protectins, defined by their potent bioactions and novel chemical structures. They require enzymatic generation from docosanoids, oxygenated products from docosahexaenoic acid (DHA), which specifically possess a conjugated triene double-bond system in their structures, are denoted protectins. The protectins demonstrate anti-inflammatory and neuroprotective actions in vivo. Resolvins and protectins have specific stereoselective actions which evoke biological actions in the nanogram range in vivo and are natural exudate products. Resolvins and protectins as distinct chemical families join the lipoxins as potent agonists of endogenous anti-inflammation and are proresolving chemical mediators of interest in human disease as potential new approaches to treatment. The terms protectin and neuroprotectin [the term applied to protectin that is generated in the neural tissues] were introduced given the anti-inflammatory and protective actions of the 10,17-docosatriene in neural systems, stroke, and animal models of Alzheimer's disease. The prefix in neuroprotectin (NPD1) provides a local pathway address for the biosynthesis and action of this molecule. In recent years, investigators have recognized inflammation as playing a key role in many prevalent diseases not previously considered to be of inflammatory etiology. These include Alzheimer's disease, cardiovascular disease, and cancer, which now join those well-appreciated inflammatory disorders such as arthritis and periodontal disease. Identifying the molecular mechanism(s) that underlie the many reports of the benefits of dietary omega-3 PUFAs remains an important challenge for nutrition and medicine. Thus, that these new mediator families, resolvins and protectins, are biosynthesized from EPA and DHA, act locally, and possess potent, novel bioactions is of interest to researchers. (PMID: 17090225).
Saxagliptin (rINN), previously identified as BMS-477118, is a new oral hypoglycemic (anti-diabetic drug) of the new dipeptidyl peptidase-4 (DPP-4) inhibitor class of drugs. It was developed by Bristol-Myers Squibb. A New Drug Application for saxagliptin in the treatment of type 2 diabetes was submitted to the FDA in June 2008. It was based on a drug development program with 8 randomized trials: 1 phase 2 dose-ranging (2.5 - 100 mg/d) study; 6 phase 3, 24-week controlled trials with additional controlled follow-up from 12 to 42 months, double-blinded throughout; and one 12-week mechanism-of-action trial with a 2-year follow-up period. In June 2008, it was announced that Onglyza would be the trade name under which saxagliptin will be marketed.
Ketamine is only found in individuals that have used or taken this drug. It is a cyclohexanone derivative used for induction of anesthesia. Its mechanism of action is not well understood, but ketamine can block NMDA receptors (receptors, N-methyl-D-aspartate) and may interact with sigma receptors. [PubChem]Ketamine has several clinically useful properties, including analgesia and less cardiorespiratory depressant effects than other anaesthetic agents, it also causes some stimulation of the cardiocascular system. Ketamine has been reported to produce general as well as local anaesthesia. It interacts with N-methyl-D-aspartate (NMDA) receptors, opioid receptors, monoaminergic receptors, muscarinic receptors and voltage sensitive Ca ion channels. Unlike other general anaesthetic agents, ketamine does not interact with GABA receptors.
2-Ethylpyrazine, also known as fema 3281 or moldin, belongs to the class of organic compounds known as pyrazines. Pyrazines are compounds containing a pyrazine ring, which is a six-member aromatic heterocycle, that consists of two nitrogen atoms (at positions 1 and 4) and four carbon atoms. 2-Ethylpyrazine is a bitter, cocoa, and musty tasting compound. 2-Ethylpyrazine has been detected, but not quantified, in several different foods, such as asparagus, pulses, cocoa and cocoa products, cereals and cereal products, and tortilla chips.
Maslinic acid is a pentacyclic triterpene, found in the non-glyceride fraction of olive pomace oil (Olive pomace oil, also known as "orujo" olive oil, is a blend of refined-pomace oil and virgin olive oil, fit for human consumption). Pentacyclic triterpenes are natural compounds which are widely distributed in plants. These natural products have been demonstrated to possess anti-inflammatory properties. Triterpenoids have been reported to possess antioxidant properties, since they prevent lipid peroxidation and suppress superoxide anion generation. The triterpenes have a history of medicinal use in many Asian countries. Maslinic acid exhibits both pro- and anti-inflammatory properties depending on chemical structure and dose and may be useful in modulating the immune response; further studies are required to confirm the immunomodulatory behaviour of this triterpenoid, and characterise the mechanisms underlying the biphasic nature of some aspects of the inflammatory response. (PMID: 17292619).
Food colourant especies for sausage casings and pet food (dogs, cats)and is) also used as a constituent of paper/board food packaging materials
(20R)-Ginsenoside Rg3 is found in tea. (20R)-Ginsenoside Rg3 is isolated from Panax ginseng (ginseng).
Ethopropazine is only found in individuals that have used or taken this drug.Ethopropazine (also known as profenamine hydrochloride) is a medication derived from phenothiazine. It is primarily used as an antidyskinetic to treat parkinsonism. It is sold under the trade names Parsidol in the United States and Parsidan in Canada.Ethopropazine's antiparkinson action can be attributed to its anticholinergic properties. Ethopropazine partially blocks central (striatal) cholinergic receptors, thereby helping to balance cholinergic and dopaminergic activity in the basal ganglia; salivation may be decreased, and smooth muscle may be relaxed. Drug-induced extrapyramidal symptoms and those due to parkinsonism may be relieved, but tardive dyskinesia is not alleviated and may be aggravated by anticholinergic effects. Ethopropazine's local anesthetic effect is due to its antagonism of the NMDA glutamate receptor. Glutamate is recognized as an important transmitter in nociceptive pathways, and the N-methyl-D-aspartate (NMDA) subtype of the glutamate receptor, in particular, has been implicated in the mediation of neuropathic pain. Excessive release of glutamate at NMDA receptors on dorsal horn neurons of the spinal cord results in hyperactivation and hypersensitivity of these receptors (perceived as hyperalgesia), thought to be an integral feature of neuropathic pain.
Diethylthiophosphate, also known as DETP, belongs to the class of organic compounds known as thiophosphate diesters. These are organic compounds containing the thiophosphoric acid functional group or a derivative thereof, with the general structure ROP(OR')(OR'')=S, where exactly two R-groups are organyl groups. The glutathione transferase reactions produce products that are, in most cases, of low toxicity. Diethylthiophosphate is a potentially toxic compound. Acute OP intoxication results from blockage of the decomposition of synaptic acetylcholine because the pesticide covalently binds to chlolinesterase Chronic exposure to POs has neurological sequelae as well and data suggests that OP exposure alters sperm chromatin condensation (A3181, A3182, A3183, A3181). Chronic exposure to POs has neurological sequelae as well (PMID 8179040) and data suggests that OP exposure alters sperm chromatin condensation (PMID 15050412). PON1 hydrolyzes the active metabolites in several organophosphates insecticides as well as, nerve agents such as soman, sarin, and VX. Metabolism of organophosphates occurs principally by oxidation, by hydrolysis via esterases and by reaction with glutathione. Acute OP intoxication results from blockage of the decomposition of synaptic acetylcholine because the pesticide covalently binds to chlolinesterase (PMID 11991535).
Mono-(2-ethyl-5-hydroxyhexyl) phthalate, also known as 40321-99-1 or phthalic acid mono(2-ethyl-5-hydroxyhexyl) ester, is classified as a member of the benzoic acid esters. Benzoic acid esters are ester derivatives of benzoic acid. 40321-99-1 is considered to be practically insoluble (in water) and acidic. (ChemoSummarizer) Mono-(2-ethyl-5-hydroxyhexyl) phthalate is a metabolite of mono(2-ethylhexyl) phthalate (MEHP) and a secondary metabolite of di(2-ethylhexyl) phthalate (DEHP) [Exposome-Explorer]. Di(2-ethylhexyl) phthalate (DEHP) is added to polyvinyl chloride (PVC) plastics used widely in medical devices and toys to impart flexibility and durability (Pubmed: 16332407).
Mono-(2-ethyl-5-oxohexyl) phthalate, also known as 2-{[(2-ethyl-5-oxohexyl)oxy]carbonyl}benzoic acid, mono(2-Ethyl-5-oxohexyl) phthalate or phthalate mono(2-ethyl-5-oxohexyl) ester, is classified as a member of the benzoic acid esters. Benzoic acid esters are ester derivatives of benzoic acid. Mono-(2-ethyl-5-oxohexyl) phthalate is considered to be practically insoluble (in water) and acidic. (ChemoSummarizer). Mono-(2-ethyl-5-oxohexyl) phthalate is a metabolite of mono(2-ethylhexyl) phthalate (MEHP) and a secondary metabolite of di(2-ethylhexyl) phthalate (DEHP).
Monomethyl phthalate is a metabolite, or breakdown product, of dimethyl phthalate, used in insect repellant, plastic, and as a rocket propellant.
Monoethyl phthalate (mEtP) is a metabolite, or breakdown product, of diethyl phthalate, used in perfume, cologne, deodorant, soap, shampoo, lotion, and other personal care products, particularly those containing fragrance.
Mono-benzyl phthalate, also known as benzene-1,2-dicarboxylic acid, monobenzyl ester or benzyl hydrogen phthalate, is a metabolite of butyl benzyl phthalate (BBzP). It can be found in human biofluids. Phthalates are industrial chemicals that are added to plastics to impart flexibility and resilience and are often referred to as plasticizers. Phthalates also are used as solubilizing or stabilizing agents in other applications. There are numerous products that may contain phthalates: adhesives; automotive plastics; detergents; lubricating oils; some medical devices and pharmaceuticals; plastic raincoats; solvents; vinyl tiles and flooring; and personal-care products, such as soap, shampoo, deodorants, lotions, fragrances, hair spray, and nail polish. Phthalates are often used in polyvinyl chloride type plastics, such as plastic packaging film and sheet, garden hoses, inflatable recreational toys, blood product storage bags, intravenous medical tubing, and toys. Because they are not chemically bound to the plastics to which they are added, phthalates can be released into the environment during use or disposal of the product. People are exposed to phthalates through ingestion, inhalation, and, to a lesser extent, dermal contact with products that contain phthalates. Phthalates have low acute animal toxicity. In animals, phthalates produced anti-androgenic effects by reducing testosterone production and, at very high levels, reducing estrogen production, effects that may be mediated by inhibiting testicular and ovarian steroidogenesis. (ChemoSummarizer)
24-Epibrassinolide is found in broad bean. 24-Epibrassinolide is a constituent of Vicia faba pollen.
A cyclodecane isolated from the bark of the Pacific yew tree, TAXUS brevifolia. It stabilizes microtubules in their polymerized form leading to cell death. [PubChem] ABI-007 (Abraxane) is the latest attempt to improve upon paclitaxel, one of the leading chemotherapy treatments. Both drugs contain the same active agent, but Abraxane is delivered by a nanoparticle technology that binds to albumin, a natural protein, rather than the toxic solvent known as Cremophor. It is thought that delivering paclitaxel with this technology will cause fewer hypersensitivity reactions and possibly lead to greater drug uptake in tumors.
Isoliquiritigenin is found in pulses. Isoliquiritigenin is isolated from Medicago specie
Melleolide is found in mushrooms. Melleolide is isolated from Armillaria mellea (honey mushroom
Mangiferol, also known as alpizarin or chinomin, is a member of the class of compounds known as xanthones. Xanthones are polycyclic aromatic compounds containing a xanthene moiety conjugated to a ketone group at carbon 9. Xanthene is a tricyclic compound made up of two benzene rings linearly fused to each other through a pyran ring. Mangiferol is slightly soluble (in water) and a very weakly acidic compound (based on its pKa). Mangiferol can be found in mango, which makes mangiferol a potential biomarker for the consumption of this food product.
Benzenebutanoic acid (also known as 4-phenylbutyrate, or 4-PBA) is the oral form of butyrate, which is known to be a transcriptional regulator. Sodium-4-PBA has been shown to induce fetal hemoglobin, and it has been used in clinical trials for sickle cell anemia and &#946;-thalassemia. Because gene expression profiles became more differentiated, it is in phase I trials in several different malignant disorders. The potential for therapeutic benefit in cystic fibrosis (CF) resides in an additional mechanism, involving protein folding and the ER (endoplasmic reticulum) environment (PMID 12458151). 4-PBA is a drug that was developed to treat elevated blood ammonia in urea cycle disorders, a histone deacetylase inhibitor that promotes mutation &#916;F508 cystic fibrosis transmembrane conductance regulator (CFTR) trafficking (PMID 16798551).
3,4-Dihydroxyhydrocinnamic acid, also known as dihydrocaffeic acid (DHCA), is a metabolite product of the hydrogenation of caffeoylquinic acids, occurring in normal human biofluids, with potent antioxidant properties. DHCA has been detected in human plasma following coffee ingestion (PMID: 15607645) and is increased with some dietary sources, such as after ingestion of phenolic constituents of artichoke leaf extract (PMID: 15693705). Polyphenol-rich foods such as vegetables and fruits have been shown to significantly improve platelet function in ex vivo studies in humans (PMID: 16038718). Its antioxidant activity has been tested to reduce ferric iron in the ferric reducing antioxidant power (FRAP) assay, and it has been suggested that its catechol structure conveys the antioxidant effect in plasma and in erythrocytes (PMID: 11768243). 3,4-Dihydroxyhydrocinnamic acid is a microbial metabolite found in Bifidobacterium, Escherichia, Lactobacillus, and Clostridium (PMID: 28393285).
Ticagrelor (trade name Brilinta in the US, Brilique and Possia in the EU) is a platelet aggregation inhibitor produced by AstraZeneca. The drug was approved for use in the European Union by the European Commission on December 3, 2010. The drug was approved by the US Food and Drug Administration on July 20, 2011.
Bisdemethoxycurcumin is a curcuminoid, a component of tumeric. Tumeric is a spice that comes from the root Curcuma longa, a member of the ginger family, Zingaberaceae. It is bright yellow and has been used as a coloring agent in food in the United States. In India, it has been used for centuries as a spice and a food preservative, and also for its various medicinal properties. In Ayurveda (Indian traditional medicine), tumeric has been used for its medicinal properties for various indications and through different routes of administration. It has been used topically on the skin for wounds, blistering diseases such as pemphigus and herpes zoster, for parasitic skin infections, and for acne. It has been used via oral administration for the common cold, liver diseases, urinary tract diseases, and as a blood purifier. For chronic rhinitis and coryza, it has been used via inhalation. The average intake of tumeric in the diet in India is approximately 2 to 2.5 g in a 60 kg individual. This corresponds to an intake of approximately 60 to 100 mg of curcumin daily. The Food and Drug Administration has classified tumeric among substances Generally Recognized as Safe (GRAS). A large number of in vitro and animal studies have been conducted to evaluate the effect of curcumin on inflammation. It has been found to act at various different levels of the arachadonic acid inflammatory cascade and through effects on various enzymes and cytokines. (PMID: 12676044).
Insecticide, interfering with chitin deposition by oral absorption. Diflubenzuron is used on soya beans, citrus, tea, vegetables and mushrooms. Also used as an insecticide in feed for poultry and pigs and as a controlled release bolus in cattl
This compound belongs to the family of Ubiquinones. These are coenzyme Q derivatives containing a 5, 6-dimethoxy-3-methyl(1,4-benzoquinone) moiety to which an isoprenyl group is attached at ring position 2(or 6).
(E)-3-Octen-1-ol is found in fruits. (E)-3-Octen-1-ol is found in ripe banana
1-Hexanol is an organic alcohol with a six carbon chain and a condensed structural formula of CH3(CH2)5OH. This colorless liquid is slightly soluble in water, but miscible with ether and ethanol. Two additional straight chain isomers of 1-hexanol exist, 2-hexanol and 3-hexanol, both of which differ by the location of the hydroxyl group. Many isomeric alcohols have the formula C6H13OH. 1-hexanol is believed to be a component of the odour of freshly mown grass. It is used in the perfume industry.
Eplerenone, an aldosterone receptor antagonist similar to spironolactone, has been shown to produce sustained increases in plasma renin and serum aldosterone, consistent with inhibition of the negative regulatory feedback of aldosterone on renin secretion. The resulting increased plasma renin activity and aldosterone circulating levels do not overcome the effects of eplerenone. Eplerenone selectively binds to recombinant human mineralocorticoid receptors relative to its binding to recombinant human glucocorticoid, progesterone and androgen receptors.
Rilpivirine belongs to the class of organic compounds known as nitrotoluenes. These are organic aromatic compounds containing a benzene that carries a single methyl group and at least 1 nitro group.
4-(3-pyridyl)-4-oxobutyramide (POBAM) is a metabolite of nicotine and cotinine degradation. (PMID: 9512938, 13872096).
Pitheduloside J is found in fruits. Pitheduloside J is a constituent of Pithecellobium dulce (manila tamarind).
Apigenin 6-C-glucoside 8-C-arabinoside is a polyphenol compound found in foods of plant origin  (PMID: 20428313)
Tadalafil is an orally adminstered drug used to treat male erectile dysfunction (impotence). It is marketed worldwide under the brand name Cialis. It is a phosphodiesterase 5 (PDE5) inhibitor. Tadalafil's distinguishing pharmacologic feature is its longer half-life (17.5 hours) compared with Viagra and Levitra (4-5 hours). This longer half-life results in a longer duration of action and is, in part, responsible for the Cialis nickname of the 'weekend pill.' This longer half-life also is the basis of current investigation for tadalafil's use in pulmonary arterial hypertension as a once-daily therapy. [Wikipedia]
Oseltamivir is only found in individuals that have used or taken this drug. It is an acetamido cyclohexene that is a structural homolog of sialic acid and inhibits neuraminidase. [PubChem]Oseltamivir is an ethyl ester prodrug requiring ester hydrolysis for conversion to the active form, oseltamivir carboxylate. The proposed mechanism of action of oseltamivir is inhibition of influenza virus neuraminidase with the possibility of alteration of virus particle aggregation and release.
Tectorigenin is an O-methylated isoflavone, a type of flavonoid. It can be isolated from leopard lily (Belamcanda chinensis) or Pueraria thunbergiana.
Kaempferol 3-rhamno-glucoside, also known as nicotiflorin or kaempferol 3-rutinoside, is a member of the class of compounds known as flavonoid-3-o-glycosides. Flavonoid-3-o-glycosides are phenolic compounds containing a flavonoid moiety which is O-glycosidically linked to carbohydrate moiety at the C3-position. Kaempferol 3-rhamno-glucoside is slightly soluble (in water) and a very weakly acidic compound (based on its pKa). Kaempferol 3-rhamno-glucoside can be found in ginkgo nuts and tea, which makes kaempferol 3-rhamno-glucoside a potential biomarker for the consumption of these food products.
Isorhamnetin 3-O-[b-D-glucopyranosyl-(1->2)-a-L-rhamnopyranoside] is found in fats and oils. Isorhamnetin 3-O-[b-D-glucopyranosyl-(1->2)-a-L-rhamnopyranoside] is a constituent of Ginkgo biloba (ginkgo).
Maysin is found in cereals and cereal products. Maysin is isolated from corn silk (Zea mays).
11beta-Hydroxyandrost-4-ene-3,17-dione is an intermediate in adrenosterone production. 11beta-Hydroxyandrost-4-ene-3,17-dione is produced from androst-4-ene-3,17-dione, a reaction catalyzed by the enzyme cytochrome P450 B [EC:1.14.15.4]. 11beta-Hydroxyandrost-4-ene-3,17-dione is then converted into adrenosterone by the enzyme 11beta-hydroxysteroid dehydrogenase [EC:1.1.1.146].
Apelin also known as APLN is a peptide which in humans is encoded by the APLN gene.[ Apelin is the endogenous ligand for the G-protein-coupled APJ receptor that is expressed at the surface of some cell types.[7] It is widely expressed in various organs such as the heart, lung, kidney, liver, adipose tissue, gastrointestinal tract, brain, adrenal glands, endothelium, and human plasma.
This compound belongs to the family of Alpha Amino Acids. These are amino acids in which the amino group is attached to the carbon atom immediately adjacent to the carboxylate group (alpha carbon).
1,3,5-Tribromo-2-(2,4-dibromophenoxy)benzene is classified as a Food Contaminant (code WG) in the DFC.
2,2',4,4',5,6'-Hexabromodiphenyl ether is classified as a Food Contaminant (code WG) in the DFC.
Asparaginyl-Serine is a dipeptide composed of asparagine and serine. It is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis. This dipeptide has not yet been identified in human tissues or biofluids and so it is classified as an 'Expected' metabolite.
Lafutidine is a histamine H2-receptor antagonist that inhibits histamine-stimulated gastric acid secretion. Due to the resulting reduction in gastric volume and acidity, lafutidine can be used to treat ulcers and reflux.
Kaempferol 3-glucuronide is found in chicory. Kaempferol 3-glucuronide is isolated from the leaves of Euphorbia lathyris, Euphorbia cyparissias, Anemone alpina and Phaseolus vulgaris (kidney bean) and many other plants [CCD
Desacetyl-nitazoxanide is a metabolite of lamivudine. Lamivudine (2',3'-dideoxy-3'-thiacytidine, commonly called 3TC) is a potent nucleoside analog reverse transcriptase inhibitor (nRTI). It is marketed by GlaxoSmithKline with the brand names Zeffix, Heptovir, Epivir, and Epivir-HBV. Lamivudine has been used for treatment of chronic hepatitis B at a lower dose than for treatment of HIV. It improves the seroconversion of e-antigen positive hepatitis B and also improves histology staging of the liver. (Wikipedia)
Melissic acid A is found in fats and oils. Melissic acid A is found in some plant waxes, e.g. cotto
Angiotensin IV is one of the N-terminal angiotensin degradation products of angiotensin II. Angiotensin IV (AngIV) mediates important physiologic functions in the central nervous system, including blood flow regulation, processes underlying to learning and memory, and presents anticonvulsant activity. The presence of AngIV-specific binding sites has been identified in various mammalian tissues, including blood vessels, heart, kidney, and brain. Besides the presence of AngIV binding sites in the cardiovascular system, the major AngIV synthesizing enzymes aminopeptidase N (APN) and aminopeptidase B (APB) are also expressed in different cell types of this system. AngIV activates several protein kinases, including phosphatidylinositol 3 kinase, PI-dependent kinase-1, extracellular signal-related kinases (ERK), protein kinase B-&#945;/Akt, and p70 ribosomal S6 kinase. AngIV could contribute to vascular damage, increasing the production of monocyte chemoattractant protein-1, the main chemokine involved in monocyte recruitment, and up-regulates the expression of the adhesion molecule intercellular adhesion molecule-1 that is involved in the attachment and transmigration of circulating cells into the damaged tissue. (PMID: 17210474).
Amygdalin is found in almond. Bitter glycoside of the Rosaceae, found especially in kernels of cherries, peaches and apricots. Amygdalin is present in cold pressed bitter almond oil from the above sources prior to enzymic hydolysis and steam distillation for food use Amygdalin , C20H27NO11, is a glycoside initially isolated from the seeds of the tree Prunus dulcis, also known as bitter almonds, by Pierre-Jean Robiquet and A. F. Boutron-Charlard in 1803, and subsequently investigated by Liebig and Wohler in 1830, and others. Several other related species in the genus of Prunus, including apricot (Prunus armeniaca) and black cherry (Prunus serotina), also contain amygdalin. It was promoted as a cancer cure by Ernst T. Krebs under the name "Vitamin B17", but studies have found it to be ineffective. Amygdalin is sometimes confounded with laevomandelonitrile, also called laetrile for short; however, amygdalin and laetrile are different chemical compounds
Bis(2-methylpropanoyloxy)-9,10-epoxy-p-mentha-1,3,5-triene is found in fats and oils. Bis(2-methylpropanoyloxy)-9,10-epoxy-p-mentha-1,3,5-triene is a constituent of various plant species including Madia sativa (Chile tarweed)
Beta-zearalenol is a nonsteroidal estrogen or mycoestrogen found in fungi belonging to the Fusarium genus including F. graminearum, F. culmorum, F. crookwellense, etc (PMID: 22095651),  As a mycotoxin, beta-zearalenol is a widely distributed compound that contaminates many crops, grains, and other commodities (PMID: 30830360). Beta-zearalenol is the beta epimer of alpha-zearalenol. It is also a major hepatic metabolite of zearalenone (another mycotoxin). Zearalenone has two major metabolites, alpha and beta zearalenol which are produced in the liver by 3α-hydroxisteroid dehydrogenase and 3β-hydroxisteroid dehydrogenase (PMID: 30830360). Beta-zearalenol is formed mainly in the liver but also to a lesser extent in the intestines during first-pass metabolism. It contains a lactone ring in its structure and is structurally analogous to estrogen, thus it can bind to estrogen receptors, and causes hepatotoxic, hematotoxic, immunotoxic, genotoxic, teratogenic and carcinogenic effects on different animal species (PMID: 17045381). However, beta-zearalenol is somewhat less active estrogenically than alpha-zearalenol.
Dutasteride belongs to a class of drugs called 5-alpha-reductase inhibitors, which block the action of the 5-alpha-reductase enzymes that convert testosterone into dihydrotestosterone (DHT). Finasteride also belongs to this group, but while dutasteride inhibits both isoforms of 5-alpha reductase, finasteride inhibits only one. Even so, a clinical study done by GlaxoSmithKline, the EPICS trial, did not find dutasteride to be more effective than finasteride in treating BPH. [Wikipedia]
Tyrosyl-Tyrosine is a dipeptied compoosed of two tyrosine residues. It is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis. This dipeptide has not yet been identified in human tissues or biofluids and so it is classified as an 'Expected' metabolite.
Formononetin are abundant in vegetables. It is a phyto-oestrogen that is a polyphenolic non-steroidal plant compound with oestrogen-like biological activity (PMID: 16108819). It can be the source of considerable estrogenic activity (http://www.herbalchem.net/Intermediate.htm).
ax-4''-Hydroxymaysin is found in cereals and cereal products. ax-4''-Hydroxymaysin is isolated from corn silk (Zea mays
Nonivamide, also known as pseudocapsaicin or hansaplast, belongs to the class of organic compounds known as methoxyphenols. Methoxyphenols are compounds containing a methoxy group attached to the benzene ring of a phenol moiety. Nonivamide is odorless and a bland tasting compound. Nonivamide is found, on average, in the highest concentration within a few different foods, such as yellow bell peppers, red bell peppers, and pepper (C. frutescens) and in a lower concentration in pepper (C. annuum), orange bell peppers, and green bell peppers. Nonivamide has also been detected, but not quantified, in herbs and spices. This could make nonivamide a potential biomarker for the consumption of these foods. Limited information is available on pharmacokinetics and metabolism of nonivamide. Agonism of the VR1 (TRPV1) (vanilloid) receptor by Nonivamide was demonstrated to induce the release of Ca2+ from the endoplasmic reticulum (ER) of human lung cells, producing ER stress and cell death . The cardiovascular effects are partly explained by substance P release. Administered intraperitoneally, the LD50 in rats was measured to be about 90 mg/kg. Nonivamide has been shown to stimulate afferent neurons with about half the potency of Capsaicin (PMID:6202305).
Allolithocholic acid is a bile acid present in normal serum and feces, with a tendency to be at higher concentrations in patients with colon cancer, particularly in men (PMID 16548228). A bile acid. Bile acids are steroid acids found predominantly in the bile of mammals. The distinction between different bile acids is minute, depending only on the presence or absence of hydroxyl groups on positions 3, 7, and 12. Bile acids are physiological detergents that facilitate excretion, absorption, and transport of fats and sterols in the intestine and liver. Bile acids are also steroidal amphipathic molecules derived from the catabolism of cholesterol. They modulate bile flow and lipid secretion, are essential for the absorption of dietary fats and vitamins, and have been implicated in the regulation of all the key enzymes involved in cholesterol homeostasis. Bile acids recirculate through the liver, bile ducts, small intestine and portal vein to form an enterohepatic circuit. They exist as anions at physiological pH and, consequently, require a carrier for transport across the membranes of the enterohepatic tissues. The unique detergent properties of bile acids are essential for the digestion and intestinal absorption of hydrophobic nutrients. Bile acids have potent toxic properties (e.g. membrane disruption) and there are a plethora of mechanisms to limit their accumulation in blood and tissues (PMID: 11316487, 16037564, 12576301, 11907135).
Catechin-(4alpha->8)-epigallocatechin is found in tea. Catechin-(4alpha->8)-epigallocatechin is isolated from Camellia sinensis assamica (Assam tea).
(-)-Thebaine is a minor constituent of opiu
Dimethyl trisulfide (DMTS) is an organic chemical compound and the simplest organic trisulfide. It is a flammable liquid with a foul odor, which is detectable at levels as low as 1 part per trillion. Dimethyl trisulfide has been found in volatiles emitted from cooked onion, leek and other Allium species, from broccoli and cabbage, as well as from Limburger cheese, and is involved in the unpalatable aroma of aged beer and stale Japanese sake. It is a decomposition product from bacterial decomposition, including from the early stages of human decomposition, and is a major attractant for blowflies looking for hosts. Dimethyl trisulfide along with dimethyl sulfide and dimethyl disulfide have been confirmed as volatile compounds given off by the fly-attracting plant known as dead-horse arum (Helicodiceros muscivorus). These flies are attracted to the odor of fetid meat and help pollinate this plant. DMTS contributes to the foul odor given off by the fungus Phallus impudicus, also known as the common stinkhorn. DMTS causes the characteristic malodorous smell of a fungating lesion, e.g., from cancer wounds, and contributes to the odor of human feces. Dimethyldisulfide is a volatile organic compound. Methyl disulfide is occasionally found as a volatile component of normal human breath and biofluids. Dimethyldisulfide is one of the representative volatile components found in oral malodor. Dimethyldisulfide concentrations in breath is a practical noninvasive way to assess recent exposure to sulfur compounds in sulfate pulp mills, and therefore it should be applicable to workplaces contaminated.  (PMID: 5556886, 14691119, 11236158, 8481097) (Wikipedia).
Zoledronate (zoledronic acid, marketed by Novartis under the trade names Zometa and Reclast) is a bisphosphonate. Zometa is used to prevent skeletal fractures in patients with cancers such as multiple myeloma and prostate cancer. It can also be used to treat hypercalcemia of malignancy and can be helpful for treating pain from bone metastases. An annual dose of Zoledronate may also prevent recurring fractures in patients with a previous hip fracture. Zoledronate is a single 5 mg infusion for the treatment of Paget's disease of bone. In 2007, the FDA also approved Reclast for the treatment of postmenopausal osteoporosis.
Bilastine is a second-generation piperidine H1-antihistamine.
Dihydrogenistein is a metabolite of the soy isoflavone genistin (the glycoside conjugate of genistein) by intestinal bacteria. Isoflavones are one of the three major classes of phytoestrogens; phytoestrogens are a diverse group of plant-derived compounds that structurally and functionally mimic mammalian estrogen. The isoflavone genistin is one of the most prevalent in soy foods. They are biologically inactive; once ingested, they are cleaved by glucosidases to "aglycones", genistein. Epidemiological studies have associated high soy intake with a lowered risk for certain hormone-dependent disease. Many studies reveal that the incidence of prostate cancer and breast cancer is much lower in Asian people in comparison to people from the West and, and the prevailing contribution to this difference has been attributed to the diet. Soy foods and soy-derived products which contain abundant isoflavones are consumed in large quantities by Asian people. In vitro, isoflavone metabolites have dual functions: they can act as an estrogenic agonist or antagonist depending on the estrogen concentration. (PMID: 17499260, 16965913). Dihydrogenistein is a biomarker for the consumption of soy beans and other soy products.
PIP2(16:0/16:0) is a phosphatidylinositol bisphosphate. Phosphatidylinositol bisphosphates are acidic (anionic) phospholipids that consist of a phosphatidic acid backbone, linked via the phosphate group to a bisphosphorylated inositol (hexahydroxycyclohexane). Phosphatidylinositol bisphosphates are generated from phosphatidylinositols which are phosphorylated by a number of different kinases that place the phosphate moiety on positions 4 and 5 of the inositol ring, although position 3 can also be phosphorylated. Phosphatidylinositols bisphosphates can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 18 and 20 carbons are the most common. PIP2(16:0/16:0), in particular, consists of one chain of palmitic acid at the C-1 position and one chain of palmitic acid at the C-2 position. The palmitic acid moiety is derived from fish oils, milk fats, vegetable oils and animal fats, while the palmitic acid moiety is derived from fish oils, milk fats, vegetable oils and animal fats. The most important phosphatidylinositol bisphosphate in both quantitative and biological terms is phosphatidylinositol 4,5-bisphosphate. Phosphatidylinositol and the phosphatidylinositol phosphates are the main source of diacylglycerols that serve as signaling molecules, via the action of phospholipase C enzymes. Phosphatidylinositols phosphates are usually present at low levels only in tissues, typically at about 1 to 3% of the concentration of phosphatidylinositol.
Piperic acid is found in herbs and spices. Piperic acid is obtained from black pepper (Piper nigrum), from Minthostachys verticillata, peppermint (Mentha piperita) and others.
Ethylphosphate is produced by the reaction between diethylphosphate and water, with ethanol as a byproduct.
Ethyl glucuronide is a natural human metabolite of Ethanol generated in the liver by UDP glucuonyltransferase. Glucuronidation is used to assist in the excretion of toxic substances, drugs or other substances that cannot be used as an energy source. Glucuronic acid is attached via a glycosidic bond to the substance, and the resulting glucuronide, which has a much higher water solubility than the original substance, is eventually excreted by the kidneys. Ethyl glucuronide is a general biomarker for the consumption of alcohol
Sulforaphane (SFN) is the most characterized isothiocyanate. SFN has received a great deal of attention because of its ability to simultaneously modulate multiple cellular targets involved in cancer development, including: (i) DNA protection by modulating carcinogen-metabolizing enzymes and blocking the action of mutagens; (ii) inhibition of cell proliferation and induction of apoptosis, thereby retarding or eliminating clonal expansion of initiated, transformed, and/or neoplastic cells; (iii) inhibition of neoangiogenesis, progression of benign tumors to malignant tumors, and metastasis formation. SFN is therefore able to prevent, delay, or reverse preneoplastic lesions, as well as to act on cancer cells as a therapeutic agent. Taking into account this evidence and its favorable toxicological profile, SFN can be viewed as a conceptually promising agent in cancer prevention and/or therapy. SFN is the hydrolysis product of glucoraphanin, particularly high in the young sprouts of broccoli and cauliflower. SFN can also be obtained by eating cruciferous vegetables such as brussel sprouts, broccoli, cauliflower, bok choy, kale, collards, arugula, broccoli sprouts, chinese broccoli, broccoli raab, kohlrabi, mustard, turnip, radish, watercress and cabbage (PMID:17134937).
Ginsenoside Rg5 is found in tea. Ginsenoside Rg5 is isolated from ginsen
Ginsenoside Rg5 is found in tea. Ginsenoside Rg5 is isolated from ginsen
Adenosine diphosphate ribose is a molecule formed into poly(ADP-ribose) or PAR chains by the enzyme poly ADP ribose polymerase or PARP. PARP is found in every cell nucleus. Its main role is to detect and signal single-strand DNA breaks (SSB) to the enzymatic machinery involved in the SSB repair. PARP activation is an immediate cellular response to metabolic, chemical, or radiation-induced DNA SSB damage. Once PARP detects a SSB, it binds to the DNA, and, after a structural change, begins the synthesis of a poly (ADP-ribose) chain (PAR) as a signal for the other DNA-repairing enzymes such as DNA ligase III (LigIII), DNA polymerase beta, and scaffolding proteins such as X-ray cross-complementing gene 1 (XRCC1). After repairing, the PAR chains are degraded via PAR glycohydrolase (PARG). ADP-ribose binds to and activates the TRPM2 ion channel. Adenosine diphosphate ribose is an intermediate in NAD metabolism. The enzyme NAD(P)+ nucleosidase [EC:3.2.2.6] catalyzes the production of this metabolite from nicotinamide adenine dinucleotide phosphate. This reaction is irreversible and occurs in the cytosol.
Nilotinib, also known as AMN107, is a tyrosine kinase inhibitor under investigation as a possible treatment for chronic myelogenous leukemia (CML). In June 2006, a Phase I clinical trial found nilotinib has a relatively favorable safety profile and shows activity in cases of CML resistant to treatment with imatinib (Gleevec&reg;), another tyrosine kinase inhibitor currently used as a first-line treatment. [Wikipedia]
Niobium, formerly columbium, is a chemical element with symbol Nb (formerly Cb) and atomic number 41. It is a soft, grey, ductile transition metal, which is often found in the pyrochlore mineral, the main commercial source for niobium, and columbite. The name comes from Greek mythology: Niobe, daughter of Tantalus.
Vardenafil (Levitra) is an oral therapy for the treatment of erectile dysfunction. It is a selective inhibitor of cyclic guanosine monophosphate (cGMP)-specific phosphodiesterase type 5 (PDE5). Penile erection is a hemodynamic process initiated by the relaxation of smooth muscle in the corpus cavernosum and its associated arterioles. During sexual stimulation, nitric oxide is released from nerve endings and endothelial cells in the corpus cavernosum. Nitric oxide activates the enzyme guanylate cyclase resulting in increased synthesis of cyclic guanosine monophosphate (cGMP) in the smooth muscle cells of the corpus cavernosum. The cGMP in turn triggers smooth muscle relaxation, allowing increased blood flow into the penis, resulting in erection. The tissue concentration of cGMP is regulated by both the rates of synthesis and degradation via phosphodiesterases (PDEs). The most abundant PDE in the human corpus cavernosum is the cGMPspecific phosphodiesterase type 5 (PDE5); therefore, the inhibition of PDE5 enhances erectile function by increasing the amount of cGMP.
3,3',4'5-Tetrahydroxystilbene (or Piceatannol) is a phenolic stilbenoid. It is a metabolite of resveratrol found in red wine. A viral protein-tyrosine kinase (LMP2A) implicated in leukemia, non-Hodgkin's lymphoma and other diseases associated with Epstein-Barr virus, was recently found to be blocked by picetannol in vitro (PMID 2590224). Therefore there is research interest in piceatannol as an anti-cancer and anti-EBV drug. Piceatannol can also act as an agonist for estrogen receptor alpha in human breast cancer cells (PMID: 16216908).
Afzelechin 7-apioside is a constituent of rhizomes of Polypodium glycyrrhiza (licorice fern)
Crocin is a water-soluble carotenoid pigment of saffron (Crocus sativus L.) that has been used as a spice for flavoring and coloring food preparations, and in Chinese traditional medicine as an anodyne or tranquilizer. Saffron is now used worldwide in folk medicine and is reputed to be useful in treating various human disorders such as heart and blood disorders. Stroke and heart attack are involved in reputed folkloric uses of saffron. Saffron is orally administrated as a decoction. Saffron extract exerts a protective effect on renal ischemia reperfusion induced oxidative damage in rats. Crocin suppresses tumor necrosis factor (TNF)alpha-induced apoptosis of pheochromocytoma (PC12) cells by modulating mRNA expressions of Bcl-2 family proteins, which trigger downstream signals culminating in caspase-3 activation followed by cell death. Depriving cultured PC12 cells of serum/glucose causes a rapid increase in cellular ceramide levels, followed by an increase in the risk of cell death. The accumulation of ceramide was found to depend on the activation of neutral sphingomyelinase (nSMase). Crocin prevented the activation of nSMase by enhancing the transcription of gamma-glutamylcysteinyl synthase, which contributes to a stable glutathione supply that blocks the activity of nSMase. (PMID: 17215084). Crocetin esters present in saffron stigmas and in Gardenia jasminoides Ellis fruit are the compounds responsible for their color. (PMID: 16448211).
T2 Toxin is isolated from Fusarium species and Trichoderma lignorum. T2 Toxin is an important mycotoxin occurring naturally in various agricultural products.
2-Ethyl-2,5-dihydro-4,5-dimethylthiazole is maillard produced in foods. 2-Ethyl-2,5-dihydro-4,5-dimethylthiazole is a flavouring agent for meats and soups, doubtless as a mixture of cis- and trans-forms.
Maraviroc (brand-named Selzentry, or Celsentri outside the U.S.) is a chemokine receptor antagonist drug developed by the drug company Pfizer that is designed to act against HIV by interfering with the interaction between HIV and CCR5. It was originally labelled as UK-427857 during development but was assigned the Maraviroc name as it entered trials. It was approved for use by the FDA in August, 2007.
Polymyxin B sulfate is a mixture of polymyxins B1 and B2, obtained from Bacillus polymyxa strains. They are basic polypeptides of about eight amino acids and have cationic detergent action on cell membranes. Polymyxin B is used for infections with gram-negative organisms, but may be neurotoxic and nephrotoxic. All gram-positive bacteria, fungi, and the gram-negative cocci, N. gonorrhea and N. menigitidis, are resistant. It is appropriate for treatment of infections of the urinary tract, meninges, and blood stream, caused by susceptible strains of Pseudomonas aeruginosa.
Iridium, also known as 77ir or iridio, is a member of the class of compounds known as homogeneous transition metal compounds. Homogeneous transition metal compounds are inorganic compounds containing only metal atoms,with the largest atom being a transition metal atom. Iridium can be found in cucumber, which makes iridium a potential biomarker for the consumption of this food product. The most important iridium compounds in use are the salts and acids it forms with chlorine, though iridium also forms a number of organometallic compounds used in industrial catalysis, and in research. Iridium metal is employed when high corrosion resistance at high temperatures is needed, as in high-performance spark plugs, crucibles for recrystallization of semiconductors at high temperatures, and electrodes for the production of chlorine in the chloralkali process. Iridium radioisotopes are used in some radioisotope thermoelectric generators .
1,3-Diphenyl-1-propanone is found in mushrooms. 1,3-Diphenyl-1-propanone is isolated from Phallus impudicus (common stinkhorn
Otobanone is found in herbs and spices. Otobanone is isolated from nutmeg (Myristica fragrans
4-Phenylpyridine is found in herbs and spices. 4-Phenylpyridine occurs in tea and peppermint.
(-)-Epigallocatechin is found in almond. (-)-Epigallocatechin is widespread in plants; broad beans are an especially good source; present in green and black tea. Potential nutriceutica
Resveratrol is a polyphenolic phytoalexin. It is also classified as a stilbenoid, a derivate of stilbene, and is produced in plants with the help of the enzyme stilbene synthase. The levels of resveratrol found in food vary greatly. Red wine contains between 0.2 and 5.8 mg/L depending on the grape variety, while white wine has much less. The reason for this difference is that red wine is fermented with grape skins, allowing the wine to absorb the resveratrol, whereas white wine is fermented after the skin has been removed. Resveratrol is also sold as a nutritional supplement. A number of beneficial health effects, such as anti-cancer, antiviral, neuroprotective, anti-aging, anti-inflammatory, and life-prolonging effects have been reported for resveratrol. The fact that resveratrol is found in the skin of red grapes and as a constituent of red wine may explain the "French paradox". This paradox is based on the observation that the incidence of coronary heart disease is relatively low in southern France despite high dietary intake of saturated fats. Resveratrol is thought to achieve these cardioprotective effects by a number of different routes: (1) inhibition of vascular cell adhesion molecule expression; (2) inhibition of vascular smooth muscle cell proliferation; (3) stimulation of endothelial nitric oxide synthase (eNOS) activity; (4) inhibition of platelet aggregation; and (5) inhibition of LDL peroxidation (PMID: 17875315, 14676260, 9678525). Resveratrol is a biomarker for the consumption of grapes and raisins.
Diaminopimelic acid or DAPA is a lysine-like amino acid derivative that is a key component of the bacterial cell wall. DAPA is incorporated or integrated into peptidoglycan of gram negative bacteria and is the attachment point for Braun's lipoprotein (BLP or Murein Lipoprotein). BLP is found in gram-negative cell walls and is one of the most abundant membrane proteins. BLP is bound at its C-terminal end (a lysine) by a covalent bond to the peptidoglycan layer (specifically to diaminopimelic acid molecules) and is embedded in the outer membrane by its hydrophobic head (a cysteine with lipids attached). BLP tightly links the two layers and provides structural integrity to the bacterial outer membrane. Diaminopimelic acid can be found in human urine or feces due to the lysis or enzymatic breakdown of gram negative gut microbes.
Amoxapine, the <i>N</i>-demethylated derivative of the antipsychotic agent loxapine, is a dibenzoxazepine-derivative tricyclic antidepressant (TCA). TCAs are structurally similar to phenothiazines. They contain a tricyclic ring system with an alkyl amine substituent on the central ring. In non-depressed individuals, amoxapine does not affect mood or arousal, but may cause sedation. In depressed individuals, amoxapine exerts a positive effect on mood. TCAs are potent inhibitors of serotonin and norepinephrine reuptake. In addition, TCAs down-regulate cerebral cortical &beta;-adrenergic receptors and sensitize post-synaptic serotonergic receptors with chronic use. The antidepressant effects of TCAs are thought to be due to an overall increase in serotonergic neurotransmission. TCAs also block histamine H<sub>1</sub> receptors, &alpha;<sub>1</sub>-adrenergic receptors and muscarinic receptors, which accounts for their sedative, hypotensive and anticholinergic effects (e.g. blurred vision, dry mouth, constipation, urinary retention), respectively. See toxicity section below for a complete listing of side effects. Amoxapine may be used to treat neurotic and reactive depressive disorders, endogenous and psychotic depression, and mixed symptoms of depression and anxiety or agitation.
7b-Hydroxydehydroepiandrosterone is one of the major metabolites of dehydroepiandrosterone. Dehydroepiandrosterone (DHEA) is a precursor of testosterone. DHEA) is 7a-hydroxylated by the cytochrome P450 7B1 (CYP7B1) in the human brain and liver. This produces 7a-hydroxy-DHEA that is a substrate for 11b-hydroxysteroid dehydrogenase type 1 (11b-HSD1) which exists in the same tissues and carries out the inter-conversion of 7a- and 7b-hydroxy-DHEA through a 7-oxo-intermediary. Both 7a-hydroxy-DHEA and 7b-hydroxy-DHEA competitively inhibited the cortisol oxidation, 7b-hydroxy-DHEA being seven times more potent in humans. Distinct species-specific routes of metabolism of DHEA and the interconversion of its metabolites obviate extrapolation of animal studies to humans. (PMID: 17467270, 12667489).
Harmalan is found in fruits. Harmalan is an alkaloid from Elaeagnus angustifolia (Russian olive
L-1,2,3,4-Tetrahydro-beta-carboline-3-carboxylic acid is found in garden tomato (var.). L-1,2,3,4-Tetrahydro-beta-carboline-3-carboxylic acid is widespread in many foodstuffs especially fruit juices, jams and fermented foods or beverages. L-1,2,3,4-Tetrahydro-beta-carboline-3-carboxylic acid is formed by Pictet-Spengler condensation of L-tryptophan and formaldehyde in nature or during food processin
Tellurium is a trace element that belongs chemically to the VIa group in the periodic chemical table that has the symbol Te and atomic number 52. Tellurium is a brittle silver-white metalloid which looks like tin, and is related to selenium and sulfur. Physiologically, it exists as an ion in the body. The ingestion of tellurium compounds has been known to be associated with a garlic-like odor of the breath, thus indicating that tellurium is absorbed by the gut, metabolized by tissues, and excreted through routes other than the feces. Little is known about the Te biological activity, particularly with respect to potential chemical interactions with Se-containing components in the organism. Tellurium is a non-competitive inhibitor of squalene epoxidase and has been associated with neuropathy. Late fetal stages of prenatal development appeared uniquely sensitive to organic tellurium exposure. All tellurium compounds are highly toxic. (PMID: 17873396, 15596254, 10048717).
4-Hydroxydiphenylamine is found in pomes. Metabolite of Diphenylamine <ht>FBK63-A</ht> in stored apple
8-Hydroxydaidzein is found in pulses. 8-Hydroxydaidzein is isolated from Streptomyces sp. OH-1049 cultured on soybean meal.
Celery flavour ingredien
Cucurbitacin B is found in bitter gourd. Together wth other cucurbitacins, is responsible for the bitter taste and toxic properties of spoilt cucumber
Ertapenem is only found in individuals that have used or taken this drug. It is a carbapenem antibiotic marketed by Merck as Invanz&reg. It is structurally very similar to meropenem in that it possess a 1-beta-methyl group. [Wikipedia]The bactericidal activity of ertapenem results from the inhibition of cell wall synthesis and is mediated through ertapenem binding to penicillin binding proteins (PBPs). In <i>Escherichia coli</i>, it has strong affinity toward PBPs 1a, 1b, 2, 3, 4 and 5 with preference for PBPs 2 and 3. Ertapenem is stable against hydrolysis by a variety of beta-lactamases, including penicillinases, and cephalosporinases and extended spectrum beta-lactamases. Ertapenem is hydrolyzed by metallo-beta-lactamases.
5-Methoxytryptamine, also known as mexamine or 5-MT, belongs to the class of organic compounds known as tryptamines and derivatives. Tryptamines and derivatives are compounds containing the tryptamine backbone, which is structurally characterized by an indole ring substituted at the 3-position by an ethanamine. It is biosynthesized via the deacetylation of melatonin in the pineal gland. 5-MT acts as a full agonist at the 5-HT1, 5-HT2, 5-HT4, 5-HT6, and 5-HT7 receptors. 5-Methoxytryptamine exists in all living organisms, ranging from bacteria to humans. Its affinity for the 5-HT5A receptor is unknown. It has no affinity for the 5-HT3 receptor and is affinity for the 5-HT1E receptor is very weak in comparison to the other 5-HT1 receptors. 5-MT has been shown to occur naturally in the body in low levels.
Myricitrin is found in black walnut. Myricitrin is a chemical compound. It can be isolated from the root bark of Myrica cerifera (Bayberry, a small tree native to North America)
Trospium is only found in individuals that have used or taken this drug. It is a urinary antispasmodic. It is sold under the brand name Sanctura in the US, and as Trosec in Canada. [Wikipedia]Trospium antagonizes the effect of acetylcholine on muscarinic receptors in cholinergically innervated organs. Its parasympatholytic action reduces the tonus of smooth muscle in the bladder.
Doxycycline is only found in individuals that have used or taken this drug. It is a synthetic tetracycline derivative with similar antimicrobial activity. Animal studies suggest that it may cause less tooth staining than other tetracyclines. It is used in some areas for the treatment of chloroquine-resistant falciparum malaria (malaria, falciparum). [PubChem]Doxycycline, like minocycline, is lipophilic and can pass through the lipid bilayer of bacteria. Doxycycline reversibly binds to the 30 S ribosomal subunits and possibly the 50S ribosomal subunit(s), blocking the binding of aminoacyl tRNA to the mRNA and inhibiting bacterial protein synthesis. Doxycycline prevents the normal function of the apicoplast of Plasmodium falciparum, a malaria causing organism.
1-Hexanol is an organic alcohol with a six carbon chain and a condensed structural formula of CH3(CH2)5OH. This colorless liquid is slightly soluble in water, but miscible with ether and ethanol. Two additional straight chain isomers of 1-hexanol exist, 2-hexanol and 3-hexanol, both of which differ by the location of the hydroxyl group. Many isomeric alcohols have the formula C6H13OH. 1-hexanol is believed to be a component of the odour of freshly mown grass. It is used in the perfume industry.
Adapalene is a topical retinoid primarily used in the treatment of acne and is also used (off-label) to treat keratosis pilaris as well as other skin conditions. It is currently marketed by Galderma under the trade names Differin in some countries, and Adaferin in India. [Wikipedia]
Capecitabine is an orally-administered chemotherapeutic agent used in the treatment of metastatic breast and colorectal cancers. Capecitabine is a prodrug, that is enzymatically converted to fluorouracil (antimetabolite) in the tumor, where it inhibits DNA synthesis and slows growth of tumor tissue.
Fungicide especies for protection of potatoes and tomatoes. [Ethylenebis(dithiocarbamato)]manganese is found in garden tomato and potato.
Kojic acid is a synthetic intermediate for production of food additives. It has been found to be a metabolite in Aspergillus (Hugo Vanden Bossche, D.W.R. Mackenzie and G. Cauwenbergh. Aspergillus and Aspergillosis, 1987).
6-Methylcoumarin is used as a food additive [EAFUS] ("EAFUS: Everything Added to Food in the United States. [http://www.eafus.com/]")
Pelargonidin-3,5-diglucoside is slightly soluble (in water) and a very weakly acidic compound (based on its pKa). Pelargonidin-3,5-diglucoside can be found in a number of food items such as mustard spinach, tartary buckwheat, catjang pea, and garden cress, which makes pelargonidin-3,5-diglucoside a potential biomarker for the consumption of these food products.
3-Hydroxy-carbofuran is a metabolite of Carbofuran in plants, insects and mammals.
This compound belongs to the family of Fluorenes. These are compounds containing a fluorene moiety, which consists of two benzene rings connected through either a cyclopentane, cyclopentene, or cyclopenta-1,3-diene.
Ascladiol is found in cereals and cereal products. Toxin from Aspergillus clavatus in wheat flou
Mono-(3-carboxypropyl) phthalate is also known as mono(3-carboxypropyl) phthalic acid. It is a non-specific metabolite of several phthalates, a metabolite of mono-n-butyl phthalate (MnBP), a secondary metabolite of di-n-butyl phthalate (DnBP), a metabolite of mono-n-octyl phthalate (MnOP), and a secondary metabolite of di-n-octyl phthalate (DnOP). It is classified as a member of the benzoic acid esters. Benzoic acid esters are ester derivatives of benzoic acid. Mono(3-carboxypropyl) phthalate is considered to be slightly soluble (in water) and acidic. (ChemoSummarizer)
Safflomin A is found in fats and oils. Safflomin A is a pigment from safflower (Carthamus tinctorius
Kaempferide is found in cloves. Kaempferide is isolated from roots of Alpinia officinarum (lesser galangal).
trans-Piceid is found in alcoholic beverages. trans-Piceid is present in grapeskins and red wine. It is isolated from Polygonum cuspidatum (Japanese knotweed).Piceid is a stilbenoid glucoside and is a major resveratrol derivative in grape juices
Demethoxycurcumin is found in beverages. Demethoxycurcumin is isolated from Curcuma zedoaria (zedoary), Curcuma longa (turmeric), Curcuma xanthorrhiza (Java turmeric).
2,4-Dodecadienoic acid pyrrolidide is found in herbs and spices. 2,4-Dodecadienoic acid pyrrolidide is a constituent of pepper (Piper nigrum) (Piperaceae).
Penbutolol is only found in individuals that have used or taken this drug. It is a medication in the class of beta blockers, used in the treatment of high blood pressure. [Wikipedia]Penbutolol competes with adrenergic neurotransmitters such as catecholamines for binding at beta(1)-adrenergic receptors in the heart and vascular smooth muscle and beta(2)-receptors in the bronchial and vascular smooth muscle. Beta(1)-receptor blockade results in a decrease in resting and exercise heart rate and cardiac output, a decrease in both systolic and diastolic blood pressure, and, possibly, a reduction in reflex orthostatic hypotension.
N-Desmethylvenlafaxine is a metabolite of venlafaxine (brand name: Effexor or Efexor). Venlafaxine is a bicyclic antidepressant and is usually categorized as a serotonin-norepinephrine reuptake inhibitor (SNRI), but it has been referred to as a serotonin-norepinephrine-dopamine reuptake inhibitor. It works by blocking the transporter reuptake proteins for key neurotransmitters affecting mood, thereby leaving more active neurotransmitters in the synapse.
Chlorin E6 (chlorin(e6)) is a photosensitizer used in photodynamic therapy. Photodynamic therapy (PDT) is a form of phototherapy using nontoxic light-sensitive compounds that are exposed selectively to light, whereupon they become toxic to targeted malignant and other diseased cells. PDT has proven ability to kill microbial cells including bacteria, fungi and viruses. PDT is popularly used in treating acne. It is used clinically to treat a wide range of medical conditions, including wet age-related macular degeneration and malignant cancers, and is recognised as a treatment strategy which is both minimally invasive and minimally toxic.  A photosensitizer is a chemical compound that can be promoted to an excited state upon absorption light and undergo intersystem crossing with oxygen to produce singlet oxygen. This species rapidly attacks any organic compounds it encounters, thus being highly cytotoxic. A wide array of photosensitizers for PDT exist. They can be divided into porphyrins, chlorophylls and dyes. Some examples include aminolevulinic acid (ALA), Silicon Phthalocyanine Pc 4, m-tetrahydroxyphenylchlorin (mTHPC), and mono-L-aspartyl chlorin e6 (NPe6). (Wikipedia)
Cholesteryl eicosatrienoic acid is a cholesteryl ester. A cholesteryl ester is an ester of cholesterol. Fatty acid esters of cholesterol constitute about two-thirds of the cholesterol in the plasma. Cholesterol is a sterol (a combination steroid and alcohol) and a lipid found in the cell membranes of all body tissues, and transported in the blood plasma of all animals. The accumulation of cholesterol esters in the arterial intima (the innermost layer of an artery, in direct contact with the flowing blood) is a characteristic feature of atherosclerosis. Atherosclerosis is a disease affecting arterial blood vessels. It is a chronic inflammatory response in the walls of arteries, in large part to the deposition of lipoproteins (plasma proteins that carry cholesterol and triglycerides). Cholesteryl eicosatrienoic acid has been found in triglycerides-rich cells such as monocyte-derived macrophages. Eicosatrienoic acid (ETrA) is a minor fatty acid in essential fatty acid (EFA)-sufficient healthy subjects but is found at increased levels in EFA deficiency; ETrA is present at up to 20% total fatty acids in plasma lipid in the triglyceride, cholesterol ester, and phospholipid fractions, and accumulates to substantial levels in phospholipids. (PMID: 9162758, 8869885).
LysoPC(22:6(4Z,7Z,10Z,13Z,16Z,19Z)) is a lysophospholipid (LyP). It is a monoglycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. Lysophosphatidylcholines can have different combinations of fatty acids of varying lengths and saturation attached at the C-1 (sn-1) position. Fatty acids containing 16, 18 and 20 carbons are the most common. LysoPC(22:6(4Z,7Z,10Z,13Z,16Z,19Z)), in particular, consists of one chain of docosahexaenoic acid at the C-1 position. The docosahexaenoic acid moiety is derived from fish oils. Lysophosphatidylcholine is found in small amounts in most tissues. It is formed by hydrolysis of phosphatidylcholine by the enzyme phospholipase A2, as part of the de-acylation/re-acylation cycle that controls its overall molecular species composition. It can also be formed inadvertently during extraction of lipids from tissues if the phospholipase is activated by careless handling. In blood plasma significant amounts of lysophosphatidylcholine are formed by a specific enzyme system, lecithin:cholesterol acyltransferase (LCAT), which is secreted from the liver. The enzyme catalyzes the transfer of the fatty acids of position sn-2 of phosphatidylcholine to the free cholesterol in plasma, with formation of cholesterol esters and lysophosphatidylcholine. Lysophospholipids have a role in lipid signaling by acting on lysophospholipid receptors (LPL-R). LPL-R's are members of the G protein-coupled receptor family of integral membrane proteins.
LysoPE(0:0/22:6(4Z,7Z,10Z,13Z,16Z,19Z)) is a lysophosphatidylethanolamine or a lysophospholipid. The term 'lysophospholipid' (LPL) refers to any phospholipid that is missing one of its two O-acyl chains. Thus, LPLs have a free alcohol in either the sn-1 or sn-2 position. The prefix 'lyso-' comes from the fact that lysophospholipids were originally found to be hemolytic however it is now used to refer generally to phospholipids missing an acyl chain. LPLs are usually the result of phospholipase A-type enzymatic activity on regular phospholipids such as phosphatidylcholine or phosphatidic acid, although they can also be generated by the acylation of glycerophospholipids or the phosphorylation of monoacylglycerols. Some LPLs serve important signaling functions such as lysophosphatidic acid. Lysophosphatidylethanolamines (LPEs) can function as plant growth regulators with several diverse uses. (LPEs) are approved for outdoor agricultural use to accelerate ripening and improve the quality of fresh produce. They are also approved for indoor use to preserve stored crops and commercial cut flowers. As a breakdown product of phosphatidylethanolamine (PE), LPE is present in cells of all organisms.
PE(16:0/18:2(9Z,12Z)) is a phosphatidylethanolamine (PE or GPEtn). It is a glycerophospholipid in which a phosphorylethanolamine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphoethanolamines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PE(16:0/18:2(9Z,12Z)), in particular, consists of one chain of palmitic acid at the C-1 position and one chain of linoleic acid at the C-2 position. The palmitic acid moiety is derived from fish oils, milk fats, vegetable oils and animal fats, while the linoleic acid moiety is derived from seed oils. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PEs are neutral zwitterions at physiological pH. They mostly have palmitic or stearic acid on carbon 1 and a long chain unsaturated fatty acid (e.g. 18:2, 20:4 and 22:6) on carbon 2. PE synthesis can occur via two pathways. The first requires that ethanolamine be activated by phosphorylation and then coupled to CDP. The ethanolamine is then transferred from CDP-ethanolamine to phosphatidic acid to yield PE. The second involves the decarboxylation of PS.
Ethyl carbamate, also known as aethylurethan or uretan, belongs to the class of organic compounds known as carboximidic acids and derivatives. Carboximidic acids and derivatives are compounds containing a carboximidic group, with the general formula R-C(=NR1)OR2. Ethyl carbamate has been detected, but not quantified, in alcoholic beverages. This could make ethyl carbamate a potential biomarker for the consumption of these foods. Ethyl carbamate is formally rated as a probable carcinogen (by IARC 2A) and is also a potentially toxic compound. It is readily absorbed from the gastrointestinal tract and the skin. It also tends to induce specific mutations in the Kras oncogene in codon 61 of exon 2 including A:T transversions and A-->G transitions in the second base and A-->T transversions in the third base. Urethane, formerly marketed as an inactive ingredient in Profenil injection, was determined to be carcinogenic and was removed from the Canadian, US, and UK markets in 1963. If necessary, the person should shower and change contaminated clothing and shoes, and then must seek medical attention. In case of contact with eyes, irrigate opened eyes for several minutes under running water. Metabolism is mediated by cytochrome P450 2E1.
L-Ribo-2-Amino-4-hydroxy-3-methylpentanoic acid is found in herbs and spices. L-Ribo-2-Amino-4-hydroxy-3-methylpentanoic acid is a major constituent of Trigonella foenum-graecum (fenugreek
Ethylmethylacetic acid, also known as alpha-methyl butyric acid or a-methyl butyrate, belongs to the class of organic compounds known as methyl-branched fatty acids. These are fatty acids with an acyl chain that has a methyl branch. Usually, they are saturated and contain only one or more methyl group. However, branches other than methyl may be present. Ethylmethylacetic acid is a very hydrophobic molecule, practically insoluble in water, and relatively neutral.
Phenol, is a toxic, colourless crystalline solid with a sweet tarry odor that resembles a hospital smell. It is commonly used as an antiseptic and disinfectant. It is active against a wide range of micro-organisms including some fungi and viruses, but is only slowly effective against spores. It has been used to disinfect skin and to relieve itching. Phenol is also used in the preparation of cosmetics including sunscreens, hair dyes, and skin lightening preparations. It is also used in the production of drugs (it is the starting material in the industrial production of aspirin), weedkillers, and synthetic resins. Phenol can be found in areas with high levels of motor traffic, therefore, people living in crowded urban areas are frequently exposed to traffic-derived phenol vapor. The average (mean +/- SD) phenol concentration in urine among normal individuals living in urban areas is 7.4 +/- 2.2 mg/g of creatinine. Exposure of the skin to concentrated phenol solutions causes chemical burns which may be severe; in laboratories where it is used, it is usually recommended that polyethylene glycol solution is kept available for washing off splashes. Notwithstanding the effects of concentrated solutions, it is also used in cosmetic surgery as an exfoliant, to remove layers of dead skin (Wikipedia). In some bacteria phenol can be directly synthesized from tyrosine via the enzyme tyrosine phenol-lyase [EC:4.1.99.2]. It can be produced by Escherichia and Pseudomonas. Phenol has been identified as a uremic toxin according to the European Uremic Toxin Working Group (PMID: 22626821).
delta-Hexanolactone is the lactone of 5-hydroxyhexanoic acid. Lactones are internal esters that exist in equilibrium between their closed (lactone) and open (hydroxy acid) forms in an aqueous environment. The lactone/hydroxy acid ratio at equilibrium is pH-dependent, with the closed form being favored at lower pH values, and can be greatly influenced by structural features of the lactone such as the ring size, substituents on the ring and the presence of double bonds within the ring. Many drugs and endogenous compounds are lactones or hydroxy acids and an enzyme capable of catalyzing the interchange between the open and closed forms in vivo could have pronounced effects upon their biological activity and/or distribution. delta-Hexanolactone is the substrate of paraoxonases (PON) in humans. Human PON1 hydrolyzes over 30 different lactones (cyclic esters) and catalyzes the reverse reaction (lactonization) of a broad range of hydroxy acids. Hydroxy acid lactonization or lactone hydrolysis is catalyzed until equilibrium between the open and closed forms is reached (PMID: 15772423, 12963475, 12963475).
(E)-4-Octenoic acid is used as a food additive [EAFUS] ("EAFUS: Everything Added to Food in the United States. [http://www.eafus.com/]").
Isonicotinic acid is a metabolite of isoniazid. Isonicotinic acid is an organic compound with a carboxyl group on a pyridine ring. It is an isomer of nicotinic acid. The carboxyl group for isonicotinic acid is on the 4-position instead of the 3-position for nicotinic acid (Wikipedia).
1-piperidine carboxylic acid is classified as a member of the piperidinecarboxylic acids. Piperidinecarboxylic acids are compounds containing a piperidine ring which bears a carboxylic acid group. 1-piperidine carboxylic acid is considered to be a soluble (in water) and a weak acidic compound. 1-piperidine carboxylic acid can be found in humans.
3-Methylglutaconic acid is an intermediate (as the CoA thioester) in the leucine degradative pathway as well as the mevalonate shunt, a pathway that links isoprenoid metabolism with mitochondrial acetyl-CoA metabolism (PMID: 7603789). 3-methylglutaconyl-CoA hydratase is involved in the metabolism process of 3-methylglutaconic acid. When present in sufficiently high levels, 3-methylglutaconic acid can act as an acidogen and a metabotoxin. An acidogen is an acidic compound that induces acidosis, which has multiple adverse effects on many organ systems. A metabotoxin is an endogenously produced metabolite that causes adverse health effects at chronically high levels. Chronically high levels of 3-methylglutaconic acid are associated with at least five inborn errors of metabolism including 3-hydroxy-3-methylglutaryl-CoA lyase deficiency, 3-methylglutaconic aciduria type I, 3-methylglutaconic aciduria type III, 3-methylglutaconic aciduria type IV, and guanidinoacetate methyltransferase deficiency (GAMT deficiency). 3-Methylglutaconic acid is an organic acid. Abnormally high levels of organic acids in the blood (organic acidemia), urine (organic aciduria), the brain, and other tissues lead to general metabolic acidosis. Acidosis typically occurs when arterial pH falls below 7.35. In infants with acidosis, the initial symptoms include poor feeding, vomiting, loss of appetite, weak muscle tone (hypotonia), and lack of energy (lethargy). These can progress to heart, liver, and kidney abnormalities, seizures, coma, and possibly death. These are also the characteristic symptoms of the untreated IEMs mentioned above. Many affected children with organic acidemias experience intellectual disability or delayed development. In adults, acidosis or acidemia is characterized by headaches, confusion, feeling tired, tremors, sleepiness, and seizures.
Nor-psi-tropine is found in fruits. Nor-psi-tropine is an alkaloid from the fruit of Morus alba (white mulberry
Induces formation of Epstein Barr Virus lymphocytes immediately following infection. (282990).
Hypogeic acid is a fatty acids found in human milk Approximately 50% of the dietary calories in human milk are supplied to new-borns as fat. More than 98% of this milk fat is in the form of triglycerides, which contain fatty acid glycerol esters. Fatty acid composition in human milk changes in colostrum, transitional milk and mature milk. Knowledge of fatty acid composition of human milk is of importance for the manufacture of infant formulas, determination of the influence of diet in fatty acid composition of human milk and changes in composition with lactation. (CAN 136:246580, AN 2002:67899).
2-Hydroxyadipic acid is a hydroxy-dicarboxylic acid formed by the reduction of 2-ketoadipic acid. A deficiency of 2-ketoadipic dehydrogenase causes 2-ketoadipic acidemia or 2-oxoadipic acidemia (OMIM: 245130), a genetic disorder characterized by accumulation and excretion of 2-hydroxyadipic acid (with 2-ketoadipic and 2-aminoadipic) (OMMBID - The Online Metabolic and Molecular Bases of Inherited Disease, CH.95). When present in sufficiently high levels, 2-hydroxyadipic acid can act as an acidogen and a metabotoxin. An acidogen is an acidic compound that induces acidosis, which has multiple adverse effects on many organ systems. A metabotoxin is an endogenously produced metabolite that causes adverse health effects at chronically high levels. Chronically high levels of 2-hydroxyadipic acid are associated with at least three inborn errors of metabolism including  2-oxoadipic acidemia, 2-aminoadipic aciduria, and 2-oxoadipic aciduria. 2-Hydroxyadipic acid is an organic acid. Abnormally high levels of organic acids in the blood (organic acidemia), urine (organic aciduria), the brain, and other tissues lead to general metabolic acidosis. Acidosis typically occurs when arterial pH falls below 7.35. In infants with acidosis, the initial symptoms include poor feeding, vomiting, loss of appetite, weak muscle tone (hypotonia), and lack of energy (lethargy). These can progress to heart abnormalities, kidney abnormalities, liver damage, seizures, coma, and possibly death. These are also the characteristic symptoms of the untreated IEMs mentioned above. Many affected children with organic acidemias experience intellectual disability or delayed development. In adults, acidosis or acidemia is characterized by headaches, confusion, feeling tired, tremors, sleepiness, and seizures.
Suberic acid, also octanedioic acid, is a dicarboxylic acid, with formula C6H12(COOH)2. It is present in the urine of patients with fatty acid oxidation disorders (PMID 10404733). A metabolic breakdown product derived from oleic acid. Elevated levels of this unstaruated dicarboxylic acid are found in individuals with medium-chain acyl-CoA dehydrogenase deficiency (MCAD). Suberic acid is also found to be associated with carnitine-acylcarnitine translocase deficiency, malonyl-Coa decarboxylase deficiency, which are also inborn errors of metabolism.
Ethyl nicotinate, also known as mucotherm, belongs to the class of organic compounds known as pyridinecarboxylic acids. Pyridinecarboxylic acids are compounds containing a pyridine ring bearing a carboxylic acid group. ethyl nicotinate has been detected, but not quantified, in sweet oranges. This could make ethyl nicotinate a potential biomarker for the consumption of these foods.
trans-Ferulic acid is a highly abundant phenolic phytochemical which is present in plant cell walls. Ferulic acid is a phenolic acid that can be absorbed by the small intestine and excreted through the urine. It is one of the most abundant phenolic acids in plants, varying from 5 g/kg in wheat bran to 9 g/kg in sugar-beet pulp and 50 g/kg in corn kernel. It occurs primarily in seeds and leaves both in its free form (albeit rarely) and covalently linked to lignin and other biopolymers. It is usually found as ester cross-links with polysaccharides in the cell wall, such as arabinoxylans in grasses, pectin in spinach and sugar beet, and xyloglucans in bamboo. It also can cross-link with proteins. Due to its phenolic nucleus and an extended side chain conjugation (carbohydrates and proteins), it readily forms a resonance-stabilized phenoxy radical which accounts for its potent antioxidant potential. Food supplementation with curcumin and ferulic acid is considered a nutritional approach to reducing oxidative damage and amyloid pathology in Alzheimer disease (PMID:17127365, 1398220, 15453708, 9878519). Ferulic acid can be found in Pseudomonas and Saccharomyces (PMID:8395165).
cis-4-Decenoic acid, also known as obtusilic acid, belongs to the class of organic compounds known as medium-chain fatty acids. These are fatty acids with an aliphatic tail that contains between 4 and 12 carbon atoms. cis-4-Decenoic acid is a very hydrophobic molecule, practically insoluble (in water), and relatively neutral. 4-Decenoic acid (and other intermediates of unsaturated fatty acid oxidation) has been found in increased amounts in liver, skeletal muscle, and heart obtained post mortem from patients with medium-chain acyl-CoA dehydrogenase deficiency (MCADD), multiple acyl-CoA dehydrogenase deficiency (MADD), and very-long-chain acyl-CoA dehydrogenase deficiency (VLCADD) (PMID: 11486898).
Ethylparaben, also known as e-214 or aseptin a, belongs to the class of organic compounds known as p-hydroxybenzoic acid alkyl esters. These are aromatic compounds containing a benzoic acid, which is esterified with an alkyl group and para-substituted with a hydroxyl group. It is used as an antifungal preservative. Sodium ethyl para-hydroxybenzoate, the sodium salt of ethylparaben, has the same uses and is given the E number E215. Ethylparaben is a drug. Its formula is HO-C6H4-CO-O-CH2CH3. Ethylparaben is a mild and phenolic tasting compound. ethylparaben has been detected, but not quantified, in alcoholic beverages. This could make ethylparaben a potential biomarker for the consumption of these foods. Ethylparaben (ethyl para-hydroxybenzoate) is the ethyl ester of p-hydroxybenzoic acid. Ethylparaben is a potentially toxic compound. As a food additive, it has E number E214.
N-methylnicotinamide is a pyridinecarboxamide that is nicotinamide in which one of the amide hydrogens is substituted by a methyl group. N-methylnicotinamide is a metabolite of niacin (or nicotinamide) and is commonly found in human urine. However low levels of urinary excretion of N-methylnicotinamide indicates niacin deficiency. (PMID:16207585). In patients with liver cirrhosis nicotinamide methylation is increased leading to a rise in urinary N-methylnicotinamide. The hyperfunction of this methylating pathway might play a protective role against the toxic effect of intracellular accumulation of nicotinamide deriving from the catabolic state of cirrhosis. N-methylnicotinamide is known to inhibit choline transport and reduce choline clearance out of the brain. N-methylnicotinamide has been found to be a microbial metabolite.
3-Hydroxyphenylacetic acid is a rutin metabolite and an antioxidant. It has a protective biological activity in human. It is a substrate of enzyme 4-hydroxyphenylacetate 3-monooxygenase [EC 1.14.13.3] in the pathway tyrosine metabolism (KEGG, PMID 155437). 3-Hydroxyphenylacetic acid is found to be associated with phenylketonuria, which is an inborn error of metabolism. It is also a marker of gut Clostridium species. Higher levels are associated with higher levels of Clostridia (PMID: 27123458). 3-Hydroxyphenylacetic acid can also be found in Klebsiella (PMID: 1851804).
Clemastine is only found in individuals that have used or taken this drug. It is an ethanolamine-derivative, first generation histamine H1 antagonist used in hay fever, rhinitis, allergic skin conditions, and pruritus. It causes drowsiness. [PubChem]Clemastine is a selective histamine H1 antagonist and binds to the histamine H1 receptor. This blocks the action of endogenous histamine, which subsequently leads to temporary relief of the negative symptoms brought on by histamine.
5-Aminopentanoic acid (or 5-aminovalerate) is a lysine degradation product.  It can be produced both endogenously or through bacterial catabolism of lysine.  5-aminovalerate is formed via the following multi-step reaction: L-lysine leads to cadverine leads to L-piperideine leads 5-aminovalerate (PMID:405455).  In other words it is a metabolite of cadaverine which is formed via the intermediate, 1-piperideine (PMID:6436440).  Cadaverine is a foul-smelling diamine compound produced by protein hydrolysis during putrefaction of animal tissue. High levels of 5-aminovalerate in biofluids may indicate bacterial overgrowth or endogenous tissue necrosis.  In most cases  endogenous 5-aminovalerate is thought to be primarily a microbial metabolite produced by the gut or oral microflora, although it can be produced endogenously.  5-aminovalerate is a normal metabolite present in human saliva, with a tendency to elevated concentration in patients with chronic periodontitis. Bacterial contamination and decomposition of salivary proteins is primarily responsible for elevated salivary levels (PMID 3481959). Beyond being a general waste product, 5-aminovalerate is also believed to act as a methylene homologue of gamma-aminobutyric acid (GABA) and functions as a weak GABA agonist (PMID:4031870). It is also known as an antifibrinolytic amino acid analog and so it functions as a weak inhibitor of the blood clotting pathway (PMID:6703712). 5- aminovalerate is an in vivo substrate of 4-aminobutyrate:2-oxoglutarate aminotransferase (PMID:4031870). It can be found in Corynebacterium (PMID:27717386).
Shikimic acid, more commonly known as its anionic form shikimate, is a cyclohexene, a cyclitol and a cyclohexanecarboxylic acid. It is an important biochemical intermediate in plants and microorganisms. Its name comes from the Japanese flower shikimi (the Japanese star anise, Illicium anisatum), from which it was first isolated. Shikimic acid is a precursor for: the aromatic amino acids phenylalanine and tyrosine; indole, indole derivatives and tryptophan; many alkaloids and other aromatic metabolites; tannins; and lignin. In pharmaceutical industry, shikimic acid from chinese star anise is used as a base material for production of Tamiflu (oseltamivir). Although shikimic acid is present in most autotrophic organisms, it is a biosynthetic intermediate and generally found in very low concentrations.
Benzyl benzoate, also known as benylate or benylic acid, belongs to the class of organic compounds known as benzoic acid esters. These are ester derivatives of benzoic acid. Benzyl benzoate is an extremely weak basic (essentially neutral) compound (based on its pKa). Benzyl benzoate is a faint, sweet, and almond tasting compound. Outside of the human body, benzyl benzoate is found, on average, in the highest concentration within Ceylon cinnamon. Benzyl benzoate has also been detected, but not quantified in, several different foods, such as fennels, garden tomato, annual wild rice, amaranths, and horseradish tree. This could make benzyl benzoate a potential biomarker for the consumption of these foods. Benzyl benzoate is one of the older preparations used to treat scabies. Scabies is a skin infection caused by the mite Sarcoptes scabiei. It is characterized by severe itching (particularly at night), red spots, and may lead to a secondary infection. Benzyl benzoate is lethal to this mite and is therefore useful in the treatment of scabies. It is also used to treat lice infestations of the head and body.
Palmitic amide is a primary fatty acid amide coming from Palmitic acid (C16:0). Primary fatty acid amides (R-CO-NH2) is a class of compounds that have only recently been isolated and characterized from biological sources. Key questions remain regarding how these lipid amides are produced and degraded in biological systems. (PMID 15282088). Fatty acid amides lies in the competition with endocannabinoids for binding to the active site of the enzyme and thus in increasing the concentration of endocannabinoids, by preventing their degradation.It can be used as a marker of disease in subjects, e.g. first-onset, drug-naive patients; the disease may be, for example, schizophrenia, paranoid schizophrenia or an affective disorder.The metabolic network of primary fatty acid amides is more severely altered in affective disorder than in first onset, paranoid schizophrenia.
2-Ethylpyrazine, also known as fema 3281 or moldin, belongs to the class of organic compounds known as pyrazines. Pyrazines are compounds containing a pyrazine ring, which is a six-member aromatic heterocycle, that consists of two nitrogen atoms (at positions 1 and 4) and four carbon atoms. 2-Ethylpyrazine is a bitter, cocoa, and musty tasting compound. 2-Ethylpyrazine has been detected, but not quantified, in several different foods, such as asparagus, pulses, cocoa and cocoa products, cereals and cereal products, and tortilla chips.
Cucumopine, also known as mikimopine or cucumopine, (4r-cis)-isomer, is a member of the class of compounds known as L-alpha-amino acids. L-alpha-amino acids are alpha amino acids which have the L-configuration of the alpha-carbon atom. Cucumopine is slightly soluble (in water) and a moderately acidic compound (based on its pKa). Cucumopine can be found in carrot and wild carrot, which makes cucumopine a potential biomarker for the consumption of these food products.
5-Hydroxyindoleacetaldehyde, also known as 5-HIAL, belongs to the class of organic compounds known as hydroxyindoles. These are organic compounds containing an indole moiety that carries a hydroxyl group. Within humans, 5-hydroxyindoleacetaldehyde participates in a number of enzymatic reactions. In particular, 5-hydroxyindoleacetaldehyde can be biosynthesized from serotonin through its interaction with the enzyme kynurenine 3-monooxygenase. In humans, 5-hydroxyindoleacetaldehyde is involved in tryptophan metabolism. Outside of the human body, 5-hydroxyindoleacetaldehyde has been detected, but not quantified in, several different foods, such as garden rhubarbs, black radish, oriental wheat, garden tomato, and wild leeks. This could make 5-hydroxyindoleacetaldehyde a potential biomarker for the consumption of these foods. 5-Hydroxyindoleacetaldehyde is a biogenic aldehyde of serotonin derived from the action of monoamine oxidase (MAO) (PMID: 11306106, 2470392).
Prolylglycine is a dipeptide composed of proline and glycine. It is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis. It is found in urine (PMID: 3782411).
CE(14:0) is a cholesterol fatty acid ester or simply a cholesterol ester (CE). Cholesterol esters are cholesterol molecules with long-chain fatty acids linked to the hydroxyl group. They are much less polar than free cholesterol and appear to be the preferred form for transport in plasma and for storage. Cholesterol esters do not contribute to membranes but are packed into intracellular lipid particles or lipoprotein particles. Because of the mechanism of synthesis, plasma cholesterol esters tend to contain relatively high proportions of C18 fatty acids. Cholesterol esters are major constituents of the adrenal glands and they also accumulate in the fatty lesions of atherosclerotic plaques. Cholesterol esters are also major constituents of the lipoprotein particles carried in blood (HDL, LDL, VLDL). The cholesterol esters in high-density lipoproteins (HDL) are synthesized largely by transfer of fatty acids to cholesterol from position sn-2 (or C-2) of phosphatidylcholine catalyzed by the enzyme lecithin cholesterol acyl transferase (LCAT). The enzyme also promotes the transfer of cholesterol from cells to HDL. As cholesterol esters accumulate in the lipoprotein core, cholesterol is removed from its surface thus promoting the flow of cholesterol from cell membranes into HDL. This in turn leads to morphological changes in HDL, which grow and become spherical. Subsequently, cholesterol esters are transferred to the other lipoprotein fractions LDL and VLDL, a reaction catalyzed by cholesteryl ester transfer protein. Another enzyme, acyl-CoA:cholesterol acyltransferase (ACAT) synthesizes cholesterol esters from CoA esters of fatty acids and cholesterol. Cholesterol ester hydrolases liberate cholesterol and free fatty acids when required for membrane and lipoprotein formation, and they also provide cholesterol for hormone synthesis in adrenal cells.
CE(16:0), also known as cholesteryl palmitic acid, is a cholesteryl ester. A cholesteryl ester is an ester of cholesterol. Fatty acid esters of cholesterol constitute about two-thirds of the cholesterol in the plasma. Cholesterol is a sterol (a combination of steroid and alcohol) and a lipid found in the cell membranes of all body tissues and transported in the blood plasma of all animals. The accumulation of cholesterol esters in the arterial intima (the innermost layer of an artery, in direct contact with the flowing blood) is a characteristic feature of atherosclerosis. Atherosclerosis is a disease affecting arterial blood vessels. It is a chronic inflammatory response in the walls of arteries, in large part to the deposition of lipoproteins (plasma proteins that carry cholesterol and triglycerides). CE(16:0) may also accumulate in hereditary hypercholesterolemia, an inborn error of metabolism. Cholesteryl palmitate is one of the four important lipids found in the tear film. Amniotic fluid cholesteryl palmitate, as measured by thin-layer chromatography, appears to be a very sensitive and specific predictor for the risk of respiratory distress syndrome (RDS) in newborns of normal pregnancies (PMID:3405552, 16922549).
CE(16:1(9Z)), also known as (Z)-cholesterol 9-hexadecenoate or 1-palmitoleoyl-cholesterol, is an important plasma cholesteryl ester. A cholesteryl ester is an ester of cholesterol. Fatty acid esters of cholesterol constitute about two-thirds of the cholesterol in the plasma. Cholesterol is a sterol (a combination steroid and alcohol) and a lipid found in the cell membranes of all body tissues and transported in the blood plasma of all animals. The accumulation of cholesterol esters in the arterial intima (the innermost layer of an artery, in direct contact with the flowing blood) is a characteristic feature of atherosclerosis. Atherosclerosis is a disease affecting arterial blood vessels. It is a chronic inflammatory response in the walls of arteries, in large part to the deposition of lipoproteins (plasma proteins that carry cholesterol and triglycerides). Cholesteryl palmitoleate is one of the two more prevalent esters that are a component of dehydroepiandrosterone fatty acid esters (DHEA-FA). DHEA-FA is formed from DHEA by lecithin-cholesterol acyltransferase, localized on high-density lipoprotein (HDL). Once DHEA-FA is formed, it is subsequently transferred to very low-density lipoprotein (VLDL) and low-density lipoprotein (LDL), like cholesteryl esters. Cholesteryl palmitoleate constitutes 20% of the total lipoidal pregnenolone (an important precursor steroid) in follicular fluid. The fatty acid components of the resulting lipoidal pregnenolone derivatives resemble those of cholesteryl esters formed in plasma by the enzymatic activity of lecithin–cholesterol acyltransferase (LCAT) (PMID: 2770299, 8943795). CE(16:1(9Z)) is considered to be practically insoluble (in water) and basic.
cholest-5-en-3beta-yl octadecanoate, also known as Cholest-5-en-3-b-yl stearic acid or 3beta-Octadecanoyloxycholest-5-ene, is classified as a member of the Cholesteryl esters. Cholesteryl esters are compounds containing an esterified cholestane moiety. cholest-5-en-3beta-yl octadecanoate is considered to be practically insoluble (in water) and basic.  cholest-5-en-3beta-yl octadecanoate is a sterol lipid molecule
Cholesteryl oleate is an ester of cholesterol. Fatty acid esters of cholesterol constitute about two-thirds of the cholesterol in the plasma. Cholesterol is a sterol (a combination steroid and alcohol) and a lipid found in the cell membranes of all body tissues, and transported in the blood plasma of all animals. The accumulation of cholesterol esters in the arterial intima (the innermost layer of an artery, in direct contact with the flowing blood) is a characteristic feature of atherosclerosis. Atherosclerosis is a disease affecting arterial blood vessels. It is a chronic inflammatory response in the walls of arteries, in large part to the deposition of lipoproteins (plasma proteins that carry cholesterol and triglycerides). Cholesteryl esters, formed by the esterification of cholesterol with long-chain fatty acids, on one hand, are the means by which cholesterol is transported through the blood by lipoproteins, on the other, the way cholesterol itself can be accumulated in the cells. (PMID: 15939411).
Cholesteryl linoleic acid is a cholesteryl ester. A cholesteryl ester is an ester of cholesterol. Fatty acid esters of cholesterol constitute about two-thirds of the cholesterol in the plasma. Cholesterol is a sterol (a combination steroid and alcohol) and a lipid found in the cell membranes of all body tissues, and transported in the blood plasma of all animals. The accumulation of cholesterol esters in the arterial intima (the innermost layer of an artery, in direct contact with the flowing blood) is a characteristic feature of atherosclerosis. Atherosclerosis is a disease affecting arterial blood vessels. It is a chronic inflammatory response in the walls of arteries, in large part to the deposition of lipoproteins (plasma proteins that carry cholesterol and triglycerides). Cholesteryl linoleate is contained in low density lipoprotein and atherosclerotic lesions. The oxidation products of cholesteryl linoleate may cause chronic inflammatory processes. (PMID 9684755, 11950694).
CE(18:3(9Z,12Z,15Z)) is a cholesterol fatty acid ester or simply a cholesterol ester (CE). Cholesterol esters are cholesterol molecules with long-chain fatty acids linked to the hydroxyl group. They are much less polar than free cholesterol and appear to be the preferred form for transport in plasma and for storage. Cholesterol esters do not contribute to membranes but are packed into intracellular lipid particles or lipoprotein particles. Because of the mechanism of synthesis, plasma cholesterol esters tend to contain relatively high proportions of C18 fatty acids. Cholesterol esters are major constituents of the adrenal glands and they also accumulate in the fatty lesions of atherosclerotic plaques. Cholesterol esters are also major constituents of the lipoprotein particles carried in blood (HDL, LDL, VLDL). The cholesterol esters in high-density lipoproteins (HDL) are synthesized largely by transfer of fatty acids to cholesterol from position sn-2 (or C-2) of phosphatidylcholine catalyzed by the enzyme lecithin cholesterol acyl transferase (LCAT). The enzyme also promotes the transfer of cholesterol from cells to HDL. As cholesterol esters accumulate in the lipoprotein core, cholesterol is removed from its surface thus promoting the flow of cholesterol from cell membranes into HDL. This in turn leads to morphological changes in HDL, which grow and become spherical. Subsequently, cholesterol esters are transferred to the other lipoprotein fractions LDL and VLDL, a reaction catalyzed by cholesteryl ester transfer protein. Another enzyme, acyl-CoA:cholesterol acyltransferase (ACAT) synthesizes cholesterol esters from CoA esters of fatty acids and cholesterol. Cholesterol ester hydrolases liberate cholesterol and free fatty acids when required for membrane and lipoprotein formation, and they also provide cholesterol for hormone synthesis in adrenal cells.
cholest-5-en-3beta-yl (11Z,14Z-eicosadienoate) is classified as a member of the Cholesteryl esters. Cholesteryl esters are compounds containing an esterified cholestane moiety. cholest-5-en-3beta-yl (11Z,14Z-eicosadienoate) is considered to be practically insoluble (in water) and basic.  cholest-5-en-3beta-yl (11Z,14Z-eicosadienoate) is a sterol lipid molecule
Cholesteryl eicosatrienoic acid is a cholesteryl ester. A cholesteryl ester is an ester of cholesterol. Fatty acid esters of cholesterol constitute about two-thirds of the cholesterol in the plasma. Cholesterol is a sterol (a combination steroid and alcohol) and a lipid found in the cell membranes of all body tissues, and transported in the blood plasma of all animals. The accumulation of cholesterol esters in the arterial intima (the innermost layer of an artery, in direct contact with the flowing blood) is a characteristic feature of atherosclerosis. Atherosclerosis is a disease affecting arterial blood vessels. It is a chronic inflammatory response in the walls of arteries, in large part to the deposition of lipoproteins (plasma proteins that carry cholesterol and triglycerides). Cholesteryl eicosatrienoic acid has been found in triglycerides-rich cells such as monocyte-derived macrophages. Eicosatrienoic acid (ETrA) is a minor fatty acid in essential fatty acid (EFA)-sufficient healthy subjects but is found at increased levels in EFA deficiency; ETrA is present at up to 20% total fatty acids in plasma lipid in the triglyceride, cholesterol ester, and phospholipid fractions, and accumulates to substantial levels in phospholipids. (PMID: 9162758, 8869885).
CE(20:4(5Z,8Z,11Z,14Z)) is a cholesterol fatty acid ester or simply a cholesterol ester (CE). Cholesterol esters are cholesterol molecules with long-chain fatty acids linked to the hydroxyl group. They are much less polar than free cholesterol and appear to be the preferred form for transport in plasma and for storage. Cholesterol esters do not contribute to membranes but are packed into intracellular lipid particles or lipoprotein particles. Because of the mechanism of synthesis, plasma cholesterol esters tend to contain relatively high proportions of C18 fatty acids. Cholesterol esters are major constituents of the adrenal glands and they also accumulate in the fatty lesions of atherosclerotic plaques. Cholesterol esters are also major constituents of the lipoprotein particles carried in blood (HDL, LDL, VLDL). The cholesterol esters in high-density lipoproteins (HDL) are synthesized largely by transfer of fatty acids to cholesterol from position sn-2 (or C-2) of phosphatidylcholine catalyzed by the enzyme lecithin cholesterol acyl transferase (LCAT). The enzyme also promotes the transfer of cholesterol from cells to HDL. As cholesterol esters accumulate in the lipoprotein core, cholesterol is removed from its surface thus promoting the flow of cholesterol from cell membranes into HDL. This in turn leads to morphological changes in HDL, which grow and become spherical. Subsequently, cholesterol esters are transferred to the other lipoprotein fractions LDL and VLDL, a reaction catalyzed by cholesteryl ester transfer protein. Another enzyme, acyl-CoA:cholesterol acyltransferase (ACAT) synthesizes cholesterol esters from CoA esters of fatty acids and cholesterol. Cholesterol ester hydrolases liberate cholesterol and free fatty acids when required for membrane and lipoprotein formation, and they also provide cholesterol for hormone synthesis in adrenal cells.
Cholesteryl docosatetraenoic acid is a cholesteryl ester. A cholesteryl ester is an ester of cholesterol. Fatty acid esters of cholesterol constitute about two-thirds of the cholesterol in the plasma. Cholesterol is a sterol (a combination steroid and alcohol) and a lipid found in the cell membranes of all body tissues, and transported in the blood plasma of all animals. The accumulation of cholesterol esters in the arterial intima (the innermost layer of an artery, in direct contact with the flowing blood) is a characteristic feature of atherosclerosis. Atherosclerosis is a disease affecting arterial blood vessels. It is a chronic inflammatory response in the walls of arteries, in large part to the deposition of lipoproteins (plasma proteins that carry cholesterol and triglycerides). Docosatetraenoic acid is one of the main polyunsaturated fatty acids (PUFA) present in the brain, a lipid-rich organ containing mostly complex polar phospholipids, sphingolipids, gangliosides and cholesterol. Cholesteryl docosatetraenoic acid has been found in triglycerides-rich cells such as monocyte-derived macrophages. Docosatetraenoic acid is increased in plasma in children with protein-calorie malnutrition (PCM). (PMID: 17392137, 10424250, 9162758).
PC(P-18:0/P-18:1(11Z)) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(P-18:0/P-18:1(11Z)), in particular, consists of one chain of plasmalogen 18:0 at the C-1 position and one chain of plasmalogen 18:1n7 at the C-2 position. The plasmalogen 18:0 moiety is derived from animal fats, liver and kidney, while the plasmalogen 18:1n7 moiety is derived from animal fats, liver and kidney. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.
LysoPC(20:1(11Z)) is a lysophospholipid (LyP). It is a monoglycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. Lysophosphatidylcholines can have different combinations of fatty acids of varying lengths and saturation attached at the C-1 (sn-1) position. Fatty acids containing 16, 18 and 20 carbons are the most common. LysoPC(20:1(11Z)), in particular, consists of one chain of eicosenoic acid at the C-1 position. The eicosenoic acid moiety is derived from vegetable oils and cod oils. Lysophosphatidylcholine is found in small amounts in most tissues. It is formed by hydrolysis of phosphatidylcholine by the enzyme phospholipase A2, as part of the de-acylation/re-acylation cycle that controls its overall molecular species composition. It can also be formed inadvertently during extraction of lipids from tissues if the phospholipase is activated by careless handling. In blood plasma significant amounts of lysophosphatidylcholine are formed by a specific enzyme system, lecithin:cholesterol acyltransferase (LCAT), which is secreted from the liver. The enzyme catalyzes the transfer of the fatty acids of position sn-2 of phosphatidylcholine to the free cholesterol in plasma, with formation of cholesterol esters and lysophosphatidylcholine. Lysophospholipids have a role in lipid signaling by acting on lysophospholipid receptors (LPL-R). LPL-R's are members of the G protein-coupled receptor family of integral membrane proteins.
LysoPC(20:3(8Z,11Z,14Z)) is a lysophospholipid (LyP). It is a monoglycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. Lysophosphatidylcholines can have different combinations of fatty acids of varying lengths and saturation attached at the C-1 (sn-1) position. Fatty acids containing 16, 18 and 20 carbons are the most common. LysoPC(20:3(8Z,11Z,14Z)), in particular, consists of one chain of homo-g-linolenic acid at the C-1 position. The homo-g-linolenic acid moiety is derived from fish oils, liver and kidney. Lysophosphatidylcholine is found in small amounts in most tissues. It is formed by hydrolysis of phosphatidylcholine by the enzyme phospholipase A2, as part of the de-acylation/re-acylation cycle that controls its overall molecular species composition. It can also be formed inadvertently during extraction of lipids from tissues if the phospholipase is activated by careless handling. In blood plasma significant amounts of lysophosphatidylcholine are formed by a specific enzyme system, lecithin:cholesterol acyltransferase (LCAT), which is secreted from the liver. The enzyme catalyzes the transfer of the fatty acids of position sn-2 of phosphatidylcholine to the free cholesterol in plasma, with formation of cholesterol esters and lysophosphatidylcholine. Lysophospholipids have a role in lipid signaling by acting on lysophospholipid receptors (LPL-R). LPL-R's are members of the G protein-coupled receptor family of integral membrane proteins.
PC(14:0/14:0) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(14:0/14:0), in particular, consists of two chains of myristic acid at the C-1 and C-2 positions. The myristic acid moieties are derived from nutmeg and butter. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
PC(14:1(9Z)/16:0) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(14:1(9Z)/16:0), in particular, consists of one chain of myristoleic acid at the C-1 position and one chain of palmitic acid at the C-2 position. The myristoleic acid moiety is derived from milk fats, while the palmitic acid moiety is derived from fish oils, milk fats, vegetable oils and animal fats. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
PC(16:0/18:0) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(16:0/18:0), in particular, consists of one chain of palmitic acid at the C-1 position and one chain of stearic acid at the C-2 position. The palmitic acid moiety is derived from fish oils, milk fats, vegetable oils and animal fats, while the stearic acid moiety is derived from animal fats, coco butter and sesame oil. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
PC(20:0/18:2(9Z,12Z)) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(20:0/18:2(9Z,12Z)), in particular, consists of one chain of arachidic acid at the C-1 position and one chain of linoleic acid at the C-2 position. The arachidic acid moiety is derived from peanut oil, while the linoleic acid moiety is derived from seed oils. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
PC(22:1(13Z)/18:3(9Z,12Z,15Z)) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(22:1(13Z)/18:3(9Z,12Z,15Z)), in particular, consists of one chain of erucic acid at the C-1 position and one chain of a-linolenic acid at the C-2 position. The erucic acid moiety is derived from seed oils and avocados, while the a-linolenic acid moiety is derived from seed oils, especially canola and soybean oil. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
PC(22:6(4Z,7Z,10Z,13Z,16Z,19Z)/22:6(4Z,7Z,10Z,13Z,16Z,19Z)) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(22:6(4Z,7Z,10Z,13Z,16Z,19Z)/22:6(4Z,7Z,10Z,13Z,16Z,19Z)), in particular, consists of two chains of docosahexaenoic acid at the C-1 and C-2 positions. The docosahexaenoic acid moieties are derived from fish oils. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
PE(16:0/18:1(9Z)) is a phosphatidylethanolamine (PE or GPEtn). It is a glycerophospholipid in which a phosphorylethanolamine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphoethanolamines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PE(16:0/18:1(9Z)), in particular, consists of one chain of palmitic acid at the C-1 position and one chain of oleic acid at the C-2 position. The palmitic acid moiety is derived from fish oils, milk fats, vegetable oils and animal fats, while the oleic acid moiety is derived from vegetable oils, especially olive and canola oil. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PEs are neutral zwitterions at physiological pH. They mostly have palmitic or stearic acid on carbon 1 and a long chain unsaturated fatty acid (e.g. 18:2, 20:4 and 22:6) on carbon 2. PE synthesis can occur via two pathways. The first requires that ethanolamine be activated by phosphorylation and then coupled to CDP. The ethanolamine is then transferred from CDP-ethanolamine to phosphatidic acid to yield PE. The second involves the decarboxylation of PS.
PE(20:4(5Z,8Z,11Z,14Z)/16:0) is a phosphatidylethanolamine (PE or GPEtn). It is a glycerophospholipid in which a phosphorylethanolamine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphoethanolamines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PE(20:4(5Z,8Z,11Z,14Z)/16:0), in particular, consists of one chain of arachidonic acid at the C-1 position and one chain of palmitic acid at the C-2 position. The arachidonic acid moiety is derived from animal fats and eggs, while the palmitic acid moiety is derived from fish oils, milk fats, vegetable oils and animal fats. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PEs are neutral zwitterions at physiological pH. They mostly have palmitic or stearic acid on carbon 1 and a long chain unsaturated fatty acid (e.g. 18:2, 20:4 and 22:6) on carbon 2. PE synthesis can occur via two pathways. The first requires that ethanolamine be activated by phosphorylation and then coupled to CDP. The ethanolamine is then transferred from CDP-ethanolamine to phosphatidic acid to yield PE. The second involves the decarboxylation of PS.
PE(18:2(9Z,12Z)/20:4(5Z,8Z,11Z,14Z)) is a phosphatidylethanolamine (PE or GPEtn). It is a glycerophospholipid in which a phosphorylethanolamine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphoethanolamines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PE(18:2(9Z,12Z)/20:4(5Z,8Z,11Z,14Z)), in particular, consists of one chain of linoleic acid at the C-1 position and one chain of arachidonic acid at the C-2 position. The linoleic acid moiety is derived from seed oils, while the arachidonic acid moiety is derived from animal fats and eggs. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PEs are neutral zwitterions at physiological pH. They mostly have palmitic or stearic acid on carbon 1 and a long chain unsaturated fatty acid (e.g. 18:2, 20:4 and 22:6) on carbon 2. PE synthesis can occur via two pathways. The first requires that ethanolamine be activated by phosphorylation and then coupled to CDP. The ethanolamine is then transferred from CDP-ethanolamine to phosphatidic acid to yield PE. The second involves the decarboxylation of PS.
Sphingomyelin (d18:2(4E,14Z)/24:2(5Z,9Z)) or SM(d18:2(4E,14Z)/24:2(5Z,9Z)) is a type of sphingolipid found in animal cell membranes, especially in the membranous myelin sheath which surrounds some nerve cell axons. It usually consists of phosphorylcholine and ceramide. SM(d18:2(4E,14Z)/24:2(5Z,9Z)) consists of a sphinga-4E,14Z-dienine backbone and a 5Z,9Z-tetracosadienoic acid chain. In humans, sphingomyelin is the only membrane phospholipid not derived from glycerol. Like all sphingolipids, SM has a ceramide core (sphingosine bonded to a fatty acid via an amide linkage). In addition, it contains one polar head group, which is either phosphocholine or phosphoethanolamine. The plasma membrane of cells is highly enriched in sphingomyelin and is considered largely to be found in the exoplasmic leaflet of the cell membrane. However, there is some evidence that there may also be a sphingomyelin pool in the inner leaflet of the membrane. Moreover, neutral sphingomyelinase-2, an enzyme that breaks down sphingomyelin into ceramide, has been found to localize exclusively to the inner leaflet further suggesting that there may be sphingomyelin present there. Sphingomyelin can accumulate in a rare hereditary disease called Niemann-Pick Disease, types A and B. Niemann-Pick disease is a genetically-inherited disease caused by a deficiency in the enzyme sphingomyelinase, which causes the accumulation of sphingomyelin in spleen, liver, lungs, bone marrow, and the brain, causing irreversible neurological damage. SMs play a role in signal transduction. Sphingomyelins are synthesized by the transfer of phosphorylcholine from phosphatidylcholine to a ceramide in a reaction catalyzed by sphingomyelin synthase.
PE(20:0/18:2(9Z,12Z)) is a phosphatidylethanolamine (PE or GPEtn). It is a glycerophospholipid in which a phosphorylethanolamine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphoethanolamines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PE(20:0/18:2(9Z,12Z)), in particular, consists of one chain of arachidic acid at the C-1 position and one chain of linoleic acid at the C-2 position. The arachidic acid moiety is derived from peanut oil, while the linoleic acid moiety is derived from seed oils. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PEs are neutral zwitterions at physiological pH. They mostly have palmitic or stearic acid on carbon 1 and a long chain unsaturated fatty acid (e.g. 18:2, 20:4 and 22:6) on carbon 2. PE synthesis can occur via two pathways. The first requires that ethanolamine be activated by phosphorylation and then coupled to CDP. The ethanolamine is then transferred from CDP-ethanolamine to phosphatidic acid to yield PE. The second involves the decarboxylation of PS.
8-8'-Dehydrodiferulic acid is a polyphenol compound found in foods of plant origin  (PMID: 20428313)
Capryloylglycine is an acylglycine consisting of caprylic acid (an 8-carbon medium chain fatty acid) conjugated to glycine. Acylglycines have an aliphatic acyl chain attached to the amino group of glycine through a peptide bond. Capryloylglycine is a solid with moderate solubility in water.  Acylglycines are produced through the action of the enzyme glycine N-acyltransferase (EC 2.3.1.13).  Acylglycines are normally minor metabolites of fatty acids. However, the excretion of certain acylglycines is increased in several inborn errors of metabolism. In certain cases, the measurement of these metabolites in body fluids can be used to diagnose disorders associated with mitochondrial fatty acid beta-oxidation, including medium-chain acyl-coenzyme A (CoA) dehydrogenase (MCAD) deficiency and multiple acyl-CoA dehydrogenation defect (MAD) (PMID: 10708405). Capryloylglycine is frequently used as a cosmetic ingredient where it functions as a conditioning agent or a surfactant. It helps protect the skin‚Äôs surface from water loss and can enhance the effectiveness of cosmetic preservatives. Capryloylglycine-containing creams have been shown to inhibit hair growth in individuals suffering from hypertrichosis (PMID: 33934471), due to it inhibiting ornithine decarboxylase 1, which is present in hair follicles.
Glycerophosphoglycerol (CAS: 6418-92-4) belongs to the class of organic compounds known as dialkyl phosphates. These are organic compounds containing a phosphate group that is linked to exactly two alkyl chains. Glycerophosphoglycerol forms the head group of a class of glycerophospholipids in which a phosphoglycerol moiety occupies a glycerol substitution site. Termed, phosphatidylglycerols (PG), these lipids can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18, and 20 carbons are the most common.
Pantetheine is the mercaptoethyl conjugated amide analogue of pantothenic acid (Vitamin B5). The dimer of this compound, pantethine is more commonly known, and is considered to be a more potent form of vitamin B5 than pantothenic acid. Pantetheine is an intermediate in the production of Coenzyme A by the body. An intermediate in the pathway of coenzyme A formation in mammalian liver and some microorganisms.
Systemic agricultural fungicid
Gynocardin is found in fruits. Glucoside from Pangium edule (football fruit
10,11-dihydro-20-trihydroxy-leukotriene B4 is the metabolite of lipid omega-oxidation of leukotriene B4 (LTB4). LTB4 is the major metabolite in neutrophil polymorphonuclear leukocytes. Omega-oxidation is the major pathway for the catabolism of leukotriene B4 in human polymorphonuclear leukocytes. Leukotrienes are metabolites of arachidonic acid derived from the action of 5-LO (5-lipoxygenase). The immediate product of 5-LO is LTA4 (leukotriene A4), which is enzymatically converted into either LTB4 (leukotriene B4) by LTA4 hydrolase or LTC4 (leukotriene C4) by LTC4 synthase. The regulation of leukotriene production occurs at various levels, including expression of 5-LO, translocation of 5-LO to the perinuclear region, and phosphorylation to either enhance or inhibit the activity of 5-LO. Biologically active LTB4 is metabolized by omega-oxidation carried out by specific cytochrome P450s (CYP4F) followed by beta-oxidation from the omega-carboxy position and after CoA ester formation (PMID: 7649996, 17623009, 2853166, 6088485). Leukotrienes are eicosanoids. The eicosanoids consist of the prostaglandins (PGs), thromboxanes (TXs), leukotrienes (LTs), and lipoxins (LXs). The PGs and TXs are collectively identified as prostanoids. Prostaglandins were originally shown to be synthesized in the prostate gland, thromboxanes from platelets (thrombocytes), and leukotrienes from leukocytes, hence the derivation of their names. All mammalian cells except erythrocytes synthesize eicosanoids. These molecules are extremely potent, able to cause profound physiological effects at very dilute concentrations. All eicosanoids function locally at the site of synthesis, through receptor-mediated G-protein linked signalling pathways.
Scoparone is found in anise. Scoparone is found in several citrus oil
Aspartame is the name for an artificial, non-carbohydrate sweetener, aspartyl-phenylalanine-1-methyl ester; i.e., the methyl ester of the dipeptide of the amino acids aspartic acid and phenylalanine. It is marketed under a number of trademark names, such as Equal, and Canderel, and is an ingredient of approximately 6,000 consumer foods and beverages sold worldwide. It is commonly used in diet soft drinks, and is often provided as a table condiment. It is also used in some brands of chewable vitamin supplements. In the European Union, it is also known under the E number (additive code) E951. Aspartame is also one of the sugar substitutes used by diabetics. Upon ingestion, aspartame breaks down into several constituent chemicals, including the naturally-occurring essential amino acid phenylalanine which is a health hazard to the few people born with phenylketonuria, a congenital inability to process phenylalanine. Aspartic acid is an amino acid commonly found in foods. Approximately 40% of aspartame (by mass) is broken down into aspartic acid. Because aspartame is metabolized and absorbed very quickly (unlike aspartic acid-containing proteins in foods), it is known that aspartame could spike blood plasma levels of aspartate. Aspartic acid is in a class of chemicals known as excitotoxins. Abnormally high levels of excitotoxins have been shown in hundreds of animals studies to cause damage to areas of the brain unprotected by the blood-brain barrier and a variety of chronic diseases arising out of this neurotoxicity.
2,2',3,4,4',5',6-Heptabromodiphenyl ether is classified as a Food Contaminant (code WG) in the DFC.
Nicotinamide riboside is involved in nicotinate and nicotinamide metabolism. Nicotinamide riboside was originally identified as a nutrient in milk. It is a useful compound for the elevation of NAD+ levels in humans. Nicotinamide riboside has recently been discovered to be an NAD(+) precursor that is converted into nicotinamide mononucleotide by specific nicotinamide riboside kinases, Nrk1 and Nrk2. It has been shown that exogenous nicotinamide riboside promotes Sir2-dependent repression of recombination, improves gene silencing, and extends the lifespan of certain animal models without calorie restriction (PMID: 17482543). Supplementation in mammalian cells and mouse tissues increases NAD(+) levels and activates SIRT1 and SIRT3, culminating in enhanced oxidative metabolism and protection against high-fat diet-induced metabolic abnormalities (PMID: 22682224). Recent data suggest that nicotinamide riboside may be the only vitamin precursor that supports neuronal NAD+ synthesis (PMID: 18429699). Nicotinamide riboside kinase has an essential role in the phosphorylation of nicotinamide riboside and the cancer drug tiazofurin (PMID: 15137942).
1-Methoxy-1H-indole-3-acetonitrile is found in brassicas. 1-Methoxy-1H-indole-3-acetonitrile is a stress metabolite from the Japanese radish Daikon (Raphanus sativus var. hortensis) inoculated with Pseudomonas cichorii and from clubroots of Chinese cabbage (Brassica pekinensis) infected with Plasmodiophora brassicae.
Rosoxacin is a quinolone derivative antibiotic for the treatment of bacterial infection of respiratory tract, urinary tract, GI, CNS and immuno compromised patients. Rosoxacin is known to be effective against penicillin resistant strains and is a single dose orally administered drug, which avoids all complications of parenteral administration seen with penicillin, especially anaphylactic shock.
Nitrofurazone is only found in individuals that have used or taken this drug. It is a topical anti-infective agent effective against gram-negative and gram-positive bacteria. It is used for superficial wounds, burns, ulcers, and skin infections. Nitrofurazone has also been administered orally in the treatment of trypanosomiasis. [PubChem]The exact mechanism of action is unknown. Nitrofurazone inhibits several bacterial enzymes, especially those involved in the aerobic and anaerobic degradation of glucose and pyruvate. This activity is believed also to affect pyruvate dehydrogenase, citrate synthetase, malate dehydrogenase, glutathione reductase, and pyruvate decarboxylase.
Leukotriene B4 dimethylamide is a derivative of Leukotriene B4 (LTB4) and was shown to inhibit neutrophil degranulation induced by LTB4. LTB4 is the major metabolite in neutrophil polymorphonuclear leukocytes. Leukotrienes are metabolites of arachidonic acid derived from the action of 5-LO (5-lipoxygenase). The immediate product of 5-LO is LTA4 (leukotriene A4), which is enzymatically converted into either LTB4 (leukotriene B4) by LTA4 hydrolase or LTC4 (leukotriene C4) by LTC4 synthase. The regulation of leukotriene production occurs at various levels, including expression of 5-LO, translocation of 5-LO to the perinuclear region and phosphorylation to either enhance or inhibit the activity of 5-LO. Biologically active LTB4 is metabolized by w-oxidation carried out by specific cytochrome P450s (CYP4F) followed by beta-oxidation from the w-carboxy position and after CoA ester formation. (PMID: 6288032, 17623009)Leukotrienes are eicosanoids. The eicosanoids consist of the prostaglandins (PGs), thromboxanes (TXs), leukotrienes (LTs), and lipoxins (LXs). The PGs and TXs are collectively identified as prostanoids. Prostaglandins were originally shown to be synthesized in the prostate gland, thromboxanes from platelets (thrombocytes), and leukotrienes from leukocytes, hence the derivation of their names. All mammalian cells except erythrocytes synthesize eicosanoids. These molecules are extremely potent, able to cause profound physiological effects at very dilute concentrations. All eicosanoids function locally at the site of synthesis, through receptor-mediated G-protein linked signalling pathways.
Dabigatran etexilate is an oral prodrug that is metabolized by a serum esterase to dabigatran. It is a synthetic, competitive and reversible direct thrombin inhibitor. Inhibition of thrombin disrupts the coagulation cascade and inhibits the formation of clots. Dabigatran etexilate may be used to decrease the risk of venous thromboembolic events in patients who have undergone total hip or knee replacement surgery, or to prevent stroke and systemic embolism in patients with atrial fibrillation, in whom anticoagulation therapy is indicated.
Doripenem (common name doripenem monohydrate) is an ultra-broad spectrum injectable antibiotic. It is a beta-lactam and belongs to the subgroup of carbapenems. It was launched by Shionogi Co. of Japan under the brand name Finibax in 2005 and is being marketed outside Japan by Johnson &amp; Johnson. It is particularly active against Pseudomonas aeruginosa. Doripenem is a beta-lactam antibiotic agent belonging to the carbapenem group, with a broad spectrum of bacterial sensitivity. Although doripenem may be quite similar to other related carbapenem agents, the antibiotic includes several divergent properties. For example, doripenem includes a transfiguration of hydroxyethyl group, and in position 4 there is a carbon atom. These differences make the agent more stable against other pathogens. Doripenem inhibits renal dehydropeptidase-1 hydrolysis due to its structure containing a single side chain, 1-beta methyl. Additionally, within the molecular structure a sulfamoylaminomethyl-pyrrolindinylthio group is attached to a side chain giving the molecule increased antibacterial action against gram-negative microbes. In vivo, doripenem inhibits the synthesis of cell walls by attaching itself to penicillin binding proteins, also known as PBPs.
Punicalagin is the major tannin component of Terminalia catappa and have been characterized to possess antioxidative and anti-genotoxic activities. T. catappa has been a popular folk medicine for preventing hepatoma and treating hepatitis in Taiwan; the leaves contain many hydrolyzable tannins. Although the leaves of T. catappa have been claimed to be effective in preventing hepatoma, the mechanism of its chemopreventive effect remains to be elucidated, and their effects on reactive oxygen species (ROS) mediated carcinogenesis are still unclear. (PMID: 16242868).
(-)-Epigallocatechin 3-(3-methyl-gallate) is found in tea. (-)-Epigallocatechin 3-(3-methyl-gallate) is isolated from green tea (Thea sinensis) and oolong tea (Camellia sinensis).
(-)-Epigallocatechin 3-(3-methyl-gallate) is found in tea. (-)-Epigallocatechin 3-(3-methyl-gallate) is isolated from green tea (Thea sinensis) and oolong tea (Camellia sinensis).
Dehydroisochalciporone is found in mushrooms. Nonpungent constituent of Chalciporus piperatus.
Morpholine is a permitted (FDA) in edible coatings for fruit and vegetables. Morpholine is a food contaminant arising from its use as a boiler water additive Morpholine is a common additive, in ppm concentrations, for pH adjustment in both fossil fuel and nuclear power plant steam systems. Morpholine is used because its volatility is about the same as water, so once it is added to the water, its concentration becomes distributed rather evenly in both the water and steam phases. Its pH adjusting qualities then become distributed throughout the steam plant to provide corrosion protection. Morpholine is often used in conjunction with low concentrations of hydrazine or ammonia to provide a comprehensive all-volatile treatment chemistry for corrosion protection for the steam systems of such plants. Morpholine decomposes reasonably slowly in the absence of oxygen even at the high temperatures and pressures in these steam systems. Morpholine is an organic chemical compound having the chemical formula O(CH2CH2)2NH. This heterocycle, pictured at right, features both amine and ether functional groups. Because of the amine, morpholine is a base; its conjugate acid is called morpholinium. For example, when morpholine is neutralized by hydrochloric acid, one obtains the salt morpholinium chloride. Morpholine is widely used in organic synthesis. For example, it is a building block in the preparation of the antibiotic linezolid and the anticancer agent gefitinib (Iressa)
Treosulfan belongs to the family of Methanesulfonates. These are compounds containing a methanesulfonate moiety, which consists of a methane linked to the sulfur atom of a sulfonate group.
2,4-Pentanedione is found in papaya. 2,4-Pentanedione is isolated from ethereal oil of Pinus sylvestris (Scotch pine
Silicristin is found in coffee and coffee products. Silicristin is isolated from fruits of Silybum marianum (milk thistle).
Procyanidin C1 is found in apple. Proanthocyanidin C1 is a B type proanthocyanidin. It is an epicatechin trimer found in grape (Vitis vinifera). (Wikipedia).
Cinnamtannin A2 is found in chinese cinnamon. Cinnamtannin A2 is isolated from Cinnamomum cassia (Chinese cinnamon).
Diosbulbin A is found in root vegetables. Diosbulbin A is a constituent of Dioscorea bulbifera (air potato)
Diosbulbin B is found in root vegetables. Diosbulbin B is a constituent of Dioscorea bulbifera (air potato).
Diosbulbin C is found in root vegetables. Diosbulbin C is a constituent of Dioscorea bulbifera (air potato).
Guggulsterone is an ingredient in many nutritional supplements. Guggulsterone is a plant sterol derived from the gum resin (guggulu) of the tree Commiphora mukul. This sterol can inhibit NF-&#954;B activation and downregulate the expression of inflammatory gene products such as COX-2 and MMP-9, which are major players in the development of arthritis. Guggulsterone also can suppress osteoclastogenesis induced by RANKL (receptor activator of NF-&#954;B ligand), a bone-resorbing cytokine. The anti-inflammatory activity of C. mukul (guggul) has been compared with that of NSAIDs, namely phenylbutazone and ibuprofen. Guggulsterone is used to treat obesity, diabetes, hyperlipidemia, atherosclerosis, and osteoarthritis, and has been recently shown to antagonize the farnesoid X receptor and decrease the expression of bile acid-activated genes. It modulates activation of NF-kappaB, which has been closely linked with inflammatory diseases affected by guggulsterone. (PMID: 17475558, 15322087).
Tacrine is only found in individuals that have used or taken this drug. It is a centerally active cholinesterase inhibitor that has been used to counter the effects of muscle relaxants, as a respiratory stimulant, and in the treatment of Alzheimer's disease and other central nervous system disorders. [PubChem]The mechanism of tacrine is not fully known, but it is suggested that the drug is an anticholinesterase agent which reversibly binds with and inactivates cholinesterases. This inhibits the hydrolysis of acetylcholine released from functioning cholinergic neurons, thus leading to an accumulation of acetylcholine at cholinergic synapses. The result is a prolonged effect of acetylcholine.
Demethoxyfumitremorgin C is produced by Aspergillus fumigatu
Quercetin 3-galactoside is found in alcoholic beverages. Quercetin 3-galactoside occurs widely in plants, e.g. in apple peel and Hypericum perforatum (St John's wort).Hyperoside is the 3-O-galactoside of quercetin. It is a medicinally active compound that can be isolated from Drosera rotundifolia, from the Stachys plant, from Prunella vulgaris, from Rumex acetosella and from St John's wort. (Wikipedia
Natamycin is only found in individuals that have used or taken this drug. It is an amphoteric macrolide antifungal antibiotic from Streptomyces natalensis or S. chattanoogensis. It is used for a variety of fungal infections, mainly topically. [PubChem]Like other polyene antibiotics, Natamycin inhibits fungal growth by binding to sterols. Specifically, Natamycin binds to ergosterol in the plasma membrane, preventing ergosterol-dependent fusion of vacuoles, as well as membrane fusion and fission. This differs from the mechanism of most other polyene antibiotics, which tend to work by altering fungal membrane permeability instead.
(+)-(1R,2R)-1,2-Diphenylethane-1,2-diol is converted from cis-stilbene oxide via the enzyme microsomal epoxide hydrolase (EC 3.3.2.9). This is a key hepatic enzyme that is involved in the metabolism of numerous xenobiotics, such as 1,3-butadiene oxide, styrene oxide and the polycyclic aromatic hydrocarbon benzo[a]pyrene 4,5-oxide.
Mitiglinide is only found in individuals that have used or taken this drug. It is a drug for the treatment of type 2 diabetes.Mitiglinide is thought to stimulate insulin secretion by binding to and blocking ATP-sensitive K(+) (K(ATP)) channels (Kir6.2/SUR1 complex, KATP channels) in pancreatic beta-cells. Closure of potassium channels causes depolarization which stimulates calcium influx through voltage-gated calcium channels. High intracellular calcium subsequently triggers the exocytosis of insulin granules.
Trilostane is only found in individuals that have used or taken this drug. It is an inhibitor of 3 beta-hydroxysteroid dehydrogenase used in the treatment of Cushing's syndrome. It was withdrawn from the United States market in April 1994. [Wikipedia]Trilostane produces suppression of the adrenal cortex by inhibiting enzymatic conversion of steroids by 3-beta-hydroxysteroid dehydrogenase/delta 5,4 ketosteroid isomerase, thus blocking synthesis of adrenal steroids.
Melibiose (CAS: 585-99-9) is a disaccharide consisting of one galactose and one glucose moiety in an alpha (1-6) glycosidic linkage. This sugar is produced and metabolized only by enteric and lactic acid bacteria and other microbes, such as Dickeya dadantii, Escherichia, Leuconostoc, and Saccharomyces (PMID: 19734309, 28453942). It is not an endogenous metabolite but may be obtained from the consumption of partially fermented molasses, brown sugar, or honey. Antibodies to melibiose will appear in individuals affected by Chagas' disease (Trypanosoma cruzi infection). Melibiose is not metabolized by humans but can be broken down by gut microflora, such as E. coli. In fact, E. coli is able to utilize melibiose as a sole source of carbon. Melibiose is first imported by the melibiose permease, MelB and then converted into β-D-glucose and β-D-galactose by the α-galactosidase encoded by melA. Because of its poor digestibility, melibiose (along with rhamnose) can be used together for noninvasive intestinal mucosa barrier testing. This test can be used to assess malabsorption or impairment of intestinal permeability. Recent studies with dietary melibiose have shown that it can strongly affect the Th cell responses to an ingested antigen. It has been suggested that melibiose could be used to enhance the induction of oral tolerance (PMID: 17986780).
Amlodipine is a long-acting calcium channel blocker used as an anti-hypertensive and in the treatment of angina. As other calcium channel blockers, amlodipine acts by relaxing the smooth muscle in the arterial wall, decreasing peripheral resistance and hence improving blood pressure; in angina it improves blood flow to the myocardium. It was developed under the direction of Dr. Simon Campbell; A long acting dihydropyridine calcium channel blocker. It is effective in the treatment of angina pectoris and hypertension; in angina it improves blood flow to the myocardium. Amlodipine (as besylate, mesylate or maleate) is a long-acting calcium channel blocker used as an anti hypertensive and in the treatment of angina. Amlodipine is marketed as Norvasc in North America and as Istin in the United Kingdom as well as under various other names. As other calcium channel blockers, amlodipine acts by relaxing the smooth muscle in the arterial wall, decreasing peripheral resistance and hence improving blood pressure; Amlodipine (as besylate, mesylate or maleate) is a long-acting calcium channel blocker used as an anti-hypertensive and in the treatment of angina. Amlodipine is marketed as Norvasc in North America and as Istin in the United Kingdom as well as under various other names. As other calcium channel blockers, amlodipine acts by relaxing the smooth muscle in the arterial wall, decreasing peripheral resistance and hence improving blood pressure; in angina it improves blood flow to the myocardium. It was developed under the direction of Dr. Simon Campbell.
Araliasaponin I is found in green vegetables. Araliasaponin I is a constituent of Aralia elata (Japanese angelica tree).
Avenoleic acid is found in cereals and cereal products. Avenoleic acid is a constituent of oat seeds (Avena sativa)
13-oxoODE is produced from 13-HODE by a NAD+-dependent dehydrogenase present in rat colonic mucosa. 13-OxoODE has been shown to stimulate cell proliferation when instilled intrarectally in rats. 13-OxoODE has also been detected in preparations of rabbit reticulocyte plasma and mitochondrial membranes, mostly esterified to phospholipids. Production of 13-oxoODE is putatively linked to the maturation of reticulocytes to erythrocytes through the activity of 15-LO.
N-[(4E,8E)-1,3-dihydroxyoctadeca-4,8-dien-2-yl]hexadecanamide is found in pulses. N-[(4E,8E)-1,3-dihydroxyoctadeca-4,8-dien-2-yl]hexadecanamide is isolated from Vigna angularis (azuki bean
Pyronaridine belongs to the family of Naphthyridines. These are compounds containing a naphthyridine moeity, a naphthalene in which a carbon atom has been replaced by a nitrogen in each of the two rings. The naphthyridine skeleton can also be described as an assembly two fused pyridine rings, which do not share their nitrogen atom.
Coniferyl alcohol (CAS: 458-35-5), also known as coniferol, belongs to the class of organic compounds known as methoxyphenols. Methoxyphenols are compounds containing a methoxy group attached to the benzene ring of a phenol moiety. Coniferyl alcohol is an organic compound. When copolymerized with related aromatic compounds, coniferyl alcohol forms lignin or lignans. Coniferyl alcohol is an intermediate in the biosynthesis of eugenol, stilbenoids, and coumarin. Outside of the human body, coniferyl alcohol has been detected, but not quantified in, several different foods, such as common sages, chestnuts, cereals and cereal products, gingers, and cashew nuts. This could make coniferyl alcohol a potential biomarker for the consumption of these foods. Gum benzoin contains a significant amount of coniferyl alcohol and its esters. Coniferyl alcohol is an organic compound. This colourless crystalline solid is a phytochemical, one of the monolignols. It is synthesized via the phenylpropanoid biochemical pathway.
Glabrene is found in herbs and spices. Glabrene is a constituent of root of Glycyrrhiza glabra (licorice)
Bortezomib (originally PS-341 and marketed as Velcade by Millennium Pharmaceuticals) is the first therapeutic proteasome inhibitor to be tested in humans. It is approved in the U.S. for treating relapsed multiple myeloma and mantle cell lymphoma. In multiple myeloma, complete clinical responses have been obtained in patients with otherwise refractory or rapidly advancing disease.
Holmium, also known as 67ho or holmio, is a member of the class of compounds known as homogeneous lanthanide compounds. Homogeneous lanthanide compounds are inorganic compounds containing only metal atoms, with the largest atom being a lanthanide atom. Holmium is found in the minerals monazite and gadolinite and is usually commercially extracted from monazite using ion-exchange techniques. Its compounds in nature and in nearly all of its laboratory chemistry are trivalently oxidized, containing Ho(III) ions. Trivalent holmium ions have fluorescent properties similar to many other rare-earth ions (while yielding their own set of unique emission light lines), and thus are used in the same way as some other rare earths in certain laser and glass-colorant applications .
Methylpyrazine is found in alcoholic beverages. Methylpyrazine is a flavouring agent. Methylpyrazine is present in many foods, e.g. bakery products, dairy products, meats, baked or French fried potato, roasted barley, cocoa, coffee, tea, roasted filbert, roasted pecan, peanut, soy products, rum and whisky.
2-C-methyl-D-erythritol is a soluble carbohydrate that is found in certain higher plants. In particular, it can be found in the petals, leaves and stems of certain flowering plants (PMID: 15384409). 2-Methylerythritol or 2-C-methyl-D-erythritol is likely a dephosphorylated form of 2-C-methyl-D-erythritol-4-phosphate. 2-C-methyl-D-erythritol-4-phosphate (MEP) is a central component to the non-mevalonate pathway for isoprenoid synthesis.  This pathway is unique to certain gram negative and a few gram positive bacteria as well as plants and apicomplexan protozoa such as malaria parasites. Isoprenoid compounds are a diverse group of natural products that are essential components in all cells. Isoprenoids are biosynthesized from the simple precursors isopentenyl diphosphate (IPP) and dimethylallyl diphosphate (DMAPP). IPP and DMAPP serve as the basis for the biosynthesis of molecules used in processes as diverse as protein prenylation, cell membrane maintenance, hormones, protein anchoring and N-glycosylation. 2-Methylerythritol is occasionally found in human urine specimens and is believed to be from exogenous dietary sources (plant products, leafy salads) or possibly produced by certain species of gut microflora.
4-Methylbenzaldehyde, also known as p-toluylaldehyde or p-formyltoluene, belongs to the class of organic compounds known as benzoyl derivatives.  A tolualdehyde compound with the methyl substituent at the 4-position. These are organic compounds containing an acyl moiety of benzoic acid with the formula (C6H5CO-). 4-Methylbenzaldehyde is a cherry and fruity tasting compound. 4-Methylbenzaldehyde has been detected, but not quantified, in several different foods, such as caraway, sweet cherries, tea, nuts, and coffee and coffee products.
Ginsenoside Ro is found in tea. Ginsenoside Ro is a constituent of Panax ginseng (ginseng)
3,4-Dihydroxybutyric acid (also known as 3,4-Dihydroxybutanoic acid or 3,4-DB, or 2-deoxytetronic acid, or 2-DTA) is a normal human urinary metabolite that is excreted in increased concentration in patients with succinic semialdehyde dehydrogenase (SSADH) deficiency (PMID 12127325), which is a genetic disorder. SSADH deficiency is caused by an enzyme deficiency in GABA degradation. The most constant features with this disease are developmental delay, hypotonia and intellectual disability. Nearly half of SSADH patients exhibit ataxia, behavioral problems, seizures, and hyporeflexia. Normal adults excrete 0.37 +/- 0.15 (SD) mmoles of 3,4-dihydroxybutyrate per 24 hr. 3,4-dihydroxybutyrate is also detectable in blood. The renal clearance of 3,4-dihydroxybutyrate is roughly equal that of creatinine. 3,4-dihydroxybutyric acid has also been found in foods and is believed to be formed via the degradation (cooking) of di- and poly-saccharides (PMID: 1167165).  3,4-Dihydroxybutyric acid is believed to play a role in satiety or the feeling of fullness and suppresses food intake (PMID: 3191387; PMID: 6720928). 3,4-dihydroxybutyric acid is also elevated in the serum of individuals with dementia and may even serve as a predictive biomarker for dementia (PMID: 25177334). 3,4-Dihydroxybutyric acid is also a metabolite produced in Escherichia (PMID: 28342964).
3,4-Dihydroxyphenylacetone is found in animal foods. 3,4-Dihydroxyphenylacetone is a component of wood smokes, present in smoked meats. Metabolite of 2-Amino-3-(3,4-dihydroxyphenyl)-2-methylpropanoic acid <ht>BDS26-B</ht> and N,a-Dimethyl-3,4-(methylenedioxy)phenethylamine <ht>NCZ31-D</ht
Desmethylnortriptyline is a metabolite of Amitriptyline. Amitriptyline, nortriptyline and their metabolites, desmethylnortriptyline, cis and trans 10-hydroxyamitriptyline, cis and trans 10-hydroxynortriptyline and amitriptyline-N-oxide, have been tested for inhibitory effect on the uptake of serotonin. All the metabolites are less anticholinergic than amitriptyline and nortriptyline. (PMID: 7395525)
Tetrahydroisoquinoline is a secondary amine with the chemical formula C9H11N.Like other secondary amines, tetrahydroisoquinoline can be oxidized to the corresponding nitrone using hydrogen peroxide, catalyzed by selenium dioxide.The tetrahydroisoquinoline skeleton is commonly encountered in pharmaceutical drugs, notably quaternary ammonium muscle relaxants. Tetrahydroisoquinoline derivatives may be formed in the body as metabolites of some drugs, and this was once thought to be involved in the development of alcoholism.This theory has now been discredited and is no longer generally accepted by the scientific community, but endogenous production of neurotoxic tetrahydroisoquinoline derivatives such as norsalsolinol continue to be investigated as possible causes for some conditions such as Parkinson's disease.{from wiki).
Tetrahydroisoquinoline is a secondary amine with the chemical formula C9H11N.Like other secondary amines, tetrahydroisoquinoline can be oxidized to the corresponding nitrone using hydrogen peroxide, catalyzed by selenium dioxide.The tetrahydroisoquinoline skeleton is commonly encountered in pharmaceutical drugs, notably quaternary ammonium muscle relaxants. Tetrahydroisoquinoline derivatives may be formed in the body as metabolites of some drugs, and this was once thought to be involved in the development of alcoholism.This theory has now been discredited and is no longer generally accepted by the scientific community, but endogenous production of neurotoxic tetrahydroisoquinoline derivatives such as norsalsolinol continue to be investigated as possible causes for some conditions such as Parkinson's disease.{from wiki).
Cadaverine is a foul-smelling diamine formed by bacterial decarboxylation of lysine that occurs during protein hydrolysis during putrefaction of animal tissue. However, this diamine is not purely associated with putrefaction. Cadaverine is a toxic diamine with the formula NH2(CH2)5NH2, which is similar to putrescine's NH2(CH2)4NH2. Cadaverine is also known by the names 1,5-pentanediamine and pentamethylenediamine. It is also produced in small quantities by mammals. In particular, it is partially responsible for the distinctive smell of urine and semen. Elevated levels of cadaverine have been found in the urine of some patients with defects in lysine metabolism. Cadaverine is toxic in large doses. In rats it had a low acute oral toxicity of more than 2000 mg/kg body weight. Cadaverine can be found in Corynebacterium (PMID:27872963).
psi-Pelletierine is found in fruits. psi-Pelletierine is found in bark of pomegranate (Punica granatum
Isopropyl acetate is found in alcoholic beverages. Isopropyl acetate is isolated from ripening melons, apples, bananas, blackcurrants, other fruits and grape oil. Also present in cheddar cheese, soybean, beer, red wine, white wine and plum brandy. Isopropyl acetate is a flavouring ingredient Isopropyl acetate is a solvent with a wide variety of manufacturing uses that is miscible with most other organic solvents, and moderately soluble in water. It is used as a solvent for cellulose, plastics, oil and fats. It is a component of some printing inks and perfumes. Isopropyl acetate is an ester, an organic compound which is the product of condensation of acetic acid and isopropanol. It is a clear, colorless liquid with a characteristic fruity odor
Sedoheptulose (CAS: 3019-74-7) is a ketoheptose, a monosaccharide with seven carbon atoms and a ketone functional group. It is one of the few heptoses found in nature. Sedoheptulose is a seven-carbon ketose sugar originally found in Sedum spectabile, a common perennial garden plant. Later it was shown to be widely distributed in the plants of the Crassulaceae family. The Crassulaceae, or orpine family, is a family of dicotyledons. They store water in their succulent leaves. They are found worldwide, but mostly occur in the northern hemisphere and southern Africa, typically in dry and/or cold areas where water may be scarce. The family includes about 1,400 species in 33 genera. As a result, this sugar is often found to be part of the human diet. This sugar, D-sedoheptulose, is a significant intermediary compound in the cyclic regeneration of D-ribulose. It also plays an important role as a transitory compound in the cyclic regeneration of D-ribulose for carbon dioxide fixation in plant photosynthesis.
3-Hexanone, also known as 3-oxohexane or hexan-3-one, belongs to the class of organic compounds known as ketones. These are organic compounds in which a carbonyl group is bonded to two carbon atoms R2C=O (neither R may be a hydrogen atom). Ketones that have one or more alpha-hydrogen atoms undergo keto-enol tautomerization, the tautomer being an enol. 3-Hexanone is a very hydrophobic molecule, practically insoluble in water and relatively neutral. 3-Hexanone is an ether and grape tasting compound. Outside of the human body, 3-Hexanone has been detected, but not quantified in, several different foods, such as pepper (capsicum), oregon yampahs, cinnamons, cloudberries, and cardamoms. 3-Hexanone, with regard to humans, has been found to be associated with several diseases such as nonalcoholic fatty liver disease, pervasive developmental disorder not otherwise specified, autism, and perillyl alcohol administration for cancer treatment. 3-hexanone has also been linked to the inborn metabolic disorder celiac disease.
PC(14:0/22:4(7Z,10Z,13Z,16Z)) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(14:0/22:4(7Z,10Z,13Z,16Z)), in particular, consists of one chain of myristic acid at the C-1 position and one chain of adrenic acid at the C-2 position. The myristic acid moiety is derived from nutmeg and butter, while the adrenic acid moiety is derived from animal fats. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
N-Phenylacetylphenylalanine (PAP) is a peptide analogue used as a potential antisickling agent. This biaromatic agent has properties that make it a suitable candidate for the development of a useful therapeutic agent for the treatment of sickle cell disease. (PMID: 3663644, 6587344).
N acetyl LTE4 is a minor metabolite of Leukotriene E4 in normal human subjects. (PMID: 2174886).
10-alpha-methoxy-9,10-dihydrolysergol is a metabolite of nicergoline. Nicergoline (marketed under the trade name Sermion) is an ergot derivative used to treat senile dementia and other disorders with vascular origins. It has been found to increase mental agility and enhance clarity and perception. It decreases vascular resistance and increases arterial blood flow in the brain, improving the utilization of oxygen and glucose by brain cells. It has similar vasoactive properties in other areas of the body, particularly the lungs. (Wikipedia)
Melatonin is a biogenic amine that is found in animals, plants and microbes. Aaron B. Lerner of Yale University is credited for naming the hormone and for defining its chemical structure in 1958. In mammals, melatonin is produced by the pineal gland. The pineal gland is small endocrine gland, about the size of a rice grain and shaped like a pine cone (hence the name), that is located in the center of the brain (rostro-dorsal to the superior colliculus) but outside the blood-brain barrier. The secretion of melatonin increases in darkness and decreases during exposure to light, thereby regulating the circadian rhythms of several biological functions, including the sleep-wake cycle. In particular, melatonin regulates the sleep-wake cycle by chemically causing drowsiness and. lowering the body temperature. Melatonin is also implicated in the regulation of mood,learning and memory, immune activity, dreaming, fertility and reproduction. Melatonin is also an effective antioxidant. Most of the actions of melatonin are mediated through the binding and activation of melatonin receptors. Individuals with autism spectrum disorders(ASD) may have lower than normal levels of melatonin. A 2008 study found that unaffected parents of individuals with ASD also have lower melatonin levels, and that the deficits. were associated with low activity of the ASMT gene, which encodes the last enzyme of melatonin synthesis. Reduced melatonin production has also been proposed as a likely factor in the significantly higher cancer rates in night workers.
2,6-Dimethylaniline is a metabolite of lidocaine. Lidocaine, Xylocaine, or lignocaine is a common local anesthetic and antiarrhythmic drug. Lidocaine is used topically to relieve itching, burning and pain from skin inflammations, injected as a dental anesthetic or as a local anesthetic for minor surgery. (Wikipedia)
Aldehydo-L-iduronate is also known as aldehydo-L-Iduronic acid.  Aldehydo-L-iduronate is considered to be soluble (in water) and acidic
Carbinoxamine is a first generation antihistamine that competes with free histamine for binding at HA-receptor sites. This antagonizes the effects of histamine on HA-receptors, leading to a reduction of the negative symptoms brought on by histamine HA-receptor binding. The product label for carbinoxamine as an over the counter cough and cold medicine is being modified to state 'do not use' in children under 4 years of age in order to prevent and reduce misuse, as many unapproved carbinoxamine-containing preparations contained inappropriate labeling, which promoted unapproved uses (including management of congestion, cough, the common cold, and the use in children under 2 years of age), which can potentially cause serious health risks.
Nebivolol is only found in individuals that have used or taken this drug. It is a highly cardioselective vasodilatory beta1 receptor blocker used in treatment of hypertension. In most countries, this medication is available only by prescription. [Wikipedia]Nebivolol is a selective &beta;1-receptor antagonist. Activation of &beta;1-receptors by epinephrine increases the heart rate and the blood pressure, and the heart consumes more oxygen. Nebivolol blocks these receptors which reverses the effects of epinephrine, lowering the heart rate and blood pressure. In addition, beta blockers prevent the release of renin, which is a hormone produced by the kidneys which leads to constriction of blood vessels. At high enough concentrations, this drug may also bind beta 2 receptors.
(1xi,3xi)-1,2,3,4-Tetrahydro-1-methyl-beta-carboline-3-carboxylic acid is found in alcoholic beverages. (1xi,3xi)-1,2,3,4-Tetrahydro-1-methyl-beta-carboline-3-carboxylic acid is widespread in many foodstuffs especially fruit juices, jams and fermented foods or beverages including beer and soy sauce. Also present in the toxic fly agaric mushroom (Amanita muscaria). (1xi,3xi)-1,2,3,4-Tetrahydro-1-methyl-beta-carboline-3-carboxylic acid is formed by Pictet-Spengler condensation between acetaldehyde and L-tryptophan in nature or during food processing.
1-Butanethiol, also known as 1-butyl mercaptan or 1-butylthiol, belongs to the class of organic compounds known as alkylthiols. These are organic compounds containing the thiol functional group linked to an alkyl chain. 1-Butanethiol is a coffee, egg, and garlic tasting compound. 1-Butanethiol has been detected, but not quantified, in milk and milk products and potato. Commercially, this is performed using ultraviolet light. It is sometimes placed in the "stink bombs" and "stink perfumes" for pranksters. Butanethiol is a very noxious and caustic chemical compound, and at sufficiently high concentrations, it produces serious health effects in both humans and animals, especially as a result of prolonged exposure. It may cause effects on the thyroid and the nervous system and could cause lowering of consciousness. The scent of butanethiol is so strong that the human nose can easily detect it in the air at concentrations as low as 10 parts per billion. The substance irritates the eyes, the skin, and the respiratory tract. Butanethiol is a thiol of low molecular weight, and it is highly flammable. Butanethiol is used as an industrial solvent, and as an intermediate for cotton defoliants. The threshold level for 1-butanethiol is reported as 1.4 ppb. Butanethiol is chemically classified among the thiols, which are organic compounds with molecular formulas and structural formulas similar to alcohols, except that sulfur-containing sulfhydryl group (-SH) replaces the oxygen-containing hydroxyl group (-OH) in the molecule. Butanethiol is prepared by the free radical catalyzed addition of hydrogen sulfide to 1-butene. Contact with the skin and mucous membranes causes burns, and contact with the eyes can lead to blurred vision or complete blindness. Inhalation may cause weakness, confusion, cough, dizziness, drowsiness, headache, nausea, vomiting, and shortness of breath.
Benzo[a]pyrene-7,8-dihydrodiol-9,10-oxide, also known as BPDE or benzo(a)Pyrene diol epoxide, is classified as a member of the Pyrenes. Pyrenes are compounds containing a pyrene moiety, which consists four fused benzene rings, resulting in a flat aromatic system. Benzo[a]pyrene-7,8-dihydrodiol-9,10-oxide is considered to be practically insoluble (in water) and relatively neutral. It is a carcinogenic metabolite of benzo[a]pyrene (BaP) which forms adducts with DNA and proteins and is hydrolysed to BPDE tetrols. It is used as a marker for BaP exposure (a surrogate marker for PAHs).
2-Hydroxycarbamazepine is a metabolite of carbamazepine. Carbamazepine (CBZ) is an anticonvulsant and mood-stabilizing drug used primarily in the treatment of epilepsy and bipolar disorder, as well as trigeminal neuralgia. (Wikipedia)
2-Methyl-1-phenyl-2-propanyl acetate is a flavouring agent
Ligusticide, also known as ligustilide, (E)-isomer or (Z)-ligustilide, is a member of the class of compounds known as isobenzofurans. Isobenzofurans are organic aromatic compounds containing an isobenzofuran moiety. Ligusticide is practically insoluble (in water) and an extremely weak basic (essentially neutral) compound (based on its pKa). Ligusticide can be found in lovage, which makes ligusticide a potential biomarker for the consumption of this food product.
(Z)-3-Butylidene-1(3H)-isobenzofuranone is found in herbs and spices. (Z)-3-Butylidene-1(3H)-isobenzofuranone is a constituent of Angelica glauca
Methocarbamol is only found in individuals that have used or taken this drug. It is a centrally acting muscle relaxant whose mode of action has not been established. It is used as an adjunct in the symptomatic treatment of musculoskeletal conditions associated with painful muscle spasm. (From Martindale, The Extra Pharmacopoeia, 30th ed, p1206)The mechanism of action of methocarbamol in humans has not been established, but may be due to central nervous system depression. It has no direct action on the contractile mechanism of striated muscle, the motor end plate or the nerve fiber.
beta-d-ribosylnicotinate is slightly soluble (in water) and a moderately acidic compound (based on its pKa). beta-d-ribosylnicotinate can be found in a number of food items such as turnip, chanterelle, garland chrysanthemum, and canola, which makes beta-d-ribosylnicotinate a potential biomarker for the consumption of these food products.
Propyl propane thiosulfonate is used as a food additive [EAFUS] ("EAFUS: Everything Added to Food in the United States. [http://www.eafus.com/]")
Asparaginylisoleucine is a dipeptide composed of asparagine and isoleucine. It is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis.
Murrayacinine is found in herbs and spices. Murrayacinine is an alkaloid from the stem bark of Murraya koenigii (curryleaf tree
Ibudilast is an anti-inflammatory and neuroprotective oral agent which shows an excellent safety profile at 60 mg/day and provides significantly prolonged time-to-first relapse and attenuated brain volume shrinkage in patients with relapsing-remitting (RR) and/or secondary progressive (SP) multiple sclerosis (MS). Ibudilast is currently in development in the U.S. (codes: AV-411 or MN-166), but is approved for use as an antiinflammatory in Japan.
Cholesteryl linoleic acid is a cholesteryl ester. A cholesteryl ester is an ester of cholesterol. Fatty acid esters of cholesterol constitute about two-thirds of the cholesterol in the plasma. Cholesterol is a sterol (a combination steroid and alcohol) and a lipid found in the cell membranes of all body tissues, and transported in the blood plasma of all animals. The accumulation of cholesterol esters in the arterial intima (the innermost layer of an artery, in direct contact with the flowing blood) is a characteristic feature of atherosclerosis. Atherosclerosis is a disease affecting arterial blood vessels. It is a chronic inflammatory response in the walls of arteries, in large part to the deposition of lipoproteins (plasma proteins that carry cholesterol and triglycerides). Cholesteryl linoleate is contained in low density lipoprotein and atherosclerotic lesions. The oxidation products of cholesteryl linoleate may cause chronic inflammatory processes. (PMID 9684755, 11950694).
A benzazepine derived from norbelladine. It is found in galanthus and other amaryllidaceae. Galantamine is a cholinesterase inhibitor that has been used to reverse the muscular effects of gallamine triethiodide and tubocurarine, and has been studied as a treatment for Alzheimer's disease and other central nervous system disorders. [PubChem]
Arbutamine, administered through a closed-loop, computer-controlled drug-delivery system, is indicated to elicit acute cardiovascular responses, similar to those produced by exercise, in order to aid in diagnosing the presence or absence of coronary artery disease in patients who cannot exercise adequately.
Methylphenidate is only found in individuals that have used or taken this drug. It is a central nervous system stimulant used most commonly in the treatment of attention-deficit disorders in children and for narcolepsy. Its mechanisms appear to be similar to those of dextroamphetamine. [PubChem]Methylphenidate blocks dopamine uptake in central adrenergic neurons by blocking dopamine transport or carrier proteins. Methylphenidate acts at the brain stem arousal system and the cerebral cortex and causes increased sympathomimetic activity in the central nervous system. Alteration of serotonergic pathways via changes in dopamine transport may result.
Dietary supplement
2-Hydroxy-4-trifluoromethyl benzoic acid is a metabolite of triflusal. Triflusal is a platelet aggregation inhibitor that was discovered and developed in the Uriach Laboratories, and commercialised in Spain since 1981. Currently, it is available in 25 countries in Europe, Asia, Africa and America. It is a drug of the salicylate family but it is not a derivative of acetylsalicylic acid (ASA). Trade names include Disgren, Grendis, Aflen and Triflux (Wikipedia)
Naftifine is only found in individuals that have used or taken this drug. It is a synthetic, broad spectrum, antifungal agent and allylamine derivative for the topical treatment of tinea pedis, tinea cruris, and tinea corporis caused by the organisms Trichophyton rubrum, Trichophyton mentagrophytes, Trichophyton tonsurans and Epidermophyton floccosum.Although the exact mechanism of action against fungi is not known, naftifine appears to interfere with sterol biosynthesis by inhibiting the enzyme squalene 2,3-epoxidase. This inhibition of enzyme activity results in decreased amounts of sterols, especially ergosterol, and a corresponding accumulation of squalene in the cells.
Nicergoline is only found in individuals that have used or taken this drug. It is an ergot derivative that has been used as a cerebral vasodilator and in peripheral vascular disease. It has been suggested to ameliorate cognitive deficits in cerebrovascular disease. [PubChem]Nicergoline acts by inhibiting the postsynaptic alpha(1)-adrenoceptors on vascular smooth muscle. This inhibits the vasoconstrictor effect of circulating and locally released catecholamines (epinephrine and norepinephrine), resulting in peripheral vasodilation. Therefore the mechanism of Nicergoline is to increase vascular circulation in the brain, thereby enhancing the transmission of nerve signals across the nerve fibres, which secrete acetylcholine as a neural transmitter.
The name vitamin B12 is used in two different ways. In a broad sense it refers to a group of cobalt-containing compounds known as cobalamins - cyanocobalamin (an artifact formed as a result of the use of cyanide in the purification procedures), hydroxocobalamin and the two coenzyme forms of B12, methylcobalamin (MeB12) and 5-deoxyadenosylcobalamin (adenosylcobalamin - AdoB12). In a more specific way, the term B12 is used to refer to only one of these forms, cyanocobalamin, which is the principal B12 form used for foods and in nutritional supplements. B12 cannot be made by plants or by animals, as the only type of organisms that have the enzymes required for the synthesis of B12 are bacteria and archaea. The total synthesis of B12 was reported in 1973 by Robert Burns Woodward, and remains one of the classic feats of total synthesis. Cyanocobalamin is a vitamin commonly known as vitamin B12 (or B12 for short).
3-(2-Furanyl)-2-phenyl-2-propenal is a flavourant for tobacco and food product
Nitisinone is only found in individuals that have used or taken this drug. It is a synthetic reversible inhibitor of 4-hydroxyphenylpyruvate dioxygenase. It is used in the treatment of hereditary tyrosinemia type 1. It is sold under the brand name Orfadin. [Wikipedia]Nitisinone is a competitive inhibitor of 4-hydroxyphenyl-pyruvate dioxygenase, an enzyme upstream of fumarylacetoacetate hydrolyase (FAH) in the tyrosine catabolic pathway. By inhibiting the normal catabolism of tyrosine in patients with hereditary tyrosinemia type 1 (HT-1), nitisinone prevents the accumulation of the catabolic intermediates maleylacetoacetate and fumarylacetoacetate.
Nicotine glucuronidation results in an N-quaternary glucuronide in humans. This reaction is catalyzed by uridine diphosphate-glucuronosyltransferase (UGT) enzyme(s) producing (S)-nicotine-N-beta-glucuronide (Nicotine-Gluc). About 3-5% of nicotine is converted to Nicotine-Gluc and excreted in urine in humans.
Naringenin is a flavorless, colorless flavanone, a type of flavonoid. It is the predominant flavanone in grapefruit, and is found in a variety of fruits and herbs. Naringenin has the skeleton structure of a flavanone with three hydroxy groups at the 4', 5, and 7 carbons. It may be found both in the aglycol form, naringenin, or in its glycosidic form, naringin, which has the addition of the disaccharide neohesperidose attached via a glycosidic linkage at carbon 7. Naringenin (not to be confused with naringin) is a flavanone that is considered to have a bioactive effect on human health as antioxidant, free radical scavenger, antiinflammatory, carbohydrate metabolism promoter, immunity system modulater. This substance has also been shown to repair DNA. Scientists exposed cells to 80 micomoles of naringenin per liter, for 24 hours, and found that the amount of hydroxyl damage to the DNA was reduced by 24 percent in that very short period of time. Unfortunately, this bioflavonoid is difficult to absorb on oral ingestion. Only 15% of ingested naringenin will get absorbed, in the human gastrointestinal tract, in the best case scenario. A full glass of orange juice will supply about enough naringenin to achieve a concentration of about 0.5 micromoles per liter. Naringenin is a biomarker for the consumption of citrus fruits.
24,25-Dihydroxyvitamin D (24R,25(OH)2D3) circulates in blood at concentrations about 1000 times higher than 1alpha,25(OH)2D3. 24-Hydroxylase is present in the proximal convoluted tubule cells of the kidney and in virtual all target cells of 1alpha,25(OH)2D3. Interestingly, 1alpha,25(OH)2D3 is a very strong inducer of 24-hydroxylase activity and 24R,25(OH)2D3 formation. Also parathyroid hormone (PTH) regulates 24-hydroxylase activity but in a tissue specific manner, i.e. inhibitory in the kidney while a synergistic effect together with 1alpha,25(OH)2D3 is observed in osteoblasts. Generally, 24-hydroxylation has been considered the first step in the degradation pathway of 1alpha,25(OH)2D3 and 25-(OH)D3. However, through the past decades data have accumulated that 24R,25(OH)2D3 is not merely a degradation product but has effects on its own. Classic studies have demonstrated the significance of 24R,25(OH)2D3 for normal chicken egg hatchability and calcium and phosphorus homeostasis. More recently it became apparent that 24R,25(OH)2D3 also has distinct effects on cartilage in particular the resting zone cells. 24R,25(OH)2D3 stimulates osteocalcin synthesis in human osteoblasts. 24R,25(OH)2D3 plays a role in bone metabolism but that it acts in concert with 1alpha,25(OH)2D3 to obtain an optimal effect. (PMID: 11179746).
Alanylarginine is a dipeptide composed of alanine and arginine. It is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis.
Glutaminylisoleucine is a dipeptide composed of glutamine and isoleucine. It is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis.
N2-Acetylornithine, also known as N(alpha)-acetylornithine, belongs to the class of organic compounds known as N-acyl-L-alpha-amino acids. These are N-acylated alpha-amino acids which have the L-configuration of the alpha-carbon atom. N-Acetylornithine is a minor component of the deproteinized blood plasma of human blood. Human blood plasma contains a variable amount of acetylornithine, averaging 1.1 +/- 0.4 umol/L (range 0.8-0.2 umol/L). Urine contains a very small amount of acetylornithine, approximately 1 nmol/mg creatinine (1 umol/day) (PMID:508804).
Zeranol is isolated from Fusarium species. It is an anabolic agent and estrogenic agent (mainly veterinary use). Zeranol is used as a growth promoter for food animals. It was banned by the EU in 1989, but is still permitted in the USA and some other countries. It may also arise in livestock by ingestion of Fusarium contaminated pasture or feeds
15-Acetyl-4-deoxynivalenol is a mycotoxin produced by Fusarium graminearum and Gibberella zeae.
Acetyldeoxynivalenol is found in cereals and cereal products. Toxin from infected barle
5a-Cholestane-3a,7a,12a,25-tetrol is a bile alcohols which is excreted mainly as glucurono-conjugates in bile and urine, and as unconjugated form in feces of patients with cerebrotendinous xanthomatosis (PMID 3700361).
A meperidine congener used as an antidiarrheal, usually in combination with atropine. At high doses, it acts like morphine. Its unesterified metabolite difenoxin has similar properties and is used similarly. It has little or no analgesic activity. This medication is classified as a Schedule V under the Controlled Substances Act by the Food and Drug Administration (FDA) and the DEA in the United States when used in preparations. When diphenoxylate is used alone, it is classified as a Schedule II.
Cinnamyl acetate is found in ceylan cinnamon. Cinnamyl acetate is a constituent of Cassia and basil oils. Also present in guava fruit and peel, starfruit, melon and strawberry jam. Cinnamyl acetate is a flavouring ingredient
N-(3-Methylbutyl)acetamide is found in alcoholic beverages. N-(3-Methylbutyl)acetamide is found in wine
1-Hydroxylorcaserin is a metabolite of lorcaserin. Lorcaserin (APD-356, trade name Lorqess) is a weight-loss drug developed by Arena Pharmaceuticals. It has serotonergic properties and acts as an anorectic. On 22 December 2009 a New Drug Application (NDA) was submitted to the Food and Drug Administration (FDA) in the United States. On 16 September 2010, an FDA advisory panel voted to recommend against approval of the drug based on concerns over both safety and efficacy. (Wikipedia)
. Bicine is a general purpose buffer for biological research. Useful pH range is 7.6 - 9.0. Its applications include: tissue culture,phosphorylation and photophosphorylation, fixative transmission electron microscopy, protein synthesis and preventing binding to non-receptor materials. It is a degradation product of alkanolamine and alkylalkanolamine solutions.
Fructose 6-phosphate (F6P) belongs to the class of organic compounds known as hexose phosphates. These are carbohydrate derivatives containing a hexose substituted by one or more phosphate groups. F6P is a derivative of fructose, which has been phosphorylated at the 6-hydroxy group. Fructose 6-phosphate is a fundamental metabolite and exists in all living species, ranging from bacteria to plants to humans. The great majority of glucose is converted to fructose 6-phosphate as part of the glycolytic metabolic pathway (glycolysis). Specifically, F6P is produce is produced by the isomerisation of glucose 6-phosphate via the enzyme phosphoglucose isomerase. F6P is in turn further phosphorylated to fructose-1,6-bisphosphate by the enzyme phosphofructokinase-1. Glycolysis is the metabolic pathway that converts glucose into pyruvic acid. The free energy released in this process is used to form ATP and reduced nicotinamide adenine dinucleotide (NADH). In addition to its key involvement in glycolysis, fructose 6-phosphate can also be biosynthesized from glucosamine 6-phosphate via the enzyme glucosamine-6-phosphate isomerase 1. In addition, fructose 6-phosphate and L-glutamine can be converted into glucosamine 6-phosphate and L-glutamic acid through the action of the enzyme glutamine--fructose-6-phosphate aminotransferase.
Harmol is found in fruits. Harmol is an alkaloid from Elaeagnus angustifolia (Russian olive) and Passiflora incarnata (maypops).
Pyrocatechol, often known as catechol or benzene-1,2-diol, is a benzenediol, with formula C6H4(OH)2. It was first prepared in 1839 by H. Reinsch by distilling catechin (the juice of Mimosa catechu). This colourless compound occurs naturally, but about 20000 tons are manufactured each year, mainly as precursors to pesticides, flavors, and fragrances. Its sulfonic acid is often present in the urine of many mammals. Small amounts of catechol occur naturally in fruits and vegetables, along with the enzyme polyphenol oxidase. Upon mixing the enzyme with the substrate and exposure to oxygen (as when a potato or apple is cut), the colorless catechol oxidizes to reddish-brown benzoquinone derivatives. The enzyme is inactivated by adding an acid, such as lemon juice, or by refrigeration. Excluding oxygen also prevents the browning reaction. Catechol melts at 28 °C and boils at 250 °C. It is employed in medicine as an expectorant. The dimethyl ether or veratrol is also used in medicine. Many other pyrocatechin derivatives have been suggested for therapeutic application. Pyrocatechol has also been found to be a microbial metabolite in Escherichia, Mycobacterium and Pseudomonas (PMID:19300498; PMID:25281236).
Leukotriene B5 (LTB5) is a 5-lipoxygenase metabolite of arachidonic (AA) and eicosapentaenoic acid (EPA), involved in numerous inflammatory diseases and possesses a substantially less potent inflammatory effect than LTB4. Binding of LTB5 to human neutrophil LTB4 high affinity binding sites is lower than that of LTB4. Polymorphonuclear leukocytes isolated from volunteers who ingested eicosapentaenoic acid (EPA) form LTB5. Enrichment of human neutrophils with EPA, by dietary supplementation for at least 3 weeks, reduces their formation of LTB4 ex vivo. LTB5 is catabolized to 20-OH-LTB5, which in turn is metabolized to 20-COOH-LTB5. Presumably the same enzyme systems are involved in the catabolism of LTB5 that are responsible for catabolism of LTB4. Fish oil supplementation has a protective effect on exercise-induced bronchoconstriction (EIB) in elite athletes, which may be attributed to its antiinflammatory properties due to a significant reduction in LTB4 and a significant increase in LTB5 generation from activated polymorphonuclear leukocytes (PMNLs). (PMID: 1964169, 15866528, 2538061, 16424411). Leukotrienes are eicosanoids. The eicosanoids consist of the prostaglandins (PGs), thromboxanes (TXs), leukotrienes (LTs), and lipoxins (LXs). The PGs and TXs are collectively identified as prostanoids. Prostaglandins were originally shown to be synthesized in the prostate gland, thromboxanes from platelets (thrombocytes), and leukotrienes from leukocytes, hence the derivation of their names. All mammalian cells except erythrocytes synthesize eicosanoids. These molecules are extremely potent, able to cause profound physiological effects at very dilute concentrations. All eicosanoids function locally at the site of synthesis, through receptor-mediated G-protein linked signalling pathways.
3-Hexen-1-ol, also known as 1-hydroxy-3-hexene, is a colourless oily liquid with an intense grassy-green odour of freshly cut green grass and leaves. It is produced in small amounts by most plants and it acts as an attractant to many predatory insects. 3-Hexen-1-ol is a very important aroma compound that is used in fruit and vegetable flavours and in perfumes. The yearly production is about 30 tonnes. 3-Hexen-1-ol is found in black elderberry.
dehydrofelodipine is a metabolite of felodipine. Felodipine is a calcium channel blocker (calcium antagonist), a drug used to control hypertension (high blood pressure). It is marketed under the brand name Plendil by AstraZeneca and Renedil by Sanofi-Aventis. The formulation patent for the substance expired in 2007. AstraZeneca dropped Plendil from its support and AZ&Me free Rx access program in October 2008. (Wikipedia)
16-alpha-hydroxypregnenolone, also known as 16A OH-Preg or (3beta,16alpha)-3,16-dihydroxypregn-5-en-20-one, is classified as a gluco/mineralocorticoid, a progestogin or aprogestogin derivative. Gluco/mineralocorticoids are steroids with a structure based on a hydroxylated prostane moiety. Thus, 16-alpha-hydroxypregnenolone is a steroid or more correctly a 16alpha-hydroxy steroid. 16-alpha-hydroxypregnenolone is also classified as a hydroxypregnenolone. A hydroxypregnenolone is a pregnenolone substituted by an alpha-hydroxy group at position 16. It is a steroid molecule that is produced by all vertebrates. In humans, 16-alpha-hydroxypregnenolone can be found primarily in blood, urine and in human umbilical cord tissue. 16-alpha-Hydroxypregnenolone is a normal urinary metabolite with increased total excretion in newborn infants with congenital adrenal hyperplasia due to 21-hydroxylase deficiency (PMID 6980322). It is therefore an important urinary marker for the occurrence of an adrenal 21-hydroxylase-deficiency. Its levels are an indication for the effectiveness of medication (cortisol supplement) against this disease. (PMID: 10399855).
(E)-Monocrotophos is an Agricultural insecticide with both systemic and contact actio
3,5-Dimethyl-1,2-cyclopentanedione is found in animal foods. 3,5-Dimethyl-1,2-cyclopentanedione is a constituent of coffee and cooked cured pork. 3,5-Dimethyl-1,2-cyclopentanedione is a flavouring agent.
High concentration of aspartyl-L-proline is found in the urine of patients with prolidase deficiency. Prolidase deficiency is an inborn error of metabolism which can cause mental retardation and severe skin ulcers in affected individuals. (Scriver's OMMBID; Wikipedia).
desmethylastemizole is a metabolite of astemizole. Astemizole (R43512, marketed under the brand name Hismanal) was a second generation antihistamine drug which has a long duration of action. Astemizole was discovered by Janssen Pharmaceutica in 1977. It has been withdrawn from the market in most countries because of rare but potentially fatal side effects. (Wikipedia)
2-Acetylthiazole is found in alcoholic beverages. 2-Acetylthiazole is an important flavour component; antioxidant. 2-Acetylthiazole is present in asparagus, kohlrabi, cooked potatoes, roast turkey, raw chicken, cooked beef, pork liver, beer, whisky, heated beans, various mushrooms, rice bran and maize.
7-Hydroxygliclazide is only found in individuals that have used or taken Gliclazide. 7-Hydroxygliclazide is a metabolite of Gliclazide. 7-hydroxygliclazide belongs to the family of Benzenesulfonamides. These are organic compounds containing a sulfonamide group that is S-linked to a benzene ring.
6-demethylgriseofulvin belongs to the family of Methoxyphenols and Derivatives. These are compounds containing a methoxy group attached to the benzene ring of a phenol moiety.
5-Hydroxy-N-formylkynurenine is an intermediate in tryptophan metabolism. 5-Hydroxy-N-formylkynurenine is converted from 5-Hydroxy-L-tryptophan via the enzyme, indoleamine 2,3-dioxygenase [EC:1.13.11.52].
Shikimic acid 3-phosphate is a member of the class of compounds known as monoalkyl phosphates. Monoalkyl phosphates are organic compounds containing a phosphate group that is linked to exactly one alkyl chain. Shikimic acid 3-phosphate is soluble (in water) and a moderately acidic compound (based on its pKa). Shikimic acid 3-phosphate can be found in a number of food items such as date, hard wheat, common sage, and peppermint, which makes shikimic acid 3-phosphate a potential biomarker for the consumption of these food products. Shikimic acid 3-phosphate exists in E.coli (prokaryote) and yeast (eukaryote).
3-Aminopropanal is a reactive aldehyde that mediates progressive neuronal necrosis and glial apoptosis. (PMID 11943872). Increased activity of polyamine oxidase catabolizes polyamines (such as spermine, spermidine and putrescine) to produce 3-aminopropanal. (PMID 15246852).
Methylguanidine (MG) is a guanidine in which one of the amino hydrogens of guanidine itself is substituted by a methyl group.  Methylguanidine is a guanidine compound deriving from protein catabolism. It is also a product of putrefaction. Methylguanidine has a role as a metabolite, an EC 1.14.13.39 (nitric oxide synthase) inhibitor and as a uremic toxin. It has been identified as a uremic toxin according to the European Uremic Toxin Working Group (PMID:22626821). It accumulates in renal failure, however it also exhibits anti-inflammatory effects. Methylguanidine is synthesized from creatinine concomitant with the synthesis of hydrogen peroxide from endogenous substrates in peroxisomes. Recent evidence suggests that methylguanidine significantly inhibits iNOS activity and TNF- release. This means that methylguandine can attenuate the degree of inflammation and tissue damage associated with endotoxic shock.
4-Methylcatechol, also known as homocatechol or toluene-3,4-diol, belongs to the class of organic compounds known as catechols. Catechols are compounds containing a 1,2-benzenediol moiety. Outside of the human body, 4-Methylcatechol is found, on average, in the highest concentration within a few different foods such as coffee and cocoa powders and in a lower concentration in beers. 4-Methylcatechol has also been detected, but not quantified in eggplants. This could make 4-methylcatechol a potential biomarker for the consumption of these foods. Recent studies have suggested that a lack of brain-derived neurotrophic factor (BDNF) in the limbic system may cause neuropathic pain (PMID:22198556). It is both a substrate and a suicide inhibitor of catechol 2,3-dioxygenase (PMID:15006807). 4-Methylcatechol is a metabolite of homoprotocatechuic acid (PMID:4974346). 4-Methylcatechol is known to induce the production of BDNF.
3-Hydroxyquinine is a major metabolite of quinine. The formation of 3-hydroxyquinine is catalysed by cytochrome P450 3A4.
(-)-Fumigaclavine B is a mycotoxin from Aspergillus fumigatus and Rhizopus arrhizu
D-4-O-Methyl-myo-inositol is found in common pea. D-4-O-Methyl-myo-inositol is isolated from Vigna catjang and Medicago sativa (alfalfa
D-4-O-Methyl-myo-inositol is found in common pea. D-4-O-Methyl-myo-inositol is isolated from Vigna catjang and Medicago sativa (alfalfa
Aerobactin is a virulence factor for enteric bacteria found occasionally in humans, and is produced by bacteria such as Enterobacter cloacae. E. cloacae is part of the normal intestinal floras of many individuals and not a primary human pathogen but has been considered to be an important cause of nosocomial infections. Aerobactin secretion in vivo could be an important step in the stages of the infection cycle during which intestine-populating opportunistic bacteria effectively colonize the gut, penetrate the mucous layer covering the intestinal villi, translocate out of intestinal lumen through the epithelial cells, and finally spread to organs within which they may survive. (PMID: 9453621, 8752377).
Malathion monocarboxylic acid is a metabolite of malathion. Malathion is an organophosphate parasympathomimetic which binds irreversibly to cholinesterase. Malathion is an insecticide of relatively low human toxicity; however, a 2010 study has shown that children with higher levels of organophosphate pesticide metabolites in their urine are more likely to have attention deficit hyperactivity disorder. In the former USSR it was known as carbophos, in New Zealand and Australia as maldison and in South Africa as mercaptothion. (Wikipedia)
Acetaldehyde scavenger for polyethylene beverage bottles.
Rosmarinic acid is an ester of caffeic acid and 3,4-dihydroxyphenyllactic acid. It is commonly found in species of the Boraginaceae and the subfamily Nepetoideae of the Lamiaceae. It is a red-orange powder that is slightly soluble in water, but well soluble is most organic solvents. Rosmarinic acid is one of the polyphenolic substances contained in culinary herbs such as perilla (Perilla frutescens L.), rosemary (Rosmarinus officinalis L.), sage (Salvia officinalis L.), mint (Mentha arvense L.), and basil (Ocimum basilicum L.). These herbs are commonly grown in the garden as kitchen herbs, and while used to add flavor in cooking, are also known to have several potent physiological effects (PMID: 12482446, 15120569). BioTransformer predicts that rosmarinic acid is a product of methylrosmarinic acid metabolism via a hydrolysis-of-carboxylic-acid-ester-pattern1 reaction occurring in humans and human gut microbiota and catalyzed by the liver carboxylesterase 1 (P23141) enzyme (PMID: 30612223).
QS 21 is a constituent of the bark of Quillaja saponaria (soap-bark tree).
Germacranolides are a group of sesquiterpene lactones. Germacranolide is found in burdock and dandelion.
Leucocyanidin, also known as 3,3',4,4',5,7-flavanhexol or resivit, is a member of the class of compounds known as catechins. Catechins are compounds containing a catechin moiety, which is a 3,4-dihydro-2-chromene-3,5.7-tiol. Thus, leucocyanidin is considered to be a flavonoid lipid molecule. Leucocyanidin is slightly soluble (in water) and a very weakly acidic compound (based on its pKa). Leucocyanidin can be found in a number of food items such as climbing bean, black mulberry, corn salad, and caraway, which makes leucocyanidin a potential biomarker for the consumption of these food products. Leucocyanidin is a colorless chemical compound that is a member of the class of natural products known as leucoanthocyanidins .
Bitter constituent of Quassia amara (Surinam quassia) and Picrasma excelsa (Jamaican quassiawood) Quassin is a white bitter, crystalline substance extracted from the quassia tree. It is the bitterest substance found in nature with a bitter threshold of 0.08ppm and it is 50 times more bitter than quinine.
Imidapril, also known as Tanatril (trade name), belongs to a class of long-acting, non-sulfhydryl angiotensin-converting enzyme (ACE) inhibitors (PMID: 12177688). It is a prodrug that is widely used in the treatment of mild to moderate essential hypertension (PMID: 17547476). A prodrug is a drug that must be metabolized in the body (via the gut or the liver) to become active. Imidapril is also prescribed to treat chronic congestive heart failure (CHF), acute myocardial infarction (AMI), and diabetic nephropathy (PMID: 12177688, 17094051). It functions through preventing angiotensin II formation, via inhibition of the angiotensin-converting enzyme (ACE), that results in reduction of peripheral resistance and a reduction in systemic blood pressure (BP) (PMID: 17547476). Imidapril is only found in individuals that have used or taken this drug.
Cadabicine methyl ether is found in fruits. Cadabicine methyl ether is an alkaloid from the stem bark of the famine food Cadaba farinosa (luquata sigmama).
Isoeugenol phenylacetate is a flavouring ingredient.
Grifolin is found in mushrooms. Grifolin is isolated from the edible maitake mushroom (Grifola confluens
Docosatrienoic acid, also known as docosatrienoate, belongs to the class of organic compounds known as very long-chain fatty acids. These are fatty acids with an aliphatic tail that contains at least 22 carbon atoms. Docosatrienoic acid is a very hydrophobic molecule, is practically insoluble (in water), and is relatively neutral. Application of docosatrienoic acid was shown to dose-dependently decrease the peak K+ current amplitude and accelerate the potassium activation and inactivation kinetics at all membrane potentials.
Neotigogenin is found in fenugreek. Neotigogenin is a constituent of currant tomato (Lycopersicon pimpinellifolium)
O-Desmethylnaproxen is only found in individuals that have used or taken Naproxen. O-Desmethylnaproxen is a metabolite of Naproxen. O-desmethylnaproxen belongs to the family of Phenylacetic Acid Derivatives. These are compounds containing a phenylacetic acid moiety, which consists of a phenyl group substituted at the second position by an acetic acid.
Ketoprofen is only found in individuals that have used or taken this drug. It is a propionic acid derivative and is a nonsteroidal anti-inflammatory agent (NSAIA) with analgesic and antipyretic properties. The anti-inflammatory effects of ketoprofen are believed to be due to inhibition cylooxygenase-2 (COX-2), an enzyme involved in prostaglandin synthesis via the arachidonic acid pathway. This results in decreased levels of prostaglandins that mediate pain, fever and inflammation. Ketoprofen is a non-specific cyclooxygenase inhibitor and inhibition of COX-1 is thought to confer some of its side effects, such as GI upset and ulceration. Ketoprofen is thought to have anti-bradykinin activity, as well as lysosomal membrane-stabilizing action. Antipyretic effects may be due to action on the hypothalamus, resulting in an increased peripheral blood flow, vasodilation, and subsequent heat dissipation.
Anagrelide is only found in individuals that have used or taken this drug. It is a drug used for the treatment of essential thrombocytosis (ET; essential thrombocythemia). It also has been used in the treatment of chronic myeloid leukemia. [Wikipedia]The mechanism by which anagrelide reduces blood platelet count is still under investigation. Studies in patients support a hypothesis of dose-related reduction in platelet production resulting from a decrease in megakaryocyte hypermaturation. In blood withdrawn from normal volunteers treated with anagrelide, a disruption was found in the postmitotic phase of megakaryocyte development and a reduction in megakaryocyte size and ploidy. At therapeutic doses, anagrelide does not produce significant changes in white cell counts or coagulation parameters, and may have a small, but clinically insignificant effect on red cell parameters. Anagrelide inhibits cyclic AMP phosphodiesterase III (PDEIII). PDEIII inhibitors can also inhibit platelet aggregation. However, significant inhibition of platelet aggregation is observed only at doses of anagrelide higher than those required to reduce platelet count.
(R)-3-Hydroxy-5-phenylpentanoic acid is isolated from the leaves of Populus balsamifera (balsam poplar
(+)-Setoclavine is found in cereals and cereal products. (+)-Setoclavine is an alkaloid from ergot found on Pennisetum typhoideum (pearl millet).
Camalexin is found in fats and oils. Camalexin is an alkaloid from the leaves of Camelina sativa (false flax) infected by the fungus Alternaria brassica
1-Methyladenosine, also known as M1A, belongs to the class of organic compounds known as purine nucleosides. Purine nucleosides are compounds comprising a purine base attached to a ribosyl or deoxyribosyl moiety. Precise m6A mapping by m6A-CLIP/IP (briefly m6A-CLIP) revealed that a majority of m6A locates in the last exon of mRNAs in multiple tissues/cultured cells of mouse and human, and the m6A enrichment around stop codons is a coincidence that many stop codons locate round the start of last exons where m6A is truly enriched. The methylation of adenosine is directed by a large m6A methyltransferase complex containing METTL3 as the SAM-binding sub-unit. Insulin-like growth factor-2 mRNA-binding proteins 1, 2, and 3 (IGF2BP1-3) are reported as a novel class of m6A readers.
Thulium, also known as 69tm or tulio, is a member of the class of compounds known as homogeneous lanthanide compounds. Homogeneous lanthanide compounds are inorganic compounds containing only metal atoms, with the largest atom being a lanthanide atom. Thulium is a chemical element with symbol Tm and atomic number 69. It is the thirteenth and third-last element in the lanthanide series. Like the other lanthanides, the most common oxidation state is +3, seen in its oxide, halides and other compounds; because it occurs so late in the series, however, the +2 oxidation state is also stabilized by the nearly full 4f shell that results. In aqueous solution, like compounds of other late lanthanides, soluble thulium compounds form coordination complexes with nine water molecules.
Ethyl acetoacetate (EAA) is found in coffee and coffee products as well as in strawberry and yellow passion fruit juice. Ethyl acetoacetate is a flavouring agent. The organic compound ethyl acetoacetate is the ethyl ester of acetoacetic acid. It is mainly used as a chemical intermediate in the production of a wide variety of compounds, such as amino acids, analgesics, antibiotics, antimalarial agents, antipyrine, aminopyrine, and vitamin B1, as well as in the manufacture of dyes, inks, lacquers, perfumes, plastics, and yellow paint pigments (Wikipedia).
2-Amino-3,4-dimethylimidazo[4,5-f]quinoline is found in animal foods. 2-Amino-3,4-dimethylimidazo[4,5-f]quinoline is isolated from sardines, beef extract and hamburger, probably widely distributed in cooked food
2-Amino-3,4-dimethylimidazo[4,5-f]quinoline is found in animal foods. 2-Amino-3,4-dimethylimidazo[4,5-f]quinoline is isolated from sardines, beef extract and hamburger, probably widely distributed in cooked food
An antineoplastic antimetabolite that is metabolized to fluorouracil when administered by rapid injection. Floxuridine is available as a sterile, nonpyrogenic, lyophilized powder for reconstitution. When administered by slow, continuous, intra-arterial infusion, it is converted to floxuridine monophosphate. It has been used to treat hepatic metastases of gastrointestinal adenocarcinomas and for palliation in malignant neoplasms of the liver and gastrointestinal tract. [PubChem]
Isoacitretin is an oral retinoid effective in the treatment of psoriasis. It is the major metabolite of etretinate with the advantage of a much shorter half-life when compared with etretinate (Pubchem).
Ethyl hydrogen sulfate is found in alcoholic beverages. Ethyl hydrogen sulfate is found in wine
Leishmaniasis is a neglected disease caused by Leishmania, an intracellular protozoan parasite which possesses a unique thiol metabolism based on trypanothione. (PMID: 22928053) Trypanosomatids, the causative agents of several tropical diseases, rely on trypanothione as principal low molecular mass thiol, and their glutaredoxins readily react with the unique bis(glutathionyl) spermidine conjugate. (PMID: 22978520) Among the potential molecular target, Trypanothione reductase (TR) is considered an ideal enzyme since it is involved in the unique thiol-based metabolism observed in the Trypanosomatidae family and is a validated target for the search of antitrypanosomatidae drugs. (PMID: 23410156)
4-Hydroxy-3-methoxy-2,10-bisaboladien-9-one is found in herbs and spices. 4-Hydroxy-3-methoxy-2,10-bisaboladien-9-one is a constituent of Curcuma xanthorrhiza (Java turmeric).
1-Hydroxyepiacorone is found in herbs and spices. 1-Hydroxyepiacorone is a constituent of Acorus calamus (sweet flag)
Cadralazine is an antihypertensive of the hydrazinophthalazine chemical class.
5,8-Epoxy-5,8-dihydro-10'-apo-b,y-carotene-3,10'-diol is found in citrus. 5,8-Epoxy-5,8-dihydro-10'-apo-b,y-carotene-3,10'-diol is isolated from Persea americana (avocado) and from Valencia orange juice.
Triprolidine is only found in individuals that have used or taken this drug. It is the first generation histamine H1 antagonist used in allergic rhinitis; asthma; and urticaria. It is a component of cough and cold medicines. It may cause drowsiness. [PubChem]Triprolidine binds to the histamine H1 receptor. This blocks the action of endogenous histamine, which subsequently leads to temporary relief of the negative symptoms brought on by histamine.
Oenanthic ether is an odorous substance (ester) (PMID 15474656) present in human sweat (PMID 8887339).
2,3-Butanediol is an isomer of butanediol. The 2R,3R stereoisomer of 2,3-butanediol is produced by a variety of microorganisms, in a process known as butanediol fermentation. 2,3-Butanediol fermentation is the anaerobic fermentation of glucose with 2,3-butanediol as one of the end products. The overall stoichiometry of the reaction is 2 pyruvate + NADH --> 2CO2 + 2,3-butanediol. Butanediol fermentation is typical for Enterobacter species or microbes found in the gut. 2,3-butanediol has been identified in the sera of alcoholics and it may be a specific marker of alcohol abuse (PMID:6139706). In humans, 2,3-butanediol is oxidized to acetyl-CoA via acetoin. 2,3-Butanediol is also found in cocoa butter. 2,3-Butanediol can also be found in Bacillus, Klebsiella and Serratia (PMID:21272631).
Ethyl acrylate is an organic compound with the formula CH2CHCO2CH2CH3. It is the ethyl ester of acrylic acid. It is a colourless liquid with a characteristic acrid odor. Ethyl acrylate is found in pineapple. Ethyl acrylate is a flavouring ingredient Although there are some reports claiming that ethyl acrylate is a carcinogen, major respected bodies regard the evidence of human carcinogenicity as weak and/or inconsistent. The International Agency for Research on Cancer stated, "Overall evaluation, Ethyl acrylate is possibly carcinogenic to humans (Group 2B)." The United States Environmental Protection Agency (EPA) states, "Human studies on occupational exposure to ethyl acrylate have suggested a relationship between exposure to the chemical(s) and colorectal cancer, but the evidence is conflicting and inconclusive. In a study by the National Toxicology Program (NTP), increased incidences of squamous cell papillomas and carcinomas of the forestomach were observed in rats and mice exposed via gavage (experimentally placing the chemical in the stomach). However, the NTP recently determined that these data were not relevant to human carcinogenicity and removed ethyl acrylate from its list of carcinogens." (Occupational exposure generally involves exposure that occurs regularly, over an extended period of time). Ethyl acrylate is an organic compound primarily used in the preparation of various polymers. It is a clear liquid with an acrid penetrating odor. The human nose is capable of detecting this odor at a thousand times lower concentration then is considered harmful if continuously exposed for some period of time.
4-Hydroxypropofol is only found in individuals that have used or taken Propofol. 4-Hydroxypropofol is a metabolite of Propofol. 4-hydroxypropofol belongs to the family of Cumenes. These are aromatic compounds containing a prop-2-ylbenzene moiety.
Naloxone is only found in individuals that have used or taken this drug. It is a specific opiate antagonist that has no agonist activity. It is a competitive antagonist at mu, delta, and kappa opioid receptors. [PubChem]While the mechanism of action of naloxone is not fully understood, the preponderance of evidence suggests that naloxone antagonizes the opioid effects by competing for the same receptor sites, especially the opioid mu receptor. Recently, naloxone has been shown to bind all three opioid receptors (mu, kappa and gamma) but the strongest binding is to the mu receptor.
Silibinin is found in coffee and coffee products. Silibinin is isolated from Silybum marianum (milk thistle
1-(1Z-octadecenyl)-sn-glycerol is an ether lipid. Ether lipids are lipids in which one or more of the carbon atoms on glycerol is bonded to an alkyl chain via an ether linkage, as opposed to the usual ester linkage. Plasmalogens are glycerol ether phospholipids. They are of two types, alkyl ether (-O-CH2-) and alkenyl ether (-O-CH=CH-). Dihydroxyacetone phosphate (DHAP) serves as the glycerol precursor for the synthesis of plasmalogens. Three major classes of plasmalogens have been identified: choline, ethanolamine and serine derivatives. Ethanolamine plasmalogen is prevalent in myelin. Choline plasmalogen is abundant in cardiac tissue. Usually, the highest proportion of the plasmalogen form is in the ethanolamine class with rather less in choline, and commonly little or none in other phospholipids such as phosphatidylinositol. In choline plasmalogens of most tissues, a higher proportion is often of the O-alkyl rather than the O-alkenyl form, but the reverse tends to be true in heart lipids. In animal tissues, the alkyl and alkenyl moieties in both non-polar and phospholipids tend to be rather simple in composition with 16:0, 18:0 and 18:1 (double bond in position 9) predominating. Ether analogues of triacylglycerols, i.e. 1-alkyldiacyl-sn-glycerols, are present at trace levels only if at all in most animal tissues, but they can be major components of some marine lipids.
Palmitoyl glucuronide is a natural human metabolite of Palmitic acid generated in the liver by UDP glucuonyltransferase. Glucuronidation is used to assist in the excretion of toxic substances, drugs or other substances that cannot be used as an energy source. Glucuronic acid is attached via a glycosidic bond to the substance, and the resulting glucuronide, which has a much higher water solubility than the original substance, is eventually excreted by the kidneys.
DG(16:0/22:4(7Z,10Z,13Z,16Z)/0:0) is a diglyceride, or a diacylglycerol (DAG). It is a glyceride consisting of two fatty acid chains covalently bonded to a glycerol molecule through ester linkages. Diacylglycerols can have many different combinations of fatty acids attached at both the C-1 and C-2 positions. DG(16:0/22:4(7Z,10Z,13Z,16Z)/0:0), in particular, consists of one chain of palmitic acid at the C-1 position and one chain of adrenic acid at the C-2 position. The palmitic acid moiety is derived from fish oils, milk fats, vegetable oils and animal fats, while the adrenic acid moiety is derived from animal fats. Mono- and diacylglycerols are common food additives used to blend together certain ingredients, such as oil and water, which would not otherwise blend well. Dacylglycerols are often found in bakery products, beverages, ice cream, chewing gum, shortening, whipped toppings, margarine, and confections. Synthesis of diacylglycerol begins with glycerol-3-phosphate, which is derived primarily from dihydroxyacetone phosphate, a product of glycolysis (usually in the cytoplasm of liver or adipose tissue cells). Glycerol-3-phosphate is first acylated with acyl-coenzyme A (acyl-CoA) to form lysophosphatidic acid, which is then acylated with another molecule of acyl-CoA to yield phosphatidic acid. Phosphatidic acid is then de-phosphorylated to form diacylglycerol.Diacylglycerols are precursors to triacylglycerols (triglyceride), which are formed by the addition of a third fatty acid to the diacylglycerol under the catalysis of diglyceride acyltransferase. Since diacylglycerols are synthesized via phosphatidic acid, they will usually contain a saturated fatty acid at the C-1 position on the glycerol moiety and an unsaturated fatty acid at the C-2 position.
Perhexiline is only found in individuals that have used or taken this drug. It is a coronary vasodilator used especially for angina of effort. It may cause neuropathy and hepatitis. [PubChem]Perhexiline binds to the mitochondrial enzyme carnitine palmitoyltransferase (CPT)-1 and CPT-2. It acts by shifting myocardial substrate utilisation from long chain fatty acids to carbohydrates through inhibition of CPT-1 and, to a lesser extent, CPT-2, resulting in increased glucose and lactate utilization. This results in increased ATP production for the same O2 consumption as before and consequently increases myocardial efficiency.
Endalin belongs to the family of Pyrimidine Nucleosides and Analogues. These are compounds comprising a pyrimidine base attached to a sugar.
Clupanodonyl coa, also known as 7,10,13,16,19-all-cis-Docosapentaenoyl-CoA or all-cis-7,10,13,16,19-Docosapentaenoyl-coenzyme A, is classified as a member of the very long-chain fatty acyl coas. Very long-chain fatty acyl CoAs are acyl CoAs where the group acylated to the coenzyme A moiety is a very long aliphatic chain of 22 carbon atoms or more. Clupanodonyl coa is considered to be a practically insoluble (in water) and an extremely strong acidic compound. Clupanodonyl coa can be found anywhere throughout a human cell.
This compound belongs to the family of Acyl CoAs. These are organic compounds contaning a coenzyme A substructure linked to another moeity through an ester bond.
Haloperidol glucuronide is a metabolite of haloperidol. Haloperidol is a typical antipsychotic. It is in the butyrophenone class of antipsychotic medications and has pharmacological effects similar to the phenothiazines. Haloperidol is an older antipsychotic used in the treatment of schizophrenia and acute psychotic states and delirium. (Wikipedia)
3-Methoxy-4-hydroxyphenylethyleneglycol sulfate (MHPG-SO4) is the major metabolite of noradrenaline in serum. Chronic schizophrenics have lower serum levels than healthy individuals. Treatment of both groups with 7 daily 3-mg doses of haloperidol caused similar decreases in MHPG-SO4 concentration (PMID: 7343757). In human urine, MHPG-SO4 constitutes 44% of the total 3-methoxy-4-hydroxyphenylethylene glycol (PMID: 7379456).
Systemic agricultural nematocide. Cholinesterase inhibitor Fenamiphos is an organophosphate acetylcholinesterase inhibitor used as an insecticide
9-Octadecenoic acid 1-[(phosphonoxy)methyl]-1,2-ethanediyl ester is classified as a Natural Food Constituent (code WA) in the DF
Paraldehyde is used as a food additive [EAFUS] ("EAFUS: Everything Added to Food in the United States. [http://www.eafus.com/]")
cyclic Melatonin is a metabolite of melatonin. Melatonin Listen/ˌmɛləˈtoʊnɪn/, also known chemically as N-acetyl-5-methoxytryptamine, is a naturally occurring compound found in animals, plants, and microbes. In animals, circulating levels of the hormone melatonin vary in a daily cycle, thereby allowing the entrainment of the circadian rhythms of several biological functions. (Wikipedia)
2,3-Butanediol is an isomer of butanediol. The 2R,3R stereoisomer of 2,3-butanediol is produced by a variety of microorganisms, in a process known as butanediol fermentation. 2,3-Butanediol fermentation is the anaerobic fermentation of glucose with 2,3-butanediol as one of the end products. The overall stoichiometry of the reaction is 2 pyruvate + NADH --> 2CO2 + 2,3-butanediol. Butanediol fermentation is typical for Enterobacter species or microbes found in the gut. 2,3-butanediol has been identified in the sera of alcoholics and it may be a specific marker of alcohol abuse (PMID:6139706). In humans, 2,3-butanediol is oxidized to acetyl-CoA via acetoin. 2,3-Butanediol is also found in cocoa butter. 2,3-Butanediol can also be found in Bacillus, Klebsiella and Serratia (PMID:21272631).
25-O-Desacetyl rifabutin is a metabolite of rifabutin. Rifabutin (Rfb) is a bactericidal antibiotic drug primarily used in the treatment of tuberculosis. The drug is a semi-synthetic derivative of rifamycin S. Its effect is based on blocking the DNA-dependent RNA-polymerase of the bacteria. It is effective against Gram-positive and some Gram-negative bacteria, but also against the highly resistant Mycobacteria, e.g. Mycobacterium tuberculosis, M. leprae and M. avium intracellulare. (Wikipedia)
Amdinocillin is only found in individuals that have used or taken this drug. It is an amidinopenicillanic acid derivative with broad spectrum antibacterial action. It is poorly absorbed if given orally and is used in urinary infections and typhus. [PubChem]Amdinocillin is a stong and specific antagonist of Penicillin Binding Protein-2 (PBP 2). It is active against gram negative bacteria, preventing cell wall synthesis by inhibiting the activity of PBP2. PBP2 is a peptidoglycan elongation initiating enzyme. Peptidoglycan is a polymer of sugars and amino acids that is the main component of bacterial cell walls.
Isoeugenol is an isomer of eugenol, wherein the double bond on the alkyl chain is shifted by one carbon. It also known as propenylgualacol, belongs to the class of organic compounds known as methoxyphenols. Methoxyphenols are compounds containing a methoxy group attached to the benzene ring of a phenol moiety. Isoeugenol is also classified as a phenylpropene, a propenyl-substituted guaiacol. Isoeugenol may occur as either the cis (Z) or trans (E) isomer. Trans (E) isoeugenol is crystalline while cis (Z) isoeugenol is a pale, yellow liquid. Isoeugenol is very slightly soluble in water and soluble in organic solvents. It has a spicy, sweet, carnation-like odour and tastes of sweet spice and clove. Isoeugenol is a widely used food flavoring agent and a perfuming agent. As a food flavoring agent, it is responsible for the flavor of nutmeg (in pumpkin pies), As a fragrance, it is extensively used as a scent agent in consumer products such as soaps, shampoos, perfumes, detergents and bath tissues (often labeled as ‚ÄúFragrance‚Äù rather than isoeugenol). However, some individuals can develop allergies to isoeugenol as it appears to be a strong contact allergen (PMID:10554062 ). Isoeugenol can be prepared from eugenol by heating. In addition to its industrial production via eugenol, isoeugenol can also be extracted from certain essential oils especially from clove oil and cinnamon. It is found naturally in a wide number of foods, spices and plants including allspice, basil, blueberries, cinnamon, cloves, coffee, dill, ginber, nutmeg, thyme and turmeric. Isoeugenol is also a component of wood smoke and liquid smoke. It is one of several phenolic compounds responsible for the mold-inhibiting effect of smoke on meats and cheeses. Isoeugenol (specifically the acetate ester) has also been used in the production of vanillin. Isoeugenol is one of several non-cannabinoid phenols found in cannabis plants (PMID:6991645 ).
Tetrahydrobiopterin (CAS: 17528-72-2), also known as BH4, is an essential cofactor in the synthesis of neurotransmitters and nitric oxide (PMID: 16946131). In fact, it is used by all three human nitric-oxide synthases (NOS) eNOS, nNOS, and iNOS as well as the enzyme glyceryl-ether monooxygenase. It is also essential in the conversion of phenylalanine into tyrosine by the enzyme phenylalanine-4-hydroxylase; the conversion of tyrosine into L-dopa by the enzyme tyrosine hydroxylase; and the conversion of tryptophan into 5-hydroxytryptophan via tryptophan hydroxylase. Specifically, tetrahydrobiopterin is a cofactor for tryptophan 5-hydroxylase 1, tyrosine 3-monooxygenase, and phenylalanine hydroxylase, all of which are essential for the formation of the neurotransmitters dopamine, noradrenaline, and adrenaline. Tetrahydrobiopterin has been proposed to be involved in the promotion of neurotransmitter release in the brain and the regulation of human melanogenesis. A defect in BH4 production and/or a defect in the enzyme dihydropteridine reductase (DHPR) causes phenylketonuria type IV, as well as dopa-responsive dystonias. BH4 is also implicated in Parkinson's disease, Alzheimer's disease, and depression. Tetrahydrobiopterin is present in probably every cell or tissue of higher animals. On the other hand, most bacteria, fungi and plants do not synthesize tetrahydrobiopterin (Wikipedia).
Salsolinol is an endogenous catechol isoquinoline detected in humans. Salsolinol was detected in urine of parkinsonian patients administered with L-DOPA. This finding stimulated the studies on Salsolinol derivatives in the brain, and gave new aspects of the endogenous alkaloids, which had been considered to occur only in plants. In normal non-alcoholic subjects and alcoholics, Salsolinol and O-methylated Salsolinol were found in urine, cerebrospinal fluid and brains. Salsolinol has an asymmetric center at first position and exists as (R)- and (S)enantiomer. The (R)enantiomer of Salsolinol is predominant in urine from healthy volunteers. Only the (R)enantiomers of Salsolinol and N-methylated Salsolinol occur in the human brain, cerebrospinal fluid (CSF) and intraventricular fluid (IVF), and the (S)enantiomers were not detected. (R)salsolinol synthase catalyzes the enantio-selective synthesis of (R)Salsolinol and 1-carboxyl(R)Salsolinol from dopamine with acetaldehyde or pyruvic acid. The N-methylation of (R)salsolinol into N-methylsalsolinol (NMSal) is catalyzed by two N-methyltransferases with different optimum pH, at pH 7.0 and 8.4. NM(R)Salsolinol is enzymatically oxidized into 1,2-dimethyl-6,7-dihydroxyisoquinolinium ion (DMDHIQ+) by an oxidase sensitive to semicarbaside and also non-enzymatically by autoxidation. NM(R)Salsolinol and its precursor, dopamine, were found to occur selectively in the nigro-striatum, whereas (R)Salsolinol distributes uniformly among the brain regions. (PMID 14697894).
Fluorometholone is only found in individuals that have used or taken this drug. It is a glucocorticoid employed, usually as eye drops, in the treatment of allergic and inflammatory conditions of the eye. It has also been used topically in the treatment of various skin disorders. (From Martindale, The Extra Pharmacopoeia, 30th ed, p732)There is no generally accepted explanation for the mechanism of action of ocular corticosteroids. However, corticosteroids are thought to act by the induction of phospholipase A2 inhibitory proteins, collectively called lipocortins. It is postulated that these proteins control the biosynthesis of potent mediators of inflammation such as prostaglandins and leukotrienes by inhibiting the release of their common precursor, arachidonic acid. Arachidonic acid is released from membrane phospholipids by phospholipase A2. Their primary target is the cytosolic glucocorticoid receptor. After binding the receptor the newly formed receptor-ligand complex translocates itself into the cell nucleus, where it binds to many glucocorticoid response elements (GRE) in the promoter region of the target genes. The DNA bound receptor then interacts with basic transcription factors, causing the increase in expression of specific target genes.
4-O-Methyl gallic acid (4-OMGA) has first been identified as a major methyl derivative of gallic acid in human plasma and urine. More recently, 4-O-methyl gallic acid (4-OMGA) has been found in urine during regular black tea ingestion and in plasma after moderate red wine consumption. PMID: 15527792. 4-O-methylgallic acid (4-OMGA), a major metabolite of gallic acid abundant in red wine. 4-OMGA inhibited the expression of intercellular adhesion molecule-1(ICAM-1) and vascular cell adhesion molecule-1 (VCAM-1) in human umbilical vein endothelial cells (HUVECs) stimulated with tumor necrosis factor-alpha (TNF-alpha), resulting in the suppression of leukocyte adhesion to HUVECs (PMID: 17027748). 4-O-Methyl gallic acid has been found to be a metabolite of Beauveria and Pantoea (PMID: 17111140) (https://www.researchgate.net/publication/275561863_Microbial_Degradation_of_Bergenin_a_Phenolic_C-Glucoside).
Suberylglycine is an acyl glycine. Acyl glycines are normally minor metabolites of fatty acids. However, the excretion of certain acyl glycines is increased in several inborn errors of metabolism. In certain cases the measurement of these metabolites in body fluids can be used to diagnose disorders associated with mitochondrial fatty acid beta-oxidation. Acyl glycines are produced through the action of glycine N-acyltransferase (EC 2.3.1.13) which is an enzyme that catalyzes the chemical reaction: acyl-CoA + glycine < -- > CoA + N-acylglycineSuberylglycine is a dicarboxylic acid. It is formed by glycine-N-acylase catalyzed conjugation (PMID 947635). It can be used for the diagnosis of hereditary medium-chain acyl-CoA dehydrogenase deficiency (PMID 2775902). Suberylglycine is found to be associated with propionic acidemia, which is an inborn error of metabolism.
The enzyme biotinidase (EC-Number 3.5.1.12 ) is involved in the recycling of the vitamin biotin, cleaving D-biotinylamides and esters, in a reaction including biotin amide and water. (PMID 1719240, 171927). Late-onset multiple carboxylase deficiency (MCD) with biotinidase deficiency is caused by mutation in the biotinidase gene. MCD is an autosomal recessive metabolic disorder characterized primarily by cutaneous and neurologic abnormalities. Symptoms result from the patient's inability to reutilize biotin, a necessary nutrient. (OMIM 253260).
2,8-bis-Trifluoromethyl-4-quinoline carboxylic acid is a metabolite of mefloquine. Mefloquine hydrochloride (also known as Lariam or Mefaquin) is an orally administered medication used in the prevention and treatment of malaria. Mefloquine was developed in the 1970s at the United States Department of Defense's Walter Reed Army Institute of Research as a synthetic analogue of quinine. The brand name drug, Lariam, is manufactured by the Swiss company Hoffmann–La Roche. In August 2009, Roche stopped marketing Lariam in the United States. (Wikipedia)
2-Vinyl-4H-1,3-dithiine is found in onion-family vegetables. 2-Vinyl-4H-1,3-dithiine is present in garlic (Allium sativum) and caucas (Allium victorialis) but not in onion or rakky
Sertaconazole is only found in individuals that have used or taken this drug. Sertaconazole nitrate is an antifungal medication of the imidazole class. It is available as a cream to treat skin infections such as athlete's foot. [Wikipedia]Sertaconazole interacts with 14-alpha demethylase, a cytochrome P-450 enzyme necessary to convert lanosterol to ergosterol. As ergosterol is an essential component of the fungal cell membrane, inhibition of its synthesis results in increased cellular permeability causing leakage of cellular contents. Sertaconazole may also inhibit endogenous respiration, interact with membrane phospholipids, inhibit the transformation of yeasts to mycelial forms, inhibit purine uptake, and impair triglyceride and/or phospholipid biosynthesis.
4-(Dimethylamino)azobenzene is formerly used as a food dye, use discontinued.Methyl yellow, or C.I. 11020, is a chemical compound which may be used as a pH indicator. In aqueous solution at low pH, methyl yellow appears red. Between pH 2.9 and 4.0, methyl yellow undergoes a transition, to become yellow above pH 4.0. As "butter yellow" the agent had been used as a food additive before its toxicity was recognized (Opie EL). (Wikipedia
This compound belongs to the family of Peptides. These are compounds containing an amide derived from two or more amino carboxylic acid molecules (the same or different) by formation of a covalent bond from the carbonyl carbon of one to the nitrogen atom of another.
gamma-Glutamyl-S-methylcysteinyl-beta-alanine is found in pulses. gamma-Glutamyl-S-methylcysteinyl-beta-alanine is a constituent of the seeds of the mung bean (Vigna radiata).
Frovatriptan, also known as Frova (trade name), belongs to a class of medications known as 5-hydroxytryptamine agonists (triptan) (PMID: 18001261). It is widely indicated for the treatment of migraine headaches with or without aura in adults (PMID: 22900951, 27103792). It works in the brain to relieve migraine symptoms including headache, pain, nausea, vomiting, sensitivity to light/sound. However, it is not used to treat patients with hemiplegic, ophthalmoplegic or basilar migraine. Frovatriptan binds with high affinity for serotonin 5-HT1B and 5-HT1D receptors, thereby relieving pain by narrowing blood vessels (PMID: 11735616, 12517245). Patient’s may experience some side effects, especially who have heart or blood vessel disease. Frovatriptan is only found in individuals who have consumed or used this drug.
Carboxytolbutamide belongs to the family of Sulfanylbenzoic Acid Derivatives. These are benzoic acid derivatives which bear a sulfanyl group (R-SH) attached to the benzene ring.
N-Carbamoyl-2-amino-2-(4-hydroxyphenyl)acetic acid is found in pulses. N-Carbamoyl-2-amino-2-(4-hydroxyphenyl)acetic acid is isolated from leaves of Vicia fab
Extractives and their physically modified derivatives. Santalum album, Santalaceae. (SciFinder)
(7R,10Z)-alpha-Santal-10-en-12-ol is a constituent of sandalwood oil. (7R,10Z)-alpha-Santal-10-en-12-ol is a flavouring agent
beta-Santalol is found in ginger. beta-Santalol is a flavouring ingredient. beta-Santalol is a constituent  of sandalwood oil (Santalum album).
alpha-Santalene is found in allspice. alpha-Santalene is a constituent of sandalwood oil. alpha-Santalene is a flavouring ingredient
2-Ethylpyrazine, also known as fema 3281 or moldin, belongs to the class of organic compounds known as pyrazines. Pyrazines are compounds containing a pyrazine ring, which is a six-member aromatic heterocycle, that consists of two nitrogen atoms (at positions 1 and 4) and four carbon atoms. 2-Ethylpyrazine is a bitter, cocoa, and musty tasting compound. 2-Ethylpyrazine has been detected, but not quantified, in several different foods, such as asparagus, pulses, cocoa and cocoa products, cereals and cereal products, and tortilla chips.
Flunisolide is only found in individuals that have used or taken this drug. It is a corticosteroid often prescribed as treatment for allergic rhinitis.Flunisolide is a glucocorticoid receptor agonist. The antiinflammatory actions of corticosteroids are thought to involve lipocortins, phospholipase A2 inhibitory proteins which, through inhibition arachidonic acid, control the biosynthesis of prostaglandins and leukotrienes. The immune system is suppressed by corticosteroids due to a decrease in the function of the lymphatic system, a reduction in immunoglobulin and complement concentrations, the precipitation of lymphocytopenia, and interference with antigen-antibody binding. Flunisolide binds to plasma transcortin, and it becomes active when it is not bound to transcortin.
Dihydrouridine is a pyrimidine which is the result of adding two hydrogen atoms to a uridine. Dihydrouridine is found only in tRNA molecules. An inhibitor of nucleotide metabolism.
Cymorcin monoglucoside is a constituent of the seeds of Carum copticum (ajowan)
5,6-Epoxy-8,11,14-eicosatrienoic acid is an Epoxyeicosatrienoic acid (EET), a metabolite of arachidonic acid. The epoxyeicosatrienoic acids (EETs) are endogenous lipid mediators produced by P450 epoxygenases and metabolized through multiple pathways including soluble epoxide hydrolase (sEH). The cytochrome P-450 (P450) monooxygenase pathway includes enzymes of the CYP1A, CYP2B, CYP2C, CYP2E, and CYP2J subfamilies that catalyze the formation of four regioisomeric products, 5,6-, 8,9-, 11,12-, and 14,15-epoxyeicosatrienoic acid. EETs are produced in brain and perform important biological functions, including protection from ischemic injury. Both light flashes and direct glial stimulation produce vasodilatation mediated by EETs. EETs may be involved in the development of hypertension and endothelial dysfunction in DOCA-salt rats, but not in excessive collagen deposition or electrophysiological abnormalities. EETs have vasodilator and natriuretic effect. Blockade of EET formation is associated with salt-sensitive hypertension. (PMID: 17494091, 17468203, 17434916, 17406062, 17361113).
7-Hydroxyamoxapine is a metabolite of amoxapine. Amoxapine (Amokisan, Asendin, Asendis, Defanyl, Demolox, Moxadil) is a tetracyclic antidepressant of the dibenzoxazepine family, though it is often classified as a secondary amine tricyclic antidepressant. It is the N-demethylated metabolite of Loxapine. (Wikipedia)
8-Hydroxyamoxapine is a metabolite of amoxapine. Amoxapine (Amokisan, Asendin, Asendis, Defanyl, Demolox, Moxadil) is a tetracyclic antidepressant of the dibenzoxazepine family, though it is often classified as a secondary amine tricyclic antidepressant. It is the N-demethylated metabolite of Loxapine. (Wikipedia)
Avenanthramide 1p is a polyphenol compound found in foods of plant origin  (PMID: 20428313)
Hydroxylated lecithin is used as a food additive [EAFUS] ("EAFUS: Everything Added to Food in the United States. [http://www.eafus.com/]")
Di-4-coumaroylputrescine is found in fats and oils. Di-4-coumaroylputrescine is an alkaloid from Helianthus annuus (sunflower), Pyrus communis (pear), Rubus idaeus (raspberry) and Vicia faba.
2'-O-Methyladenosine is a methylated adenine residue. 2'-O-Methyladenosine is a naturally occurring 2'-O-methylpurine nucleoside with long lasting hypotensive properties; resistance of 2'-O-methyladenosine against adenosine deaminase is thought to contribute to prolonged activity. 2'-O-Methyladenosine occurs in human fluids, and they increase in urines of untreated adenosine deaminase (ADA) deficient patients (OMIM 608958). (PMID: 9539952, 6980397).
2,6-di-tert-butylbenzoquinone is not used for fragrances or flavors.
Lanthionine ketimine binds specifically and with high affinity to brain membranes and belong to a class of endogenous sulfur-containing cyclic products provided with a possible neurochemical function (PMID 1761027).
Thioguanosine 5'-diphosphate is a metabolite of azathioprine. Azathioprine is a purine analogue immunosuppressive drug. It is used to prevent rejection following organ transplantation, and to treat a vast array of autoimmune diseases, including rheumatoid arthritis, pemphigus, inflammatory bowel disease, multiple sclerosis, autoimmune hepatitis, atopic dermatitis, myasthenia gravis, neuromyelitis optica or Devic's disease, restrictive lung disease, and others (Wikipedia).
Ketoprofen is only found in individuals that have used or taken this drug. It is a propionic acid derivative and is a nonsteroidal anti-inflammatory agent (NSAIA) with analgesic and antipyretic properties. The anti-inflammatory effects of ketoprofen are believed to be due to inhibition cylooxygenase-2 (COX-2), an enzyme involved in prostaglandin synthesis via the arachidonic acid pathway. This results in decreased levels of prostaglandins that mediate pain, fever and inflammation. Ketoprofen is a non-specific cyclooxygenase inhibitor and inhibition of COX-1 is thought to confer some of its side effects, such as GI upset and ulceration. Ketoprofen is thought to have anti-bradykinin activity, as well as lysosomal membrane-stabilizing action. Antipyretic effects may be due to action on the hypothalamus, resulting in an increased peripheral blood flow, vasodilation, and subsequent heat dissipation.
Sulfolithocholylglycine is an acyl glycine and a bile acid-glycine conjugate. It is a secondary bile acid produced by the action of enzymes existing in the microbial flora of the colonic environment. In hepatocytes, both primary and secondary bile acids undergo amino acid conjugation at the C-24 carboxylic acid on the side chain, and almost all bile acids in the bile duct, therefore, exist in a glycine conjugated form (PMID: 16949895). Sulfolithocholylglycine is a sulfated bile acid which has a greater renal clearance rate than lithocholylglycine.
gamma-Glutamylphenylalanine is a dipeptide composed of gamma-glutamate and phenylalanine, and is a proteolytic breakdown product of larger proteins. It is probably formed by transpeptidation between glutathione and the corresponding amino acid, catalyzed by gamma-glutamyl transpeptidase (PMID: 237763). gamma-Glutamylphenylalanine belongs to the family of N-acyl-alpha amino acids and derivatives. These are compounds containing an alpha amino acid which bears an acyl group at its terminal nitrogen atom. gamma-Glutamylphenylalanine is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis. It can be detected in the urine of patients with phenylketonuria, which is a human genetic disorder due to the lack of phenylalanine hydroxylase to metabolize phenylalanine to tyrosine (Wikipedia). gamma-Glutamylphenylalanine is found in adzuki bean, onion (Allium cepa), garlic (Allium sativum), and soybean.
Rhoeagenine is an alkaloid from Papaver rhoeas (corn poppy
Benzthiazide is used to treat hypertension and edema. Like other thiazides, benzthiazide promotes water loss from the body (diuretics). They inhibit Na+/Cl- reabsorption from the distal convoluted tubules in the kidneys. Thiazides also cause loss of potassium and an increase in serum uric acid. Thiazides are often used to treat hypertension, but their hypotensive effects are not necessarily due to their diuretic activity. Thiazides have been shown to prevent hypertension-related morbidity and mortality although the mechanism is not fully understood. Thiazides cause vasodilation by activating calcium-activated potassium channels (large conductance) in vascular smooth muscles and inhibiting various carbonic anhydrases in vascular tissue.
Tetraethylene glycol, also known as 2,2’-[oxybis(2,1-ethanediyloxy)]bisethanol or 3,6,9-trioxaundecan-1,11-diol, is classified as a member of the polyethylene glycols. It is an industrial solvent/chemical with a higher boiling point and lower volatility than the lower ethylene glycols. It is especially useful in polyester resins and as a plasticizer. Tetraethylene glycol is also used as a chemical intermediate and as a solvent in the production of inks and dyes. It is often used as a process solvent in hydrocarbon purification processes and as a coupling agent in the production of textile lubricants and formulations. Tetraethylene glycol is a non-carcinogenic (not listed by IARC) potentially toxic compound. (ChemoSummarizer)
Cyclopassifloside I is found in fruits. Cyclopassifloside I is a constituent of Passiflora edulis (passion fruit)
4'-Hydroxyflurbiprofen is a metabolite of flurbiprofen. Flurbiprofen is a member of the phenylalkanoic acid derivative family of non-steroidal anti-inflammatory drugs (NSAIDs) used to treat the inflammation and pain of arthritis. It is known by the following tradenames: Urbifen marketed by General Pharmaceuticals, Ansaid, marketed by Pfizer, Flurwood by W. Woodward and Froben, by Abbott. Flurbiprofen is also used as an active ingredient in some kinds of throat lozenges. (Wikipedia)
2,4-Hexadienyl acetate is used as a food additive [EAFUS] ("EAFUS: Everything Added to Food in the United States. [http://www.eafus.com/]")
6-Thioinosine-5'-monophosphate is a metabolite of mercaptopurine. Mercaptopurine (also called 6-mercaptopurine, 6-MP or its brand name Purinethol) is an immunosuppressive drug. It is a thiopurine. (Wikipedia)
Pindolol is only found in individuals that have used or taken this drug. It is a moderately lipophilic beta blocker (adrenergic beta-antagonists). It is non-cardioselective and has intrinsic sympathomimetic actions, but little membrane-stabilizing activity. (From Martindale, The Extra Pharmocopoeia, 30th ed, p638)Pindolol non-selectively blocks beta-1 adrenergic receptors mainly in the heart, inhibiting the effects of epinephrine and norepinephrine resulting in a decrease in heart rate and blood pressure. By binding beta-2 receptors in the juxtaglomerular apparatus, Pindolol inhibits the production of renin, thereby inhibiting angiotensin II and aldosterone production and therefore inhibits the vasoconstriction and water retention due to angiotensin II and aldosterone, respectively.
Baclofen is a gamma-amino-butyric acid (GABA) derivative used as a skeletal muscle relaxant. Baclofen stimulates GABA-B receptors leading to decreased frequency and amplitude of muscle spasms. It is especially useful in treating muscle spasticity associated with spinal cord injury. It appears to act primarily at the spinal cord level by inhibiting spinal polysynaptic afferent pathways and, to a lesser extent, monosynaptic afferent pathways.
Allylamine, also known as 3-aminopropylene or prop-2-en-1-amine, is classified as a monoalkylamine. Monoalkylamines are organic compounds containing an primary aliphatic amine group. Allylamine is soluble (in water) and a very strong basic compound (based on its pKa). Allylamine is a colorless liquid and is the simplest stable unsaturated amine. Allylamine is used to make pharmaceuticals and other chemicals. Allylamine, like other allyl derivatives is a lachrymator and skin irritant.
Fucose (CAS: 2438-80-4) is a hexose deoxy sugar with the chemical formula C6H12O5. L-Fucose (6-deoxy-L-galactose) is a monosaccharide that is a common component of many N- and O-linked glycans and glycolipids produced by mammalian cells. It is the fundamental subunit of the fucoidan polysaccharide. As a free sugar, L-fucose is normally found at very low levels in mammals. It is unique in that it is the only levorotatory sugar synthesized and utilized by mammals. Fucose polymers are synthesized by fucosyltransferases. All fucosyltransferases utilize a nucleotide-activated form of fucose, GDP-fucose, as a fucose donor in the construction of fucosylated oligosaccharides. The ABO blood group antigens are among the most well known fucosylated glycans. The alpha-1->3 linked core fucose is a suspected carbohydrate antigen for IgE-mediated allergy. Two structural features distinguish fucose from other six-carbon sugars present in mammals: the lack of a hydroxyl group on the carbon at the 6-position (C-6) and the L-configuration. In fucose-containing glycan structures, fucosylated glycans, fucose can exist as a terminal modification or serve as an attachment point for adding other sugars. Fucose is metabolized by an enzyme called alpha-fucosidase. Fucose is secreted in urine when the liver is damaged. Free L-fucose in serum and urine can be used as a marker for cancer, cirrhosis, alcoholic liver disease and gastric ulcers (PMID: 2311216, 8488966). Elevated levels of serum fucose have been reported in breast cancer, ovarian cancer, lung cancer, liver cancer, diabetes, and cardiovascular disease. It has been shown that feeding rats a diet high in L-fucose induces neuropathy similar to that seen in diabetics.
2,4-Diaminobutyric acid, also known as 2,4-diaminobutanoate or Dbu, belongs to the class of organic compounds known as alpha amino acids. These are amino acids in which the amino group is attached to the carbon atom immediately adjacent to the carboxylate group (alpha carbon). 2,4-Diaminobutyric acid is a very hydrophobic molecule, practically insoluble in water, and relatively neutral. 2,4-Diaminobutyric acid exists in all living organisms, ranging from bacteria to humans. Outside of the human body, 2,4-Diaminobutyric acid has been detected, but not quantified in cow milk. This could make 2,4-diaminobutyric acid a potential biomarker for the consumption of these foods. 2,4-Diaminobutyric acid is a non-physiological, cationic amino acid analogue that is transported into cells by System A with potent antitumoral activity in vitro against human glioma cells, the result of the pronounced concentrated uptake of DAB in glioma cells to the extent that a cellular lysis could occur due to osmotic reasons.
(R)-2-Hydroxysterculic acid is found in nuts. (R)-2-Hydroxysterculic acid is a constituent of seed oils of Pachira aquatica (Malabar chestnut)
Tocainide is only found in individuals that have used or taken this drug. It is an antiarrhythmic agent which exerts a potential- and frequency-dependent block of sodium channels. [PubChem]Tocainide acts on sodium channels on the neuronal cell membrane, limiting the spread of seizure activity and reducing seizure propagation. Tocainide binds preferentially to the inactive state of the sodium channels.The antiarrhythmic actions are mediated through effects on sodium channels in Purkinje fibers.
Alkaloid AQC2 is an alkaloid AQC2 is an alkaloid from cell cultures of Aspidosperma quebracho-blanco (quebracho)
Dihydrothymine (CAS: 696-04-8) is an intermediate breakdown product of thymine. Dihydropyrimidine dehydrogenase catalyzes the reduction of thymine into 5,6-dihydrothymine; then dihydropyrimidinase hydrolyzes 5,6-dihydrothymine into N-carbamyl-beta-alanine. Finally, beta-ureidopropionase catalyzes the conversion of N-carbamyl-beta-alanine into beta-alanine. When present at abnormally high levels, dihydrothymine can be toxic, although the mechanism of toxicity is not clear. In particular, patients with dihydropyrimidinase deficiency exhibit highly increased concentrations of 5,6-dihydrouracil and 5,6-dihydrothymine; and moderately increased concentrations of uracil and thymine can be detected in urine. Dihydropyrimidinase deficiency is a disorder that can cause neurological and gastrointestinal problems in some affected individuals. The most common neurological abnormalities that occur are intellectual disability, seizures, weak muscle tone (hypotonia), abnormally small head size (microcephaly), and autistic behaviours that affect communication and social interaction. Gastrointestinal problems that occur in dihydropyrimidinase deficiency include the backflow of acidic stomach contents into the esophagus (gastroesophageal reflux) and recurrent episodes of vomiting.
The main function of coenzyme A is to carry acyl groups (such as the acetyl group) or thioesters. Acetyl-CoA is an important molecule itself. It is the precursor to HMG CoA, which is a vital component in cholesterol and ketone synthesis. (wikipedia). acetyl CoA participates in the biosynthesis of fatty acids and sterols, in the oxidation of fatty acids and in the metabolism of many amino acids. It also acts as a biological acetylating agent.
2-aminomuconic semialdehyde is an intermediate in the oxidative metabolism of tryptophan in mammals, and takes place via the kynurenine pathway, which is also used for NAD biosynthesis in all eukaryotic organisms. 2-Aminomuconic semialdehyde is reported to be unstable and spontaneously converted to picolinic acid (regarded as metabolically inert and is excreted in the urine as a glycine conjugate), and enzymatically converted to 2-aminomuconic acid through the action of 2-aminomuconic semialdehyde dehydrogenase. (PMID: 10510494, 16267312, 14275129).
4-Imidazolone-5-propanoate is a metabolite of histidine metabolism. It is produced from urocanic acid by the enzyme urocanate hydratase [EC:4.2.1.49]. 4-Imidazolone-5-propionic acid can spontaneously decay to 4-oxoglutaramate or formylisoglutamine. It is also converted to N-forminimo-L-glutamate by the enzyme imidazolonepropionase [EC:3.5.2.7].
MG(0:0/18:1(9Z)/0:0) is a monoacylglyceride. A monoglyceride, more correctly known as a monoacylglycerol, is a glyceride consisting of one fatty acid chain covalently bonded to a glycerol molecule through an ester linkage. Monoacylglycerol can be broadly divided into two groups; 1-monoacylglycerols (or 3-monoacylglycerols) and 2-monoacylglycerols, depending on the position of the ester bond on the glycerol moiety. Normally the 1-/3-isomers are not distinguished from each other and are termed 'alpha-monoacylglycerols', while the 2-isomers are beta-monoacylglycerols. Monoacylglycerols are formed biochemically via release of a fatty acid from diacylglycerol by diacylglycerol lipase or hormone sensitive lipase. Monoacylglycerols are broken down by monoacylglycerol lipase. They tend to be minor components only of most plant and animal tissues, and indeed would not be expected to accumulate because their strong detergent properties would have a disruptive effect on membranes. 2-Monoacylglycerols are a major end product of the intestinal digestion of dietary fats in animals via the enzyme pancreatic lipase. They are taken up directly by the intestinal cells and converted to triacylglycerols via the monoacylglycerol pathway before being transported in lymph to the liver. Mono- and Diglycerides are commonly added to commercial food products in small quantities. They act as emulsifiers, helping to mix ingredients such as oil and water that would not otherwise blend well.
Butyrylcarnitine, also known as (3R)-3-(butyryloxy)-4-(trimethylammonio)butanoate or L-carnitine butyryl ester, is classified as a member of the acylcarnitines. Acylcarnitines are organic compounds containing a fatty acid with the carboxylic acid attached to carnitine through an ester bond. Butyrylcarnitine is considered to be practically insoluble (in water) and acidic. Butyrylcarnitine is elevated in patients with short-chain acyl-CoA dehydrogenase (SCAD) deficiency, in infants with acute acidosis and generalized muscle weakness, and in middle-aged patients with chronic myopathy localized in muscle (OMIM: 201470).
Elaidic carnitine is an acylcarnitine. Numerous disorders have been described that lead to disturbances in energy production and in intermediary metabolism in the organism which are characterized by the production and excretion of unusual acylcarnitines. A mutation in the gene coding for carnitine-acylcarnitine translocase or the OCTN2 transporter aetiologically causes a carnitine deficiency that results in poor intestinal absorption of dietary L-carnitine, its impaired reabsorption by the kidney and, consequently, in increased urinary loss of L-carnitine. Determination of the qualitative pattern of acylcarnitines can be of diagnostic and therapeutic importance. The betaine structure of carnitine requires special analytical procedures for recording. The ionic nature of L-carnitine causes a high water solubility which decreases with increasing chain length of the ester group in the acylcarnitines. Therefore, the distribution of L-carnitine and acylcarnitines in various organs is defined by their function and their physico-chemical properties as well. High performance liquid chromatography (HPLC) permits screening for free and total carnitine, as well as complete quantitative acylcarnitine determination, including the long-chain acylcarnitine profile. (PMID: 17508264, Monatshefte fuer Chemie (2005), 136(8), 1279-1291., Int J Mass Spectrom. 1999;188:39-52.).
2-Heptanone, also known as butylacetone or heptan-2-one, belongs to the class of organic compounds known as ketones. These are organic compounds in which a carbonyl group is bonded to two carbon atoms R2C=O (neither R may be a hydrogen atom). Ketones that have one or more alpha-hydrogen atoms undergo keto-enol tautomerization, the tautomer being an enol. Thus, 2-heptanone is considered to be an oxygenated hydrocarbon lipid molecule. 2-Heptanone is a ketone with the molecular formula C7H14O. 2-Heptanone is a very hydrophobic molecule, practically insoluble in water, and relatively neutral. 2-Heptanone exists in all living species, ranging from bacteria to humans. 2-Heptanone is a sweet, cinnamon, and coconut tasting compound. 2-Heptanone is found, on average, in the highest concentration within a few different foods, such as corns, cow milk, and peppermints. 2-Heptanone has also been detected, but not quantified in several different foods, such as tarragons, blackberries, tortilla chips, ceylon cinnamons, and evergreen blackberries. 2-Heptanone is one of the metabolites of n-heptane found in the urine of employees exposed to heptane in shoe and tire factories. 2-Heptanone, with regard to humans, has been found to be associated with several diseases such as ulcerative colitis, nonalcoholic fatty liver disease, crohn's disease, and hepatic encephalopathy; 2-heptanone has also been linked to the inborn metabolic disorder celiac disease. It is a colorless to white liquid with a banana-like, fruity odor.
Glucuronic acid (CAS: 6556-12-3) is a carboxylic acid that has the structure of a glucose molecule that has had its sixth carbon atom (of six total) oxidized. The salts of glucuronic acid are known as glucuronates. Glucuronic acid is highly soluble in water. In humans, glucuronic acid is often linked to toxic or poisonous substances to allow for subsequent elimination, and to hormones to allow for easier transport. These linkages involve O-glycosidic bonds. The process is known as glucuronidation, and the resulting substances are known as glucuronides (or glucuronosides). Glucuronidation uses UDP-glucuronic acid (glucuronic acid linked via a glycosidic bond to uridine diphosphate) as an intermediate. UDP-glucuronic acid is formed in the liver of all animals.
3-Heptanone is found in spearmint. 3-Heptanone is a flavouring ingredien
5Z-Dodecenoic acid, also known as 5-dodecenoic acid or 5-dodecenoate, is a monounsaturated fatty acid that has a C12 chain as a backbone and a cis double bond at the C5 position. 5-Dodecenoic acid is a member of the class of compounds known as medium-chain fatty acids. Medium-chain fatty acids are fatty acids with an aliphatic tail that contains between 4 and 12 carbon atoms. Thus, 5-dodecenoic acid is considered to be a fatty acid lipid molecule. 5-Dodecenoic acid is practically insoluble (in water) and a weakly acidic compound (based on its pKa). Within the cell, 5-dodecenoic acid is primarily located in the cytoplasm and in the membrane (predicted from logP). It can also be found in the extracellular space. An increase of 5-dodecenoic acid in plasma is associated with acyl-CoA dehydrogenase deficiency disorders (PMID: 7586519). 5-Dodecenoic acid is an intermediate of unsaturated fatty acid oxidation.
Methyl Arachidonate, also known as Arachidonate methyl ester or (5Z,8Z,11Z,14Z)-Icosatetraenoate methyl ester, is classified as a member of the Fatty acid methyl esters. Fatty acid methyl esters are compounds containing a fatty acid that is esterified with a methyl group. They have the general structure RC(=O)OR', where R=fatty aliphatic tail or organyl group and R'=methyl group. Methyl Arachidonate is considered to be practically insoluble (in water) and basic.  Methyl Arachidonate can be synthesized from arachidonic acid. Methyl Arachidonate can be synthesized into 12(R)-HPETE methyl ester and 12(S)-HPETE methyl ester
Cholesteryl acetate is a normal human cholesteryl ester present in diverse fluids and organs. Cholesteryl acetate is also present in foods. Food oxidation affects the quality and safety of the human diet by generating compounds with biological activities that can adversely affect health. In particular the susceptibility of cholesterol to oxidation is well known; certain products of cholesterol oxidation have been reported to produce cytotoxic, angiotoxic and carcinogenic effects. Cholesteryl ester (CE) is the major transport and storage form of cholesterol in lipoprotein particles and most cell types. Molecular composition of CE species is of high interest for arteriosclerosis research, i.e., as components of lipoprotein subclasses or in studies investigating the mechanisms involved in the generation of lipid laden foam cells. Thus, it has been shown that CE species in circulating plasma are strongly correlated with development of coronary heart disease. This may be related to specific CE species profiles generated by enzymes involved in lipoprotein metabolism like lecithin:cholesterol acyltransferase (EC 2.3.1.43, LCAT), acyl-coenzyme A:cholesterol acyltransferase 2 (EC 2.3.1.26, ACAT2) or cholesteryl ester transfer protein (CETP). The cholesteryl ester transfer protein has a key role in the metabolism of high-density lipoprotein (HDL), mediating the exchange of lipids between lipoproteins, resulting in the net transfer of cholesteryl ester from HDL to other lipoproteins and in the subsequent uptake of cholesterol by hepatocytes. By increasing the cholesteryl ester content of low-density and very-low-density lipoproteins, CETP promotes the atherogenicity of these lipoproteins. In addition, high plasma concentrations of CETP are associated with reduced concentrations of HDL cholesterol. (PMID: 10918380, 16458590, 9420339, 3343104, 6721900, 7278520).
Glucuronic acid (CAS: 6556-12-3) is a carboxylic acid that has the structure of a glucose molecule that has had its sixth carbon atom (of six total) oxidized. The salts of glucuronic acid are known as glucuronates. Glucuronic acid is highly soluble in water. In humans, glucuronic acid is often linked to toxic or poisonous substances to allow for subsequent elimination, and to hormones to allow for easier transport. These linkages involve O-glycosidic bonds. The process is known as glucuronidation, and the resulting substances are known as glucuronides (or glucuronosides). Glucuronidation uses UDP-glucuronic acid (glucuronic acid linked via a glycosidic bond to uridine diphosphate) as an intermediate. UDP-glucuronic acid is formed in the liver of all animals.
Monoethylhexyl phthalic acid (MEHP) is an active metabolite of Bis(2-ethylhexyl)phthalate (DEHP). DEHP measured from the blood of pregnant women have been significantly associated with the decreased penis width, shorter anogenital distance, and the incomplete descent of testes of their newborn sons, replicating effects identified in animals(Wikipedia). DEHP hydrolyzes to MEHP via the enzyme Bis(2-ethylhexyl)phthalate acylhydrolase(3.1.1.60)and subsequently to phthalate salts. The released alcohol is susceptible to oxidation to the aldehyde and carboxylic acid.
Fructose 6-phosphate (F6P) belongs to the class of organic compounds known as hexose phosphates. These are carbohydrate derivatives containing a hexose substituted by one or more phosphate groups. F6P is a derivative of fructose, which has been phosphorylated at the 6-hydroxy group. Fructose 6-phosphate is a fundamental metabolite and exists in all living species, ranging from bacteria to plants to humans. The great majority of glucose is converted to fructose 6-phosphate as part of the glycolytic metabolic pathway (glycolysis). Specifically, F6P is produce is produced by the isomerisation of glucose 6-phosphate via the enzyme phosphoglucose isomerase. F6P is in turn further phosphorylated to fructose-1,6-bisphosphate by the enzyme phosphofructokinase-1. Glycolysis is the metabolic pathway that converts glucose into pyruvic acid. The free energy released in this process is used to form ATP and reduced nicotinamide adenine dinucleotide (NADH). In addition to its key involvement in glycolysis, fructose 6-phosphate can also be biosynthesized from glucosamine 6-phosphate via the enzyme glucosamine-6-phosphate isomerase 1. In addition, fructose 6-phosphate and L-glutamine can be converted into glucosamine 6-phosphate and L-glutamic acid through the action of the enzyme glutamine--fructose-6-phosphate aminotransferase.
3-(3-Hydroxyphenyl)propanoic (hMPP) acid is one of the major metabolites of ingested caffeic acid (PMID: 15479001) and of the phenolic degradation products of proanthocyanidins (the most abundant polyphenol present in chocolate) by the microflora in the colon (PMID: 12663291). mHPP is suspected to have antioxidants properties and is actively absorbed by the monocarboxylic acid transporter (MCT) in intestinal Caco-2 cell monolayers (PMID: 15479001, 12663291). hMPP has been found to be a metabolite of Clostridium, Escherichia, and Eubacterium (PMID: 28393285, 19520845). 3-(3-Hydroxyphenyl)propanoic acid is a flavonoid metabolite. 3-(3-Hydroxyphenyl)propanoic acid is a phenolic acid metabolite formed by the gut microflora detected after the consumption of whole grain.
4-O-beta-D-Xylopyranosyl-L-arabinose is found in fruits. 4-O-beta-D-Xylopyranosyl-L-arabinose is isolated from acid hydrolysate of peach gum.
Citramalic acid, also known as 2-Methylmalic acid, is an analog of malic acid. The structure of citramalic acid is similar to the structure of malic acid except it has an extra CH3 group on position 2. It is also classified as a 2-hydroxydicarboxylic acid. Citramalic acid exists in two isomers, L-citramalic acid and D-citramalic acid.  The L-isomer is more biologically relevant isomer. Citramalic acid is found in almost all living organisms from microbes to plants to humans although citramalate is primarily produced from bacteria. L-citramalic acid was first isolated from the peel of apples in 1954 (PMID: 13160011). It has also been isolated in wine and other ripening fruit (PMID: 13807713). Citramalic acid can inhibit the production of malic acid. Citramalic acid is also an important microbial metabolite and has been found to be a byproduct of Saccharomyces yeast species, as well as Propionibacterium acnes and Aspergillus niger (PMID: 31827810) (http://drweyrich.weyrich.com/labs/oat.html) (PMID: 7628083). Citramalic acid is a component of the C5-branched dibasic acid metabolism pathway. It can be broken down by the enzyme citramalate lyase, which converts citramalate to acetate and pyruvate. Citramalate synthase is an enzyme found in bacteria that synthesizes citramalic acid from acetyl-CoA, pyruvate and water. Citramalic acid may have a useful role in medical diagnoses. It has been found in the urine of two brothers with autistic features (PMID: 7628083). Citramalic acid can also be used as a urinary marker for gut dysbiosis (PMID: 31669633). Dysbiosis is a disorder of the bacterial flora of the human digestive tract. It is usually diagnosed clinically by direct detection of an abnormal pattern of the intestinal microbiota.
Palmityl-CoA is a fatty acid coenzyme derivative which plays a key role in fatty acid oxidation and biosynthesis.
Oleoyl-CoA is a substrate for Acyl-CoA desaturase and Protein FAM34A.
Linoleoyl-CoA is the acyl-CoA of linoleic acid found in the human body. It binds to and results in decreased activity of glutathione S-transferase1. It has been proposed that inhibition of mitochondrial adenine nucleotide translocator by long-chain acyl-CoA underlies the mechanism associating obesity and type 2 diabetes. Unsaturated fatty acids play an important role in the prevention of human diseases such as diabetes, obesity, cancer, and neurodegeneration. Their oxidation in vivo by acyl-CoA dehydrogenases (ACADs) catalyze the first step of each cycle of mitochondrial fatty acid beta-oxidation. ACAD-9 had maximal activity with long-chain unsaturated acyl-CoAs as substrates (PMID: 17184976, 16020546).
3b,5a,6b-Cholestanetriol is a product of cholesterol oxidation found in human plasma.
(±)-erythro-Isoleucine is a flavouring ingredient, dietary supplement, and a nutrient. Branched-chain amino acids (BCAA) are essential amino acids whose carbon structure is marked by a branch point. These three amino acids are critical to human life and are particularly involved in stress, energy and muscle metabolism. BCAA supplementation as therapy, both oral and intravenous, in human health and disease holds great promise. BCAA denotes valine, isoleucine, and leucine which are branched chain essential amino acids. Despite their structural similarities, the branched amino acids have different metabolic routes, with valine going solely to carbohydrates, leucine solely to fats, and isoleucine to both. The different metabolism accounts for different requirements for these essential amino acids in humans: 12 mg/kg, 14 mg/kg, and 16 mg/kg of valine, leucine, and isoleucine respectively. Furthermore, these amino acids have different deficiency symptoms. Valine deficiency is marked by neurological defects in the brain, while isoleucine deficiency is marked by muscle tremors. BCAA are decreased in patients with liver disease such as hepatitis, hepatic coma, cirrhosis, extrahepatic biliary atresia, or portacaval shunt. Aromatic amino acids (AAA)-tyrosine, tryptophan, and phenylalanine (as well as methionine) are increased in these conditions. Valine, in particular, has been established as a useful supplemental therapy to the ailing liver. All the BCAA probably compete with AAA for absorption into the brain. Supplemental BCAA with vitamin B6 and zinc help normalize the BCAA:AAA ratio. The BCAA are not without side effects. Leucine alone, for example, exacerbates pellagra and can cause psychosis in pellagra patients by increasing excretion of niacin in the urine. Leucine may lower brain serotonin and dopamine. The ratio of leucine to other BCAA is greatest in pork, where leucine is 7 to 8 g and the other BCAA together are only 3 to 4 g (http://www.dcnutrition.com).
D-Glutamine, also known as DGN or D glutamine, belongs to the class of organic compounds known as d-alpha-amino acids. These are alpha amino acids which have the D-configuration of the alpha-carbon atom. Supplementation does not appear to be useful in adults or children with Crohn's disease or inflammatory bowel disease, but clinical studies as of 2016 were underpowered. D-Glutamine is a drug. D-Glutamine exists in all living species, ranging from bacteria to humans. D-Glutamine is a potentially toxic compound. Adverse effects of glutamine have been described for people receiving home parenteral nutrition and those with liver-function abnormalities. Glutamine is the most abundant naturally occurring, nonessential amino acid in the human body, and one of the few amino acids that can directly cross the blood-brain barrier. Glutamine can exist in either of two enantiomeric forms, L-glutamine and D-glutamine.
Glyceraldehyde 3-phosphate (G3P) (CAS: 591-59-3), also known as triose phosphate, belongs to the class of organic compounds known as glyceraldehyde-3-phosphates. Glyceraldehyde-3-phosphates are compounds containing a glyceraldehyde substituted at position O3 by a phosphate group. Glyceraldehyde 3-phosphate is an extremely weak basic (essentially neutral) compound (based on its pKa). Glyceraldehyde 3-phosphate has been detected, but not quantified in, several different foods, such as sea-buckthorn berries, lingonberries, prunus (cherry, plum), quinoa, and sparkleberries. This could make glyceraldehyde 3-phosphate a potential biomarker for the consumption of these foods. Glyceraldehyde 3-phosphate is an aldotriose, an important metabolic intermediate in both glycolysis and gluconeogenesis, and in tryptophan biosynthesis. G3P is formed from fructose 1,6-bisphosphate, dihydroxyacetone phosphate (DHAP), and 1,3-bisphosphoglycerate (1,3BPG). This is the process by which glycerol (as DHAP) enters the glycolytic and gluconeogenesis pathways.
1,3-Dimethyluric acid is a product of theophylline metabolism in man. 1,3-Dimethyluric acid is one of the purine components in urinary calculi. Methylated purines originate from the metabolism of methylxanthines (caffeine, theophylline and theobromine). Methyluric acids are indistinguishable from uric acid by simple methods routinely used in clinical laboratories, requiring the use of high-performance liquid chromatography (HPLC). Purine derivatives in urinary calculi could be considered markers of abnormal purine metabolism. The content of a purine derivative in stone depends on its average urinary excretion in the general population, similarity to the chemical structure of uric acid, and content of the latter in stone. This suggests that purines in stones represent a solid solution with uric acid as solvent. It is also plausible that methylxanthines, ubiquitous components of the diet and drugs, are involved in the pathogenesis of urolithiasis. Caffeine is metabolized via successive pathways mainly catalyzed by CYP1A2, xanthine oxidase or N-acetyltransferase-2 to give 14 different metabolites. CYP1A2 activity shows an inter-individual variability among the population. CYP1A2, an isoform of the CYP1A cytochrome P450 super-family, is involved in the metabolism of many drugs and plays a potentially important role in the induction of chemical carcinogenesis. (PMID:11712316, 15833286, 3506820, 15013152, 4039734).
N-Acetyl-1-methylhistidine belongs to the class of organic compounds known as histidine and derivatives. Histidine and derivatives are compounds containing histidine or a derivative thereof resulting from a reaction of histidine at the amino group or the carboxy group, or from the replacement of any hydrogen of glycine by a heteroatom. N-Acetyl-1-methylhistidine is an acetylated derivative of 1-methylhistidine and a very strong basic compound (based on its pKa). It has been found to be associated with chronic kidney disease: the higher the N-acetyl-1-methylhistidine levels, the lower the estimated glomerular filtration rate. This could make N-acetyl-1-methylhistidine a biomarker for chronic kidney disease (PMID: 24625756).
beta-N-Acetylglucosamine is an acylaminosugar, which is an organic compound containing a sugar linked to a chain through an N-acyl group.  This compound is water-soluble.  Glycosylation with beta-N-acetylglucosamine is one of the most common post-translational modifications.  All animals and plants dynamically attach and remove beta-N-acetylglucosamine at serine and threonine residues on myriad nuclear and cytoplasmic proteins.  beta-N-Acetylglucosamine cycling, which is tightly regulated by the concerted actions of two highly-conserved enzymes, serves as a nutrient and stress sensor.  Proteins glycosylated with beta-N-acetylglucosamine can be found in almost every intracellular compartment and almost every functional class (PMID: 17460662).
Octadecadienoate is also known as Octadecadienoic acid.  Octadecadienoate is considered to be practically insoluble (in water) and acidic.  Octadecadienoate is a fatty acid lipid molecule
Ribothymidine is an endogenous methylated nucleoside found in human fluids; methylated purine bases are present in higher amounts in tumor-bearing patients compared to healthy controls.DNA hypermethylation is a common finding in malignant cells and has been explored as a therapeutic target for hypomethylating agents. When chemical bonds to DNA, the DNA becomes damaged and proper and complete replication cannot occur to make the normal intended cell. A DNA adduct is an abnormal piece of DNA covalently-bonded to a cancer-causing chemical. This has shown to be the start of a cancerous cell, or carcinogenesis. DNA adducts in scientific experiments are used as bio-markers and as such are themselves measured to reflect quantitatively, for comparison, the amount of cancer in the subject. (PMID:3506820, 17044778, 17264127, 16799933).
Ribitol is a pentose alcohol formed by the reduction of ribose. It occurs naturally in plants as well as in the cell walls of some Gram-positive bacteria. Ribitol forms part of the chemical structure of riboflavin and flavin mononucleotide (FMN). It is also a metabolic end product formed by the reduction of ribose in human fibroblasts and erythrocytes. In this regard ribitol is found in all organisms from bacteria to plants to humans. Ribitol is a normal constituent of human urine (PMID: 2736321). Elevated levels of ribitol in the serum or urine can be found in patients with transaldolase deficiency (PMID: 11283793). Transaldolase is an important enzyme in the pentose phosphate pathway (PPP).  Elevated levels of ribitol in the serum or urine can be found in patients with Ribose-5-phosphate isomerase deficiency (PMID: 14988808).  Ribose-5-phosphate isomerase is an important enzyme in the pentose phosphate pathway (PPP). Export of ribitol across the cell membrane indicates that can be cleared from the body without metabolic conversion (PMID 15234337). Ribitol is normally absent in Breast milk (PMID 16456418).
1-Octene is used as a food additive [EAFUS] ("EAFUS: Everything Added to Food in the United States. [http://www.eafus.com/]")
Gabapentin was originally developed as a chemical analogue of gamma-aminobutyric acid (GABA) to reduce the spinal reflex for the treatment of spasticity and was found to have anticonvulsant activity in various seizure models. In addition, it also displays antinociceptive activity in various animal pain models. Clinically, gabapentin is indicated as an add-on medication for the treatment of partial seizures, and neuropathic pain. It was also claimed to be beneficial in several other clinical disorders such as anxiety, bipolar disorder, and hot flashes. The possible mechanisms or targets involved in the multiple therapeutic actions of gabapentin have been actively studied. Since gabapentin was developed, several hypotheses had been proposed for its action mechanisms. They include selectively activating the heterodimeric GABA(B) receptors consisting of GABA(B1a) and GABA(B2) subunits, selectively enhancing the NMDA current at GABAergic interneurons, or blocking AMPA-receptor-mediated transmission in the spinal cord, binding to the L-alpha-amino acid transporter, activating ATP-sensitive K(+) channels, activating hyperpolarization-activated cation channels, and modulating Ca(2+) current by selectively binding to the specific binding site of [(3)H]gabapentin, the alpha(2)delta subunit of voltage-dependent Ca(2+) channels. Different mechanisms might be involved in different therapeutic actions of gabapentin. In this review, we summarized the recent progress in the findings proposed for the antinociceptive action mechanisms of gabapentin and suggest that the alpha(2)delta subunit of spinal N-type Ca(2+) channels is very likely the analgesic action target of gabapentin. (PMID: 16474201).
Eicosadienoic acid is an omega-6 fatty acid found in human milk (PMID: 15256803). Omega-6 fatty acids are a family of unsaturated fatty acids which have in common a carbon-carbon double bond in the n−6 position; that is, the sixth bond from the end of the fatty acid. The biological effects of the omega−6 fatty acids are largely mediated by their conversion to n-6 eicosanoids that bind to diverse receptors found in every tissue of the body. Eicosadienoic acid has been identified in the human placenta (PMID: 32033212).
11Z-Eicosenoic acid, also known as gondoic acid, is a member of the class of compounds known as long-chain fatty acids. Long-chain fatty acids are fatty acids with an aliphatic tail that contains between 13 and 21 carbon atoms. 11Z-Eicosenoic acid is practically insoluble (in water) and a weakly acidic compound (based on its pKa).  More specifically, 11Z-Eicosenoic acid is a monounsaturated omega-9 fatty acid found in a variety of nuts and plant oils. It is not produced by humans and comes from the diet. It has been found in the red blood cell membrane with increased concentrations in children with regressive autism (PMID: 16581239 ).
Oleamide is an amide of the fatty acid oleic acid. It is an endogenous substance: it occurs naturally in the body of animals. It accumulates in the cerebrospinal fluid during sleep deprivation and induces sleep in animals. It is being studied as a potential medical treatment for mood and sleep disorders, and cannabinoid-regulated depression. The mechanism of action of oleamide's sleep inducing effects is an area of current research. It is likely that oleamide interacts with multiple neurotransmitter systems. Oleamide is structurally related to the endogenous cannabinoid anandamide, and has the ability to bind to the CB1 receptor as a full agonist.
Diethylhexyl adipate (DEHA) is an indirect food additive arising from contact with polymers and adhesives. DEHA is a plasticizer. DEHA is an ester of 2-ethylhexanol and adipic acid. Its chemical formula is C22H42O4.
Maltitol is a sugar alcohol (polyol) used as a sugar substitute. It has 90% the sweetness of sugar and nearly identical properties, except for browning. It is used to very easily replace sugar and has less food energy, does not promote tooth decay and has a somewhat lower blood sugar response. Unfortunately, maltitol is well known to cause gastric distress, particularly if consumed in great quantities. Chemically, maltitol is also known as 4-O-alpha-Glucopyranosyl-D-sorbitol. Commercially, it is known under trade names such as Maltisorb and Maltisweet. Due to its slow absorption, excessive consumption of Maltitol can have laxative effect and often can cause gas and/or bloating. Maltitol is particularly demonized regarding gastric side effects because it is so easy for food producers to use it in vast quantities (due to its amazingly sugar-like properties) so consumers often end up consuming far more than they could most other sugar alcohols. While this is a major problem with maltitol, many sugar alcohols are far more likely to cause gastric distress than maltitol when compared gram-for-gram.
Squalene is an unsaturated aliphatic hydrocarbon (carotenoid) with six unconjugated double bonds found in human sebum (5%), fish liver oils, yeast lipids, and many vegetable oils (e.g. palm oil, cottonseed oil, rapeseed oil). Squalene is a volatile component of the scent material from Saguinus oedipus (cotton-top tamarin monkey) and Saguinus fuscicollis (saddle-back tamarin monkey) (Hawley's Condensed Chemical Reference). Squalene is a component of adult human sebum that is principally responsible for fixing fingerprints (ChemNetBase). It is a natural organic compound originally obtained for commercial purposes primarily from shark liver oil, though there are botanical sources as well, including rice bran, wheat germ, and olives. All higher organisms produce squalene, including humans. It is a hydrocarbon and a triterpene. Squalene is a biochemical precursor to the whole family of steroids. Oxidation of one of the terminal double bonds of squalene yields 2,3-squalene oxide which undergoes enzyme-catalyzed cyclization to afford lanosterol, which is then elaborated into cholesterol and other steroids. Squalene is a low-density compound often stored in the bodies of cartilaginous fishes such as sharks, which lack a swim bladder and must therefore reduce their body density with fats and oils. Squalene, which is stored mainly in the shark's liver, is lighter than water with a specific gravity of 0.855 (Wikipedia) Squalene is used as a bactericide. It is also an intermediate in the manufacture of pharmaceuticals, rubber chemicals, and colouring materials (Physical Constants of Chemical Substances).
Enterolactone (CAS: 78473-71-9) is a mammalian lignan that has a similar biphenolic structure to lignans from plants. Lignans are compounds with estrogenic properties and are probably the most important source of phytoestrogens in western diets. Mammalian lignans are formed from precursors that are contained mainly in vegetables, whole grain products, and berries, via the action of intestinal microflora. Enterolactone is produced in the colon by the action of bacteria on secoisolariciresinol, matairesinol, and its glycosides. Secoisolariciresinol is converted to enterodiol which is subsequently converted to enterolactone as it passes through the colon. Matairesinol is converted directly to enterolactone. Enterolactone has been shown to possess weakly estrogenic and antiestrogenic activities, and it has been suggested that the high production of this antiestrogenic mammalian lignans in the gut may serve to protect against breast cancer in women and prostate cancer in men; however epidemiological evidence to date is conflicting (PMID: 16168401, 12270221, 11216511, 12107024). Enterolactone is a biomarker for the consumption of soybeans and other soy products.
Hexacosanoic acid, or cerotic acid, is a 26-carbon long-chain saturated fatty acid with the chemical formula CH3(CH2)24COOH. It is most commonly found in beeswax and carnauba wax, and is a white crystalline solid. Cerotic acid is also a type of very long chain fatty acid that is often associated with the disease adrenoleukodystrophy, which involves the excessive saturation of unmetabolized fatty acid chains, including cerotic acid, in the peroxisome. Hexacosanoic acid, also known as C26:0 or N-hexacosanoate, belongs to the class of organic compounds known as very long-chain fatty acids. These are fatty acids with an aliphatic tail that contains at least 22 carbon atoms. Hexacosanoic acid is a very hydrophobic molecule, practically insoluble in water, and relatively neutral. Hexacosanoic acid is a potentially toxic compound.
Cholestenone belongs to the class of organic compounds known as cholesterols and derivatives. Cholesterols and derivatives are compounds containing a 3-hydroxylated cholestane core. Thus, cholestenone is considered to be a sterol lipid molecule. Cholestenone is a very hydrophobic molecule, practically insoluble in water, and relatively neutral.
Cholesteryl pentanoate is an ester of cholesterol. Fatty acid esters of cholesterol constitute about two-thirds of the cholesterol in the plasma. Cholesterol is a sterol (a combination steroid and alcohol) and a lipid found in the cell membranes of all body tissues, and transported in the blood plasma of all animals. The accumulation of cholesterol esters in the arterial intima (the innermost layer of an artery, in direct contact with the flowing blood) is a characteristic feature of atherosclerosis. Atherosclerosis is a disease affecting arterial blood vessels. It is a chronic inflammatory response in the walls of arteries, in large part to the deposition of lipoproteins (plasma proteins that carry cholesterol and triglycerides). Cholesteryl esters, formed by the esterification of cholesterol with long-chain fatty acids, on one hand, are the means by which cholesterol is transported through the blood by lipoproteins, on the other, the way cholesterol itself can be accumulated in the cells. (PMID: 15939411).
Pregnenolone is a derivative of cholesterol, the product of cytochrome P450 side-chain cleavage (EC 1.14.15.6, CYP11A1. This reaction consists of three consecutive monooxygenations, a 22-hydroxylation, a 20-hydroxylation, and the cleavage of the C20-C22 bond, yielding pregnenolone. Pregnenolone is the precursor to gonadal steroid hormones and the adrenal corticosteroids. This reaction occurs in steroid hormone-producing tissues such as the adrenal cortex, corpus luteum, and placenta. The most notable difference between the placenta and other steroidogenic tissues is that electron supply to CYP11A1 limits the rate at which cholesterol is converted into pregnenolone in the placenta. The limiting component for electron delivery to CYP11A1 is the concentration of adrenodoxin reductase in the mitochondrial matrix which is insufficient to maintain the adrenodoxin pool in a fully reduced state. Pregnenolone is also a neurosteroid, and is produced in the spinal cord; CYP11A1 is the key enzyme catalyzing the conversion of cholesterol into pregnenolone, the rate-limiting step in the biosynthesis of all classes of steroids, and has been localized in sensory networks of the spinal cord dorsal horn. In the adrenal glomerulosa cell, angiotensin II, one of the major physiological regulators of mineralocorticoid synthesis, appears to affect most of the cholesterol transfer to the mitochondrial outer membrane and many steps in the transport to the inner membrane. Thus, it exerts a powerful control over the use of cholesterol for aldosterone production (PMID: 17222962, 15823613, 16632873, 15134809).
Cortexolone, also known as cortodoxone or 11-deoxycortisol, belongs to the class of organic compounds known as 21-hydroxysteroids. These are steroids carrying a hydroxyl group at the 21-position of the steroid backbone. Thus, cortexolone is considered to be a steroid molecule. Cortexolone is an endogenous glucocorticoid steroid hormone, and a metabolic intermediate in the synthesis of cortisol. It was first described by Tadeusz Reichstein in 1938 and named as Substance S. It has also been referred to as Reichstein's Substance S or Compound S. Cortexolone acts as a glucocorticoid, though it is less potent than cortisol. Cortexolone is synthesized from 17Œ±-hydroxyprogesterone by 21-hydroxylase and is converted to cortisol by 11Œ≤-hydroxylase. As a result, the level of cortexolone is often measured in patients to diagnose impaired cortisol synthesis, to identify any enzyme deficiency that may be causing impairment along the pathway to cortisol, and to differentiate adrenal disorders. Cortexolone in mammals has limited biological activity and mainly acts as metabolic intermediate within the glucocorticoid pathway, leading to cortisol. On the other hand, in sea lampreys, cortexolone is the major glucocorticoid, with mineralocorticoid activity. Cortexolone in sea lampreys binds to specific corticosteroid receptors and is involved in intestinal osmoregulation and in sea lamprey at metamorphosis, a process in which they develop seawater tolerance before downstream migration.
11-Deoxycorticosterone (also called desoxycortone, 21-hydroxyprogesterone, DOC, or simply deoxycorticosterone) is a steroid hormone produced by the adrenal gland that possesses mineralocorticoid activity and acts as a precursor to aldosterone. It is classified as a member of the 21-hydroxysteroids. 21-hydroxysteroids are steroids carrying a hydroxyl group at the 21-position of the steroid backbone. Deoxycorticosterone is very hydrophobic, practically insoluble (in water), and relatively neutral. Deoxycorticosterone can be synthesized from progesterone by 21-beta-hydroxylase and is then converted to corticosterone by 11-beta-hydroxylase. Corticosterone is then converted to aldosterone by aldosterone synthase. Deoxycorticosterone stimulates the collecting tubules in the kidney to continue to excrete potassium in much the same way that aldosterone does. Deoxycorticosterone has about 1/20 of the sodium retaining power of aldosterone and about 1/5 the potassium excreting power of aldosterone (Wikipedia). Deoxycorticosterone can be found throughout all human tissues and has been detected in amniotic fluid and blood. When present in sufficiently high levels, deoxycorticosterone can act as a hypertensive agent and a metabotoxin. A hypertensive agent increases blood pressure and causes the production of more urine. A metabotoxin is an endogenously produced metabolite that causes adverse health effects at chronically high levels.  Chronically high levels of deoxycorticosterone are associated with congenital adrenal hyperplasia (CAH) and with adrenal tumors producing deoxycorticosterone (PMID: 20671982). High levels of this mineralocorticoid are associated with resistant hypertension, which can result in polyuria, polydipsia, increased blood volume, edema, and cardiac enlargement. Deoxycorticosterone can be used to treat adrenal insufficiency. In particular, desoxycorticosterone acetate (DOCA) is used as replacement therapy in Addison's disease.
Corticosterone, also known as 17-deoxycortisol, belongs to the class of organic compounds known as 21-hydroxysteroids. These are steroids carrying a hydroxyl group at the 21-position of the steroid backbone. Thus, corticosterone is considered to be a steroid lipid molecule. Corticosterone is a very hydrophobic molecule, practically insoluble in water, and relatively neutral. In many species, including amphibians, reptiles, rodents and birds, corticosterone is a main glucocorticoid,[3] involved in regulation of energy, immune reactions, and stress responses. Corticosterone is the precursor molecule to the mineralocorticoid aldosterone, one of the major homeostatic modulators of sodium and potassium levels in vivo.
Estrone is a major mammalian estrogen. The conversion of the natural C19 steroids, testosterone and androstenedione into estrone is dependent on a complex key reaction catalyzed by the cytochrome P450 aromatase (EC 1.14.14.1, unspecific monooxygenase), which is expressed in many tissues of the adult human (e.g. ovary, fat tissue), but not in the liver. The ovaries after menopause continue to produce androstenedione and testosterone in significant amounts and these androgens are converted in fat, muscle, and skin into estrone. When women between the ages of 45 and 64 years have prophylactic oophorectomy (when hysterectomy is performed for benign disease to prevent the development of ovarian cancer), evidence suggests that oophorectomy increases the subsequent risk of coronary heart disease (CHD) and osteoporosis. Whereas 14,000 women die of ovarian cancer every year nearly 490,000 women die of heart disease and 48,000 women die within 1 year after hip fracture. Therefore, the decision to perform prophylactic oophorectomy should be approached with great caution for the majority of women who are at low risk of developing ovarian cancer. Steroid sulfatase (EC 3.1.6.2, STS) hydrolyzes steroid sulfates, such as estrone sulfate to estrone which can be converted to steroids with potent estrogenic properties, that is, estradiol; STS activity is much higher in breast tumors and high levels of STS mRNA expression in tumors are associated with a poor prognosis. The biological roles of estrogens in tumorigenesis are certainly different between the endometrium and breast, although both are considered "estrogen-dependent tissues". 17beta-hydroxysteroid dehydrogenases (EC 1.1.1.62, 17-HSDs) are enzymes involved in the formation of active sex steroids. estrone is interconverted by two enzymes 17-HSD types. Type 1 converts estrone to estradiol and Type 2 catalyzes the reverse reaction. (PMID: 17653961, 17513923, 17470679, 17464097).
2-Hydroxyestradiol (2-OHE2), also known as estra-1,3,5(10)-triene-2,3,17beta-triol, is an endogenous steroid, catechol estrogen. 2-Hydroxyestradiol belongs to the class of organic compounds known as estrogens and derivatives. These are steroids with a structure containing a 3-hydroxylated estrane. Thus, 2-hydroxyestradiol is considered to be a steroid molecule. It is a metabolite of estradiol, as well as a positional isomer of estriol. Transformation of estradiol to 2-hydroxyestradiol is a major metabolic pathway of estradiol in the liver. 2-Hydroxyestradiol is generated from estradiol via several cytochrome P450 enzymes. Specifically, CYP1A2 and CYP3A4 are the major enzymes catalyzing the 2-hydroxylation of estradiol. Conversion of estradiol into 2-hydroxyestradiol has been detected in the liver, uterus, breast, kidney, brain, and pituitary gland, as well as the placenta. 2-Hydroxyestradiol binds, with a low affinity, to estrogen receptors. 2-Hydroxyestradiol has approximately 7% and 11% of the affinity of estradiol at the estrogen receptors (ERs) ERalpha and ERbeta, respectively (PMID: 9048584). 2-Hydroxyestradiol is a catechol estrogen and in this regard bears some structural resemblance to the catecholamines dopamine, norepinephrine (noradrenaline), and epinephrine (adrenaline) (PMID: 447670).  In accordance, 2-hydroxyestradiol has been found to interact with catecholamine systems. The steroid is known to compete with catecholamines for binding to catechol O-methyltransferase and tyrosine hydroxylase and to competitively inhibit these enzymes (PMID: 447670). Inactivity of COMT blocks inactivation of catechol hormones and catecholamine neurotransmitters. 2-Hydroxyestradiol is also reported to inhibit angiongensis and tumor cell growth (PMID: 9472688).
16a-Hydroxyestrone or 16alpha-hydroxyestrone (16Œ±-OH-E1 or 16a OHE1), or hydroxyestrone, is an endogenous steroidal estrogen and a major metabolite of estrone and estradiol.  16a-hydroxyestrone belongs to the class of organic compounds known as estrogens and derivatives. These are steroids with a structure containing a 3-hydroxylated estrane. Thus, 16a-hydroxyestrone is considered to be a steroid molecule. 16a-hydroxyestrone is found in all vertebrates. Vertebrates, especially mammals, metabolizes estrogen into two major pathways and one minor. The two major pathways lead to 2-hydroxyestrone and 16a-hydroxyestrone (2-OHE1 and 16a OHE1 respectively). The minor pathway leads to 4-hydroxyestrone (4-OHE1). 2a-hydroxyestrone is considered to be the good metabolite (PMID: 8943806) as 2-hydroxyestrone does not stimulate cell growth and it blocks the action of stronger estrogens that may be carcinogenic. 16a-Hydroxyestrone, on the other hand, has a significantly stronger estrogenic activity, and studies show that it may increase the risk of breast cancer. The binding of 16a-hydroxyestrone to the estrogen receptor is reported to be covalent and irreversible (PMID: 3186693). A low urinary ratio of 2-hydroxyestrone to 16-alpha-hydroxyestrone is a strong predictor of breast cancer risk among women (PMID: 19502596).
Estriol is a metabolite of estrone metabolized via 16alpha-hydroxyestrone through the enzyme 16alpha-hydroxysteroid dehydrogenase (EC 1.1.1.147) or to 2- or 4-hydroxyestrone (catechol estrogens) by the action of catecho-O-methyltransferase (EC 2.1.1.6). The latter metabolites can be formed in the brain and may compete with receptors for catecholamines. Metabolites are conjugated with sulfate or glucuronide before excretion by the kidney. During pregnancy, estriol constitutes 60-70% of the total estrogens, increasing to 300-500-fold in relation to non-pregnant women. The late term human fetus produces relatively large amounts of 16 alphahydroxy DHEA, which serves the mother as a precursor of estriol. It has been shown that 90% of the precursors for the formation of estriol are of fetal origin. If abnormal maternal serum screening results, specifically low levels of unconjugated estriol in the second trimester are detected, a diagnosis of Smith-Lemli-Opitz syndrome (SLOS),or RSH is suspected. SLOS is an autosomal recessive disorder caused by mutations of the gene encoding 7-dehydrocholesterol reductase (EC 1.3.1.21, DHCR7). (PMID: 16202579, 16112271, 16097001).
Allopregnanolone is a neuroactive metabolite of progesterone and a barbiturate-like modulator of central gamma-aminobutyric acid receptors that modify a range of behaviors, including the stress response. is a steroid created in the body when progesterone, the female sex hormone, is metabolized. Typically, THP (allopregnanolone) is released in the brain in response to stress, and quiets the neural system within 30 minutes of escalation. This steroid hormone has recently been found to be responsible for the extreme mood swings found in teenagers. In adults and pre-pubescent chlidren THP normally helps soothe the activity of brain cells by binding to GABA receptors that inhibit accelerating electrical activity. However, in pubescent teenagers THP actually becomes a GABA receptor antagonist. GABA (gamma-aminobutyric acid) is the primary inhibitory neurotransmitter in the brain with most sedatives (tranquilizers, anesthetics and alcohol) acting on the GABA receptor.
5a-Pregnane-3,20-dione is a biologically active 5-alpha-reduced metabolite of plasma progesterone. It is the immediate precursor of 5-alpha-pregnan-3-alpha-ol-20-one (allopregnanolone), a neuroactive steroid that binds with GABA(A) receptor.
This compound belongs to the family of Gluco/mineralocorticoids, Progestogins and Derivatives. These are steroids whose structure is based on an hydroxylated prostane moiety.
17a-Hydroxypregnenolone is a 21-carbon steroid that is converted from pregnenolone by cytochrome P450 17alpha hydroxylase/C17,20 lyase (CYP17, EC 1.14.99.9). 17a-Hydroxypregnenolone is an intermediate in the delta-5 pathway of biosynthesis of gonadal steroid hormones and the adrenal corticosteroids. The first, rate-limiting and hormonally regulated step in the biosynthesis of all steroid hormones is the conversion of cholesterol to pregnenolone. The conversion of cholesterol to pregnenolone is accomplished by the cleavage of the cholesterol side chain, catalyzed by a mitochondrial cytochrome P450 enzyme termed P450scc where scc designates Side Chain Cleavage. All steroid hormones are made from the pregnenolone produced by P450scc; thus, the presence or absence of each of the activities of CYP17 directs this pregnenolone towards its final metabolic pathway. While all cytochrome P450 enzymes can catalyze multiple reactions on a single active site, CYP17 is the only one described to date in which these multiple activities are differentially regulated by a physiologic process. 17a-Hydroxypregnenolone is converted to dehydroepiandrosterone by the 17,20 lyase activity of CYP17. The ratio of the 17,20 lyase to 17 alpha-hydroxylase activity of CYP17 determines the ratio of C21 to C19 steroids produced. This ratio is regulated post-translationally by at least three factors: the abundance of the electron-donating protein P450 oxidoreductase, the presence of cytochrome b5, and the serine phosphorylation of CYP17. (PMID: 12573809).
The neurosteroid allotetrahydrodeoxycorticosterone (THDOC) is an allosteric modulator of the GABA(A) receptor. Although the role of THDOC within the brain is undefined, recent studies indicate that stress induces THDOC to levels that can activate GABA(A) receptors. These results might have significant implications for human stress-sensitive conditions such as epilepsy, post-traumatic stress disorder and depression. (PMID 12628349).
21-hydroxypregnenolone is an essential intermediate in corticosterone synthesis. The hydrolysis of 21-hydroxypregnenolone of fetal origin by steryl-sulfatase (SOS, EC 3.1.6.2), may be important in the biosynthesis of deoxycorticosterone, which is present in the plasma of pregnant women in high concentration. 21-hydroxypregnenolone has been identified in follicular fluid from follicles of women. Pregnenolone is transformed to 21-hydroxypregnenolone by human adrenal microsomal preparations, suggesting the involvement of alternative paths via 17a,21-dihydroxypregnenolone in human. (PMID 974176, 3347051, 3495701, 7382480, 6247575).
20alpha-Dihydroprogesterone is a biologically active 20-alpha-reduced metabolite of progesterone. It is converted from progesterone to 20-alpha-hydroxypregn-4-en-3-one by the 20-alpha-hydroxysteroid dehydrogenase in the corpus luteum and the placenta. Progesterone is a C-21 steroid hormone involved in the female menstrual cycle, pregnancy (supports gestation), and embryogenesis of humans and other species. Progesterone belongs to a class of hormones called progestagens, and is the major naturally occurring human progestagen (Wikipedia). During implantation and gestation, progesterone appears to decrease the maternal immune response to allow for the acceptance of the pregnancy. Progesterone decreases contractility of the uterine smooth muscle. The fetus metabolizes placental progesterone in the production of adrenal mineralo- and glucosteroids. A drop in progesterone levels is possibly one step that facilitates the onset of labour. In addition, progesterone inhibits lactation during pregnancy. The fall in progesterone levels following delivery is one of the triggers for milk production (Wikipedia).
Pregnanolone, also known as eltanolone or 3alpha-hydroxy-5beta-pregnan-20-one, belongs to the class of organic compounds known as gluco/mineralocorticoids, progestogens, and derivatives. These are steroids with a structure based on a hydroxylated prostane moiety. Pregnanolone is considered to be practically insoluble (in water) and basic. Pregnanolone is an endogenous inhibitory neurosteroid that is produced in the body from progesterone. It is closely related to allopregnanolone, which has similar properties (Wikipedia).
Calcitroic acid (1 alpha-hydroxy-23 carboxy-24,25,26,27-tetranorvitamin D(3)) is a metabolite of 1 alpha, 25-dihydroxyvitamin D(3) (calcitriol). It is soluble in water, and is excreted in urine. This deactivation process involves a series of oxidation reactions at C24 and C23 leading to side-chain cleavage and, ultimately, formation of the calcitroic acid. This deactivation involves the loss of carbons 24, 25, 26, and 27 and the oxidation of carbon 23 to a carboxylic acid. Calcitroic acid is also a major terminal product for the deactivation of 1&#945;,25-dihydroxyvitamin D2. Both the kidney and the intestine metabolize 1,25-dihydroxyvitamin D3 through the C-24 oxidation pathway according to the following steps: 1,25-dihydroxyvitamin D3----1,24,25-trihydroxyvitamin D3----1,25-dihydroxy-24-oxovitamin D3-----1,23,25-trihydroxy-24-oxovitamin D3 (PMID: 2719932). The C-24 oxidation pathway leading to the formation of calcitroic acid has been reported to be present in bone cells, but the C-23 oxidation pathway leading to the formation of 1 alpha, 25-(OH)2D3-26,23-lactone has not been described in bone cells, even though 1 alpha, 25-(OH)2D3-26,23-lactone is noted to have a significant effect on bone formation. (PMID: 7664636).
The active metabolite of Folic acid, is used principally as its calcium salt as an antidote to folic acid antagonists which block the conversion of folic acid to folinic acid. Folic acid, a water-soluble B-complex vitamin, is found in foods such as liver, kidneys, yeast, and leafy, green vegetables. Folic acid is used to diagnose folate deficiency and to treat topical sprue and megaloblastic and macrocytic anemias, hematologic complications resulting from a deficiency in folic acid. A member of the vitamin B family that stimulates the hematopoietic system. It is present in the liver and kidney and is found in mushrooms, spinach, yeast, green leaves, and grasses (poaceae). Folic acid is used in the treatment and prevention of folate deficiencies and megaloblastic anemia.
Eicosapentaenoic acid (EPA or also icosapentaenoic acid) is an important polyunsaturated fatty acid found in fish oils. It serves as the precursor for the prostaglandin-3 and thromboxane-3 families. A diet rich in eicosapentaenoic acid lowers serum lipid concentration, reduces incidence of cardiovascular disorders, prevents platelet aggregation, and inhibits arachidonic acid conversion into the thromboxane-2 and prostaglandin-2 families. Eicosapentaenoic acid is an omega-3 fatty acid. In physiological literature, it is given the name 20:5(n-3). Its systematic chemical name is all-cis-5,8,11,14,17-icosapentaenoic acid. It also has the trivial name timnodonic acid. Chemically, EPA is a carboxylic acid with a 20-carbon chain and five cis double bonds; the first double bond is located at the third carbon from the omega end. Because of the presence of double bonds, EPS is a polyunsaturated fatty acid. Metabolically it acts as a precursor for prostaglandin-3 (which inhibits platelet aggregation), thromboxane-3, and leukotriene-5 groups. It is found in fish oils of cod liver, herring, mackerel, salmon, menhaden, and sardine. It is also found in human breast milk (Wikipedia).
Adrenochrome semiquinone is the intermediate in the formation of adrenochrome&#65292;which is a reaction in which a total of two electrons are removed. Adrenochrome formed in the cells can also suffer conjugation with cellular GSH, leading to its depletion, or polymerize into several other compounds.
Clofarabine is a purine nucleoside antimetabolite that is being studied in the treatment of cancer. It is marketed in the U.S. and Canada as Clolar. In Europe and Australia/New Zealand the product is marketed under the name Evoltra. Clofarabine is used in paediatrics to treat a type of leukaemia called relapsed or refractory acute lymphoblastic leukaemia (ALL), only after at least two other types of treatment have failed. It is not known if the drug extends life expectancy. Some investigations of effectiveness in cases of acute myeloid leukaemia (AML) and juvenile myelomonocytic leukaemia (JMML) have been carried out.
Endalin belongs to the family of Pyrimidine Nucleosides and Analogues. These are compounds comprising a pyrimidine base attached to a sugar.
5-Methylcytidine belongs to the class of organic compounds known as pyrimidine nucleosides. Pyrimidine nucleosides are compounds comprising a pyrimidine base attached to a ribosyl or deoxyribosyl moiety.
Nnal-n-oxide belongs to the family of Pyridines and Derivatives. These are compounds containing a pyridine ring, which is a six-member aromatic heterocycle which consists of one nitrogen atom and five carbon atoms.
5-Methoxytryptamine, also known as mexamine or 5-MT, belongs to the class of organic compounds known as tryptamines and derivatives. Tryptamines and derivatives are compounds containing the tryptamine backbone, which is structurally characterized by an indole ring substituted at the 3-position by an ethanamine. It is biosynthesized via the deacetylation of melatonin in the pineal gland. 5-MT acts as a full agonist at the 5-HT1, 5-HT2, 5-HT4, 5-HT6, and 5-HT7 receptors. 5-Methoxytryptamine exists in all living organisms, ranging from bacteria to humans. Its affinity for the 5-HT5A receptor is unknown. It has no affinity for the 5-HT3 receptor and is affinity for the 5-HT1E receptor is very weak in comparison to the other 5-HT1 receptors. 5-MT has been shown to occur naturally in the body in low levels.
2,3-Dihydro-2,3-dihydroxy-4-(4-methoxyphenyl)-1H-phenalen-1-one is found in fruits. 2,3-Dihydro-2,3-dihydroxy-4-(4-methoxyphenyl)-1H-phenalen-1-one is a constituent of Musa acuminata (dwarf banana) infected with Colletotrichum musae.
5-Fluorodeoxyuridine monophosphate is a metabolite of floxuridine. Floxuridine (also 5-fluorodeoxyuridine) is an oncology drug that belongs to the class known as antimetabolites. The drug is most often used in the treatment of colorectal cancer. (Wikipedia)
Obtained from sediment in wine manuf. It is used in food processing as a nutrient, pH control agent and leavening agent. Potassium bitartrate can be used with white vinegar to make a paste-like cleaning agent. It is a vital ingredient in Play-Doh and gingerbread house icing. This mixture is sometimes mistakenly made with vinegar and sodium bicarbonate (baking soda), which actually react to neutralise each other, creating carbon dioxide and a sodium acetate solution.; Potassium bitartrate, also known as potassium hydrogen tartrate, has formula KC4H5O6. It is a byproduct of winemaking. In cooking it is known as cream of tartar. It is the potassium acid salt of tartaric acid, a carboxylic acid. Potassium bitartrate is found in common grape.
Etoposide glucuronide is a metabolite of etoposide. Etoposide phosphate is an anticancer agent, which belongs to the drug type topoisomerase inhibitor. (Wikipedia)
A nitroimidazole used to treat amebiasis; vaginitis; trichomonas infections; giardiasis; anaerobic bacteria; and treponemal infections. It has also been proposed as a radiation sensitizer for hypoxic cells. According to the Fourth Annual Report on Carcinogens (NTP 85-002, 1985, p133), this substance may reasonably be anticipated to be a carcinogen (Merck, 11th ed).
Lacto-N-difucohexaose (LDFH) is a fucosyloligosaccharide present in human milk and colostrum. Human colostrum is known to be important for the protection of infants against infection by pathogenic microorganisms. This protection is thought to be due, partially, to various neutral and acidic oligosaccharides that are present in colostrum and milk. Moderate-to-severe diarrhea of all causes occurs less often in infants whose milk contains high levels of total 2-linked fucosyloligosaccharides as a percent of milk oligosaccharide. Calicivirus diarrhea occurs less often in infants whose mother's milk contains high levels of LDFH. (PMID: 15343178, 17375110, 12568665).
Guggulsterone is an ingredient in many nutritional supplements. Guggulsterone is a plant sterol derived from the gum resin (guggulu) of the tree Commiphora mukul. This sterol can inhibit NF-&#954;B activation and downregulate the expression of inflammatory gene products such as COX-2 and MMP-9, which are major players in the development of arthritis. Guggulsterone also can suppress osteoclastogenesis induced by RANKL (receptor activator of NF-&#954;B ligand), a bone-resorbing cytokine. The anti-inflammatory activity of C. mukul (guggul) has been compared with that of NSAIDs, namely phenylbutazone and ibuprofen. Guggulsterone is used to treat obesity, diabetes, hyperlipidemia, atherosclerosis, and osteoarthritis, and has been recently shown to antagonize the farnesoid X receptor and decrease the expression of bile acid-activated genes. It modulates activation of NF-kappaB, which has been closely linked with inflammatory diseases affected by guggulsterone. (PMID: 17475558, 15322087).
1-Butylamine, also known as 1-aminobutan or N-C4H9NH2, belongs to the class of organic compounds known as monoalkylamines. These are organic compounds containing an primary aliphatic amine group. Butylamine is a colourless liquid which acquires a yellow colour upon storage in air. 1-Butylamine is an ammonia and fishy tasting compound. 1-Butylamine has been detected, but not quantified, in several different foods, such as cocoa and cocoa products, brassicas, fishes, garden tomato, and milk and milk products. This could make 1-butylamine a potential biomarker for the consumption of these foods. It is one of the four isomeric amines of butane. It is known to have the fishy, ammonia-like odor common to amines. Found in mulberry leaves, kale, swede, tomato, wheat bread, cheeses, caviar, raw fatty fish, cooked chicken or beef, beer, cocoa, and other foodstuffs.
A potent anti-arrhythmia agent, effective in a wide range of ventricular and atrial arrhythmias and tachycardias. Paradoxically, however, in myocardial infarct patients with either symptomatic or asymptomatic arrhythmia, flecainide exacerbates the arrhythmia and is not recommended for use in these patients. [PubChem]
A potent anti-arrhythmia agent, effective in a wide range of ventricular and atrial arrhythmias and tachycardias. Paradoxically, however, in myocardial infarct patients with either symptomatic or asymptomatic arrhythmia, flecainide exacerbates the arrhythmia and is not recommended for use in these patients. [PubChem]
Ethchlorvynol is only found in individuals that have used or taken this drug. It is a sedative and hypnotic drug. It has been used to treat insomnia, but has been largely superseded and is only offered where an intolerance or allergy to other drugs exists. [Wikipedia]Although the exact mechanism of action is unknown, ethchlorvynol appears to depress the central nervous system in a manner similar to that of barbiturates. Barbiturates bind at a distinct binding sites associated with a Cl<sup>-</sup> ionopore at the GABA<sub>A</sub> receptor, increasing the duration of time for which the Cl<sup>-</sup> ionopore is open. The post-synaptic inhibitory effect of GABA in the thalamus is, therefore, prolonged.
Neryl isovalerate is a constituent of numerous plant species Neryl isovalerate is a flavouring agent
(±)-2-Octanol, also known as 2-octanol or 2-hydroxyoctane, belongs to the class of organic compounds known as fatty alcohols. These are aliphatic alcohols consisting of a chain of a least six carbon atoms. (±)-2-Octanol is a very hydrophobic molecule, practically insoluble in water, and relatively neutral. Thus, (±)-2-octanol is considered to be a fatty alcohol lipid molecule
Fructose 6-phosphate (F6P) belongs to the class of organic compounds known as hexose phosphates. These are carbohydrate derivatives containing a hexose substituted by one or more phosphate groups. F6P is a derivative of fructose, which has been phosphorylated at the 6-hydroxy group. Fructose 6-phosphate is a fundamental metabolite and exists in all living species, ranging from bacteria to plants to humans. The great majority of glucose is converted to fructose 6-phosphate as part of the glycolytic metabolic pathway (glycolysis). Specifically, F6P is produce is produced by the isomerisation of glucose 6-phosphate via the enzyme phosphoglucose isomerase. F6P is in turn further phosphorylated to fructose-1,6-bisphosphate by the enzyme phosphofructokinase-1. Glycolysis is the metabolic pathway that converts glucose into pyruvic acid. The free energy released in this process is used to form ATP and reduced nicotinamide adenine dinucleotide (NADH). In addition to its key involvement in glycolysis, fructose 6-phosphate can also be biosynthesized from glucosamine 6-phosphate via the enzyme glucosamine-6-phosphate isomerase 1. In addition, fructose 6-phosphate and L-glutamine can be converted into glucosamine 6-phosphate and L-glutamic acid through the action of the enzyme glutamine--fructose-6-phosphate aminotransferase.
2-[Octahydro-4,7-dimethyl-1-oxocyclopenta[c]pyran-3-yl]nepetalactam is found in herbs and spices. 2-[Octahydro-4,7-dimethyl-1-oxocyclopenta[c]pyran-3-yl]nepetalactam is isolated from a commercial sample of catnip oil (Nepeta cataria).
2,4-Diaminobutyric acid, also known as 2,4-diaminobutanoate or Dbu, belongs to the class of organic compounds known as alpha amino acids. These are amino acids in which the amino group is attached to the carbon atom immediately adjacent to the carboxylate group (alpha carbon). 2,4-Diaminobutyric acid is a very hydrophobic molecule, practically insoluble in water, and relatively neutral. 2,4-Diaminobutyric acid exists in all living organisms, ranging from bacteria to humans. Outside of the human body, 2,4-Diaminobutyric acid has been detected, but not quantified in cow milk. This could make 2,4-diaminobutyric acid a potential biomarker for the consumption of these foods. 2,4-Diaminobutyric acid is a non-physiological, cationic amino acid analogue that is transported into cells by System A with potent antitumoral activity in vitro against human glioma cells, the result of the pronounced concentrated uptake of DAB in glioma cells to the extent that a cellular lysis could occur due to osmotic reasons.
Benzyl isothiocyanate is found in brassicas. Benzyl isothiocyanate is isolated from Tropaeolum majus (garden nasturtium) and Lepidium sativum (garden cress), also in other plants especially in the Cruciferae. Potential nutriceutical.
In humans, valproylglycine has been identified as a urinary metabolite of Valproic acid (Abbott and Anari 1999) along with VPA-glutamate conjugate.Valproic acid (VPA; 2-n-propylpentanoic acid) is widely used as a major drug in the treatment of epilepsy and in the control of several types of seizures.
Pandamarilactone 31 is a food flavouring. Pandamarilactone 31 is an alkaloid from leaves of Pandanus amaryllifolius.
Cuminaldehyde is the biologically active constituent of Cuminum cyminum seed oil. C. cyminum seed-derived materials have an inhibitory effect in vitro against rat lens aldose reductase and alpha-glucosidase. This inhibitory action cuminaldehyde suggest a potential utility as an antidiabetic therapeutic. (PMID:15796577). Cuminaldehyde is a volatile compound representative of cumin aroma present in trace amounts in the blood and milk of ewes fed with cumin seed. (PMID:8738023). The terpenoid cuminaldehyde, undergoes reduction biotransformation in mammals, but not oxidation. (PMID:2815827).
Famprofazone belongs to the family of Phenylpyrazoles. These are compounds containing a phenylpyrazole skeleton, which consists of a pyrazole bound to a phenyl group.
Herniarin, also known as 7-methoxycoumarin or ayapanin, belongs to the class of organic compounds known as coumarins and derivatives. These are polycyclic aromatic compounds containing a 1-benzopyran moiety with a ketone group at the C2 carbon atom (1-benzopyran-2-one). Herniarin is a sweet, balsamic, and tonka tasting compound. Herniarin has been detected, but not quantified, in several different foods, such as barley, tarragons, roman camomiles, fruits, and wild celeries. This could make herniarin a potential biomarker for the consumption of these foods.
Auranofin is only found in individuals that have used or taken this drug. It is a organogold compound classified by the World Health Organization as an antirheumatic agent. Auranofin appears to induce heme oxygenase 1 (HO-1) mRNA. Heme oxygenase 1 is an inducible heme-degrading enzyme with anti-inflammatory properties.Exactly how auranofin works is not well understood. It may act as an inhibitor of kappab kinase and thioredoxin reductase which would lead to a decreased immune response and decreased free radical production, respectively. In patients with inflammatory arthritis, such as adult and juvenile rheumatoid arthritis, gold salts can decrease the inflammation of the joint lining. This effect can prevent destruction of bone and cartilage.
beta-Aminopropionitrile is a toxic amino-acid derivative. On an unusual case of the Cantrell-sequence in a premature infant with associated dysmelia, aplasia of the right kidney, cerebellar hypoplasia and circumscribed aplasia of the cutis, maternal history suggested an occupational exposure to aminopropionitriles prior to pregnancy. The characteristic features of the Cantrell-sequence--anterior thoraco-abdominal wall defect with ectopia cordis and diaphragm, sternum, pericardium, and heart defects--have been observed in animals following maternal administration of beta-aminopropionitrile. Some species of lathyrus (chickling pea, Lathyrus sativus- related), notably Lathyrus odoratus, are unable to induce human lathyrism but contain beta-aminopropionitrile, that induces pathological changes in bone ("osteolathyrism") and blood vessels ("angiolathyrism") of experimental animals without damaging the nervous system. The administration of beta-aminopropionitrile has been proposed for pharmacological control of unwanted scar tissue in human beings. beta-Aminopropionitrile is a reagent used as an intermediate in the manufacture of beta-alanine and pantothenic acid. (PMID:367235, 6422318, 9394169, Am J Perinatol. 1997 Oct;14(9):567-71.).
Thiomorpholine 3-carboxylate is a substrate for: Thiomorpholine-carboxylate dehydrogenase.
16-Hydroxyhexadecanoic acid, also known as 16-hydroxypalmitic acid, is a hydroxylated fatty acid where the terminal (omega) carbon has been hydroxylated. In animal tissues, a family of enzymes termed cytochromes P450s are involved in fatty acid oxidation, hydroxylating with high specificity at the energetically unfavourable terminal (omega) or omega-1 carbons. Hydroxy fatty acids primarily come from the consumption of plant products (vegetables or fruits) or cow’s milk. Omega hydroxy fatty acids are found in the structure of suberin, a lipid polyester present in plant cell walls, and of cutin, a lipid polyester which is a component of the plant cuticle. These apoplastic structures are important plant-environment interfaces that act as barriers limiting water and nutrient loss and protecting plants from radiation and pathogens. 16-Hydroxyhexadecanoic acid and 18-hydroxystearic acid are particularly abundant in cutin in the plant cuticle. 16-Hydroxyhexadecanoic acid has been proposed as a biomarker of beer consumption.
Avocadene is found in avocado. Avocadene is a constituent of avocado (Persea americana)
Polyunsaturated fatty acids such as arachidonate and linoeate, while essential to health maintenance, are subject to random peroxidation by ambient oxygen, resulting in fragmented and reactive decomposition products. One prominent autoxidation product of either trilinolein or arachidonic acid is trans-4,5-epoxy-2(E)-decenal. This aldehyde is responsible for a pungent metallic flavor of decomposed lipids, with a detection threshold of 1.5 pg/l in air.1 trans-4,5-epoxy-2(E)-Decenal also reacts with nucleophiles (lysine amino groups) on proteins, leading to loss of cell function and viability.2 This reactive aldehyde is therefore a useful tool in elucidating the effects of peroxidative damage in experimental models.
Rosoxacin is a quinolone derivative antibiotic for the treatment of bacterial infection of respiratory tract, urinary tract, GI, CNS and immuno compromised patients. Rosoxacin is known to be effective against penicillin resistant strains and is a single dose orally administered drug, which avoids all complications of parenteral administration seen with penicillin, especially anaphylactic shock.
7-Hydroxyheptaphylline is found in fruits. 7-Hydroxyheptaphylline is an alkaloid from root bark of Clausena lansium (wampee).
Bird repellant in grain seed
Brassicasterol belongs to the class of organic compounds known as ergosterols and derivatives. These are steroids containing ergosta-5,7,22-trien-3beta-ol or a derivative thereof, which is based on the 3beta-hydroxylated ergostane skeleton. Thus, brassicasterol is considered to be a sterol lipid molecule. Brassicasterol is a very hydrophobic molecule, practically insoluble (in water), and relatively neutral. Brassicasterol is a potential CSF biomarker for Alzheimer’s disease (PMID: 21585343).
Valganciclovir hydrochloride (Valcyte, manufactured by Roche) is an antiviral medication used to treat cytomegalovirus infections. As the L-valyl ester of ganciclovir, it is actually a prodrug for ganciclovir. After oral administration, it is rapidly converted to ganciclovir by intestinal and hepatic esterases.
Oxybutynin is an anticholinergic medication used to relieve urinary and bladder difficulties, including frequent urination and inability to control urination, by decreasing muscle spasms of the bladder. It competitively antagonizes the M1, M2, and M3 subtypes of the muscarinic acetylcholine receptor.
N-Docosahexaenoyl GABA is considered to be practically insoluble (in water) and acidic.  N-Docosahexaenoyl GABA is a fatty amide lipid molecule
Fluvastatin is an antilipemic agent that competitively inhibits hydroxymethylglutaryl-coenzyme A (HMG-CoA) reductase. HMG-CoA reducuase catalyzes the conversion of HMG-CoA to mevalonic acid, the rate-limiting step in cholesterol biosynthesis. Fluvastatin belongs to a class of medications called statins and is used to reduce plasma cholesterol levels and prevent cardiovascular disease.
Perilla ketone is found in fats and oils. Perilla ketone is isolated from the essential oil of Perilla frutescens (perilla).
S-(11-OH-9-deoxy-delta9,12-PGD2)-glutathione is the glutathione conjugate of S-(11-OH-9-deoxy-delta9,12-PGD2).
D-(+)-Turanose is a reducing disaccharide. Its systematic name is a-D-glucopyranosyl-(1-->3)-a-D-fructofuranose. It is an analog of sucrose not metabolized by higher plants, but rather acquired through the action of sucrose transporters for intracellular carbohydrate signaling. In addition to its involvement in signal transduction, D-(+)-Turanose can also be used as a carbon source by many organisms including numerous species of bacteria and fungi (Wikipedia).
It is used in foods as a binder, emulsifier and anticaking agent.
Annoglabasin F is found in alcoholic beverages. Annoglabasin F is a constituent of Annona glabra (pond apple)
1-(s-glutathionyl)-2,4-dinitrobenzene, also known as Dinitrophenyl-S-glutathione or GS-DNP, is classified as a member of the Oligopeptides. Oligopeptides are organic compounds containing a sequence of between three and ten alpha-amino acids joined by peptide bonds. 1-(s-glutathionyl)-2,4-dinitrobenzene is considered to be practically insoluble (in water) and acidic
Indecainide is only found in individuals that have used or taken this drug. It is a rarely used antidysrhythmic. Indecainide has local anesthetic activity and belongs to the membrane stabilizing (Class 1) group of antiarrhythmic agents; it has electrophysiologic effects characteristic of the IC class of antiarrhythmics.Indecainide acts on sodium channels on the neuronal cell membrane, limiting the spread of seizure activity and reducing seizure propagation. The antiarrhythmic actions are mediated through effects on sodium channels in Purkinje fibers.
Sorbitan oleate is an emulsifier and clarification agent in food preparations (sugar liquor or juice
Levonordefrin is only found in individuals that have used or taken this drug. It acts as a topical nasal decongestant and vasoconstrictor, most often used in dentistry.It is designed to mimic the molecular shape of adrenaline. It binds to alpha-adrenergic receptors in the nasal mucosa. Here it can, therefore, cause vasoconstriction
24-Hydroxycalcitriol stimulates intestinal calcium transport but not bone calcium mobilization or phosphate transport reactions. (PMID: 163578). Vitamin D-24-hydroxylase (24-OHase) is a cytochrome P-450 enzyme that catalyzes the conversion of 1alpha,25-dihydroxyvitamin D3 [1,25-(OH)2D3] to 24-Hydroxycalcitriol (1,24,25-trihydroxyvitamin D3). (PMID: 9165006). The administration of 24-Hydroxycalcitriol at doses of 0.2 and 0.3 microg/kg/day produced strong anabolic effects, especially on vertebral cancellous bone that can prevent estrogen depletion-induced bone loss in ovariectomized (OVX) rats. (PMID: 9115161).
Inositol 1,3,4-trisphosphate (CAS: 98102-63-7), also known as Ins(1,3,4)P3 or I3S, belongs to the class of organic compounds known as inositol phosphates. Inositol phosphates are compounds containing a phosphate group attached to an inositol (or cyclohexanehexol) moiety. Within humans, inositol 1,3,4-trisphosphate participates in several enzymatic reactions. In particular, inositol 1,3,4-trisphosphate can be converted into 1D-myo-inositol 1,3,4,6-tetrakisphosphate through the action of the enzyme inositol-tetrakisphosphate 1-kinase. In addition, inositol 1,3,4-trisphosphate can be converted into inositol 1,3,4,5-tetraphosphate through its interaction with the enzyme inositol-tetrakisphosphate 1-kinase. In humans, inositol 1,3,4-trisphosphate is involved in inositol metabolism. Inositol 1,3,4-trisphosphate is a specific regulator of cellular signalling.
Yohimbine is only found in individuals that have used or taken this drug. It is a plant alkaloid with alpha-2-adrenergic blocking activity. Yohimbine has been used as a mydriatic and in the treatment of impotence. It is also alleged to be an aphrodisiac. [PubChem]Yohimbine is a pre-synaptic alpha 2-adrenergic blocking agent. The exact mechanism for its use in impotence has not been fully elucidated. However, yohimbine may exert its beneficial effect on erectile ability through blockade of central alpha 2-adrenergic receptors producing an increase in sympathetic drive secondary to an increase in norepinephrine release and in firing rate of cells in the brain noradrenergic nuclei. Yohimbine-mediated norepinephrine release at the level of the corporeal tissues may also be involved. In addition, beneficial effects may involve other neurotransmitters such as dopamine and serotonin and cholinergic receptors.
(3E)-2-Propylpent-3-enoic acid is only found in individuals that have used or taken Valproic Acid. (3E)-2-Propylpent-3-enoic acid is a metabolite of Valproic Acid. (3e)-2-propylpent-3-enoic acid belongs to the family of Branched Fatty Acids. These are fatty acids containing a branched chain.
3H-1,2-Dithiole-3-thione is found in brassicas. 3H-1,2-Dithiole-3-thione is isolated from Brassica oleracea var. capitata and other crucifers. Potential nutriceutica
4-Bromocatechol is classified as a member of the Catechols. Catechols are compounds containing a 1,2-benzenediol moiety. 4-Bromocatechol is considered to be soluble (in water) and acidic
Phentermine is only found in individuals that have used or taken this drug. It is a central nervous system stimulant and sympathomimetic with actions and uses similar to those of dextroamphetamine. It has been used most frequently in the treatment of obesity. [PubChem]Phentermine is an amphetamine that stimulates neurons to release or maintain high levels of a particular group of neurotransmitters known as catecholamines; these include dopamine and norepinephrine. High levels of these catecholamines tend to suppress hunger signals and appetite. The drug seems to inhibit reuptake of noradrenaline, dopamine, and seratonin through inhibition or reversal of the reuptake transporters. It may also inhibit MAO enzymes leaving more neurotransmitter available at the synapse.Phentermine (through catecholamine elevation) may also indirectly affect leptin levels in the brain. It is theorized that phentermine can raise levels of leptin which signal satiety. It is also theorized that increased levels of the catecholamines are partially responsible for halting another chemical messenger known as neuropeptide Y. This peptide initiates eating, decreases energy expenditure, and increases fat storage.
PG(i-12:0/i-12:0) is a phosphatidylglycerol - a glycerophospholipid in which a phosphoglycerol moiety occupies a glycerol substitution site. As is the case with diacylglycerols, phosphatidylglycerols can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PG(i-12:0/i-12:0), in particular, consists of one chain of isododecanoic acid at the C-1 position and one chain of isododecanoic acid at the C-2 position. Phosphatidylglycerol is present at a level of 1-2% in most animal tissues, but it can be the second most abundant phospholipid in lung surfactant (up to 11% of the total). It is well established that the concentration of phosphatidylglycerol increases during fetal development. Phosphatidylglycerol may be present in animal tissues merely as a precursor for cardiolipin synthesis.
Phendimetrazine is a weight loss medication. Phendimetrazine is chemically related to amphetamines and is a Schedule III drug under the Convention on Psychotropic Substances. In the United States, phendimetrazine is a Schedule III controlled substance under the Uniform Controlled Substances Act of 1970.
4-Ketocyclophosphamide is a metabolite of cyclophosphamide. Cyclophosphamide (trade names Endoxan, Cytoxan, Neosar, Procytox, Revimmune), also known as cytophosphane, is a nitrogen mustard alkylating agent, from the oxazophorines group. An alkylating agent adds an alkyl group (CnH2n+1) to DNA. It attaches the alkyl group to the guanine base of DNA, at the number 7 nitrogen atom of the imidazole ring. It is used to treat various types of cancer and some autoimmune disorders. (Wikipedia)
4-Methylthiazole, also known as fema 3716, belongs to the class of organic compounds known as thiazoles. These are heterocyclic compounds containing a five-member aromatic ring made up of one sulfur atom, one nitrogen, and three carbon atoms. 4-Methylthiazole is a green, nutty, and roasted meat tasting compound. 4-methylthiazole has been detected, but not quantified, in several different foods, such as cereals and cereal products, coffee and coffee products, crustaceans, green vegetables, and nuts. This could make 4-methylthiazole a potential biomarker for the consumption of these foods. 4-Methylthiazole has been linked to the inborn metabolic disorders including celiac disease. A 1,3-thiazole substituted by a methyl group at position 4.
E-10-Hydroxydesmethylnortriptyline is only found in individuals that have used or taken Amitriptyline. E-10-Hydroxydesmethylnortriptyline is a metabolite of Amitriptyline. E-10-hydroxydesmethylnortriptyline belongs to the family of Dibenzocycloheptenes. These are compounds containing a dibenzocycloheptene moiety, which consists of two benzene connected by a cycloheptene ring.
E-10-Hydroxynortriptyline is only found in individuals that have used or taken Amitriptyline. E-10-Hydroxynortriptyline is a metabolite of Amitriptyline. E-10-hydroxynortriptyline belongs to the family of Dibenzocycloheptenes. These are compounds containing a dibenzocycloheptene moiety, which consists of two benzene connected by a cycloheptene ring.
N-Desmethyldoxepin is a metabolite of doxepin. Doxepin is a psychotropic agent with tricyclic antidepressant and anxiolytic properties, known under many brand-names such as Aponal, the original preparation by Boehringer-Mannheim, now part of the Roche group; Adapine, Doxal, Deptran, Sinquan and Sinequan. As doxepin hydrochloride, it is the active ingredient in cream-based preparations (Zonalon and Xepin) for the treatment of dermatological itch. (Wikipedia)
Didesmethyl doxepin is a metabolite of doxepin. Doxepin is a psychotropic agent with tricyclic antidepressant and anxiolytic properties, known under many brand-names such as Aponal, the original preparation by Boehringer-Mannheim, now part of the Roche group; Adapine, Doxal, Deptran, Sinquan and Sinequan. As doxepin hydrochloride, it is the active ingredient in cream-based preparations (Zonalon and Xepin) for the treatment of dermatological itch. (Wikipedia)
Adenosine is a nucleoside that is composed of adenine and D-ribose. Adenosine or adenosine derivatives play many important biological roles in addition to being components of DNA and RNA. For instance, adenosine plays an important role in energy transfer as adenosine triphosphate (ATP) and adenosine diphosphate (ADP). It also plays a role in signal transduction as cyclic adenosine monophosphate (cAMP). Adenosine itself is both a neurotransmitter and potent vasodilator. When administered intravenously adenosine causes transient heart block in the AV node. Due to the effects of adenosine on AV node-dependent supraventricular tachycardia, adenosine is considered a class V antiarrhythmic agent. Overdoses of adenosine intake (as a drug) can lead to several side effects including chest pain, feeling faint, shortness of breath, and tingling of the senses. Serious side effects include a worsening dysrhythmia and low blood pressure. When present in sufficiently high levels, adenosine can act as an immunotoxin and a metabotoxin. An immunotoxin disrupts, limits the function, or destroys immune cells. A metabotoxin is an endogenous metabolite that causes adverse health effects at chronically high levels. Chronically high levels of adenosine are associated with adenosine deaminase deficiency. Adenosine is a precursor to deoxyadenosine, which is a precursor to dATP. A buildup of dATP in cells inhibits ribonucleotide reductase and prevents DNA synthesis, so cells are unable to divide. Since developing T cells and B cells are some of the most mitotically active cells, they are unable to divide and propagate to respond to immune challenges. High levels of deoxyadenosine also lead to an increase in S-adenosylhomocysteine, which is toxic to immature lymphocytes.
Rimantadine is only found in individuals that have used or taken this drug. It is an RNA synthesis inhibitor that is used as an antiviral agent in the prophylaxis and treatment of influenza. [PubChem]The mechanism of action of rimantadine is not fully understood. Rimantadine appears to exert its inhibitory effect early in the viral replicative cycle, possibly inhibiting the uncoating of the virus. Genetic studies suggest that a virus protein specified by the virion M2 gene plays an important role in the susceptibility of influenza A virus to inhibition by rimantadine.
Contact fungicide used against rice blast disease in Japan Blasticidin S is an antibiotic used to select transformed cells in genetic engineering. In short, DNA of interest is fused to DNA encoding a resistance gene, and then is transformed into cells. After allowing time for recovery and for cells to begin transcribing and translating their new DNA, blasticidin is added. Now only the cells that have the new DNA can grow
1-Methyl-2-propylbenzene is found in fats and oils. 1-Methyl-2-propylbenzene is found in cotton plant volatile
3b,15b,17a-Trihydroxy-pregnenone is a major 15 beta-hydroxylated metabolite unique to the human perinatal period. (PMID 8750436). The chemical synthesis of 15&#946;-hydroxylated steroids is for use in the (a) development of new immunoassay techniques for application to newborn screening programs and fetal well-being; (b) development of new anti-androgenic drugs; and (c) study of androgen/estrogen interaction in late pregnancy.
Chloropyramine is a first generation antihistamine drug approved in some Eastern European countries for the treatment of allergic conjunctivitis, allergic rhinitis, bronchial asthma, and other atopic (allergic) conditions. Related indications for clinical use include Quincke's edema, allergic reactions to insect bites, food and drug allergies, and anaphylactic shock.
Adenosine is a nucleoside that is composed of adenine and D-ribose. Adenosine or adenosine derivatives play many important biological roles in addition to being components of DNA and RNA. For instance, adenosine plays an important role in energy transfer as adenosine triphosphate (ATP) and adenosine diphosphate (ADP). It also plays a role in signal transduction as cyclic adenosine monophosphate (cAMP). Adenosine itself is both a neurotransmitter and potent vasodilator. When administered intravenously adenosine causes transient heart block in the AV node. Due to the effects of adenosine on AV node-dependent supraventricular tachycardia, adenosine is considered a class V antiarrhythmic agent. Overdoses of adenosine intake (as a drug) can lead to several side effects including chest pain, feeling faint, shortness of breath, and tingling of the senses. Serious side effects include a worsening dysrhythmia and low blood pressure. When present in sufficiently high levels, adenosine can act as an immunotoxin and a metabotoxin. An immunotoxin disrupts, limits the function, or destroys immune cells. A metabotoxin is an endogenous metabolite that causes adverse health effects at chronically high levels. Chronically high levels of adenosine are associated with adenosine deaminase deficiency. Adenosine is a precursor to deoxyadenosine, which is a precursor to dATP. A buildup of dATP in cells inhibits ribonucleotide reductase and prevents DNA synthesis, so cells are unable to divide. Since developing T cells and B cells are some of the most mitotically active cells, they are unable to divide and propagate to respond to immune challenges. High levels of deoxyadenosine also lead to an increase in S-adenosylhomocysteine, which is toxic to immature lymphocytes.
Dezocine is a partial opiate drug and is used for pain management. Dezocine is a very effective alternative to fentanyl when administered during outpatient laparoscopy, although is associated with an increased incidence of postoperative nausea.
Dezocine is a partial opiate drug and is used for pain management. Dezocine is a very effective alternative to fentanyl when administered during outpatient laparoscopy, although is associated with an increased incidence of postoperative nausea.
2-Hydroxyestradiol-3-methylether is a methoxylated derivative of 2-hydroxyestradiol. 2-hydroxy estrogen metabolites can be converted to anticarcinogenic methoxylated metabolites (2-methoxyestrone and 2-methoxyestradiol, 2-hydroxyestrone and 2-hydroxyestradiol 3-methyl ether) by catechol O-methyltransferase (PMID: 11172156). 2-hydroxyestradiol 3-methyl ether has been found in the urine of pregnant women (along with other 2-hydroxyestrogen ethers) although the amounts are generally small (less than 5 ug/24 hours). (PMID: 966757).
Aldosterone 18-glucuronide is a natural human metabolite of Aldosterone generated in the liver by UDP glucuonyltransferase. Glucuronidation is used to assist in the excretion of toxic substances, drugs or other substances that cannot be used as an energy source. Glucuronic acid is attached via a glycosidic bond to the substance, and the resulting glucuronide, which has a much higher water solubility than the original substance, is eventually excreted by the kidneys.
Gliquidone is an anti-diabetic drug in the sulfonylurea class. It is used in the treatment of diabetes mellitus type 2. It is an ATP-dependent K+ (KATP) channel blocker. This block causes a depolarization which leads to activation of voltage-dependent Ca channels and Ca2+ influx, and eventually increases insulin release.
Mezlocillin is only found in individuals that have used or taken this drug. It is a semisynthetic ampicillin-derived acylureido penicillin. It has been proposed for infections with certain anaerobes and may be useful in inner ear, bile, and CNS infections. [PubChem]By binding to specific penicillin-binding proteins (PBPs) located inside the bacterial cell wall, mezlocillin inhibits the third and last stage of bacterial cell wall synthesis. Cell lysis is then mediated by bacterial cell wall autolytic enzymes such as autolysins; it is possible that mezlocillin interferes with an autolysin inhibitor.
Carteolol is only found in individuals that have used or taken this drug. It is a beta-adrenergic antagonist used as an anti-arrhythmia agent, an anti-angina agent, an antihypertensive agent, and an antiglaucoma agent. [PubChem]The primary mechanism of the ocular hypotensive action of carteolol in reducing intraocular pressure is most likely a decrease in aqueous humor production. This process is initiated by the non-selective beta1 and beta2 adrenergic receptor blockade.
2-Pentanone, also known as ethyl acetone or fema 2842, belongs to the class of organic compounds known as ketones. These are organic compounds in which a carbonyl group is bonded to two carbon atoms R2C=O (neither R may be a hydrogen atom). Ketones that have one or more alpha-hydrogen atoms undergo keto-enol tautomerization, the tautomer being an enol.  2-Pentanone is a very hydrophobic molecule, practically insoluble in water, and relatively neutral. Thus, 2-pentanone is considered to be an oxygenated hydrocarbon lipid molecule. 2-Pentanone is a sweet, alcohol, and banana tasting compound. 2-Pentanone is found, on average, in the highest concentration within milk (cow). 2-Pentanone has also been detected, but not quantified, in several different foods, such as fats and oils, corns, apples, evergreen blackberries, and fruits. This could make 2-pentanone a potential biomarker for the consumption of these foods. 2-Pentanone, with regard to humans, has been found to be associated with several diseases such as ulcerative colitis, nonalcoholic fatty liver disease, and crohn's disease; 2-pentanone has also been linked to the inborn metabolic disorder celiac disease.
The major hormone derived from the thyroid gland. Thyroxine is synthesized via the iodination of tyrosines (monoiodotyrosine) and the coupling of iodotyrosines (diiodotyrosine) in the thyroglobulin. Thyroxine is released from thyroglobulin by proteolysis and secreted into the blood. Thyroxine is peripherally deiodinated to form triiodothyronine which exerts a broad spectrum of stimulatory effects on cell metabolism. [PubChem]
4-Trimethylammoniobutanoic acid, also known as gamma-butyrobetaine (GBB) or 3-dehydroxycarnitine, is a highly water-soluble derivative of gamma-aminobutyric acid (GABA). It is also a precursor of L-carnitine. It is a substrate of gamma butyrobetaine hydroxylase/dioxygenase (also known as BBOX) which catalyzes the formation of L-carnitine from gamma-butyrobetaine, the last step in the L-carnitine biosynthesis pathway. Carnitine is essential for the transport of activated fatty acids across the mitochondrial membrane during mitochondrial beta-oxidation. Numerous disorders have been described that lead to disturbances in energy production and in intermediary metabolism which are characterized by the production and excretion of unusual acylcarnitines. A mutation in the gene coding for carnitine-acylcarnitine translocase, or the OCTN2 transporter aetiologically, causes a carnitine deficiency that results in poor intestinal absorption of dietary L-carnitine, impaired reabsorption by the kidney, and increased urinary loss. Determination of the qualitative pattern of acylcarnitines can be of diagnostic and therapeutic importance. The betaine structure of carnitine requires special analytical procedures for recording. The ionic nature of L-carnitine causes a high water solubility which decreases with increasing chain length of the ester group in the acylcarnitines. Therefore, the distribution of L-carnitine and acylcarnitines in various organs is defined by their function and their physicochemical properties as well. High-performance liquid chromatography (HPLC) permits screening for free and total carnitine, as well as complete quantitative acylcarnitine determination, including the long-chain acylcarnitine profile (PMID: 17508264, Monatshefte fuer Chemie (2005), 136(8), 1279-1291., Int J Mass Spectrom. 1999;188:39-52.).
Carinol is found in beverages. Carinol is a constituent of roots of Carissa carandas (karanda)
2-Mercaptopropanoic acid is a flavouring ingredien
(R)-Dihydromaleimide is found in pulses. (R)-Dihydromaleimide is an alkaloid from the shoots of dwarf pea (Pisum sativum
3-[4-Hydroxy-3-(3-methyl-2-butenyl)phenyl]-2-propenal is found in citrus. 3-[4-Hydroxy-3-(3-methyl-2-butenyl)phenyl]-2-propenal is produced by injured peel of grapefruit (Citrus paradisi) and orange (Citrus sinensis).
8-Hydroxydesmethylclomipramine is a metabolite of clomipramine. Clomipramine (trademarked as Anafranil) is a tricyclic antidepressant (TCA). It was developed in the 1960s by the Swiss drug manufacturer Geigy (now known as Novartis) and has been in clinical use worldwide ever since. (Wikipedia)
Oleyl alcohol (also octadecenol or cis-9-octadecen-1-ol) is a non-ionic, unsaturated fatty alcohol. It is an emulsion stabilizer, antifoam agent, detergent, and release agent for food applications. Oleyl alcohol is found in fish oils and inedible beef fat. It belongs to the family of fatty alcohols. These are aliphatic alcohols consisting of a chain of 8 to 22 carbon atoms (do not have to bear a carboxylic acid group) (Wikipedia).
Ethyl vanillin isobutyrate is a flavouring ingredient.
1,1'-(Tetrahydro-6a-hydroxy-2,3a,5-trimethylfuro[2,3-d]-1,3-dioxole-2,5-diyl)bis-ethanone is used as a food additive [EAFUS] ("EAFUS: Everything Added to Food in the United States. [http://www.eafus.com/]")
Ceftazidime is only found in individuals that have used or taken this drug. It is a semisynthetic, broad-spectrum antibacterial derived from cephaloridine and used especially for Pseudomonas and other gram-negative infections in debilitated patients. [PubChem]The bactericidal activity of ceftazidime results from the inhibition of cell wall synthesis via affinity for penicillin-binding proteins (PBPs).
. Bicine is a general purpose buffer for biological research. Useful pH range is 7.6 - 9.0. Its applications include: tissue culture,phosphorylation and photophosphorylation, fixative transmission electron microscopy, protein synthesis and preventing binding to non-receptor materials. It is a degradation product of alkanolamine and alkylalkanolamine solutions.
Moracin L is found in fruits. Moracin L is produced by Morus alba (white mulberry) infected with Fusarium solani.
1,2 diaminopropane, also known as 1,2-Propanediamine or 1-Methylethylenediamine, is classified as a member of the monoalkylamines. Monoalkylamines are organic compounds containing an primary aliphatic amine group. 1,2 diaminopropane is considered to be a soluble (in water) and a very strong basic compound. 1,2 diaminopropane can be found in blood and urine.
Sibutramine (trade name Meridia in the USA, Reductil in Europe and other countries), usually as sibutramide hydrochloride monohydrate, is an orally administered agent for the treatment of obesity. It is a centrally acting stimulant chemically related to amphetamines. Sibutramine is classified as a Schedule IV controlled substance in the United States. In October 2010, Sibutramine was withdrawn from Canadian and U.S. markets due to concerns that the drug increases the risk of heart attack and stroke in patients with a history of heart disease.
Indolelactic acid (CAS: 1821-52-9) is a tryptophan metabolite found in human plasma, serum, and urine. Tryptophan is metabolized by two major pathways in humans, either through kynurenine or via a series of indoles, and some of its metabolites are known to be biologically active. Indolelactic acid is present in various amounts, significantly higher in umbilical fetal plasma than in maternal plasma in the protein-bound form (PMID 2361979, 1400722, 3597614, 11060358, 1400722). Indolelactic acid is also a microbial metabolite; urinary indole-3-lactate is produced by Clostridium sporogenes (PMID: 29168502).
A thioureylene antithyroid agent that inhibits the formation of thyroid hormones by interfering with the incorporation of iodine into tyrosyl residues of thyroglobulin. This is done by interfering with the oxidation of iodide ion and iodotyrosyl groups through inhibition of the peroxidase enzyme. [PubChem]
Ethotoin is a hydantoin derivative and anticonvulsant. Ethotoin exerts an antiepileptic effect without causing general central nervous system depression. The mechanism of action is probably very similar to that of phenytoin. The latter drug appears to stabilize rather than to raise the normal seizure threshold, and to prevent the spread of seizure activity rather than to abolish the primary focus of seizure discharges.
(±)-1,3-Octanediol is a preservative for foods and cosmetic
The major storage protein of sweet potato tubers Ipomoea batatas accounting for ca. 80% of total soluble protein. Possesses Trypsin inhibiting activity which may have a defense role against tuber damage. Sporamin is found in root vegetables.
2-Furoylglycine is an acyl glycine. Acyl glycines are normally minor metabolites of fatty acids. However, the excretion of certain acyl glycines is increased in several inborn errors of metabolism. In certain cases the measurement of these metabolites in body fluids can be used to diagnose disorders associated with mitochondrial fatty acid beta-oxidation. Acyl glycines are produced through the action of glycine N-acyltransferase (EC 2.3.1.13) which is an enzyme that catalyzes the chemical reaction:. acyl-CoA + glycine < -- > CoA + N-acylglycine. Dietary studies show that 2-Furoylglycine precursors are of exogenous origin. Most probably from furan derivatives found in food prepared by strong heating. This may explain the absence of 2-furoylglycine in urine of breastfed children (PMID 4630229). 2-Furoylglycine is also a microbial metabolite.
Aesculetin, also known as cichorigenin or cichoriin aglucon, belongs to the class of organic compounds known as 6,7-dihydroxycoumarins. These are coumarins bearing two hydroxyl groups at positions 6 and 7 of the coumarin skeleton, respectively. Aesculetin is found, on average, in the highest concentration within sherries. Aesculetin has also been detected, but not quantified, in several different foods, such as horseradish, carrots, dandelions, grape wines, and highbush blueberries. This could make aesculetin a potential biomarker for the consumption of these foods.
2,4-Di-tert-butylphenol, also known as 2,4-DTBP, belongs to the class of organic compounds known as phenylpropanes. These are organic compounds containing a phenylpropane moiety. 2,4-Di-tert-butylphenol is an extremely weak basic (essentially neutral) compound (based on its pKa). 2,4-Di-tert-butylphenol is a synthetic phenolic antioxidant (SPA). SPAs are a family of chemicals used widely in foods, polymers, and cosmetics as radical trapping agents to slow down degradation due to oxidation. Given their widespread use, human exposure is unavoidable and there is public concern regarding environmental contamination by these chemicals. 2,4-Di-tert-butylphenol was detected at extremely high concentrations in human urine (PMID: 31265952).
Threonyllysine is a dipeptide composed of threonine and lysine. It is an incomplete breakdown product of protein digestion or protein catabolism. Dipeptides are organic compounds containing a sequence of exactly two alpha-amino acids joined by a peptide bond. Some dipeptides are known to have physiological or cell-signalling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis.
Lysylproline is a dipeptide composed of lysine and proline. It is an incomplete breakdown product of protein digestion or protein catabolism. Dipeptides are organic compounds containing a sequence of exactly two alpha-amino acids joined by a peptide bond. Some dipeptides are known to have physiological or cell-signalling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis.
Arginylproline is a dipeptide composed of arginine and proline. It is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis.
Argatroban is a direct, selective thrombin inhibitor. The American College of Cardiologists (ACC) recommend using bivalirudin or argatroban in patients who have had, or at risk for, heparin induced thrombocytopenia (HIT) and are undergoing percutaneous coronary intervention. Argatroban is a non-heparin anticoagulant shown to both normalize platelet count in patients with HIT and prevent the formation of thrombi. Parental anticoagulants must be stopped and a baseline activated partial thromboplastin time must be obtained prior to administering argatroban.
3-Fucosyllactose is a milk oligosaccharide isolated in 1958 (PMID: 13546862), and that was also isolated for the first time from the urine of a blood group O, nonsecretor, woman during pregnancy and lactation in 1977 (PMID: 838696). Is resistant to enzymic hydrolysis in the gastrointestinal tract of the infant; it is postulated that they reach the large intestine where they serve as substrates for bacterial metabolism. (PMID 10837303).
Hydroxykynurenine is a free radical generator and a bioprecursor quinolinic acid which is a endogenous excitotoxin (PMID 16697652). It is a product of enzyme kynurenine 3-monooxygenase in the tryptophan catabolism pathway (Reactome http://www.reactome.org).
Chlorcyclizine is a first-generation piperazine H1-antihistamine.
Proflavine is only found in individuals that have used or taken this drug. It is a topical antiseptic used mainly in wound dressings. [PubChem]Proflavine acts by interchelating DNA (intercalation), thereby disrupting DNA synthesis and leading to high levels of mutation in the copied DNA strands. This prevents bacterial reproduction.
3-Hydroxyquinine is a major metabolite of quinine. The formation of 3-hydroxyquinine is catalysed by cytochrome P450 3A4.
Leukotriene A4 (LTA4) is the first metabolite in the series of reactions leading to the synthesis of all leukotrienes. 5-Lipoxygenase (5-LO) catalyzes the two-step conversion of arachidonic acid to LTA4.The first step consists of the oxidation of arachidonic acid to the unstable intermediate 5-hydroperoxyeicosatetraenoic acid (5-HPETE), and the second step is the dehydration of 5-HPETE to form LTA4. Leukotriene A4, an unstable epoxide, is hydrolyzed to leukotriene B4 or conjugated with glutathione to yield leukotriene C4 and its metabolites, leukotriene D4 and leukotriene E4. The leukotrienes participate in host defense reactions and pathophysiological conditions such as immediate hypersensitivity and inflammation. Recent studies also suggest a neuroendocrine role for leukotriene C4 in luteinizing hormone secretion. (PMID: 10591081, 2820055). Leukotrienes are eicosanoids. The eicosanoids consist of the prostaglandins (PGs), thromboxanes (TXs), leukotrienes (LTs), and lipoxins (LXs). The PGs and TXs are collectively identified as prostanoids. Prostaglandins were originally shown to be synthesized in the prostate gland, thromboxanes from platelets (thrombocytes), and leukotrienes from leukocytes, hence the derivation of their names. All mammalian cells except erythrocytes synthesize eicosanoids. These molecules are extremely potent, able to cause profound physiological effects at very dilute concentrations. All eicosanoids function locally at the site of synthesis, through receptor-mediated G-protein linked signalling pathways.
N-Methylene-ethenamine belongs to the class of organic compounds known as imines. These are compounds containing an imine functional group, with the general structure RN=CR2 (R = H, hydrocarbyl).
Linalyl acetate, also known as 3,7-dimethylocta-1,6-dien-3-yl acetate, is a monoterpenoid that is the acetate ester of linalool. It forms a principal component of the essential oils from bergamot and lavender. It is an acetate ester and a monoterpenoid that derives from linalool. Linalyl acetate is isolated from numerous plants and essential oils, e.g. clary sage, lavender, lemon etc., and it is used as a flavouring ingredient. Synthetic linalyl acetate is sometimes used as an adulterant in essential oils to make them more marketable.
Sotalol is only found in individuals that have used or taken this drug. It is an adrenergic beta-antagonist that is used in the treatment of life-threatening arrhythmias (PubChem). Sotalol has both beta-adrenoreceptor blocking (Vaughan Williams Class I) and cardiac action potential duration prolongation (Vaughan Williams Class I) antiarrhythmic properties. Sotalol is a racemic mixture of d- and l-sotalol. Both isomers have similar Class I antiarrhythmic effects, while the l-isomer is responsible for virtually all of the beta-blocking activity. Sotalol inhibits response to adrenergic stimuli by competitively blocking &#946;<sub>1</sub>-adrenergic receptors within the myocardium and &#946;<sub>2</sub>-adrenergic receptors within bronchial and vascular smooth muscle. The electrophysiologic effects of sotalol may be due to its selective inhibition of the rapidly activating component of the potassium channel involved in the repolarization of cardiac cells. The class II electrophysiologic effects are caused by an increase in sinus cycle length (slowed heart rate), decreased AV nodal conduction, and increased AV nodal refractoriness, while the class III electrophysiological effects include prolongation of the atrial and ventricular monophasic action potentials, and effective refractory period prolongation of atrial muscle, ventricular muscle, and atrio-ventricular accessory pathways (where present) in both the anterograde and retrograde directions.
Betazole is only found in individuals that have used or taken this drug. It is a histamine H2 agonist used clinically to test gastric secretory function. [PubChem]Betazole is a histamine analogue. It produces the same effects as histamine, binding the H2 receptor which is a mediator of gastric acid secretion. This agonist action thereby results in an increase in the volume of gastric acid produced.
MG(0:0/20:4(5Z,8Z,11Z,14Z)/0:0), also known as 2-arachidonoylglycerol (2-AG), is a unique molecular species of monoacylglycerol isolated in 1995 from rat brain and canine gut as an endogenous ligand for the cannabinoid receptors. 2-AG is rapidly formed from arachidonic acid-containing phospholipids through increased phospholipid metabolism, such as enhanced inositol phospholipid turnover, in various tissues and cells upon stimulation. 2-AG binds to the cannabinoid receptors CB1 and CB2 and exhibits a variety of cannabimimetic activities in vitro and in vivo. 2-AG is an endogenous cannabinoid (endocannabinoid). Endocannabinoids are a class of fatty acid derivatives defined by their ability to interact with the specific cannabinoid receptors that were originally identified as the targets of delta9-tetrahydocannabinol (delta9-THC), the psychoactive component of cannabis. Endocannabinoids have been implicated in a growing number of important physiological and behavioral events. Endocannabinoids are amides, esters, and ethers of long-chain polyunsaturated fatty acids, which act as new lipidic mediators. 2-AG is one of the main endogenous agonists of cannabinoid receptors, able to mimic several pharmacological effects of delta9-THC, the active principle of Cannabis sativa preparations like hashish and marijuana. The activity of AEA and 2-AG at their receptors is limited by cellular uptake through an anandamide membrane transporter (AMT), followed by intracellular degradation. A fatty acid amide hydrolase (FAAH) is the main AEA hydrolase, whereas a monoacylglycerol lipase (MAGL) is critical in degrading 2-AG (PMID: 16515464, 16278487, 16678907).
11(R)-HETE is produced from arachidonic acid by both COX-1 and COX-2 (cyclooxygenases). Using a model of intestinal epithelial cells that express the COX-2 permanently, 11(R)-HETE is produced upon stimulation. However, 11(R)-HETE is not detected in intact cells. Endothelial cells release several factors which influence vascular tone, leukocyte function and platelet aggregation; 11(R)-HETE is one of these factors. (PMID: 15964853, 8555273).
Tyrosyl-Phenylalanine is a dipeptide composed of tyrosine and phenylalanine. It is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis. This dipeptide has not yet been identified in human tissues or biofluids and so it is classified as an 'Expected' metabolite.
5-Aminopentanamide is involved in the lysine degradation IV pathway. It can be generated from the enzymatic reduction of 5-aminopentanoate or enzymatic oxidation of L-lysine. Pseudomonas putida can catabolize L-lysine via the &#948;-aminovalerate (AMV) (5-aminopentanoate) pathway to glutarate. In this pathway, L-lysine is transported into the cell by basic amino acid transport systems. It is oxidatively decarboxylated to 5-aminopentanamide, which is then hydrolyzed to 5-aminopentanoate and ammonia. The conversion of 5-aminopentanoate to glutarate involves gene products of the davDT operon. Activation of glutarate to glutaryl-CoA by an as yet uncharacterized reaction(s) and further metabolism of glutaryl-CoA to carbon dioxide and acetyl-CoA have been demonstrated in Pseudomonas fluorescens.
lamotrigine-2-N-glucuronide is a metabolite of lamotrigine. Lamotrigine, marketed in the US and most of Europe as Lamictal by GlaxoSmithKline, is an anticonvulsant drug used in the treatment of epilepsy and bipolar disorder. It is also used as an adjunct in treating depression, though this is considered off-label usage. For epilepsy, it is used to treat focal seizures, primary and secondary tonic-clonic seizures, and seizures associated with Lennox-Gastaut syndrome. (Wikipedia)
Nitrofen is an herbicide of the diphenyl ether class. Because of concerns about its carcinogenicity, the use of nitrofen is banned in the European Union and in the United States.
(S)-Neolitsine is found in herbs and spices. (S)-Neolitsine is an alkaloid from the leaves of Laurus nobilis (bay laurel).
cis-4-Decenoic acid, also known as obtusilic acid, belongs to the class of organic compounds known as medium-chain fatty acids. These are fatty acids with an aliphatic tail that contains between 4 and 12 carbon atoms. cis-4-Decenoic acid is a very hydrophobic molecule, practically insoluble (in water), and relatively neutral. 4-Decenoic acid (and other intermediates of unsaturated fatty acid oxidation) has been found in increased amounts in liver, skeletal muscle, and heart obtained post mortem from patients with medium-chain acyl-CoA dehydrogenase deficiency (MCADD), multiple acyl-CoA dehydrogenase deficiency (MADD), and very-long-chain acyl-CoA dehydrogenase deficiency (VLCADD) (PMID: 11486898).
2-(4-Methyl-3-pentenyl)anthraquinone is found in fats and oils. 2-(4-Methyl-3-pentenyl)anthraquinone is isolated from the hairy root culture of Sesamum indicum (sesame).
Maltitol is a sugar alcohol (polyol) used as a sugar substitute. It has 90% the sweetness of sugar and nearly identical properties, except for browning. It is used to very easily replace sugar and has less food energy, does not promote tooth decay and has a somewhat lower blood sugar response. Unfortunately, maltitol is well known to cause gastric distress, particularly if consumed in great quantities. Chemically, maltitol is also known as 4-O-alpha-Glucopyranosyl-D-sorbitol. Commercially, it is known under trade names such as Maltisorb and Maltisweet. Due to its slow absorption, excessive consumption of Maltitol can have laxative effect and often can cause gas and/or bloating. Maltitol is particularly demonized regarding gastric side effects because it is so easy for food producers to use it in vast quantities (due to its amazingly sugar-like properties) so consumers often end up consuming far more than they could most other sugar alcohols. While this is a major problem with maltitol, many sugar alcohols are far more likely to cause gastric distress than maltitol when compared gram-for-gram.
Eicosapentaenoyl Ethanolamide (EPEA) is an endogenous fatty acid amide. EPEA is metabolized by fatty acid amide hydrolase (FAAH) and N-acylethanolamine-hydrolyzing acid amidase (NAAA), the latter of which has more specificity toward PEA over other fatty acid amides. DHEA and eicosapentaenoyl ethanolamide (EPEA) bind to the CB1 receptor in rat brains.23 DHA levels in the mouse brain have been shown to inversely affect the levels of 2AG.
Caproic acid, also known as hexanoic acid or C6:0, is a medium-chain fatty acid. Medium-chain fatty acids (MCFA) are fatty acids with aliphatic tails of 6 to 12 carbons, which can form medium-chain triglycerides. Caproic acid is a colourless oily liquid that smells like cheese with an overlying waxy or barnyard odor like that of goats or other barnyard animals. Its name comes from the Latin word capra, meaning "goat". Two other fatty acids are named after goats: caprylic acid (C8) and capric acid (C10). Along with caproic acid, they account for 15% of the fat in goat's milk. Caproic acid is a fatty acid found naturally in various animal fats and oils. While generally more abundant in animals, caproic acid is found in all organisms ranging from bacteria to plants to animals. Caproic acid is one of the chemicals that gives the decomposing fleshy seed coat of the ginkgo fruit its characteristic unpleasant odor. It is also one of the components of vanilla and cheese. Industrially, the primary use of caproic acid is in the manufacture of its esters for use as artificial flavors and in the manufacture of hexyl derivatives, such as hexylphenols. Caproic acid has been associated with medium chain acyl-CoA dehydrogenase deficiency, which is an inborn error of metabolism. As a relatively volatile organic compound, caproic acid has been identified as a fecal biomarker of Clostridium difficile infection (PMID: 30986230).
alpha-Hydroxymetoprolol is a metabolite of metoprolol. Metoprolol is a selective β1 receptor blocker used in treatment of several diseases of the cardiovascular system, especially hypertension. The active substance metoprolol is employed either as metoprolol succinate or metoprolol tartrate (where 100 mg metoprolol tartrate corresponds to 95 mg metoprolol succinate). The tartrate is an immediate-release and the succinate is an extended-release formulation. (Wikipedia)
Vesnarinone (INN) is a cardiotonic agent. A mixed phosphodiesterase 3 inhibitor and ion-channel modifier that has modest, dose-dependent, positive inotropic activity, but minimal negative chronotropic activity. Vesnarinone improves ventricular performance most in patients with the worst degree of heart failure.
17beta-Estradiol 3-glucuronide belongs to the class of organic compounds known as steroid glucuronide conjugates. These are sterol lipids containing a glucuronide moiety linked to the steroid skeleton. 17beta-Estradiol 3-glucuronide is a very hydrophobic molecule, practically insoluble (in water), and relatively neutral. Estradiol glucuronide is believed to play an important role in the mechanism of 17beta-estradiol(E2)-mediated tumour formation. Conjugation with glucuronic acid lowers tissue levels by facilitating excretion. Heterotropic activation by daidzein appears to be specific for the glucuronidation of E2 because daidzein did not affect the glucuronidation of the 2- and 4-hydroxy metabolites of E2 (PMID: 16598814).
Cofactor of phenylalanine and tyrosine hydroxylase (S-form) (Combined Chemical Dictionary).
Tyramine is a monoamine compound derived from the amino acid tyrosine. Tyramine is metabolized by the enzyme monoamine oxidase. In foods, it is often produced by the decarboxylation of tyrosine during fermentation or decay. Foods containing considerable amounts of tyramine include fish, chocolate, alcoholic beverages, cheese, soy sauce, sauerkraut, and processed meat. A large dietary intake of tyramine can cause an increase in systolic blood pressure of 30 mmHg or more. Tyramine acts as a neurotransmitter via a G protein-coupled receptor with high affinity for tyramine called TA1. The TA1 receptor is found in the brain as well as peripheral tissues including the kidney. An indirect sympathomimetic, Tyramine can also serve as a substrate for adrenergic uptake systems and monoamine oxidase so it prolongs the actions of adrenergic transmitters. It also provokes transmitter release from adrenergic terminals. Tyramine is a biomarker for the consumption of cheese
Propellant and aerating agent in foamed or sprayed food products Octafluorocyclobutane is a dimer of tetrafluoroethylene. Its critical point is at 115.3 ¬∞C and 2.79 MPa. Octafluorocyclobutane, or perfluorocyclobutane, C4F8, is a compound of carbon and fluorine used in the production and processing of semiconductor materials and devices, for example as a deposition gas and etchant. It has also been investigated as a refrigerant in specialised applications, as a replacement for Ozone depleting chlorofluorocarbon refrigerants
Pregnanetriolone belongs to the family of Sesterterpenes. These are terpenes compsed of five consecutive isoprene units.
Urolithin A is a secondary metabolite of ellagic acid which may be glucuronidated by liver enzymes during phase II metabolism.
y-Morphine is an alkaloid from opium poppies and opiu
3-beta-Hydroxy-4-beta-methyl-5-alpha-cholest-7-ene-4-alpha-carboxylate is a steroid biosynthesis intermediate. It is a substrate for sterol-4-alpha-carboxylate 3-dehydrogenase (EC 1.1.1.170) and participates in the following reaction: 3beta-hydroxy-4beta-methyl-5alpha-cholest-7-ene-4alpha-carboxylate + NAD(P)+ = 4alpha-methyl-5alpha-cholest-7-en-3-one + CO2 + NAD(P)H. It is also produced by methylsterol hydroxylase. It participates in the following reaction: 3beta-hydroxy-4beta-methyl-5alpha-cholest-7-ene-4alpha-carbaldehyde + NAD(P)H + H+ + O2 = 3beta-hydroxy-4beta-methyl-5alpha-cholest-7-ene-4alpha-carboxylate + NAD(P)+ + H2O.
Behenate, also known as docosanoate or behenic acid, is a member of the class of compounds known as very long-chain fatty acids. Very long-chain fatty acids are fatty acids with an aliphatic tail that contains at least 22 carbon atoms. Behenate is practically insoluble (in water) and a weakly acidic compound (based on its pKa). Behenate can be found in a number of food items such as winter savory, chinese broccoli, radish, and globe artichoke, which makes behenate a potential biomarker for the consumption of these food products. Behenic acid (also docosanoic acid) is a carboxylic acid, the saturated fatty acid with formula C21H43COOH. In appearance, it consists of white to cream color crystals or powder with a melting point of 80 ¬∞C and boiling point of 306 ¬∞C .
O-Desmethylnaproxen is only found in individuals that have used or taken Naproxen. O-Desmethylnaproxen is a metabolite of Naproxen. O-desmethylnaproxen belongs to the family of Phenylacetic Acid Derivatives. These are compounds containing a phenylacetic acid moiety, which consists of a phenyl group substituted at the second position by an acetic acid.
Arginyltyrosine is a dipeptide composed of arginine and tyrosine. It is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis.
3,4-dimethoxybenzoic acid belongs to the family of M-methoxybenzoic Acids and Derivatives. These are benzoic acids  in which the hydrogen atom at position 3 of the benzene ring is replaced by a methoxy group
Clomifene is only found in individuals that have used or taken this drug. It is a triphenyl ethylene stilbene derivative which is an estrogen agonist or antagonist depending on the target tissue. [PubChem]Clomifene has both estrogenic and anti-estrogenic properties, but its precise mechanism of action has not been determined. Clomifene appears to stumulate the release of gonadotropins, follicle-stimulating hormone (FSH), and leuteinizing hormone (LH), which leads to the development and maturation of ovarian follicle, ovulation, and subsequent development and function of the coprus luteum, thus resulting in pregnancy. Gonadotropin release may result from direct stimulation of the hypothalamic-pituitary axis or from a decreased inhibitory influence of estrogens on the hypothalamic-pituitary axis by competing with the endogenous estrogens of the uterus, pituitary, or hypothalamus. Clomifene has no apparent progestational, androgenic, or antrandrogenic effects and does not appear to interfere with pituitary-adrenal or pituitary-thyroid function.
Triflupromazine is only found in individuals that have used or taken this drug. It is a phenothiazine used as an antipsychotic agent and as an antiemetic. [PubChem]Triflupromazine binds to the dopamine D1 and dopamine D2 receptors and inhibits their activity. The mechanism of the anti-emetic effect is due predominantly to blockage of the dopamine D2 neurotransmitter receptors in the chemoreceptor trigger zone (CTZ) and vomiting centre. Triflupromazine blocks the neurotransmitter dopamine and the vagus nerve in the gastrointestinal tract. Triflupromazine also binds the muscarinic acetylcholine receptors (M1 and M2) and the tryptamine D receptors (5HT<sub>2B</sub>).
24,25-Dihydroxyvitamin D (24R,25(OH)2D3) circulates in blood at concentrations about 1000 times higher than 1alpha,25(OH)2D3. 24-Hydroxylase is present in the proximal convoluted tubule cells of the kidney and in virtual all target cells of 1alpha,25(OH)2D3. Interestingly, 1alpha,25(OH)2D3 is a very strong inducer of 24-hydroxylase activity and 24R,25(OH)2D3 formation. Also parathyroid hormone (PTH) regulates 24-hydroxylase activity but in a tissue specific manner, i.e. inhibitory in the kidney while a synergistic effect together with 1alpha,25(OH)2D3 is observed in osteoblasts. Generally, 24-hydroxylation has been considered the first step in the degradation pathway of 1alpha,25(OH)2D3 and 25-(OH)D3. However, through the past decades data have accumulated that 24R,25(OH)2D3 is not merely a degradation product but has effects on its own. Classic studies have demonstrated the significance of 24R,25(OH)2D3 for normal chicken egg hatchability and calcium and phosphorus homeostasis. More recently it became apparent that 24R,25(OH)2D3 also has distinct effects on cartilage in particular the resting zone cells. 24R,25(OH)2D3 stimulates osteocalcin synthesis in human osteoblasts. 24R,25(OH)2D3 plays a role in bone metabolism but that it acts in concert with 1alpha,25(OH)2D3 to obtain an optimal effect. (PMID: 11179746).
Thiothixene is only found in individuals that have used or taken this drug. It is a thioxanthine used as an antipsychotic agent. Its effects are similar to the phenothiazine antipsychotics. [PubChem]Thiothixene acts as an antagonist (blocking agent) on different postsysnaptic receptors -on dopaminergic-receptors (subtypes D1, D2, D3 and D4 - different antipsychotic properties on productive and unproductive symptoms), on serotonergic-receptors (5-HT1 and 5-HT2, with anxiolytic, antidepressive and antiaggressive properties as well as an attenuation of extrapypramidal side-effects, but also leading to weight gain, fall in blood pressure, sedation and ejaculation difficulties), on histaminergic-receptors (H1-receptors, sedation, antiemesis, vertigo, fall in blood pressure and weight gain), alpha1/alpha2-receptors (antisympathomimetic properties, lowering of blood pressure, reflex tachycardia, vertigo, sedation, hypersalivation and incontinence as well as sexual dysfunction, but may also attenuate pseudoparkinsonism - controversial) and finally on muscarinic (cholinergic) M1/M2-receptors (causing anticholinergic symptoms like dry mouth, blurred vision, obstipation, difficulty/inability to urinate, sinus tachycardia, ECG-changes and loss of memory, but the anticholinergic action may attenuate extrapyramidal side-effects).
2-Hydroxyestradiol-3-methylether is a methoxylated derivative of 2-hydroxyestradiol. 2-hydroxy estrogen metabolites can be converted to anticarcinogenic methoxylated metabolites (2-methoxyestrone and 2-methoxyestradiol, 2-hydroxyestrone and 2-hydroxyestradiol 3-methyl ether) by catechol O-methyltransferase (PMID: 11172156). 2-hydroxyestradiol 3-methyl ether has been found in the urine of pregnant women (along with other 2-hydroxyestrogen ethers) although the amounts are generally small (less than 5 ug/24 hours). (PMID: 966757).
L-L-Homoglutathione is found in pulses. L-L-Homoglutathione occurs in seeds of various legume
Metiamide belongs to the class of organic compounds known as imidazoles. These are compounds containing an imidazole ring, which is an aromatic five-member ring with two nitrogen atoms at positions 1 and 3, and three carbon atoms.
Halazepam is a benzodiazepine derivative. It possesses anxiolytic, anticonvulsant, sedative and skeletal muscle relaxant properties. It is a trifluoromethyl derivative of nordazepam. While its structure may be similar to chlordiazepoxide and diazepam, it has both less toxicity and less tendency to cause paradoxical hostility and aggression than either of them. [Wikipedia]
Dihydrothymine (CAS: 696-04-8) is an intermediate breakdown product of thymine. Dihydropyrimidine dehydrogenase catalyzes the reduction of thymine into 5,6-dihydrothymine; then dihydropyrimidinase hydrolyzes 5,6-dihydrothymine into N-carbamyl-beta-alanine. Finally, beta-ureidopropionase catalyzes the conversion of N-carbamyl-beta-alanine into beta-alanine. When present at abnormally high levels, dihydrothymine can be toxic, although the mechanism of toxicity is not clear. In particular, patients with dihydropyrimidinase deficiency exhibit highly increased concentrations of 5,6-dihydrouracil and 5,6-dihydrothymine; and moderately increased concentrations of uracil and thymine can be detected in urine. Dihydropyrimidinase deficiency is a disorder that can cause neurological and gastrointestinal problems in some affected individuals. The most common neurological abnormalities that occur are intellectual disability, seizures, weak muscle tone (hypotonia), abnormally small head size (microcephaly), and autistic behaviours that affect communication and social interaction. Gastrointestinal problems that occur in dihydropyrimidinase deficiency include the backflow of acidic stomach contents into the esophagus (gastroesophageal reflux) and recurrent episodes of vomiting.
Endoxifen (EDX) is a key active metabolite of tamoxifen (TAM) with higher affinity and specificity to estrogen receptors that also inhibits aromatase activity. (PMID: 23274567) Tamoxifen is an antagonist of the estrogen receptor in breast tissue via its active metabolite, hydroxytamoxifen. In other tissues such as the endometrium, it behaves as an agonist, and thus may be characterized as a mixed agonist/antagonist. Tamoxifen is the usual endocrine therapy for hormone receptor-positive breast cancer in pre-menopausal women, and is also a standard in post-menopausal women although aromatase inhibitors are also frequently used in that setting. (Wikipedia) The pharmacological activity of Tamoxifen is dependent on its conversion to its active metabolite, endoxifen, by CYP2D6. (PMID: 23711794) Tamoxifen is a largely inactive pro-drug, requiring metabolism into its most important metabolite endoxifen. Since the cytochrome P450 (CYP) 2D6 enzyme is primarily involved in this metabolism, genetic polymorphisms of this enzyme, but also drug-induced CYP2D6 inhibition can result in considerably reduced endoxifen formation and as a consequence may affect the efficacy of tamoxifen treatment. (PMID: 23760858)
Phenol-formaldehyde, cross-linked, tetraethylenepentamine activated is used as a food additive [EAFUS] ("EAFUS: Everything Added to Food in the United States. [http://www.eafus.com/]")
Retinoyl coenzyme A is an intermediate in vitamin A metabolism. The formation of retinoyl-CoA from retinoic acid, as the first step of retinoylation (acylation of proteins by retinoic acid in cells), required ATP, CoA and MgCl2.
Pyroglutamylglycine belongs to the class of organic compounds known as alpha amino acids. These are amino acids in which the amino group is attached to the carbon atom immediately adjacent to the carboxylate group (alpha carbon).
Lithocholyltaurine is a bile salt formed in the liver from lithocholic acid conjugation with taurine, usually as the sodium salt. It solubilizes fats for absorption and is itself absorbed. Lithocholic acid, a hydrophobic secondary bile acid, is well known to cause intrahepatic cholestasis. There have been extensive studies on the mechanisms of lithocholate-induced cholestasis in animals. Lithocholate diminishes both the bile acid-dependent and independent bile flow. In humans, elevated levels of lithocholic acid are found in patients with chronic cholestatic liver disease. Lithocholyltaurine impairs both the bile canalicular contractions and the canalicular bile secretion, possibly by acting directly on the canalicular membranes in lithocholyltaurine-induced cholestasis. Lithocholyltaurine induce acute cholestasis-associated with retrieval of the bile salt export pump. The bile salt export pump (BSEP) of hepatocyte secretes conjugated bile salts across the canalicular membrane in an ATP-dependent manner. Hepatic retention of bile acids may lead to liver injury by hepatocyte apoptosis and eventually deterioration of cholestatic liver diseases. One mechanism of induced apoptosis by lithocholyltaurine is the induction of transcriptional activity of AP-1 (activation protein-1). (PMID: 16981261, 15763547, 16332456, 18164257).
Permethrin is only found in individuals that have used or taken this drug. It is a pyrethroid insecticide commonly used in the treatment of lice infestations and scabies. It is a yellow to light orange-brown, low melt-ing solid or viscous liquid.Permethrin acts on the nerve cell membrane to disrupt the sodium channel current by which the polarization of the membrane is regulated. Delayed repolarization and paralysis of the pests are the consequences of this disturbance.
Demethoxyegonol is found in mushrooms. Demethoxyegonol is produced by Laetiporus sulphureus var. miniatu
2-Ethoxy-3-methylpyrazine is a flavouring ingredient with roast chocolate flavour. 2-Ethoxy-3-methylpyrazine is a component of *FEMA 3569*, a mixture with its regioisomer
2-Methylglutaric acid, also known as alpha-methylglutarate or 2-methylpentanedioate, belongs to the class of organic compounds known as methyl-branched fatty acids. These are fatty acids with an acyl chain that has a methyl branch. Usually, they are saturated and contain only one or more methyl group. However, branches other than methyl may be present. 2-Methylglutaric acid is also classified as an alpha,omega-dicarboxylic acid. It is glutaric acid substituted at position 2 by a methyl group. 2-Methylglutaric acid arises from the microbial metabolism of the isoprenoid alkaloid pristane (PMID: 4327007; PMID: 20143352).
Nicorette is a branded over-the-counter palliative treatment which is used to ameliorate the withdrawal effects involved in quitting smoking. Originally available as a patch for topical application, it was later made available as a nicotine gum (composed of nicotine polacrilex)lozenge, inhaler, and nasal spray. All these products contain nicotine as the active ingredient and work by delivering this into the bloodstream.
Eicosapentaenoic acid (EPA or also icosapentaenoic acid) is an important polyunsaturated fatty acid found in fish oils. It serves as the precursor for the prostaglandin-3 and thromboxane-3 families. A diet rich in eicosapentaenoic acid lowers serum lipid concentration, reduces incidence of cardiovascular disorders, prevents platelet aggregation, and inhibits arachidonic acid conversion into the thromboxane-2 and prostaglandin-2 families. Eicosapentaenoic acid is an omega-3 fatty acid. In physiological literature, it is given the name 20:5(n-3). Its systematic chemical name is all-cis-5,8,11,14,17-icosapentaenoic acid. It also has the trivial name timnodonic acid. Chemically, EPA is a carboxylic acid with a 20-carbon chain and five cis double bonds; the first double bond is located at the third carbon from the omega end. Because of the presence of double bonds, EPS is a polyunsaturated fatty acid. Metabolically it acts as a precursor for prostaglandin-3 (which inhibits platelet aggregation), thromboxane-3, and leukotriene-5 groups. It is found in fish oils of cod liver, herring, mackerel, salmon, menhaden, and sardine. It is also found in human breast milk (Wikipedia).
6-(2-amino-2-carboxyethyl)-4-hydroxybenzothiazole is considered to be practically insoluble (in water) and acidic
Fucose (CAS: 2438-80-4) is a hexose deoxy sugar with the chemical formula C6H12O5. L-Fucose (6-deoxy-L-galactose) is a monosaccharide that is a common component of many N- and O-linked glycans and glycolipids produced by mammalian cells. It is the fundamental subunit of the fucoidan polysaccharide. As a free sugar, L-fucose is normally found at very low levels in mammals. It is unique in that it is the only levorotatory sugar synthesized and utilized by mammals. Fucose polymers are synthesized by fucosyltransferases. All fucosyltransferases utilize a nucleotide-activated form of fucose, GDP-fucose, as a fucose donor in the construction of fucosylated oligosaccharides. The ABO blood group antigens are among the most well known fucosylated glycans. The alpha-1->3 linked core fucose is a suspected carbohydrate antigen for IgE-mediated allergy. Two structural features distinguish fucose from other six-carbon sugars present in mammals: the lack of a hydroxyl group on the carbon at the 6-position (C-6) and the L-configuration. In fucose-containing glycan structures, fucosylated glycans, fucose can exist as a terminal modification or serve as an attachment point for adding other sugars. Fucose is metabolized by an enzyme called alpha-fucosidase. Fucose is secreted in urine when the liver is damaged. Free L-fucose in serum and urine can be used as a marker for cancer, cirrhosis, alcoholic liver disease and gastric ulcers (PMID: 2311216, 8488966). Elevated levels of serum fucose have been reported in breast cancer, ovarian cancer, lung cancer, liver cancer, diabetes, and cardiovascular disease. It has been shown that feeding rats a diet high in L-fucose induces neuropathy similar to that seen in diabetics.
N-hydroxy-4-aminobiphenyl, also known as 4-Biphenylhydroxylamine, is classified as a biphenyl or a Biphenyl derivative. Biphenyls are organic compounds containing to benzene rings linked together by a C-C bond. N-hydroxy-4-aminobiphenyl is considered to be practically insoluble (in water) and relatively neutral
Nor-psi-tropine is found in fruits. Nor-psi-tropine is an alkaloid from the fruit of Morus alba (white mulberry
Hydroxynalidixic acid is a metabolite of nalidixic acid. Nalidixic acid (tradenames Nevigramon, Neggram, Wintomylon and WIN 18,320) is the first of the synthetic quinolone antibiotics. In the technical sense, it is a naphthyridone, not a quinolone: its ring structure is a 1,8-naphthyridine nucleus that contains two nitrogen atoms, unlike quinoline, which has a single nitrogen atom. (Wikipedia)
Diethyl oxalpropionate, also known as methyloxalacetic acid diethyl ester or diethyl methyloxalacetate, is a member of the class of compounds known as beta-keto acids and derivatives. These compounds are organic compounds containing an aldehyde substituted with a keto group on the C3 carbon atom. Diethyl oxalpropionate is slightly soluble (in water) and a very weakly acidic compound (based on its pKa). Within the cell, diethyl oxalpropionate is primarily located in the cytoplasm.
Galactaric acid, also known as mucic acid or galactarate, belongs to the class of organic compounds known as glucuronic acid derivatives. Glucuronic acid derivatives are compounds containing a glucuronic acid moiety (or a derivative), which consists of a glucose moiety with the C6 carbon oxidized to a carboxylic acid. Technically, galactaric acid is an aldaric acid obtained by oxidation of galactose. Galactaric acid exists as a white crystalline powder, which melts at 210 - 230 oC. It is insoluble in alcohol, and nearly insoluble in cold water (1 g/300 mL) but more soluble in hot water (1 g/60 mL).. Galactaric acid exists in all living organisms, ranging from bacteria to plants to humans. In plants, galactaric acid is commonly produced or utilized as an osmorgulator (PMID: 31505987). Galactaric acid has been detected, but not quantified in, several different foods, such as fruits, vegetables and bovine milk. A recent large-scale dietary study found that galactaric acid can serve as a biomarker for long-term dairy intake and for the consumption of carotenoid-rich vegetables (PMID: 33566801). In food production, galactaric acid can be used to replace tartaric acid in self-rising flour or fizzies.
7 alpha-hydroxylation is not directly involved, positively or negatively, in the action of 25- or 27-hydroxycholesterol as suppressors of HMG-CoA reductase activity. Human diploid fibroblasts (HDF) and the human melanoma cell line SK-MEL-2 converted 25-hydroxycholesterol into 7 alpha,25-dihydroxycholesterol and 7 alpha,25-dihydroxy-4-cholesten-3-one while the virus-transformed fibroblast line 90VA-VI, the colon carcinoma cell line WiDr and the breast cancer cell line MDA-231 did not express 7 alpha-hydroxylase activity. The 7 alpha-hydroxylation of 25-hydroxycholesterol in HDF could be stimulated by dexamethasone and cortisol and inhibited by metyrapone. An unidentified, possibly 4-hydroxylated, metabolite was formed by 90VA-VI cells and a polar, probably conjugated, metabolite was formed by WiDr cells. The 7 alpha-hydroxylated metabolites of 25-hydroxycholesterol suppressed the activity of HMG-CoA reductase to a similar extent as 25-hydroxycholesterol in HDF but not in 90VA-VI cells, while the 7 alpha-hydroxylated metabolites of 27-hydroxycholesterol suppressed the activity of HMG-CoA reductase also in 90VA-VI cells. (PMID: 9059514).
Acetohydroxamic Acid, a synthetic drug derived from hydroxylamine and ethyl acetate, is similar in structure to urea. In the urine, it acts as an antagonist of the bacterial enzyme urease. Acetohydroxamic Acid has no direct antimicrobial action and does not acidify urine directly. It is used, in addition to antibiotics or medical procedures, to treat chronic urea-splitting urinary infections.
3-phenoxybenzoic acid belongs to the family of Benzoic Acid and Derivatives. These are organic compounds containing a carboxylic acid substituent attached to a benzene ring.
4-Hydroxyphenylpyruvic acid (4-HPPA) is a keto acid that is involved in the tyrosine catabolism pathway. It is a product of the enzyme (R)-4-hydroxyphenyllactate dehydrogenase (EC 1.1.1.222) and is formed during tyrosine metabolism. The conversion from tyrosine to 4-HPPA is catalyzed by tyrosine aminotransferase. Additionally, 4-HPPA can be converted to homogentisic acid which is one of the precursors to ochronotic pigment. The enzyme 4-hydroxyphenylpyruvic acid dioxygenase (HPD) catalyzes the reaction that converts 4-hydroxyphenylpyruvic acid to homogentisic acid. A deficiency in the catalytic activity of HPD is known to lead to tyrosinemia type III, an autosomal recessive disorder characterized by elevated levels of blood tyrosine and massive excretion of tyrosine derivatives into urine. It has been shown that hawkinsinuria, an autosomal dominant disorder characterized by the excretion of 'hawkinsin,' may also be a result of HPD deficiency (PMID: 11073718). Moreover, 4-hydroxyphenylpyruvic acid is also found to be associated in phenylketonuria, which is also an inborn error of metabolism. There are two isomers of HPPA, specifically 4HPPA and 3HPPA, of which 4HPPA is the most common. 4-HPPA has been found to be a microbial metabolite in Escherichia (ECMDB).
A benzazepine derived from norbelladine. It is found in galanthus and other amaryllidaceae. Galantamine is a cholinesterase inhibitor that has been used to reverse the muscular effects of gallamine triethiodide and tubocurarine, and has been studied as a treatment for Alzheimer's disease and other central nervous system disorders. [PubChem]
Eicosapentaenoic acid (EPA or also icosapentaenoic acid) is an important polyunsaturated fatty acid found in fish oils. It serves as the precursor for the prostaglandin-3 and thromboxane-3 families. A diet rich in eicosapentaenoic acid lowers serum lipid concentration, reduces incidence of cardiovascular disorders, prevents platelet aggregation, and inhibits arachidonic acid conversion into the thromboxane-2 and prostaglandin-2 families. Eicosapentaenoic acid is an omega-3 fatty acid. In physiological literature, it is given the name 20:5(n-3). Its systematic chemical name is all-cis-5,8,11,14,17-icosapentaenoic acid. It also has the trivial name timnodonic acid. Chemically, EPA is a carboxylic acid with a 20-carbon chain and five cis double bonds; the first double bond is located at the third carbon from the omega end. Because of the presence of double bonds, EPS is a polyunsaturated fatty acid. Metabolically it acts as a precursor for prostaglandin-3 (which inhibits platelet aggregation), thromboxane-3, and leukotriene-5 groups. It is found in fish oils of cod liver, herring, mackerel, salmon, menhaden, and sardine. It is also found in human breast milk (Wikipedia).
Prednicarbate is a relatively new topical corticosteroid drug. It is similar in potency to hydrocortisone. It is used in the treatment of inflammatory skin diseases, such as atopic dermatitis. It has a favorable benefit-risk ratio, with an inflammatory action similar to that of a medium potency corticosteroid, but with a low potential to cause skin atrophy. The anti-inflammation action of corticosteroids is associated with the inhibition of the interleukin 1-alpha cytokine within keratinocytes. IL-1a is also found in fibroblasts, where it is responsible for proliferation, collagenase induction and IL-6 synthesis, which are related to skin thickness.
Isopropyl apiosylglucoside is found in root vegetables. Isopropyl apiosylglucoside is a constituent of the roots of cassava (Manihot esculenta).
Methyprylon is a sedative of the piperidinedione derivative family. This medicine was used for treating insomnia, but is now rarely used as it has been replaced by newer drugs with less side effects, such as benzodiazepines. Methyprylon was withdrawn from the US market in June 1965 and the Canadian market in September 1990. [Wikipedia]
beta-O-Methylynephrine is found in citrus. beta-O-Methylynephrine is obtained from tangerine leaves, poss. as artifact.
Glycyl-Phenylalanine is a dipeptide composed of glycine and phenylalanine. It is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis. This dipeptide has not yet been identified in human tissues or biofluids and so it is classified as an 'Expected' metabolite.
Methyl (9Z)-10'-oxo-6,10'-diapo-6-carotenoate is a constituent of Bixa orellana (annatto)
4-Deacetylneosolaniol is a mycotoxin produced by Fusarium heterosporu
T-2 Tetraol is a type-A trichothecene mycotoxin produced by different Fusarium species, including F. soprotrichioides, F. poae, and F. acuinatum that contaminate feedstuffs and cereal grains (PMID: 11843402, 31683661). T-2 Tetraol  shows the highest toxicity in animals compared to other trichothecenes. It contains a tetracyclic sesquiterpenoid 12,13-epoxytrichothec-9-ene ring which is responsible for the high toxicological activity (PMID: 12749813). In T-2 Tetraol, a carbonyl group at the C-8 position is substituted by an ester. T-2 Tetraol is resistant to light and temperature, but sensitive to strong acid or alkaline conditions. Some coexisting bacteria or fungi can detoxify T-2 Tetraol by altering its structure. It is associated with a wide range of effects in animals including weight loss, diarrhea, lethargy, low plasma glucose, decreases in blood cell and leukocyte count. damage to cartilaginous tissues, and induction of apoptosis (PMID: 21417259).
Sevoflurane is only found in individuals that have used or taken this drug. Sevoflurane (2,2,2-trifluoro-1-[trifluoromethyl]ethyl fluoromethyl ether), also called fluoromethyl, is a sweet-smelling, non-flammable, highly fluorinated methyl isopropyl ether used for induction and maintenance of general anesthesia. Together with desflurane, it is replacing isoflurane and halothane in modern anesthesiology. [Wikipedia]Sevoflurane induces a reduction in junctional conductance by decreasing gap junction channel opening times and increasing gap junction channel closing times. Sevoflurane also activates calcium dependent ATPase in the sarcoplasmic reticulum by increasing the fluidity of the lipid membrane. It also appears to bind the D subunit of ATP synthase and NADH dehydogenase and also binds to the GABA receptor, the large conductance Ca<sup>2+</sup> activated potassium channel, the glutamate receptor, and the glycine receptor.
Arginyllysine is a dipeptide composed of arginine and lysine. It is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis.
Thonzylamine is a first-generation ethylenediamine H1-antihistamine.
D-4-O-Methyl-myo-inositol is found in common pea. D-4-O-Methyl-myo-inositol is isolated from Vigna catjang and Medicago sativa (alfalfa
Ursocholic acid is a bile acid. Bile acids are steroid acids found predominantly in the bile of mammals. The distinction between different bile acids is minute, depending only on the presence or absence of hydroxyl groups on positions 3, 7, and 12. Bile acids are physiological detergents that facilitate excretion, absorption, and transport of fats and sterols in the intestine and liver. Bile acids are also steroidal amphipathic molecules derived from the catabolism of cholesterol. They modulate bile flow and lipid secretion, are essential for the absorption of dietary fats and vitamins, and have been implicated in the regulation of all the key enzymes involved in cholesterol homeostasis. Bile acids recirculate through the liver, bile ducts, small intestine and portal vein to form an enterohepatic circuit. They exist as anions at physiological pH and, consequently, require a carrier for transport across the membranes of the enterohepatic tissues. The unique detergent properties of bile acids are essential for the digestion and intestinal absorption of hydrophobic nutrients. Bile acids have potent toxic properties (e.g. membrane disruption) and there are a plethora of mechanisms to limit their accumulation in blood and tissues (PMID: 11316487, 16037564, 12576301, 11907135). Ursocholic acid is the 7 beta-hydroxyepimer of cholic acid. It induces a reduction of bile cholesterol saturation.
Pholcodine is a Schedule I drug in the US. It is also a class B substance in the United Kingdom although can be purchased over-the-counter in most UK pharmacies. Pholcodine is a drug which is an opioid cough suppressant (antitussive). It helps suppress unproductive coughs and also has a mild sedative effect, but has little or no analgesic effects. It is also known as morpholinylethylmorphine.
Dihydrofolic acid is a folic acid derivative acted upon by dihydrofolate reductase to produce tetrahydrofolic acid. It interacts with bacteria during cell division. It can be targeted with drug analogs to prevent nucleic acid synthesis. Dihydrofolic acid is also known by the name Dihydrofolate - more commonly Vitamin B9.
Histidyllysine is a dipeptide composed of histidine and lysine. It is an incomplete breakdown product of protein digestion or protein catabolism. Dipeptides are organic compounds containing a sequence of exactly two alpha-amino acids joined by a peptide bond. Some dipeptides are known to have physiological or cell-signalling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis.
Toremifene is only found in individuals that have used or taken this drug. It is a first generation nonsteroidal selective estrogen receptor modulator (SERM) that is structurally related to tamoxifen. Like tamoxifen, it is an estrogen agonist for bone tissue and cholesterol metabolism but is antagonistic on mammary and uterine tissue. [PubChem]Toremifene is a nonsteroidal triphenylethylene derivative. Toremifene binds to estrogen receptors and may exert estrogenic, antiestrogenic, or both activities, depending upon the duration of treatment, animal species, gender, target organ, or endpoint selected. The antitumor effect of toremifene in breast cancer is believed to be mainly due to its antiestrogenic effects, in other words, its ability to compete with estrogen for binding sites in the cancer, blocking the growth-stimulating effects of estrogen in the tumor. Toremifene may also inhibit tumor growth through other mechanisms, such as induction of apoptosis, regulation of oncogene expression, and growth factors.
An antihelminthic drug that has been tried experimentally in rheumatic disorders where it apparently restores the immune response by increasing macrophage chemotaxis and T-lymphocyte function. Paradoxically, this immune enhancement appears to be beneficial in rheumatoid arthritis where dermatitis, leukopenia, and thrombocytopenia, and nausea and vomiting have been reported as side effects. (From Smith and Reynard, Textbook of Pharmacology, 1991, p435-6)
Isradipine belongs to the dihydropyridine (DHP) class of calcium channel blockers (CCBs), the most widely used class of CCBs. It is structurally related to felodipine, nifedipine, and nimodipine and is the most potent calcium-channel blocking agent of the DHP class. Isradipine binds to calcium channels with high affinity and specificity and inhibits calcium flux into cardiac and arterial smooth muscle cells. It exhibits greater selectivity towards arterial smooth muscle cells owing to alternative splicing of the alpha-1 subunit of the channel and increased prevalence of inactive channels in smooth muscle cells. Isradipine may be used to treat mild to moderate essential hypertension.
2-Methylpentane belongs to the class of organic compounds known as branched alkanes. These are acyclic branched hydrocarbons having the general formula CnH2n+2. 2-Methylpentane is possibly neutral. 2-Methylpentane is a potentially toxic compound. It causes degeneration of the peripheral nervous system (and eventually the central nervous system), starting with damage to the nerve axons. It is distributed throughout the body in the blood, and metabolized by mixed function oxidases in the liver to a number of metabolites.
3-Methylpentane belongs to the class of organic compounds known as branched alkanes. These are acyclic branched hydrocarbons having the general formula CnH2n+2. These solvents are also used as cleaning agents in the printing, textile, furniture, and shoemaking industries. Breathing large amounts of hexane causes numbness in the feet and hands, followed by muscle weakness in the feet and lower legs. 3-Methylpentane is possibly neutral. 3-Methylpentane is a potentially toxic compound. Inhalation of high concentrations produces first a state of mild euphoria, followed by somnolence with headaches and nausea.
Heme is the color-furnishing portion of hemoglobin. It is found free in tissues and as the prosthetic group in many hemeproteins. A heme or haem is a prosthetic group that consists of an iron atom contained in the center of a large heterocyclic organic ring called a porphyrin. Not all porphyrins contain iron, but a substantial fraction of porphyrin-containing metalloproteins have heme as their prosthetic subunit; these are known as hemoproteins.
Ethanethioic acid is used as a food additive [EAFUS] ("EAFUS: Everything Added to Food in the United States. [http://www.eafus.com/]")
Plastoquinone is a member of the class of compounds known as prenylquinones. Prenylquinones are quinones with a structure characterized by the quinone ring substituted by an prenyl side-chain. Plastoquinone is practically insoluble (in water) and an extremely weak basic (essentially neutral) compound (based on its pKa). Plastoquinone can be found in barley, which makes plastoquinone a potential biomarker for the consumption of this food product. Plastoquinone (PQ) is an isoprenoid quinone molecule involved in the electron transport chain in the light-dependent reactions of photosynthesis. The most common form of plastoquinone, known as PQ-A or PQ-9, is a 2,3-dimethyl-1,4-benzoquinone molecule with a side chain of nine isoprenyl units. There are other forms of plastoquinone, such as ones with shorter side chains like PQ-3 (which has 3 isoprenyl side units instead of 9) as well as analogs such as PQ-B, PQ-C, and PQ-D, which differ in their side chains. The benzoquinone and isoprenyl units are both nonpolar, anchoring the molecule within the inner section of a lipid bilayer, where the hydrophobic tails are usually found .
Porson is found in herbs and spices. Porson belongs to the family of Methoxyphenols and Derivatives. These are compounds containing a methoxy group attached to the benzene ring of a phenol moiety.
Quercetin is a flavonoid widely distributed in many plants and fruits including red grapes, citrus fruit, tomato, broccoli and other leafy green vegetables, and a number of berries, including raspberries and cranberries. Quercetin itself (aglycone quercetin), as opposed to quercetin glycosides, is not a normal dietary component. Quercetin glycosides are converted to phenolic acids as they pass through the gastrointestinal tract. Quercetin has neither been confirmed scientifically as a specific therapeutic for any condition nor been approved by any regulatory agency. The U.S. Food and Drug Administration has not approved any health claims for quercetin. Nevertheless, the interest in dietary flavonoids has grown after the publication of several epidemiological studies showing an inverse correlation between dietary consumption of flavonols and flavones and reduced incidence and mortality from cardiovascular disease and cancer. In recent years, a large amount of experimental and some clinical data have accumulated regarding the effects of flavonoids on the endothelium under physiological and pathological conditions. The meta-analysis of seven prospective cohort studies concluded that the individuals in the top third of dietary flavonol intake are associated with a reduced risk of mortality from coronary heart disease as compared with those in the bottom third, after adjustment for known risk factors and other dietary components. A limited number of intervention studies with flavonoids and flavonoid containing foods and extracts has been performed in several pathological conditions (PMID:17015250).
Capric acid, also known as decanoic acid is a C10 saturated fatty acid. It is a member of the series of fatty acids found in oils and animal fats. The names of caproic, caprylic, and capric acids are all derived from the word caper (Latin for goat). These fatty acids are light yellowish transparent oily liquids with a sweaty, unpleasant aroma that is reminiscent of goats. Capric acid is used in the manufacture of esters for artificial fruit flavors and perfumes. It is also used as an intermediate in chemical syntheses. Capric acid is used in organic synthesis and industrially in the manufacture of perfumes, lubricants, greases, rubber, dyes, plastics, food additives and pharmaceuticals. Capric acid occurs naturally in coconut oil (about 10%) and palm kernel oil (about 4%), otherwise it is uncommon in typical seed oils. It is found in the milk of various mammals and to a lesser extent in other animal fats. Capric acid, caproic acid (a C6:0 fatty acid) and caprylic acid (a C8:0 fatty acid) account for about 15% of the fatty acids in goat milk fat (PMID 16747831). Capric acid may be responsible for the mitochondrial proliferation associated with the ketogenic diet, which may occur via PPARgamma receptor agonism and the targeting of genes involved in mitochondrial biogenesis (PMIDL 24383952).
Generally refers to the 17-beta-isomer of estradiol, an aromatized C18 steroid with hydroxyl group at 3-beta- and 17-beta-position. estradiol-17-beta is the most potent form of mammalian estrogenic steroids. In humans, it is produced primarily by the cyclic ovaries and the placenta. It is also produced by the adipose tissue of men and postmenopausal women. The 17-alpha-isomer of estradiol binds weakly to estrogen receptors (receptors, estrogen) and exhibits little estrogenic activity in estrogen-responsive tissues. Various isomers can be synthesized.
Glutamylhistidine is a dipeptide composed of glutamate and histidine, and is a proteolytic breakdown product of larger proteins. It belongs to the family of N-acyl-alpha amino acids and derivatives. These are compounds containing an alpha amino acid which bears an acyl group at its terminal nitrogen atom. Glutamylhistidine is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis.
5,8-Epoxy-5,8-dihydro-10'-apo-b,y-carotene-3,10'-diol is found in citrus. 5,8-Epoxy-5,8-dihydro-10'-apo-b,y-carotene-3,10'-diol is isolated from Persea americana (avocado) and from Valencia orange juice.
Tricosanoic acid, also known as N-tricosanoate or 22FA, belongs to the class of organic compounds known as very long-chain fatty acids. These are fatty acids with an aliphatic tail that contains at least 22 carbon atoms. Tricosanoic acid is a very hydrophobic molecule, practically insoluble in water, and relatively neutral. Tricosanoic acid is a potentially toxic compound.
7-Methylhypoxanthine is a methyl derivative of xanthine, found occasionally in human urine.
1-methylinosine is inosine carrying a methyl substituent at position 1 on the hypoxanthine ring. It has a role as a metabolite. It derives from an inosine. It is a modified nucleotide found at position 37 in tRNA 3' to the anticodon of eukaryotic tRNA. Shown that sequences are forced to adopt a hairpin conformation if one of the central 6 nt is replaced by the corresponding methylated nucleotide, such as 1-methylguanosine. In Vivo synthesis: Inosine-37 in tRNA is synthesised by a hydrolytic deamination-type reaction, catalysed by distinct tRNA:adenosine deaminases.
3-Hydroxy-2-methylbutanoic acid (HMBA) is a normal urinary metabolite involved in isoleucine catabolism, beta-oxidation of fatty acids, and ketogenesis. HMDB is excreted in abnormally high amounts in beta-ketothiolase deficiency. Differences in the enantiomeric ratio of HMBA may originate from the enantioselectivity of different enzyme systems (PMID: 10755375).
4-Androsten-3beta,17beta-diol 3-sulfate, also known as androstenediol 3-sulfate, is classified as a member of the sulfated steroids. Sulfated steroids are sterol lipids containing a sulfate group attached to the steroid skeleton. 4-Androsten-3beta,17beta-diol monosulfate was found to be significantly (Bonferroni) associated with rheumatoid arthritis (PMID: 28831053).
N6-Carboxymethyllysine (CML), also known as epsilon-(carboxymethyl)lysine, belongs to the class of organic compounds known as L-alpha-amino acids. These are alpha-amino acids which have the L-configuration of the alpha-carbon atom. CML is a Maillard reaction product, or dietary advanced glycation end-products (d-AGE), formed as a result of the thermal treatment of foods. Due to its chemical stability and its ubiquity in foods and in vivo, CML is used as a biomarker for the ingestion of thermally treated foods. CML is metabolized by intestinal bacteria under anaerobic conditions (PMID: 31091091).
N-Acetyl-b-glucosaminylamine is the product of a reaction catalyzed vy the enzyme N(4)-(beta-N-acetylglucosaminyl)-L-asparaginase [EC 3.5.1.26, Aspartylglucosaminidase, AGA]. AGA is a key enzyme in the catabolism of N-linked oligosaccharides of glycoproteins. It cleaves the asparagine from the residual N-acetylglucosamines as one of the final steps in the lysosomal breakdown of glycoproteins. Aspartylglucosaminuria (AGU) is a lysosomal disease caused by deficiency of N-aspartyl-beta-glucosaminidase. AGU is the only known lysosomal storage disease caused by an amidase deficiency. (OMIM208400).
2-O-Caffeoylarbutin is found in fruits. 2-O-Caffeoylarbutin is isolated from leaves of Vaccinium vitis-idaea (mountain cranberry
4-Hydroxytestosterone is the 17-hydroxylated analog to formestane. It is commercially available on the internet as anabolic steroid for oral self-administration and does not have any therapeutic indication. Hence, only little information is available about its metabolism. So far, most studies dealt with 4-hydroxytestosterone as metabolite of formestane while one study investigated the glucuronic acid conjugates of metabolic products of 4-hydroxytestosterone. This substance is prohibited in sports by the World Anti-Doping Agency; there is to a considerable increase of structurally related steroids with anabolic effects offered via the internet. 4-Hydroxytestosterone is a metabolite of the steroidal aromatase inhibitor 4-hydroxyandrost-4-ene-3,17-dione (4OHA). (PMID: 17724580, 17610244, 17207827, 1284430).
24-Hydroxycholesterol (24OHC) is almost exclusively formed in the brain. The enzymatic conversion of CNS cholesterol to 24OHC, which readily crosses the blood-brain barrier, is the major pathway for brain cholesterol elimination and brain cholesterol homeostasis maintenance. The enzyme mediating this conversion has been characterized at the molecular level as cholesterol 24-hydroxylase (EC 1.14.13.98, CYP46) and is mainly located in neurons. Like other oxysterols, 24OHC is efficiently converted into normal bile acids or excreted in bile in its sulfated and glucuronidated form. Levels of 24OHC in the circulation decrease with age in infants and children. In adults, however, the levels appear to be stable. There is accumulating evidence pointing toward a potentially important link between cholesterol, beta-amyloid, and Alzheimer's disease. Patients with active demyelinating diseases had increased levels of 24OHC in cerebrospinal fluid (CSF). Patients with Alzheimer's disease have slightly increased levels of 24OHC in CSF. Patients with multiple sclerosis have a tendency to have higher levels of 24OHC during active periods. (PMID: 15061359, 14574622). 24-Hydroxycholesterol has been found to accumulate in hereditary hypercholesterolemia, an inborn error of metabolism.
24-Hydroxycholesterol (24OHC) is almost exclusively formed in the brain. The enzymatic conversion of CNS cholesterol to 24OHC, which readily crosses the blood-brain barrier, is the major pathway for brain cholesterol elimination and brain cholesterol homeostasis maintenance. The enzyme mediating this conversion has been characterized at the molecular level as cholesterol 24-hydroxylase (EC 1.14.13.98, CYP46) and is mainly located in neurons. Like other oxysterols, 24OHC is efficiently converted into normal bile acids or excreted in bile in its sulfated and glucuronidated form. Levels of 24OHC in the circulation decrease with age in infants and children. In adults, however, the levels appear to be stable. There is accumulating evidence pointing toward a potentially important link between cholesterol, beta-amyloid, and Alzheimer's disease. Patients with active demyelinating diseases had increased levels of 24OHC in cerebrospinal fluid (CSF). Patients with Alzheimer's disease have slightly increased levels of 24OHC in CSF. Patients with multiple sclerosis have a tendency to have higher levels of 24OHC during active periods. (PMID: 15061359, 14574622). 24-Hydroxycholesterol has been found to accumulate in hereditary hypercholesterolemia, an inborn error of metabolism.
3b,12a-Dihydroxy-5a-cholanoic acid is a bile acid. Bile acids are steroid acids found predominantly in bile of mammals. The distinction between different bile acids is minute, depends only on presence or absence of hydroxyl groups on positions 3, 7, and 12. Bile acids are physiological detergents that facilitate excretion, absorption, and transport of fats and sterols in the intestine and liver. Bile acids are also steroidal amphipathic molecules derived from the catabolism of cholesterol. They modulate bile flow and lipid secretion, are essential for the absorption of dietary fats and vitamins, and have been implicated in the regulation of all the key enzymes involved in cholesterol homeostasis. Bile acids recirculate through the liver, bile ducts, small intestine and portal vein to form an enterohepatic circuit. They exist as anions at physiological pH and, consequently, require a carrier for transport across the membranes of the enterohepatic tissues. The unique detergent properties of bile acids are essential for the digestion and intestinal absorption of hydrophobic nutrients. Bile acids have potent toxic properties (e.g., membrane disruption) and there are a plethora of mechanisms to limit their accumulation in blood and tissues.
alpha-Muricholic acid is a hydroxylated bile acid present in normal human urine (PMID: 1629271), and in free glycine-conjugated, taurine-conjugated, and sulfated forms in human feces (PMID: 3667743). Bile acids are steroid acids found predominantly in the bile of mammals. The distinction between different bile acids is minute, depending only on the presence or absence of hydroxyl groups on positions 3, 7, and 12. Bile acids are physiological detergents that facilitate excretion, absorption, and transport of fats and sterols in the intestine and liver. Bile acids are also steroidal amphipathic molecules derived from the catabolism of cholesterol. They modulate bile flow and lipid secretion, are essential for the absorption of dietary fats and vitamins, and have been implicated in the regulation of all the key enzymes involved in cholesterol homeostasis. Bile acids recirculate through the liver, bile ducts, small intestine and portal vein to form an enterohepatic circuit. They exist as anions at physiological pH and, consequently, require a carrier for transport across the membranes of the enterohepatic tissues. The unique detergent properties of bile acids are essential for the digestion and intestinal absorption of hydrophobic nutrients. Bile acids have potent toxic properties (e.g. membrane disruption) and there are a plethora of mechanisms to limit their accumulation in blood and tissues (PMID: 11316487, 16037564, 12576301, 11907135).
Tauroursodeoxycholic acid is a bile acid also known as TUDCA formed in the liver by conjugation of deoxycholate with taurine, usually as the sodium salt. TUDCA is able to prevent apoptosis and protect mitochondria from cellular elements that would otherwise interfere with energy production. One of these elements is a protein called Bax. TUDCA plays an important role in preventing Bax from being transported to the mitochondria. Bile acids are steroid acids found predominantly in the bile of mammals. The distinction between different bile acids is minute, depending only on the presence or absence of hydroxyl groups on positions 3, 7, and 12. Bile acids are physiological detergents that facilitate excretion, absorption, and transport of fats and sterols in the intestine and liver. Bile acids are also steroidal amphipathic molecules derived from the catabolism of cholesterol. They modulate bile flow and lipid secretion, are essential for the absorption of dietary fats and vitamins, and have been implicated in the regulation of all the key enzymes involved in cholesterol homeostasis. Bile acids recirculate through the liver, bile ducts, small intestine and portal vein to form an enterohepatic circuit. They exist as anions at physiological pH and, consequently, require a carrier for transport across the membranes of the enterohepatic tissues. The unique detergent properties of bile acids are essential for the digestion and intestinal absorption of hydrophobic nutrients. Bile acids have potent toxic properties (e.g. membrane disruption) and there are a plethora of mechanisms to limit their accumulation in blood and tissues (PMID: 11316487, 16037564, 12576301, 11907135).
Lithocholyltaurine is a bile salt formed in the liver from lithocholic acid conjugation with taurine, usually as the sodium salt. It solubilizes fats for absorption and is itself absorbed. Lithocholic acid, a hydrophobic secondary bile acid, is well known to cause intrahepatic cholestasis. There have been extensive studies on the mechanisms of lithocholate-induced cholestasis in animals. Lithocholate diminishes both the bile acid-dependent and independent bile flow. In humans, elevated levels of lithocholic acid are found in patients with chronic cholestatic liver disease. Lithocholyltaurine impairs both the bile canalicular contractions and the canalicular bile secretion, possibly by acting directly on the canalicular membranes in lithocholyltaurine-induced cholestasis. Lithocholyltaurine induce acute cholestasis-associated with retrieval of the bile salt export pump. The bile salt export pump (BSEP) of hepatocyte secretes conjugated bile salts across the canalicular membrane in an ATP-dependent manner. Hepatic retention of bile acids may lead to liver injury by hepatocyte apoptosis and eventually deterioration of cholestatic liver diseases. One mechanism of induced apoptosis by lithocholyltaurine is the induction of transcriptional activity of AP-1 (activation protein-1). (PMID: 16981261, 15763547, 16332456, 18164257).
5-Bromotryptophan (CAS: 6548-09-0) belongs to the class of organic compounds known as indolyl carboxylic acids and derivatives. Indolyl carboxylic acids and derivatives are compounds containing a carboxylic acid chain (of at least 2 carbon atoms) linked to an indole ring. 5-Bromotryptophan has been identified in blood (PMID: 31396400).
2-Hydroxy-3-methylpentanoic acid or 2-hydroxy-3-methylvaleric acid (HMVA) is an organic acid generated by L-isoleucine metabolism. It is derived from the reduction of 2-Keto-3-methylvaleric acid (KMVA), possibly through the action of a lactate dehydrogenase (PMID: 1429566). There are 4 stereoisomers of HMVA (2S,3S-HMVA, 2R,3R-HMVA, 2S,3R-HMVA and 2R,3S-HMVA), of which the 2S,3S and 2S,3R derivatives are generally separable. HMVA is found in the urine and blood of normal individuals but in very elevated levels in patients with maple syrup urine disease (MSUD) (PMID: 1429566). Maple syrup urine disease (MSUD) is an inherited metabolic disease predominantly characterized by neurological dysfunction including psychomotor/delay/mental retardation.
(S)C(S)S-S-Methylcysteine sulfoxide is found in brassicas. (S)C(S)S-S-Methylcysteine sulfoxide is a constituent of onion (Allium cepa), other Allium species and Brassica species. Potential nutriceutical
N2-Acetylornithine, also known as N(alpha)-acetylornithine, belongs to the class of organic compounds known as N-acyl-L-alpha-amino acids. These are N-acylated alpha-amino acids which have the L-configuration of the alpha-carbon atom. N-Acetylornithine is a minor component of the deproteinized blood plasma of human blood. Human blood plasma contains a variable amount of acetylornithine, averaging 1.1 +/- 0.4 umol/L (range 0.8-0.2 umol/L). Urine contains a very small amount of acetylornithine, approximately 1 nmol/mg creatinine (1 umol/day) (PMID:508804).
N2-Acetylornithine, also known as N(alpha)-acetylornithine, belongs to the class of organic compounds known as N-acyl-L-alpha-amino acids. These are N-acylated alpha-amino acids which have the L-configuration of the alpha-carbon atom. N-Acetylornithine is a minor component of the deproteinized blood plasma of human blood. Human blood plasma contains a variable amount of acetylornithine, averaging 1.1 +/- 0.4 umol/L (range 0.8-0.2 umol/L). Urine contains a very small amount of acetylornithine, approximately 1 nmol/mg creatinine (1 umol/day) (PMID:508804).
N-alpha-Acetyl-L-citrulline, also known as N-acetylcitrulline, is an N-acetylated metabolite of citrulline that is part of the arginine biosynthetic pathway. Arginine biosynthesis is notable for its complexity and variability at the genetic level, and by its connection with several other pathways, such as pyrimidine and polyamine biosynthesis, and certain degradative pathways. The initial steps of the arginine biosynthetic pathways proceed via N-acetylated intermediates. The presumed reason for this is that the acetylation prevents the spontaneous cyclization of glutamate derivatives, which leads to proline biosynthesis. N-acetyl-L-ornithine can be transcarbamylated directly by the enzyme acetylornithine transcarbamylase, resulting in N-acetyl-L-citrulline. The enzyme acetylornithine deacetylase can accept N-acetyl-L-citrulline as a substrate and can deacetylate it into citrulline. N-alpha-Acetyl-L-citrulline is found in cases of deficiency of the urea cycle enzyme argininosuccinate synthase (EC 6.3.4.5) that leads to increased concentrations of citrulline and N-acetylcitrulline in the urine (PMID: 14633929).
gamma-Glutamylhistidine is a dipeptide composed of gamma-glutamate and histidine, and is a proteolytic breakdown product of larger proteins. It belongs to the family of N-acyl-alpha amino acids and derivatives. These are compounds containing an alpha amino acid which bears an acyl group at its terminal nitrogen atom. gamma-Glutamylhistidine is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis.
In non-diabetic kidney scarring the protein crosslinking enzyme tissue transglutaminase (tTg) has been implicated in the process by the formation of increased epsilon-(gamma-glutamyl)lysine bonds between ECM components in both experimental and human disease. Changes in tTg and epsilon-(gamma-glutamyl)lysine occur in human Diabetic nephropathy as well, the leading cause of chronic kidney failure. (PMID 15292688). In Parkinson's disease (PD), conformational changes in the alpha-synuclein monomer precede the formation of Lewy bodies. Both tTG and its substrate-characteristic N(epsilon)-(gamma-glutamyl)-lysine crosslink are increased in PD nigral dopamine neurons. (PMID 15001552). Expression of tissue transglutaminase (tTgase) and epsilon-(gamma-glutamyl)-lysine was present in all scarring of the blebs sites, being the main cause of failure in glaucoma filtration surgery. Transglutaminases are calcium-dependent enzymes that catalyze the posttranslational modification of proteins through an acyl transfer reaction between the gamma-carboxamide group of a peptide-bound glutaminyl residue and various amines. Covalent cross-linking using epsilon-(gamma-glutamyl)-lysine bonds is stable and resistant to enzymatic, chemical, and mechanical disruption. (PMID: 16936095).
1-methylinosine is inosine carrying a methyl substituent at position 1 on the hypoxanthine ring. It has a role as a metabolite. It derives from an inosine. It is a modified nucleotide found at position 37 in tRNA 3' to the anticodon of eukaryotic tRNA. Shown that sequences are forced to adopt a hairpin conformation if one of the central 6 nt is replaced by the corresponding methylated nucleotide, such as 1-methylguanosine. In Vivo synthesis: Inosine-37 in tRNA is synthesised by a hydrolytic deamination-type reaction, catalysed by distinct tRNA:adenosine deaminases.
Cyclic AMP (cAMP) or cyclic adenosine monophosphate is an adenine nucleotide containing one phosphate group which is esterified to both the 3'- and 5'-positions of the sugar moiety. cAMP is found in all organisms ranging from bacteria to plants to animals. In humans and other mammals it is a second messenger and a key intracellular regulator, functioning as a mediator of activity for a number of hormones, including epinephrine, glucagon and ACTH. cAMP is synthesized from ATP by adenylate cyclase. Adenylate cyclase is located at the inner side of cell membranes. Adenylate cyclase is activated by the hormones glucagon and adrenaline and by G protein. Liver adenylate cyclase responds more strongly to glucagon, and muscle adenylate cyclase responds more strongly to adrenaline. cAMP decomposition into AMP is catalyzed by the enzyme phosphodiesterase. cAMP is primarily used for intracellular signal transduction, such as transferring into cells the effects of hormones like glucagon and adrenaline, which cannot pass through the plasma membrane. cAMP is also involved in the activation of protein kinases. In addition, cAMP binds to and regulates the function of ion channels such as the HCN channels. Hyperpolarization-activated cyclic nucleotide‚Äìgated (HCN) channels are integral membrane proteins that serve as nonselective voltage-gated cation channels in the plasma membranes of heart and brain cells. HCN channels are sometimes referred to as pacemaker channels because they help to generate rhythmic activity within groups of heart and brain cells.
4,5-Dihydroorotic acid, also known as dihydroorotate or hydroorotate is a pyrimidinemonocarboxylic acid that results from the base-catalysed cyclisation of N-alpha-carbethoxyasparagine. It is classified as a secondary amide, a monocarboxylic acid, a pyrimidinemonocarboxylic acid and a N-acylurea. 4,5-Dihydroorotic acid is a derivative of orotic acid which serves as an intermediate in pyrimidine biosynthesis. 4,5-Dihydroorotic acid exists in all living species, ranging from bacteria to plants to humans. 4,5-Dihydroorotic acid is synthesized by the enzyme known as Dihydroorotase (EC 3.5.2.3) which converts carbamoyl aspartic acid into 4,5-dihydroorotic acid as part of the de novo pyrimidine biosynthesis pathway (PMID: 13163076). 4,5-Dihydroorotic acid is also a substrate for the enzyme known as dihydroorotate dehydrogenase (DHODH).  In mammalian species, DHODH catalyzes the fourth step in the de novo pyrimidine biosynthesis pathway, which involves the ubiquinone-mediated oxidation of dihydroorotate to orotate and the reduction of flavin mononucleotide (FMN) to dihydroflavin mononucleotide (FMNH2). Inhibition of DHODH activity with teriflunomide (an immunomodulatory drug) or expression with RNA interference results in reduced ROS generation and consequent apoptosis of transformed skin and prostate epithelial cells. Mutations in the DHOD gene have been shown to cause Miller syndrome, also known as Genee-Wiedemann syndrome, Wildervanck-Smith syndrome or post-axial acrofacial dystosis (PMID: 19915526).
Retinal is a carotenoid constituent of visual pigments. It is the oxidized form of retinol which functions as the active component of the visual cycle. It is bound to the protein opsin forming the complex rhodopsin. When stimulated by visible light, the retinal component of the rhodopsin complex undergoes isomerization at the 11-position of the double bond to the cis-form; this is reversed in "dark" reactions to return to the native trans-configuration.
Ferulic acid 4-O-sulfate (CAS: 86321-29-1) is a phenolic acid metabolite. It is also a coffee metabolite found in blood or urine. Ferulic acid 4-O-sulfate was found to be elevated in rat urine after whole rye consumption which makes this compound a potential urinary biomarker of whole grain intake (PMID: 26862900).
4-Allylphenol sulfate, also known as chavicol hydrogen sulfate or p-allylphenyl sulfate, belongs to the class of organic compounds known as phenylsulfates. Phenylsulfates are compounds containing a sulfuric acid group conjugated to a phenyl group. 4-Allylphenol sulfate has been identified in blood (PMID: 26561314).
Omeprazole is a highly effective inhibitor of gastric acid secretion used in the therapy of stomach ulcers, dyspepsia, peptic ulcer disease , gastroesophageal reflux disease and Zollinger-Ellison syndrome. The drug inhibits the H(+)-K(+)-ATPase (H(+)-K(+)-exchanging ATPase) in the proton pump of Gastric Parietal Cells.--Pubchem. Omeprazole is one of the most widely prescribed drugs internationally and is available over the counter in some countries.
S-carboxymethylcysteine (carbocisteine) is the most frequently prescribed mucoactive agent for long-term COPD (chronic obstructive pulmonary disease) use in a number of countries. In addition to its mucoregulatory activity, carbocisteine exhibits free-radical scavenging and anti-inflammatory properties. S-Carboxymethyl-L-cysteine can be found in root vegetables and has been isolated from radish seedlings. S-carboxymethyl-L-cysteine can be detectable in urine especially after the processing of chlorinated compounds by gut microlfora.
Ectoine belongs to the class of organic compounds known as alpha-amino acids. These are amino acids in which the amino group is attached to the carbon atom immediately adjacent to the carboxylate group (alpha carbon). Ectoine has been identified in urine (PMID: 22409530).
Isobutyrylglycine is an acyl glycine. Acyl glycines are normally minor metabolites of fatty acids. However, the excretion of certain acyl glycines is increased in several inborn errors of metabolism. In certain cases the measurement of these metabolites in body fluids can be used to diagnose disorders associated with mitochondrial fatty acid beta-oxidation. Acyl glycines are produced through the action of glycine N-acyltransferase (EC 2.3.1.13) which is an enzyme that catalyzes the chemical reaction: acyl-CoA + glycine < -- > CoA + N-acylglycine. Isobutyrylglycine is identified in large amount in urine of patients with isobutyryl-CoA dehydrogenase deficiency. Isobutyryl-CoA dehydrogenase deficiency is a disorder caused by the deficiency of isobutyryl-CoA dehydrogenase that is involved in the catabolism of the branched-chain amino acid valine (PMID 15505379). Moreover, Isobutyrylglycine is found to be associated with ethylmalonic encephalopathy and propionic acidemia, which are also inborn errors of metabolism. Isobutyrylglycine is a biomarker for the consumption of cheese.
5'-Methylthioadenosine, also known as MTA or thiomethyladenosine, belongs to the class of organic compounds known as 5'-deoxy-5'-thionucleosides. These are 5'-deoxyribonucleosides in which the ribose is thio-substituted at the 5'position by a S-alkyl group. 5'-Methylthioadenosine is metabolized solely by MTA-phosphorylase, to yield 5-methylthioribose-1-phosphate and adenine, a crucial step in the methionine and purine salvage pathways, respectively. 5'-Methylthioadenosine exists in all living species, ranging from bacteria to humans. 5'-Methylthioadenosine (MTA) is a naturally occurring sulfur-containing nucleoside present in all mammalian tissues. Within humans, 5'-methylthioadenosine participates in a number of enzymatic reactions. In particular, 5'-methylthioadenosine and spermidine can be biosynthesized from S-adenosylmethioninamine and putrescine through the action of the enzyme spermidine synthase. In addition, 5'-methylthioadenosine can be converted into 5-methylthioribose 1-phosphate and L-methionine; which is catalyzed by the enzyme S-methyl-5'-thioadenosine phosphorylase. It is produced from S-adenosylmethionine mainly through the polyamine biosynthetic pathway, where it behaves as a powerful inhibitory product. For instance, 5'-Methylthioadenosine has been shown to influence the regulation of gene expression, proliferation, differentiation, and apoptosis (PMID:15313459). In humans, 5'-methylthioadenosine is involved in the metabolic disorder called hypermethioninemia. Outside of the human body, 5'-Methylthioadenosine has been detected, but not quantified in several different foods, such as soursops, allspices, summer grapes, alaska wild rhubarbs, and breadfruits. Elevated excretion appears in children with severe combined immunodeficiency syndrome (SCID) (PMID:3987052). Evidence suggests that 5'-Methylthioadenosine can affect cellular processes in many ways. 5'-Methylthioadenosine can be found in human urine.
N-Acetylputrescine is a polyamine commonly occurring excreted in normal human urine (PMID 7775374). N-Acetylputrescine is the most abundant of all polyamines both in normal individuals and in patients with leukemia (PMID 9464484). N-Acetylputrescine is the N-acetylated form of the naturally occurring polyamine called putrescine. The N-acetylation is mediated by the enzyme diamine N-acetyltransferase. Putrescine is related to cadaverine (another polyamine). Both are produced by the breakdown of amino acids in living and dead organisms and both are toxic in large doses. Putrescine and cadaverine are largely responsible for the foul odor of putrefying flesh, but also contribute to the odor of such processes as bad breath and bacterial vaginosis. Putrescine is also found in semen. Putrescine attacks s-adenosyl methionine and converts it to spermidine. Spermidine in turn attacks another s-adenosyl methionine and converts it to spermine. Putrescine is synthesized in small quantities by healthy living cells by the action of ornithine decarboxylase. N-Acetylputrescine can be found in Corynebacterium as well (PMID:25919117).
alpha-Carboxyethyl hydrochroman (alpha-CEHC) has been identified as a major water-soluble metabolite of vitamin E, which circulates in the blood and is excreted in the urine (PMID: 12420750). About one-third of the alpha-CEHC circulating in the blood is present as alpha-CEHC glucuronide (PMID: 10552913).
Methylcitric acid (MCA) is elevated in body fluids of patients with propionic acidaemia (PA; OMIM 232000, 232050), methylmalonic aciduria (MMA; OMIM 251000, 251120) and multiple carboxylase deficiency (OMIM 253260, 253270), which are inherited disorders. MCA is formed by condensation of accumulated propionyl- CoA and oxalacetate by the enzyme si-citrate synthase (EC 4.1.3.7). MCA molecule has two stereogenic centers so that it can occur in the form of four stereoisomers. Only two stereoisomers of MCA, (2S, 3S) and (2R, 3S), were found in human urine (PMID: 17295121).
13-Methylmyristic acid (CAS# 2485-71-4), also known as 13-methyltetradecanoic acid, iso-pentadecanoic acid, 13-methyltetradecanoic acid, 13-MTD, or 13-MTDA, is an iso-fatty acid. It is used to study the induction of mitochondrial-mediated apoptosis via the AKT and MAPK pathways. 13-MTDA is used for the biosynthesis of methyl-branched polyhydroxyalkanoates
2-Methylglutaric acid, also known as alpha-methylglutarate or 2-methylpentanedioate, belongs to the class of organic compounds known as methyl-branched fatty acids. These are fatty acids with an acyl chain that has a methyl branch. Usually, they are saturated and contain only one or more methyl group. However, branches other than methyl may be present. 2-Methylglutaric acid is also classified as an alpha,omega-dicarboxylic acid. It is glutaric acid substituted at position 2 by a methyl group. 2-Methylglutaric acid arises from the microbial metabolism of the isoprenoid alkaloid pristane (PMID: 4327007; PMID: 20143352).
3-Methyladipic acid is a metabolite of the catabolism of phytanic acid. Patients with adult Refsums disease (ARD) are unable to detoxify phytanic acid by alpha-oxidation, and so the w-oxidation pathway is the only metabolic pathway available for phytanic acid degradation. This pathway produces 3-methyladipic acid as the final metabolite, which is excreted in the urine (Wanders et al. 2001). Activity of the w-oxidation pathway is approximately doubled in ARD patients compared with normal individuals (PMID: 11948235).
3-Hydroxyoctanoic acid (CAS: 14292-27-4) is an organic 3-hydroxy dicarboxylic acid, a metabolite of medium-chain fatty acid oxidation found in human urine. It is believed that urinary 3-hydroxy dicarboxylic acids are derived from the omega-oxidation of 3-hydroxy fatty acids and the subsequent beta-oxidation of longer-chain 3-hydroxy dicarboxylic acids. (PMID:1870421). 3-Hydroxyoctanoic acid has been identified in the human placenta (PMID: 32033212).
LysoPI(18:1(9Z)/0:0) is a lysophosphatidylinositol. The term 'lysophospholipid' (LPL) refers to any phospholipid that is missing one of its two O-acyl chains. Thus, LPLs have a free alcohol in either the sn-1 or sn-2 position. The prefix 'lyso-' comes from the fact that lysophospholipids were originally found to be hemolytic. However, it is now used to refer generally to phospholipids missing an acyl chain. LPLs are usually the result of phospholipase A-type enzymatic activity on regular phospholipids such as phosphatidylcholine or phosphatidic acid, although they can also be generated by the acylation of glycerophospholipids or the phosphorylation of monoacylglycerols. Lysophosphatidylinositols can have different combinations of fatty acids of varying lengths and saturation attached at the C-1 (sn-1) or C-2 (sn-2) position. LysoPI(18:1(9Z)/0:0), in particular, consists of one chain of oleic acid at the C-1 position.
MG(0:0/18:3(6Z,9Z,12Z)/0:0) is a monoacylglyceride. A monoglyceride, more correctly known as a monoacylglycerol, is a glyceride consisting of one fatty acid chain covalently bonded to a glycerol molecule through an ester linkage. Monoacylglycerol can be broadly divided into two groups; 1-monoacylglycerols (or 3-monoacylglycerols) and 2-monoacylglycerols, depending on the position of the ester bond on the glycerol moiety. Normally the 1-/3-isomers are not distinguished from each other and are termed 'alpha-monoacylglycerols', while the 2-isomers are beta-monoacylglycerols. Monoacylglycerols are formed biochemically via release of a fatty acid from diacylglycerol by diacylglycerol lipase or hormone sensitive lipase. Monoacylglycerols are broken down by monoacylglycerol lipase. They tend to be minor components only of most plant and animal tissues, and indeed would not be expected to accumulate because their strong detergent properties would have a disruptive effect on membranes. 2-Monoacylglycerols are a major end product of the intestinal digestion of dietary fats in animals via the enzyme pancreatic lipase. They are taken up directly by the intestinal cells and converted to triacylglycerols via the monoacylglycerol pathway before being transported in lymph to the liver. Mono- and Diglycerides are commonly added to commercial food products in small quantities. They act as emulsifiers, helping to mix ingredients such as oil and water that would not otherwise blend well.
Glycerylphosphorylethanolamine is a membrane breakdown product resulting from the cleavage of the lipid group from glycerophosphoethanlomine fatty acids (i.e. phosphatidylethanolamine). It acts as a growth stimulant for hepatocytes.
Glycerophosphoinositol (CAS: 16824-65-0), also known as 1-(sn-glycero-3-phospho)-1D-myo-inositol, is produced through deacylation by phospholipase B of the essential phospholipid phosphatidylinositol. Glycerophosphoinositols are ubiquitous phosphoinositide metabolites involved in the control of several cell functions. They exert their actions both intracellularly and by rapidly equilibrating across the plasma membrane. Their transport is mediated by the Glut2 transporter, the human ortholog of GIT1 (PMID: 17141226). Glycerophosphoinositol is a substrate for glycerophosphoinositol inositolphosphodiesterase (EC 3.1.4.43) and is involved in the following reaction: 1-(sn-glycero-3-phospho)-1D-myo-inositol + H2O = glycerol + 1D-myo-inositol 1-phosphate. It is also a substrate for glycerophosphoinositol glycerophosphodiesterase (EC 3.1.4.44) which catalyzes the chemical reaction: 1-(sn-glycero-3-phospho)-1D-myo-inositol + H2O = myo-inositol + sn-glycerol 3-phosphate.
Cholestenone belongs to the class of organic compounds known as cholesterols and derivatives. Cholesterols and derivatives are compounds containing a 3-hydroxylated cholestane core. Thus, cholestenone is considered to be a sterol lipid molecule. Cholestenone is a very hydrophobic molecule, practically insoluble in water, and relatively neutral.
Valylglutamine is a dipeptide composed of valine and glutamine. It is an incomplete breakdown product of protein digestion or protein catabolism. Dipeptides are organic compounds containing a sequence of exactly two alpha-amino acids joined by a peptide bond. Some dipeptides are known to have physiological or cell-signalling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis.
Valylleucine is a dipeptide composed of valine and leucine. It is an incomplete breakdown product of protein digestion or protein catabolism. Dipeptides are organic compounds containing a sequence of exactly two alpha-amino acids joined by a peptide bond. Some dipeptides are known to have physiological or cell-signalling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis.
2-Isopropylmalic acid (CAS: 3237-44-3), also known as 3-carboxy-3-hydroxyisocaproic acid, belongs to the class of organic compounds known as hydroxy fatty acids. These are fatty acids in which the chain bears a hydroxyl group. 2-Isopropylmalic acid is a very hydrophobic molecule, practically insoluble (in water), and relatively neutral. 2-Isopropylmalic acid is an alpha-hydroxy organic acid regularly occurring in the urine of healthy individuals (PMID: 2338430, 544608), and in hemofiltrates (PMID: 7251751). 2-Isopropylmalic acid is elevated during fasting and diabetic ketoacidosis (PMID: 1591279). It is also a metabolite found in Acetobacter (PMID: 6035258).
1,3-Dihydro-(2H)-indol-2-one, also known as 2-oxindole or 2-indolinone, belongs to the class of organic compounds known as indolines. Indolines are compounds containing an indole moiety, which consists of pyrrolidine ring fused to benzene to form 2,3-dihydroindole.
Allose is an aldohexose sugar. Allose is a C-3 epimer of glucose. D-allose is a rare sugar found in nature and, because of its very limited amount and of the high cost associated with its synthesis, its physiological functions remain virtually unknown (PMID 16080505). It is believed to have inhibitory effect on cancer cell proliferation (PMID 16142305), protective effects against ischemia reperfusion injury (PMID 14605979, 16716947), immunosuppressant on allogenic orthotopic liver transplantation (PMID 11120048), neuroprotective effects against retinal ischemia (PMID 16565406), suppress development of salt-induced hypertension (PMID 16148613) and an inhibitory effect on human ovarian carcinoma cells (PMID 16080505). It is a rare monosaccharide that has been isolated from the leaves of the African shrub Protea rubropilosa. It is soluble in water and practically insoluble in methanol.
11Z-Eicosenoic acid, also known as gondoic acid, is a member of the class of compounds known as long-chain fatty acids. Long-chain fatty acids are fatty acids with an aliphatic tail that contains between 13 and 21 carbon atoms. 11Z-Eicosenoic acid is practically insoluble (in water) and a weakly acidic compound (based on its pKa).  More specifically, 11Z-Eicosenoic acid is a monounsaturated omega-9 fatty acid found in a variety of nuts and plant oils. It is not produced by humans and comes from the diet. It has been found in the red blood cell membrane with increased concentrations in children with regressive autism (PMID: 16581239 ).
Glutathionate(1-), also known as Glutathionic acid or Glutathione, is classified as a member of the Oligopeptides. Oligopeptides are organic compounds containing a sequence of between three and ten alpha-amino acids joined by peptide bonds. Glutathionate(1-) is considered to be soluble (in water) and acidic
3,4-Dihydroxybutyric acid (also known as 3,4-Dihydroxybutanoic acid or 3,4-DB, or 2-deoxytetronic acid, or 2-DTA) is a normal human urinary metabolite that is excreted in increased concentration in patients with succinic semialdehyde dehydrogenase (SSADH) deficiency (PMID 12127325), which is a genetic disorder. SSADH deficiency is caused by an enzyme deficiency in GABA degradation. The most constant features with this disease are developmental delay, hypotonia and intellectual disability. Nearly half of SSADH patients exhibit ataxia, behavioral problems, seizures, and hyporeflexia. Normal adults excrete 0.37 +/- 0.15 (SD) mmoles of 3,4-dihydroxybutyrate per 24 hr. 3,4-dihydroxybutyrate is also detectable in blood. The renal clearance of 3,4-dihydroxybutyrate is roughly equal that of creatinine. 3,4-dihydroxybutyric acid has also been found in foods and is believed to be formed via the degradation (cooking) of di- and poly-saccharides (PMID: 1167165).  3,4-Dihydroxybutyric acid is believed to play a role in satiety or the feeling of fullness and suppresses food intake (PMID: 3191387; PMID: 6720928). 3,4-dihydroxybutyric acid is also elevated in the serum of individuals with dementia and may even serve as a predictive biomarker for dementia (PMID: 25177334). 3,4-Dihydroxybutyric acid is also a metabolite produced in Escherichia (PMID: 28342964).
Deoxyguanosine, also known as dG, belongs to the class of organic compounds known as purine 2'-deoxyribonucleosides. Purine 2'-deoxyribonucleosides are compounds consisting of a purine linked to a ribose which lacks a hydroxyl group at position 2‚Äô. Deoxyguanosine is a nucleoside consisting of the base guanine and the sugar deoxyribose. Deoxyguanosine is one of the four deoxyribonucleosides that make up DNA. Deoxyguanosine exists in all living species, ranging from bacteria to plants to humans. Deoxyguanosine participates in a number of enzymatic reactions. In particular, deoxyguanosine can be biosynthesized from 2'-deoxyguanosine 5'-monophosphate through the enzyme known as cytosolic purine 5'-nucleotidase. In addition, deoxyguanosine can be converted into 2'-deoxyguanosine 5'-monophosphate (dGMP); which is mediated by the enzyme deoxyguanosine kinase. Deoxyguanosine is involved in the rare, inherited metabolic disorder called the purine nucleoside phosphorylase deficiency (PNP deficiency). In particular PNP deficiency is characterized by elevated levels of dGTP (deoxyguanosine triphosphate). PNP accounts for approximately 4% of patients with severe combined immunodeficiency (PMID: 1931007). PNP-deficient patients suffer from recurrent infections, usually beginning in the first year of life. Two thirds of patients have evidence of neurologic disorders with spasticity, developmental delay and mental retardation. Deoxyguanosine can be converted to 8-hydroxy-deoxyguanosine (8-OHdG) due to hydroxyl radical attack at the C8 of guanine. 8-hydroxy-deoxyguanosine is a sensitive marker of the DNA damage This damage, if left unrepaired, has been proposed to contribute to mutagenicity and cancer promotion.
Erythritol is a sugar alcohol (or polyol), used as a food additive and sugar substitute. It is naturally occurring and is made from corn using enzymes and fermentation. Its formula is C4H10O4, or HO(CH2)(CHOH)2(CH2)OH; specifically, one particular stereoisomer with that formula. Erythritol is 60–70% as sweet as sucrose (table sugar), yet it is almost noncaloric and does not affect blood sugar or cause tooth decay. Erythritol occurs widely in nature and has been found to occur naturally in several foods including wine, sake, beer, watermelon, pear, grape, and soy sauce. Evidence indicates that erythritol also exists endogenously in the tissues and body fluids of humans and animals. Erythritol is absorbed from the proximal intestine by passive diffusion in a manner similar to that of many low molecular weight organic molecules which do not have associated active transport systems. The rate of absorption is related to their molecular size. It passes through the intestinal membranes at a faster rate than larger molecules such as mannitol or glucose. In diabetics, erythritol has also been shown to be rapidly absorbed and excreted unchanged in the urine. Following absorption, ingested erythritol is rapidly distributed throughout the body and has been reported to occur in hepatocytes, pancreatic cells, and vascular smooth muscle cells. Erythritol also has been reported to cross the human placenta and to pass slowly from the plasma into the brain and cerebrospinal fluid (PMID:9862657). Erythritol is found to be associated with ribose-5-phosphate isomerase deficiency, which is an inborn error of metabolism.
3-Isoxazolidinone is found in pulses. 3-Isoxazolidinone is isolated from seedlings of Canavalia ensiformis (jack bean).
Octadec-9-enoic Acid, also known as 18:1, N-9 or Delta(9)-Octadecenoic acid, is classified as a member of the Long-chain fatty acids. Long-chain fatty acids are fatty acids with an aliphatic tail that contains between 13 and 21 carbon atoms. Octadec-9-enoic Acid is considered to be practically insoluble (in water) and acidic.  Octadec-9-enoic Acid can be synthesized from octadec-9-ene. It is also a parent compound for other transformation products, including but not limited to, 1-octadec-9-enoylglycero-3-phosphate, N-(2-hydroxy-1-methylethyl)-9-octadecenamide, and sterculic acid
Dihydrocaffeic acid 3-O-glucuronide is a polyphenol metabolite detected in biological fluids (PMID: 20428313).
PE(16:0/22:6(4Z,7Z,10Z,13Z,16Z,19Z)) is a phosphatidylethanolamine (PE or GPEtn). It is a glycerophospholipid in which a phosphorylethanolamine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphoethanolamines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PE(16:0/22:6(4Z,7Z,10Z,13Z,16Z,19Z)), in particular, consists of one chain of palmitic acid at the C-1 position and one chain of docosahexaenoic acid at the C-2 position. The palmitic acid moiety is derived from fish oils, milk fats, vegetable oils and animal fats, while the docosahexaenoic acid moiety is derived from fish oils. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PEs are neutral zwitterions at physiological pH. They mostly have palmitic or stearic acid on carbon 1 and a long chain unsaturated fatty acid (e.g. 18:2, 20:4 and 22:6) on carbon 2. PE synthesis can occur via two pathways. The first requires that ethanolamine be activated by phosphorylation and then coupled to CDP. The ethanolamine is then transferred from CDP-ethanolamine to phosphatidic acid to yield PE. The second involves the decarboxylation of PS.
LysoPE(0:0/18:2(9Z,12Z)) is a lysophosphatidylethanolamine or a lysophospholipid. The term 'lysophospholipid' (LPL) refers to any phospholipid that is missing one of its two O-acyl chains. Thus, LPLs have a free alcohol in either the sn-1 or sn-2 position. The prefix 'lyso-' comes from the fact that lysophospholipids were originally found to be hemolytic however it is now used to refer generally to phospholipids missing an acyl chain. LPLs are usually the result of phospholipase A-type enzymatic activity on regular phospholipids such as phosphatidylcholine or phosphatidic acid, although they can also be generated by the acylation of glycerophospholipids or the phosphorylation of monoacylglycerols. Some LPLs serve important signaling functions such as lysophosphatidic acid. Lysophosphatidylethanolamines (LPEs) can function as plant growth regulators with several diverse uses. (LPEs) are approved for outdoor agricultural use to accelerate ripening and improve the quality of fresh produce. They are also approved for indoor use to preserve stored crops and commercial cut flowers. As a breakdown product of phosphatidylethanolamine (PE), LPE is present in cells of all organisms.
LysoPE(0:0/20:0) is a lysophosphatidylethanolamine or a lysophospholipid. The term 'lysophospholipid' (LPL) refers to any phospholipid that is missing one of its two O-acyl chains. Thus, LPLs have a free alcohol in either the sn-1 or sn-2 position. The prefix 'lyso-' comes from the fact that lysophospholipids were originally found to be hemolytic however it is now used to refer generally to phospholipids missing an acyl chain. LPLs are usually the result of phospholipase A-type enzymatic activity on regular phospholipids such as phosphatidylcholine or phosphatidic acid, although they can also be generated by the acylation of glycerophospholipids or the phosphorylation of monoacylglycerols. Some LPLs serve important signaling functions such as lysophosphatidic acid. Lysophosphatidylethanolamines (LPEs) can function as plant growth regulators with several diverse uses. (LPEs) are approved for outdoor agricultural use to accelerate ripening and improve the quality of fresh produce. They are also approved for indoor use to preserve stored crops and commercial cut flowers. As a breakdown product of phosphatidylethanolamine (PE), LPE is present in cells of all organisms.
LysoPE(0:0/20:3(11Z,14Z,17Z)) or LPE(0:0/20:3(11Z,14Z,17Z)) is a lysophospholipid. The term 'lysophospholipid' (LPL) refers to any phospholipid that is missing one of its two O-acyl chains. Thus, LPLs have a free alcohol in either the sn-1 or sn-2 position. The prefix 'lyso-' comes from the fact that lysophospholipids were originally found to be hemolytic however it is now used to refer generally to phospholipids missing an acyl chain. LPLs are usually the result of phospholipase A-type enzymatic activity on regular phospholipids such as phosphatidylcholine or phosphatidic acid, although they can also be generated by the acylation of glycerophospholipids or the phosphorylation of monoacylglycerols. Some LPLs serve important signaling functions such as lysophosphatidic acid. Lysophosphatidylethanolamines (LPEs) can function as plant growth regulators with several diverse uses. (LPEs) are approved for outdoor agricultural use to accelerate ripening and improve the quality of fresh produce. They are also approved for indoor use to preserve stored crops and commercial cut flowers. As a breakdown product of phosphatidylethanolamine (PE), LPE is present in cells of all organisms.
LysoPE(16:0/0:0) is a lysophosphatidylethanolamine or a lysophospholipid. The term 'lysophospholipid' (LPL) refers to any phospholipid that is missing one of its two O-acyl chains. Thus, LPLs have a free alcohol in either the sn-1 or sn-2 position. The prefix 'lyso-' comes from the fact that lysophospholipids were originally found to be hemolytic however it is now used to refer generally to phospholipids missing an acyl chain. LPLs are usually the result of phospholipase A-type enzymatic activity on regular phospholipids such as phosphatidylcholine or phosphatidic acid, although they can also be generated by the acylation of glycerophospholipids or the phosphorylation of monoacylglycerols. Some LPLs serve important signaling functions such as lysophosphatidic acid. Lysophosphatidylethanolamines (LPEs) can function as plant growth regulators with several diverse uses. (LPEs) are approved for outdoor agricultural use to accelerate ripening and improve the quality of fresh produce. They are also approved for indoor use to preserve stored crops and commercial cut flowers. As a breakdown product of phosphatidylethanolamine (PE), LPE is present in cells of all organisms.
LysoPE(18:3(9Z,12Z,15Z)/0:0) is a lysophosphatidylethanolamine or a lysophospholipid. The term 'lysophospholipid' (LPL) refers to any phospholipid that is missing one of its two O-acyl chains. Thus, LPLs have a free alcohol in either the sn-1 or sn-2 position. The prefix 'lyso-' comes from the fact that lysophospholipids were originally found to be hemolytic however it is now used to refer generally to phospholipids missing an acyl chain. LPLs are usually the result of phospholipase A-type enzymatic activity on regular phospholipids such as phosphatidylcholine or phosphatidic acid, although they can also be generated by the acylation of glycerophospholipids or the phosphorylation of monoacylglycerols. Some LPLs serve important signaling functions such as lysophosphatidic acid. Lysophosphatidylethanolamines (LPEs) can function as plant growth regulators with several diverse uses. (LPEs) are approved for outdoor agricultural use to accelerate ripening and improve the quality of fresh produce. They are also approved for indoor use to preserve stored crops and commercial cut flowers. As a breakdown product of phosphatidylethanolamine (PE), LPE is present in cells of all organisms.
LysoPE(20:2(11Z,14Z)/0:0) is a lysophosphatidylethanolamine or a lysophospholipid. The term 'lysophospholipid' (LPL) refers to any phospholipid that is missing one of its two O-acyl chains. Thus, LPLs have a free alcohol in either the sn-1 or sn-2 position. The prefix 'lyso-' comes from the fact that lysophospholipids were originally found to be hemolytic however it is now used to refer generally to phospholipids missing an acyl chain. LPLs are usually the result of phospholipase A-type enzymatic activity on regular phospholipids such as phosphatidylcholine or phosphatidic acid, although they can also be generated by the acylation of glycerophospholipids or the phosphorylation of monoacylglycerols. Some LPLs serve important signaling functions such as lysophosphatidic acid. Lysophosphatidylethanolamines (LPEs) can function as plant growth regulators with several diverse uses. (LPEs) are approved for outdoor agricultural use to accelerate ripening and improve the quality of fresh produce. They are also approved for indoor use to preserve stored crops and commercial cut flowers. As a breakdown product of phosphatidylethanolamine (PE), LPE is present in cells of all organisms.
LysoPI(18:0/0:0) is a lysophosphatidylinositol. The term 'lysophospholipid' (LPL) refers to any phospholipid that is missing one of its two O-acyl chains. Thus, LPLs have a free alcohol in either the sn-1 or sn-2 position. The prefix 'lyso-' comes from the fact that lysophospholipids were originally found to be hemolytic. However, it is now used to refer generally to phospholipids missing an acyl chain. LPLs are usually the result of phospholipase A-type enzymatic activity on regular phospholipids such as phosphatidylcholine or phosphatidic acid, although they can also be generated by the acylation of glycerophospholipids or the phosphorylation of monoacylglycerols. Lysophosphatidylinositols can have different combinations of fatty acids of varying lengths and saturation attached at the C-1 (sn-1) or C-2 (sn-2) position. LysoPI(18:0/0:0), in particular, consists of one chain of stearic acid at the C-1 position.
PS(15:0/22:0) is a phosphatidylserine. It is a glycerophospholipid in which a phosphorylserine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, phosphatidylserines can have many different combinations of fatty acids of varying lengths and saturation attached to the C-1 and C-2 positions. PS(15:0/22:0), in particular, consists of one chain of pentadecanoic acid at the C-1 position and one chain of behenic acid at the C-2 position. Phosphatidylserine or 1,2-diacyl-sn-glycero-3-phospho-L-serine is distributed widely among animals, plants, and microorganisms. Phosphatidylserine is an acidic (anionic) phospholipid with three ionizable groups (i.e. the phosphate moiety, the amino group and the carboxyl group). As with other acidic lipids, it exists in nature in salt form, but it has a high propensity to chelate calcium via the charged oxygen atoms of both the carboxyl and phosphate moieties, modifying the conformation of the polar head group. This interaction may be of considerable relevance to the biological function of phosphatidylserine. While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. Phosphatidylserines typically carry a net charge of -1 at physiological pH. They mostly have a palmitic or stearic acid on carbon 1 and a long chain unsaturated fatty acid (e.g. 18:2, 20:4 and 22:6) on carbon 2. PS biosynthesis involves an exchange reaction of serine for ethanolamine in PE.
PS(15:0/22:1(13Z)) is a phosphatidylserine. It is a glycerophospholipid in which a phosphorylserine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, phosphatidylserines can have many different combinations of fatty acids of varying lengths and saturation attached to the C-1 and C-2 positions. PS(15:0/22:1(13Z)), in particular, consists of one chain of pentadecanoic acid at the C-1 position and one chain of erucic acid at the C-2 position. Phosphatidylserine or 1,2-diacyl-sn-glycero-3-phospho-L-serine is distributed widely among animals, plants, and microorganisms. Phosphatidylserine is an acidic (anionic) phospholipid with three ionizable groups (i.e. the phosphate moiety, the amino group and the carboxyl group). As with other acidic lipids, it exists in nature in salt form, but it has a high propensity to chelate calcium via the charged oxygen atoms of both the carboxyl and phosphate moieties, modifying the conformation of the polar head group. This interaction may be of considerable relevance to the biological function of phosphatidylserine. While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. Phosphatidylserines typically carry a net charge of -1 at physiological pH. They mostly have a palmitic or stearic acid on carbon 1 and a long chain unsaturated fatty acid (e.g. 18:2, 20:4 and 22:6) on carbon 2. PS biosynthesis involves an exchange reaction of serine for ethanolamine in PE.
LysoPE(22:4(7Z,10Z,13Z,16Z)/0:0) is a lysophosphatidylethanolamine or a lysophospholipid. The term 'lysophospholipid' (LPL) refers to any phospholipid that is missing one of its two O-acyl chains. Thus, LPLs have a free alcohol in either the sn-1 or sn-2 position. The prefix 'lyso-' comes from the fact that lysophospholipids were originally found to be hemolytic however it is now used to refer generally to phospholipids missing an acyl chain. LPLs are usually the result of phospholipase A-type enzymatic activity on regular phospholipids such as phosphatidylcholine or phosphatidic acid, although they can also be generated by the acylation of glycerophospholipids or the phosphorylation of monoacylglycerols. Some LPLs serve important signaling functions such as lysophosphatidic acid. Lysophosphatidylethanolamines (LPEs) can function as plant growth regulators with several diverse uses. (LPEs) are approved for outdoor agricultural use to accelerate ripening and improve the quality of fresh produce. They are also approved for indoor use to preserve stored crops and commercial cut flowers. As a breakdown product of phosphatidylethanolamine (PE), LPE is present in cells of all organisms.
Dephospho-CoA, also known as 3'-dephospho-CoA, belongs to the class of organic compounds known as purine ribonucleoside diphosphates. These are purine ribonucleosides with a diphosphate group linked to the ribose moiety. Thus, dephospho-CoA is considered to be a fatty ester lipid molecule. Dephospho-CoA is a very hydrophobic molecule, practically insoluble (in water), and relatively neutral. Outside of the human body, dephospho-CoA has been detected, but not quantified in, several different foods, such as wild leeks, summer savouries, arctic blackberries, biscuits, and persimmons. This could make dephospho-CoA a potential biomarker for the consumption of these foods. Dephospho-CoA is an intermediate in pantothenate and CoA biosynthesis. It is a substrate for bifunctional coenzyme A synthase which contains the dephospho-CoA kinase (EC 2.7.1.24). This enzyme catalyzes the final step in CoA biosynthesis: the phosphorylation of the 3'-hydroxyl group of ribose using ATP as a phosphate donor. The reaction is ATP + 3'-dephospho-CoA = ADP + CoA.
Allodesmosine is found in animal foods. Allodesmosine is isolated from hydrolysate of bovine ligamentum nuchae elastin.
alpha,beta-Dihydroxanthohumol is found in alcoholic beverages. alpha,beta-Dihydroxanthohumol is a constituent of hops (Humulus lupulus)
Jurubine is found in fruits. Jurubine is an alkaloid from Solanum torvum (pea eggplant).
Prenyl arabinosyl-(1->6)-glucoside is found in fruits. Prenyl arabinosyl-(1->6)-glucoside is a constituent of purple passion fruit Passiflora edulis.
Choline ascorbate is also known as choline ascorbic acid. Choline ascorbate is slightly soluble (in water) and a weakly acidic compound (based on its pKa). Choline ascorbate can be found in wild celery, which makes choline ascorbate a potential biomarker for the consumption of this food product.
12-Ketodeoxycholic acid is a bile acid. Bile acids are steroid acids found predominantly in the bile of mammals. The distinction between different bile acids is minute, depending only on the presence or absence of hydroxyl groups on positions 3, 7, and 12. Bile acids are physiological detergents that facilitate excretion, absorption, and transport of fats and sterols in the intestine and liver. Bile acids are also steroidal amphipathic molecules derived from the catabolism of cholesterol. They modulate bile flow and lipid secretion, are essential for the absorption of dietary fats and vitamins, and have been implicated in the regulation of all the key enzymes involved in cholesterol homeostasis. Bile acids recirculate through the liver, bile ducts, small intestine and portal vein to form an enterohepatic circuit. They exist as anions at physiological pH and, consequently, require a carrier for transport across the membranes of the enterohepatic tissues. The unique detergent properties of bile acids are essential for the digestion and intestinal absorption of hydrophobic nutrients. Bile acids have potent toxic properties (e.g. membrane disruption) and there are a plethora of mechanisms to limit their accumulation in blood and tissues (PMID: 11316487, 16037564, 12576301, 11907135).
Indigo carmine, also known as C.I. Pigment Blue 63, or indigo blue, belongs to the class of organic compounds known as indolines. Indolines are compounds containing an indole moiety, which consists of pyrrolidine ring fused to benzene to form 2,3-dihydroindole. Indigo carmine is an indigo derivative that is produced by sulfonation of indigo, which makes the compound water soluble (up to 10 g/L). Indigo carmine exists as a bright purple solid and is an extremely weak basic (essentially neutral) compound (based on its pKa). It is approved for use as a food colorant in the U.S and E.U. It is also used as a medical dye. In obstetric surgery, indigo carmine solutions are sometimes employed to detect amniotic fluid leaks. In urologic surgery, intravenous injection of indigo carmine is often used to highlight portions of the urinary tract. The dye is filtered rapidly by the kidneys from the blood, and colors the urine blue. This enables structures of the urinary tract to be seen in the surgical field and demonstrates if there is a leak. A frequently encountered cardiovascular effect of intravenous indigo carmine administration is temporary alpha-receptor stimulation. Skin discoloration may occur at high doses. According to one study, the primary action of indigo carmine appears to be at the level of nitric oxide generation and/or its release from the endothelium. In addition to this, indigo carmine appears to inhibit vascular smooth muscle guanylyl cyclase. Therefore, indigo carmine may increase blood pressure by interfering with these nitric oxide-mediated vasodilatory mechanisms. Moreover, incubation of isotopically labeled indigo carmine with intestinal contents of rats for 48 h suggested that isatin-5-sulphonic acid and 5-sulphoanthranilic acid may possibly be metabolites formed by intestinal bacterial metabolism of the drug.
Pyroglutamylglycine belongs to the class of organic compounds known as alpha amino acids. These are amino acids in which the amino group is attached to the carbon atom immediately adjacent to the carboxylate group (alpha carbon).
1,25-Dihydroxyvitamin D3-26,23-lactone (1,25(OH)2D3-26,23-lactone) is a vitamin D3 metabolite. The formation of 1,25(OH)2D3-26,23-lactone occurs in normocalcemic states and in situations in which 1,25(OH)2D3 has been administered. (PMID: 6324253). 1,25-dihydroxyvitamin D3 and (23S)-1,23,25-trihydroxyvitamin D3 are efficient precursors to 1,25(OH)2D3-26,23-lactone. 1,25(OH)2D3-26,23-lactone has an inhibitory action of bone resorption and the lactone ring plays a major part in its expression. (PMID: 6548386, 1666030).
Lysylarginine is a dipeptide composed of lysine and arginine. It is an incomplete breakdown product of protein digestion or protein catabolism. Dipeptides are organic compounds containing a sequence of exactly two alpha-amino acids joined by a peptide bond. Some dipeptides are known to have physiological or cell-signalling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis.
(R)-2-Hydroxysterculic acid is found in nuts. (R)-2-Hydroxysterculic acid is a constituent of seed oils of Pachira aquatica (Malabar chestnut)
Tetracosapentaenioc acid is intermediate of Linolenic acid metabolism.
xi-4,5-Dihydro-2,4(5)-dimethyl-1H-imidazole is found in fishes. xi-4,5-Dihydro-2,4(5)-dimethyl-1H-imidazole is a volatile component of rainbow trout tissue.
Dehydrocyanaropicrin is found in globe artichoke. Dehydrocyanaropicrin is a constituent of Cynara scolymus (artichoke)
Bassic acid is found in fruits. Sapogen from the famine food Madhuca longifoli
Leucyl-Valine is a dipeptide composed of leucine and valine. It is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis. This dipeptide has not yet been identified in human tissues or biofluids and so it is classified as an 'Expected' metabolite.
Temazepam is only found in individuals that have used or taken this drug. It is a benzodiazepine that acts as a gamma-aminobutyric acid modulator and anti-anxiety agent. [PubChem]Benzodiazepines bind nonspecifically to benzodiazepine receptors, which affects muscle relaxation, anticonvulsant activity, motor coordination, and memory. As benzodiazepine receptors are thought to be coupled to gamma-aminobutyric acid-A (GABA<sub>A</sub>) receptors, this enhances the effects of GABA by increasing GABA affinity for the GABA receptor. Binding of the inhibitory neurotransmitter GABA to the site opens the chloride channel, resulting in a hyperpolarized cell membrane that prevents further excitation of the cell.
Ribavirin is only found in individuals that have used or taken this drug. It is a nucleoside antimetabolite antiviral agent that blocks nucleic acid synthesis and is used against both RNA and DNA viruses. [PubChem]Ribavirin is readily phosphorylated intracellularly by adenosine kinase to ribavirin mono-, di-, and triphosphate metabolites. Ribavirin triphosphate (RTP) is a potent competitive inhibitor of inosine monophosphate (IMP) dehydrogenase, viral RNA polymerase and messenger RNA (mRNA) guanylyltransferase (viral) and can be incorporated into RNA in RNA viral species. Guanylyltranserase inhibition stops the capping of mRNA. These diverse effects result in a marked reduction of intracellular guanosine triphosphate (GTP) pools and inhibition of viral RNA and protein synthesis. Ribavirin is also incorporated into the viral genome causing lethal mutagenesis and a subsequent decrease in specific viral infectivity.
Arecoline is found in nuts. Arecoline is isolated from betel nuts Arecoline is an alkaloid natural product found in the areca nut, the fruit of the areca palm (Areca catechu). It is an oily liquid that is soluble in water, alcohols, and ether. Owing to its muscarinic and nicotinic agonist properties, arecoline has shown improvement in the learning ability of healthy volunteers. Since one of the hallmarks of Alzheimer's disease is a cognitive decline, arecoline was suggested as a treatment to slow down this process and arecoline administered via i.v. route did indeed show modest verbal and spatial memory improvement in Alzheimer's patients, though due to arecoline's possible carcinogenic properties, it is not the first drug of choice for this degenerative disease
Deacetyldiltiazem is a metabolite product of the drug Diltiazem (a coronary vasodilator), and is present in the plasma of individuals taking that medication. (PMID 2328299). The action mechanisms involved in the effect of Deacetyldiltiazem on blood rheological (erythrocyte deformation) properties appeared to be similar to Diltiazem, but different from other metabolites of this drug. (PMID 3411434).
5,8-Epoxy-5,8-dihydro-10'-apo-b,y-carotene-3,10'-diol is found in citrus. 5,8-Epoxy-5,8-dihydro-10'-apo-b,y-carotene-3,10'-diol is isolated from Persea americana (avocado) and from Valencia orange juice.
Selective A2 adenosine receptor agonist; potent coronary vasodilator; weak inhibitor of adenosine uptake by rat cerebral cortical synaptosomes; used as a vasodilator agent; is a potent anti-inflammatory agent, acting at its four G protein coupled receptors. Topical treatment of adenosine to foot wounds in diabetes mellitus has been shown in lab animals to drastically increase tissue repair and reconstruction. Topical administration of adenosine for use in wound healing deficiencies and diabetes mellitus in humans is currently under clinical investigation. Adenosine is a nucleoside comprised of adenine attached to a ribose (ribofuranose) moiety via a beta-N9-glycosidic bond.
Selective A2 adenosine receptor agonist; potent coronary vasodilator; weak inhibitor of adenosine uptake by rat cerebral cortical synaptosomes; used as a vasodilator agent; is a potent anti-inflammatory agent, acting at its four G protein coupled receptors. Topical treatment of adenosine to foot wounds in diabetes mellitus has been shown in lab animals to drastically increase tissue repair and reconstruction. Topical administration of adenosine for use in wound healing deficiencies and diabetes mellitus in humans is currently under clinical investigation. Adenosine is a nucleoside comprised of adenine attached to a ribose (ribofuranose) moiety via a beta-N9-glycosidic bond.
Homoarecoline is found in nuts. Homoarecoline is isolated from betel nuts.
(all-E)-1,7,9-Heptadecatriene-11,13,15-triyne is a constituent of Artemisia vulgaris (mugwort)
alpha-Methylstyrene belongs to the family of Phenylpropenes. These are compounds containing a phenylpropene moeity, which consists of a propene substituent bound to a phenyl group.
N-Trifluoroacetyladriamycin is a metabolite of valrubicin. Valrubicin (N-trifluoroacetyladriamycin-14-valerate, trade name Valstar) is a chemotherapy drug used to treat bladder cancer. Valrubicin is a semisynthetic analog of the anthracycline doxorubicin, and is administered by infusion directly into the bladder. It was originally launched as Valstar in the U.S. (Wikipedia)
Dehydrowarfarin is a metabolite of warfarin. Warfarin (also known under the brand names Coumadin, Jantoven, Marevan, Lawarin, Waran, and Warfant) is an anticoagulant normally used in the prevention of thrombosis and thromboembolism, the formation of blood clots in the blood vessels and their migration elsewhere in the body respectively. It was initially introduced in 1948 as a pesticide against rats and mice and is still used for this purpose, although more potent poisons such as brodifacoum have since been developed. (Wikipedia)
S-6-Hydroxywarfarin is only found in individuals that have used or taken Warfarin. S-6-Hydroxywarfarin is a metabolite of Warfarin. S-6-hydroxywarfarin belongs to the family of Chromones. These are compounds containing a benzopyran-4-one moiety.
R-8-Hydroxywarfarin is only found in individuals that have used or taken Warfarin. R-8-Hydroxywarfarin is a metabolite of Warfarin. R-8-hydroxywarfarin belongs to the family of Chromones. These are compounds containing a benzopyran-4-one moiety.
This compound belongs to the family of Glucuronides. These are compounds comprising the glucuronic acid linked to another substance via a glycosidic bond
Coprosterol or coprostanol is a cholesterol derivative found in human feces, gallstones, eggs, and other biological matter. Coprosterol is the odorous principle of feces. It is formed from the biohydrogenation of cholesterol (cholest-5en-3&#946;-ol) in the gut of most higher animals and birds. This compound has frequently been used as a biomarker for the presence of human faecal matter in the environment. American physician Austin Flint named it stercorin (Wikipedia). The transformation of cholesterol into coprosterol in its passage through the body involves a reduction of the C5:C6 double bond, and a transition from the allocholanic- to the cholanic-ring system. Although it is established that the bacterial flora of the intestine is concerned in the reduction process, the mechanism by which the stereochemical change is brought about is unknown. Current data suggests that cholestenone and coprostanone, and not cholesterol itself, are the immediate precursors of coprosterol which is formed from them in the intestine by bacterial reduction. Coprosterol is also a microbial metabolite, it can be produced by Lactobacillus (PMID: 20338415).
2(N)-methyl-norsalsolinol (NMNorsal) is a dihydroxylated tetrahydroisoquinoline derivative 2(N)-analogue of salsolinol, identified as a putative endogenous neurotoxin in patients with Parkinson's disease. A prominent blood-brain barrier (BBB) is described to exist for salsolinol, but penetration of NMNorsal occurs through the BBB into the caudate nucleus of the rat brain. There was no alteration in extracellular dopamine or 3,4-dihydroxyphenylacetic acid levels. (PMID 11924888). 2(N)-methyl-norsalsolinol was identified in L-DOPA-treated patients with Parkinson's disease and proposed to be responsible for behavioral changes. Atypical heterocyclic L-DOPA/dopamine metabolite NMNorsal is able to modify long-term regulation of serotonin and opioid receptor expression in striatum. Since the occurrence of hallucinosis or psychosis following L-DOPA treatment is related to the serotonergic system, these results probably reflect a link between NMNorsal and L-DOPA side effects in Parkinson's disease. (PMID 14607311).
Coriandrone E is found in coriander. Coriandrone E is a constituent of Coriandrum sativum (coriander) (Umbelliferae)
Lauroyl-CoA is a substrate for Protein FAM34A.
Menadione is a synthetic naphthoquinone without the isoprenoid side chain and biological activity, but can be converted to active vitamin K2, menaquinone, after alkylation in vivo. -- Pubchem; Despite the fact that it can serve as a precursor to various types of vitamin K, menadione is generally not used as a nutritional supplement. Large doses of menadione have been reported to cause adverse outcomes including hemolytic anemia due to G6PD deficiency, neonatal brain or liver damage, or neonatal death in some cases. Moreover, menadione supplements have been banned by the FDA because of their high toxicity. It is sometimes called vitamin K3, although derivatives of naphthoquinone without the sidechain in the 3-position cannot exert all the functions of the K vitamins. Menadione is a vitamin precursor of K2 which utilizes alkylation in the liver to yield menaquinones (MK-n, n=1-13; K2 vitamers), and hence, is better classified as a provitamin. -- Wikipedia.
Androstenol is a steroidal compound belonging to the group of odorous 16-androstenes, first isolated from boar testes and also found in humans. Androstenol has pheromone-like properties in both animals and humans, but the molecular targets of its pheromonal activity are unknown. Androstenol as a pheromone is well suited because of high volatility and lipophilicity. (PMID: 1419890, 8142319, 16415088). 3a-Hydroxyandrost-16-ene is a steroidal compound belonging to the group of odorous 16-androstenes, first isolated from boar testes and also found in humans. 3a-Hydroxyandrost-16-ene has pheromone-like properties in both animals and humans, but the molecular targets of its pheromonal activity are unknown. 3a-Hydroxyandrost-16-ene is structurally similar to endogenous A-ring reduced neurosteroids that act as positive modulators of GABAA receptors. 3a-Hydroxyandrost-16-ene has neurosteroid-like activity as a GABAA receptor modulator. The various actions of 3a-Hydroxyandrost-16-ene in the whole-animal models are consistent with its activity as a GABAA receptor modulator. GABAA receptors could represent a target for 3a-Hydroxyandrost-16-ene as a pheromone, for which it is well suited because of high volatility and lipophilicity, or as a conventional hormonal neurosteroid. (PMID: 1419890, 8142319, 16415088).
Dimethyldithiophosphate, also known as O,O-dimethyldithiophosphate, O,O-dimethyl phosphorodithioate, copper (+1) salt or O,O-dimethyldithiophosphoric acid, is classified as a member of the phosphorodithioic acid O,O-diesters. Phosphorodithioic acid O,O-diesters are organooxygen compounds that contain a phosphorodithioic acid, which is O,O-disubstituted by an organyl group. Dimethyldithiophosphate is considered to be slightly soluble (in water) and acidic. (ChemoSummarizer)
L-Hypoglycin A is found in fruits. L-Hypoglycin A is isolated from the unripe fruit of akee apple (Blighia sapida
Ethyl maltol, also known as 3-hydroxy-2-ethyl-4-pyrone or indium ethylmaltol, is a member of the class of compounds known as pyranones and derivatives. These compounds contain a pyran ring which bears a ketone. Ethyl maltol is soluble (in water) and a very weakly acidic compound (based on its pKa). Ethyl maltol is an organic compound that is a common flavourant in some confectioneries. It is related to the more common flavorant maltol by replacement of the methyl group with an ethyl group. It is a white solid with a sweet smell that can be described as caramelized sugar and cooked fruit (Wikipedia). Ethyl maltol is a flavour enhancer, flavouring agent, and a sweetener. It has 4-6X the potency of 3-hydroxy-2-methyl-4H-pyran-4-one.
Procarbazine is only found in individuals that have used or taken this drug. It is an antineoplastic agent used primarily in combination with mechlorethamine, vincristine, and prednisone (the MOPP protocol) in the treatment of Hodgkin's disease. [PubChem]The precise mode of cytotoxic action of procarbazine has not been clearly defined. There is evidence that the drug may act by inhibition of protein, RNA and DNA synthesis. Studies have suggested that procarbazine may inhibit transmethylation of methyl groups of methionine into t-RNA. The absence of functional t-RNA could cause the cessation of protein synthesis and consequently DNA and RNA synthesis. In addition, procarbazine may directly damage DNA. Hydrogen peroxide, formed during the auto-oxidation of the drug, may attack protein sulfhydryl groups contained in residual protein which is tightly bound to DNA.
Debrisoquine is metabolized to 4-hydroxydebrisoquine by CYP2D6. Due to this, it has been used widely to determine the hydroxylation capacity of the enzyme.(PMID:15843230).
O-Isopentenylhalfordinol is found in fruits. O-Isopentenylhalfordinol is an alkaloid from Aegle marmelos (bael fruit
Arginylphenylalanine is a dipeptide composed of arginine and phenylalanine. It is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis.
Arginyltryptophan is a dipeptide composed of arginine and tryptophan. It is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis.
Arginylleucine is a dipeptide composed of arginine and leucine. It is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis.
Arginylisoleucine is a dipeptide composed of arginine and isoleucine. It is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis.
Lysylphenylalanine is a dipeptide composed of lysine and phenylalanine. It is an incomplete breakdown product of protein digestion or protein catabolism. Dipeptides are organic compounds containing a sequence of exactly two alpha-amino acids joined by a peptide bond. Some dipeptides are known to have physiological or cell-signalling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis.
Arginylmethionine is a dipeptide composed of arginine and methionine. It is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis.
DG(14:0/14:0/0:0) is a diglyceride, or a diacylglycerol (DAG). It is a glyceride consisting of two fatty acid chains covalently bonded to a glycerol molecule through ester linkages. Diacylglycerols can have many different combinations of fatty acids attached at both the C-1 and C-2 positions. DG(14:0/14:0/0:0), in particular, consists of two chains of myristic acid at the C-1 and C-2 positions. The myristic acid moieties are derived from nutmeg and butter. Mono- and diacylglycerols are common food additives used to blend together certain ingredients, such as oil and water, which would not otherwise blend well. Dacylglycerols are often found in bakery products, beverages, ice cream, chewing gum, shortening, whipped toppings, margarine, and confections. Synthesis of diacylglycerol begins with glycerol-3-phosphate, which is derived primarily from dihydroxyacetone phosphate, a product of glycolysis (usually in the cytoplasm of liver or adipose tissue cells). Glycerol-3-phosphate is first acylated with acyl-coenzyme A (acyl-CoA) to form lysophosphatidic acid, which is then acylated with another molecule of acyl-CoA to yield phosphatidic acid. Phosphatidic acid is then de-phosphorylated to form diacylglycerol. Diacylglycerols are precursors to triacylglycerols (triglyceride), which are formed by the addition of a third fatty acid to the diacylglycerol under the catalysis of diglyceride acyltransferase. Since diacylglycerols are synthesized via phosphatidic acid, they will usually contain a saturated fatty acid at the C-1 position on the glycerol moiety and an unsaturated fatty acid at the C-2 position.
N-Acetyl-b-glucosaminylamine is the product of a reaction catalyzed vy the enzyme N(4)-(beta-N-acetylglucosaminyl)-L-asparaginase [EC 3.5.1.26, Aspartylglucosaminidase, AGA]. AGA is a key enzyme in the catabolism of N-linked oligosaccharides of glycoproteins. It cleaves the asparagine from the residual N-acetylglucosamines as one of the final steps in the lysosomal breakdown of glycoproteins. Aspartylglucosaminuria (AGU) is a lysosomal disease caused by deficiency of N-aspartyl-beta-glucosaminidase. AGU is the only known lysosomal storage disease caused by an amidase deficiency. (OMIM208400).
This colourless crystalline solid is used in peptide synthesis. It is well known to form hydrogen bonded structures somewhat related to the base-pairing mechanism found in RNA and DNA. It is also a classic case of a molecule that exists as tautomers. Some publications only focus one of the two possible patterns, and neglect the influence of the other. For example, to calculation of the energy difference of the two tautomers in a non-polar solution will lead to a wrong result if a large quantity of the substance is on the side of the dimer in an equilibrium. The direct tautomerisation is not energetically favoured, but a dimerisation followed by a double proton transfer and dissociation of the dimer is a self catalytic path from one tautomer to the other. Protic solvents also mediate the proton transfer during the tautomerisation.
Acetomenaphthone is a synthetic vitamin.
N-[(5-Hydroxy-2-pyridinyl)methyl]adenosine is found in mushrooms. N-[(5-Hydroxy-2-pyridinyl)methyl]adenosine is isolated from Armillaria mellea (honey mushroom).
Leishmaniasis is a neglected disease caused by Leishmania, an intracellular protozoan parasite which possesses a unique thiol metabolism based on trypanothione. (PMID: 22928053) Trypanosomatids, the causative agents of several tropical diseases, rely on trypanothione as principal low molecular mass thiol, and their glutaredoxins readily react with the unique bis(glutathionyl) spermidine conjugate. (PMID: 22978520) Among the potential molecular target, Trypanothione reductase (TR) is considered an ideal enzyme since it is involved in the unique thiol-based metabolism observed in the Trypanosomatidae family and is a validated target for the search of antitrypanosomatidae drugs. (PMID: 23410156)
Benzophenone is the organic compound with the formula (C6H5)2CO, generally abbreviated Ph2CO. It is a widely used building block in organic chemistry, being the parent diarylketone. Benzophenone is found in fruits. Benzophenone is present in grapes and it is also used as a flavouring agent. Benzophenone is a common photosensitizer in photochemistry. It crosses from the S1 state into the triplet state with nearly 100% yield. The resulting diradical will abstract a hydrogen atom from a suitable hydrogen donor to form a ketyl radical.
Nonsystemic fungicid
2,4-Diamino-6-hydroxypyrimidine (DAHP) is a selective inhibitor of GTP cyclohydrolase I (GTPCH) that restricts the de novo synthesis of tetrahydrobiopterin (BH4) or the BH4 precursor in vascular smooth muscle cells (VSMC). (PMID 12883322). 2,4-Diamino-6-hydroxypyrimidine also inhibits nitric oxide (NO) in both Interferon-gamma (IFN-gamma) and antigen (Ag)/IgE (Ag/IgE) systems, increasing Mast cells (MC) degranulation. (PMID 14514683). Sepiapterin, a precursor to tetrahydrobiopterin in the salvage pathway, completely reverses the effect of 2,4-diamino-6-hydroxypyrimidine on neuronal NO-synthase (nNOS) ubiquitylation. (PMID 16216381).
2-Hydroxymyristic acid is an analog of myristic acid that becomes metabolically activated in cells to form 2-hydroxymyristoyl-CoA, a potent inhibitor of myristoyl-CoA:protein N-myristoyltransferase, the enzyme that catalyzes protein N-myristoylation. Treatment of T cells with 2-hydroxymyristic acid inhibits the myristoylation and alters the stability of p56lck. (PMID 8103677).
The Na salt is likely to be a minor component of sodium laurybenzenesulfonate used as a detergent in food processing. See <ht>CPZ38-G</ht> and <ht>CPZ42-D</ht
Hydroxyhexamide is a metabolite of acetohexamide. Acetohexamide (trade name Dymelor) is a first-generation sulfonylurea medication used to treat diabetes mellitus type 2, particularly in people whose diabetes cannot be controlled by diet alone. (Wikipedia)
Strepronin is a mucolytic drug. A mucolytic agent is any agent which dissolves thick mucus usually used to help relieve respiratory difficulties. The viscosity of mucous secretions in the lungs is dependent upon the concentrations of mucoprotein as well as the presence of disulfide bonds between these macromolecules and DNA.
Alpha-dihydroartemisinin is a metabolite of artemisinin. Artemisinin, also known as Qinghaosu, and its derivatives are a group of drugs that possess the most rapid action of all current drugs against Plasmodium falciparum malaria. Treatments containing an artemisinin derivative (artemisinin-combination therapies, ACTs) are now standard treatment worldwide for P. falciparum malaria. The starting compound artemisinin is isolated from the plant Artemisia annua, sweet wormwood, an herb employed in Chinese traditional medicine. (Wikipedia)
Pyrrolidine is found in alcoholic beverages. Pyrrolidine is widely distributed in foodstuffs in trace amts., presumably as bacterial decarboxylation produced of proline. Pyrrolidine is present in bread, milk, cheese, carrots, celery stalks, beer, spirits, coffee, caviar and fatty fish. Pyrrolidine is a flavouring agent.Pyrrolidine is a clear liquid with an unpleasant odor that is ammoniacal, fishy, shellfish-like and seaweed-like. Pyrrolidine is found naturally in the leaves of tobacco and carrot. The pyrrolidine ring structure is present in numerous natural alkaloids such as nicotine and hygrine. It is found in many pharmaceutical drugs such as procyclidine and bepridil. It also forms the basis for the racetam compounds (e.g. piracetam, aniracetam). Pyrrolidine is a pyrrolidine ring is the central structure of the amino acids proline and hydroxyproline. (Wikipedia) Pyrrolidine has been found to be a metabolite in Xenorhabdus (PMID: 19598185).
1-(Hydroxymethyl)-5,5-dimethyl-2,4-imidazolidinedione is a fda approved for use as an adjuvant in the bleaching of food-contact recycled paper and board used in food packagin
L-2-Amino-4-methylenepentanedioic acid is found in alcoholic beverages. L-2-Amino-4-methylenepentanedioic acid is a constituent of peanuts (Arachis hypogaea) and other plants, notably tulips and hops
Nepafenac is only found in individuals that have used or taken this drug. It is a non-steroidal anti-inflammatory prodrug (NSAID) usually sold as a prescription eye drop. It is used to treat pain and inflammation associated with cataract surgery.After penetrating the cornea as a prodrug, nepafenac undergoes rapid bioactivation to amfenac, which is a potent NSAID that uniformly inhibits the COX1 and COX2 activity.
alpha-Fluoro-beta-ureidopropionic acid is a metabolite of fluorouracil. Fluorouracil (5-FU or f5U) (sold under the brand names Adrucil, Carac, Efudix, Efudex and Fluoroplex) is a drug that is a pyrimidine analog which is used in the treatment of cancer. It is a suicide inhibitor and works through irreversible inhibition of thymidylate synthase. It belongs to the family of drugs called antimetabolites. It is typically administered with leucovorin. (Wikipedia)
E-10-Hydroxynortriptyline is only found in individuals that have used or taken Amitriptyline. E-10-Hydroxynortriptyline is a metabolite of Amitriptyline. E-10-hydroxynortriptyline belongs to the family of Dibenzocycloheptenes. These are compounds containing a dibenzocycloheptene moiety, which consists of two benzene connected by a cycloheptene ring.
Lorazepam glucuronide belongs to the family of Glucuronic Acid Derivatives. These are compounds containing a glucuronic acid moeity (or a derivative), which consists of a glucose moiety with the C6 carbon oxidized to a carboxylic acid.
Hesperetin 5-O-glucoside is found in fruits. Hesperetin 5-O-glucoside is isolated from peach (Persica vulgaris) stem bark.
6-Thioinosinic acid is a metabolite of azathioprine. Azathioprine is a purine analogue immunosuppressive drug. It is used to prevent rejection following organ transplantation, and to treat a vast array of autoimmune diseases, including rheumatoid arthritis, pemphigus, inflammatory bowel disease, multiple sclerosis, autoimmune hepatitis, atopic dermatitis, myasthenia gravis, neuromyelitis optica or Devic's disease, restrictive lung disease, and others. (Wikipedia)
Isocarboxazid is only found in individuals that have used or taken this drug. It is an MAO inhibitor that is effective in the treatment of major depression, dysthymic disorder, and atypical depression. It also is useful in the treatment of panic disorder and the phobic disorders. (From AMA, Drug Evaluations Annual, 1994, p311). Isocarboxazid works by irreversibly blocking the action of a chemical substance known as monoamine oxidase (MAO) in the nervous system. MAO subtypes A and B are involved in the metabolism of serotonin and catecholamine neurotransmitters such as epinephrine, norepinephrine, and dopamine. Isocarboxazid, as a nonselective MAO inhibitor, binds irreversibly to monoamine oxidase&ndash;A (MAO-A) and monoamine oxidase&ndash;B (MAO-B). The reduced MAO activity results in an increased concentration of these neurotransmitters in storage sites throughout the central nervous system (CNS) and sympathetic nervous system. This increased availability of one or more monoamines is the basis for the antidepressant activity of MAO inhibitors.
Valrubicin is only found in individuals that have used or taken this drug. It is a chemotherapy drug used to treat bladder cancer. Valrubicin is a semisynthetic analog of the anthracycline doxorubicin, and is administered by infusion directly into the bladder. [Wikipedia]Valrubicin is an anthracycline that affects a variety of inter-related biological functions, most of which involve nucleic acid metabolism. It readily penetrates into cells, where after DNA intercalation, it inhibits the incorporation of nucleosides into nucleic acids, causes extensive chromosomal damage, and arrests cell cycle in G2. Although valrubicin does not bind strongly to DNA, a principal mechanism of its action, mediated by valrubicin metabolites, is interference with the normal DNA breaking-resealing action of DNA topoisomerase II.
Cappariloside A is found in capers. Cappariloside A is a constituent of the fruit of Capparis spinosa (caper)
m-chlorophenylpiperazine (m-CPP) is a metabolite of trazodone. Trazodone (also sold under the brand names Desyrel, Oleptro, Beneficat, Deprax, Desirel, Molipaxin, Thombran, Trazorel, Trialodine, Trittico, and Mesyrel) is an antidepressant of the serotonin antagonist and reuptake inhibitor (SARI) class. It is a phenylpiperazine compound. Trazodone also has anxiolytic and hypnotic effects. Trazodone has considerably fewer prominent anticholinergic and sexual side effects than most of the tricyclic antidepressants (TCAs). (Wikipedia)
L-cis-Cyclo(aspartylphenylalanyl) is a degradation product product of Aspartame. L-cis-Cyclo(aspartylphenylalanyl) is a constituent  of roasted cocoa nibs [CCD
L-Ribo-2-Amino-4-hydroxy-3-methylpentanoic acid is found in herbs and spices. L-Ribo-2-Amino-4-hydroxy-3-methylpentanoic acid is a major constituent of Trigonella foenum-graecum (fenugreek
This compound belongs to the family of Naphthalenes. These are compounds containing a naphthalene moiety, which consists of two fused benzene rings.
Androstenol is a steroidal compound belonging to the group of odorous 16-androstenes, first isolated from boar testes and also found in humans. Androstenol has pheromone-like properties in both animals and humans, but the molecular targets of its pheromonal activity are unknown. Androstenol as a pheromone is well suited because of high volatility and lipophilicity. (PMID: 1419890, 8142319, 16415088). 3a-Hydroxyandrost-16-ene is a steroidal compound belonging to the group of odorous 16-androstenes, first isolated from boar testes and also found in humans. 3a-Hydroxyandrost-16-ene has pheromone-like properties in both animals and humans, but the molecular targets of its pheromonal activity are unknown. 3a-Hydroxyandrost-16-ene is structurally similar to endogenous A-ring reduced neurosteroids that act as positive modulators of GABAA receptors. 3a-Hydroxyandrost-16-ene has neurosteroid-like activity as a GABAA receptor modulator. The various actions of 3a-Hydroxyandrost-16-ene in the whole-animal models are consistent with its activity as a GABAA receptor modulator. GABAA receptors could represent a target for 3a-Hydroxyandrost-16-ene as a pheromone, for which it is well suited because of high volatility and lipophilicity, or as a conventional hormonal neurosteroid. (PMID: 1419890, 8142319, 16415088).
Induces formation of Epstein Barr Virus lymphocytes immediately following infection. (282990).
Flumioxazin is a herbicide used on soybeans, peanuts, orchard fruits and other crop
Ascorbyl stearate is a preservative for margarine Ascorbyl stearate (C24H42O7) is an ester formed from ascorbic acid and stearic acid. In addition to its use as a source of vitamin C, it is used as an antioxidant food additive in margarine (E number E305). The USDA limits its use to 0.02% individually or in conjunction with other antioxidants
Chlormezanone is only found in individuals that have used or taken this drug. It is a non-benzodiazepine that is used in the management of anxiety. It has been suggested for use in the treatment of muscle spasm. [PubChem]Chlormezanone binds to central benzodiazepine receptors which interact allosterically with GABA receptors. This potentiates the effects of the inhibitory neurotransmitter GABA, increasing the inhibition of the ascending reticular activating system and blocking the cortical and limbic arousal that occurs following stimulation of the reticular pathways.
Quercetin 3'-glucuronide is a metabolite of the dietary flavonols found in plasma and urine.
Tamibarotene is only found in individuals that have used or taken this drug. It is a novel synthetic retinoid for acute promyelocytic leukaemia (APL). Tamibarotene is currently approved in Japan for treatment of recurrent APL, and is undergoing clinical trials in the United States.Tamibarotene is a specific agonist for retinoic acid receptor alpha/beta with possible binding to retinoid X receptors (RXR).
9-(4-Hydroxyphenyl)-2-methoxy-1H-phenalen-1-one is found in fruits. 9-(4-Hydroxyphenyl)-2-methoxy-1H-phenalen-1-one is a constituent of Musa acuminata (dwarf banana)
Nmnh is a member of the class of compounds known as nicotinamide nucleotides. Nicotinamide nucleotides are pyridine nucleotides, in which the pyridine base is nicotinamide or a derivative thereof. Nmnh is soluble (in water) and a moderately acidic compound (based on its pKa). Nmnh can be found in a number of food items such as yautia, common grape, rocket salad (sspecies), and oval-leaf huckleberry, which makes nmnh a potential biomarker for the consumption of these food products.
N-lactoyl-Methionine is lactoyl derivative of methionine. N-lactoyl-amino acids are ubiquitous pseudodipeptides of lactic acid and amino acids that are rapidly formed by reverse proteolysis. A protease, cytosolic nonspecific dipeptidase 2 (CNDP2), catalyzes their formation. The plasma levels of these metabolites strongly correlate with plasma levels of lactate and amino acid. (PMID: 25964343)
L-cis-3-Amino-2-pyrrolidinecarboxylic acid is found in mushrooms. L-cis-3-Amino-2-pyrrolidinecarboxylic acid is isolated from Morchella esculenta (common morel
Nutrient supplement, pH control agent, sequestrant, stabiliser, protein modifier, emulsifier in production of processed cheeses, indirect food additive arising from use as a boiler water additive
1,2-dehydrosalsolinol(1-methyl-6,7-dihydroxy-3,4-dihydroisoquinolines) is formed through the decarboxylation of salsolinol-1-carboxylic acid (1-methyl-6,7-dihydroxy-1,2,3,4- tetrahydroisoquinoline-1-carboxylic acid), a novel endogenous catecholic adduct of dopamine and pyruvic acid, examined in nuclei-free homogenates of rat liver, whole brain, and kidney, as well as in buffer only. Liquid chromatographic analysis of incubations for varying times (30 min to 5 h) showed that the tetrahydroisoquinoline substrate decarboxylated oxidatively, forming the DSAL (PMID: 3369867). It is involved in Tyrosine Metabolism.
N'-nitrosonornicotine belongs to the family of Pyrrolidinylpyridines. These are compounds containing a pyrrolidinylpyridine ring system, which consists of a pyrrolidine ring linked to a pyridine ring.
Hydrocinnamic acid, also known as 3-phenylpropanoic acid or dihydrocinnamic acid, belongs to the class of organic compounds known as phenylpropanoic acids. Phenylpropanoic acids are compounds with a structure containing a benzene ring conjugated to a propanoic acid (C6-C3). Phenylpropanoic acid can be prepared from cinnamic acid by hydrogenation. Hydrocinnamic acid is a sweet, balsamic, and cinnamon tasting compound. This compound is used frequently in cosmetic products such as perfumes, bath gels, detergent powders, liquid detergents, fabric softeners, and soaps as it gives off a floral scent. A characteristic reaction of phenylpropanoic acid is its cyclization to indanones. Phenylpropanoic acid is used in the food industry to preserve and maintain the original aroma quality of frozen foods. Phenylpropanoic acid is also added to food for technological purposes in a wide variety including manufacturing, processing, preparation, treatment, packaging, transportation or storage, and food additives. This compound is used as a sweetener as well to sweeten food and can be found in tabletop sweeteners.
6-Hydroxy-1H-indole-3-acetamide is found in mushrooms. 6-Hydroxy-1H-indole-3-acetamide is an alkaloid from the edible mushroom Agrocybe cylindrace
D-myo-Inositol 1,4-bisphosphate belongs to the class of organic compounds known as inositol phosphates. Inositol phosphates are compounds containing a phosphate group attached to an inositol (or cyclohexanehexol) moiety. D-myo-Inositol 1,4-bisphosphate is an extremely weak basic (essentially neutral) compound (based on its pKa). D-myo-Inositol 1,4-bisphosphate is a substrate for several proteins including inositol polyphosphate 1-phosphatase, phosphatidylinositol 4,5-bisphosphate 5-phosphatase A, skeletal muscle and kidney enriched inositol phosphatase, and type I inositol-1,4,5-trisphosphate 5-phosphatase.
Estrone is a major mammalian estrogen. The conversion of the natural C19 steroids, testosterone and androstenedione into estrone is dependent on a complex key reaction catalyzed by the cytochrome P450 aromatase (EC 1.14.14.1, unspecific monooxygenase), which is expressed in many tissues of the adult human (e.g. ovary, fat tissue), but not in the liver. The ovaries after menopause continue to produce androstenedione and testosterone in significant amounts and these androgens are converted in fat, muscle, and skin into estrone. When women between the ages of 45 and 64 years have prophylactic oophorectomy (when hysterectomy is performed for benign disease to prevent the development of ovarian cancer), evidence suggests that oophorectomy increases the subsequent risk of coronary heart disease (CHD) and osteoporosis. Whereas 14,000 women die of ovarian cancer every year nearly 490,000 women die of heart disease and 48,000 women die within 1 year after hip fracture. Therefore, the decision to perform prophylactic oophorectomy should be approached with great caution for the majority of women who are at low risk of developing ovarian cancer. Steroid sulfatase (EC 3.1.6.2, STS) hydrolyzes steroid sulfates, such as estrone sulfate to estrone which can be converted to steroids with potent estrogenic properties, that is, estradiol; STS activity is much higher in breast tumors and high levels of STS mRNA expression in tumors are associated with a poor prognosis. The biological roles of estrogens in tumorigenesis are certainly different between the endometrium and breast, although both are considered "estrogen-dependent tissues". 17beta-hydroxysteroid dehydrogenases (EC 1.1.1.62, 17-HSDs) are enzymes involved in the formation of active sex steroids. estrone is interconverted by two enzymes 17-HSD types. Type 1 converts estrone to estradiol and Type 2 catalyzes the reverse reaction. (PMID: 17653961, 17513923, 17470679, 17464097).
Lansoprazole sulfone is only found in individuals that have used or taken Lansoprazole. Lansoprazole sulfone is a metabolite of Lansoprazole. Lansoprazole sulfone belongs to the family of Sulfinylbenzimidazoles. These are polycyclic aromatic compounds containing a sulfinyl group attached at the position 2 of a benzimidazole moiety.
lansoprazole sulfide is a metabolite of lansoprazole. Lansoprazole is a proton-pump inhibitor (PPI) which inhibits the stomach's production of gastric acids. It is manufactured by a number of companies worldwide under several brand names. In the United States it was first approved by the Food and Drug Administration (FDA) in 1995. Lansoprazole has been available as a generic drug since Prevacid patent protection expired on November 10, 2009. Since 2009 Lansoprazole has been available over the counter (OTC) in the U.S. (Wikipedia)
Liquoric acid is found in herbs and spices. Liquoric acid is a minor constituent of liquorice root (Glycyrrhiza glabra
Pipercide is found in herbs and spices. Pipercide is an alkaloid from the aerial parts of Piper retrofractum (Javanese long pepper) and the fruits of Piper nigrum (pepper).
Cortexolone, also known as cortodoxone or 11-deoxycortisol, belongs to the class of organic compounds known as 21-hydroxysteroids. These are steroids carrying a hydroxyl group at the 21-position of the steroid backbone. Thus, cortexolone is considered to be a steroid molecule. Cortexolone is an endogenous glucocorticoid steroid hormone, and a metabolic intermediate in the synthesis of cortisol. It was first described by Tadeusz Reichstein in 1938 and named as Substance S. It has also been referred to as Reichstein's Substance S or Compound S. Cortexolone acts as a glucocorticoid, though it is less potent than cortisol. Cortexolone is synthesized from 17Œ±-hydroxyprogesterone by 21-hydroxylase and is converted to cortisol by 11Œ≤-hydroxylase. As a result, the level of cortexolone is often measured in patients to diagnose impaired cortisol synthesis, to identify any enzyme deficiency that may be causing impairment along the pathway to cortisol, and to differentiate adrenal disorders. Cortexolone in mammals has limited biological activity and mainly acts as metabolic intermediate within the glucocorticoid pathway, leading to cortisol. On the other hand, in sea lampreys, cortexolone is the major glucocorticoid, with mineralocorticoid activity. Cortexolone in sea lampreys binds to specific corticosteroid receptors and is involved in intestinal osmoregulation and in sea lamprey at metamorphosis, a process in which they develop seawater tolerance before downstream migration.
10-Formyltetrahydrofolate (10-CHO-THF) is form of tetrahydrofolate that acts as a donor of formyl groups in anabolism. In particular, 10-CHO-THF is used as a substrate in a number of formyltransferase reactions. It plays an important role in purine biosynthesis, where 10-CHO-THF is a substrate for phosphoribosylaminoimidazolecarboxamide formyltransferase, as well as in the formylation of the methionyl initiator tRNA (fMet-tRNA), when 10-CHO-THF is a substrate for methionyl-tRNA formyltransferase. 10-Formyltetrahydrofolate is a substrate for Trifunctional purine biosynthetic protein adenosine-3, Bifunctional methylenetetrahydrofolate dehydrogenase/cyclohydrolase (mitochondrial), 10-formyltetrahydrofolate dehydrogenase, Folylpolyglutamate synthase (mitochondrial), Bifunctional purine biosynthesis protein PURH and C-1-tetrahydrofolate synthase (cytoplasmic).
Mukonidine is found in herbs and spices. Mukonidine is an alkaloid from the stem bark of Murraya koenigii (curryleaf tree
Nb-Feruloyltryptamine is found in cereals and cereal products. Nb-Feruloyltryptamine is found in kernels of sweet corn (Zea mays).
N,N'-diacetylchitobiose, also known as (GlcNAc)2, is classified as a member of the Acylaminosugars. Acylaminosugars are organic compounds containing a sugar linked to a chain through N-acyl group. N,N'-diacetylchitobiose is considered to be soluble (in water) and acidic.  N,N'-diacetylchitobiose may be a unique E.coli metabolite
6-trans-12-epi-Leukotriene B4 is the metabolite of lipid omega-oxidation of leukotriene B4 (LTB4). LTB4 is the major metabolite in neutrophil polymorphonuclear leukocytes. omega-Oxidation is the major pathway for the catabolism of leukotriene B4 in human polymorphonuclear leukocytes. Leukotrienes are metabolites of arachidonic acid derived from the action of 5-LO (5-lipoxygenase). The immediate product of 5-LO is LTA4 (leukotriene A4), which is enzymatically converted into either LTB4 (leukotriene B4) by LTA4 hydrolase or LTC4 (leukotriene C4) by LTC4 synthase. The regulation of leukotriene production occurs at various levels, including expression of 5-LO, translocation of 5-LO to the perinuclear region, and phosphorylation to either enhance or inhibit the activity of 5-LO. Biologically active LTB4 is metabolized by omega-oxidation carried out by specific cytochrome P450s (CYP4F) followed by beta-oxidation from the omega-carboxy position and after CoA ester formation (PMID: 7649996, 17623009, 2853166, 6088485). Leukotrienes are eicosanoids. The eicosanoids consist of the prostaglandins (PGs), thromboxanes (TXs), leukotrienes (LTs), and lipoxins (LXs). The PGs and TXs are collectively identified as prostanoids. Prostaglandins were originally shown to be synthesized in the prostate gland, thromboxanes from platelets (thrombocytes), and leukotrienes from leukocytes, hence the derivation of their names. All mammalian cells except erythrocytes synthesize eicosanoids. These molecules are extremely potent, able to cause profound physiological effects at very dilute concentrations. All eicosanoids function locally at the site of synthesis, through receptor-mediated G-protein linked signalling pathways.
Desoximetasone is only found in individuals that have used or taken this drug. It is a topical anti-inflammatory glucocorticoid used in dermatoses, skin allergies, psoriasis, etc. [PubChem]The precise mechanism of the antiinflammatory activity of topical steroids in the treatment of steroid-responsive dermatoses, in general, is uncertain. However, corticosteroids are thought to act by the induction of phospholipase A<sub>2</sub> inhibitory proteins, collectively called lipocortins. This is achieved first by the drug binding to the glucocorticoid receptors which then translocates into the nucleus and binds to DNA causing various activations and repressions of genes. It is postulated that these proteins control the biosynthesis of potent mediators of inflammation such as prostaglandins and leukotrienes by inhibiting the release of their common precursor arachidonic acid. Arachidonic acid is released from membrane phospholipids by phospholipase A<sub>2</sub>.
(-)-Arctigenin is found in burdock. (-)-Arctigenin is isolated from Cnicus benedictus, Forsythia viridissima, Arctium lappa, Ipomoea cairica and others (CCD).Arctigenin is a lignan found in certain plants of the Asteraceae , including the Greater burdock (Arctium lappa) and Saussurea heteromalla. It has shown antiviral and anticancer effects. It is the aglycone of arctiin. (Wikipedia
Tomatine is a mildly toxic glycoalkaloid or glycospirosolane (steroidal alkaloids whose structure contains a spirosolane skeleton) found in the stems and leaves of tomato plants as well as in the fruit of unripened (green) tomatoes (up to 500 mg/kg). Red, ripe tomatoes have somewhat reduced amounts of tomatine. A toxic dose of tomatine for an adult human would appear to require the consumption of at least 500 g of tomato leaves in one sitting (“Toxic Plants of North America” (Iowa State University Press, 2001)). Tomatine is known to have fungicidal and antimicrobial properties and is likely produced by tomato plants as a defense against bacteria, fungi, viruses, and insects  (PMID: 19514731). Some microbes produce an enzyme called tomatinase which can degrade tomatine, rendering it ineffective as an antimicrobial (PMID: 18835993).Tomatine has historically been used as a reagent in analytical chemistry for precipitating cholesterol from solution (PMID: 4362143). When lab animals ingest tomatine, essentially all of it passes through the animal unabsorbed. Tomatine apparently binds to cholesterol in the digestive tract, and the largely insoluble combination is excreted — ridding the body of both the alkaloid and cholesterol. Experiments with hamsters have shown that both tomatine-rich green tomatoes and purified tomatine can substantially lower the levels of undesirable LDL cholesterol while maintaining norma
1-Hydroxypyrene glucuronide belongs to the family of Pyrenes. These are compounds containing a pyrene moiety, which consists four fused benzene rings, resulting in a flat aromatic system
Erinapyrone C is found in mushrooms. Erinapyrone C is produced by the fungus Hericium erinaceus (lions mane).
Homoferreirin is found in chickpea. Homoferreirin is isolated from Cicer arietinum (chickpea
Methyl methanethiosulfonate is found in brassicas. Methyl methanethiosulfonate is isolated from cauliflower (Brassica oleracea var. botrytis). Methyl methanethiosulfonate is detected in the aroma of caucas (Allium victorialis). Antimutagenic agent
Methyl acrylate is a contact allergen present in nail lacquer. Methyl acrylate is a volatile alpha beta unsubstituted methyl ester used in the preparation of polyamidoamine (PAMAM) dendrimers typically by Michael addition with a primary amine.
gamma-Glutamyltyrosine is a dipeptide composed of gamma-glutamate and tyrosine, and is a proteolytic breakdown product of larger proteins. It belongs to the family of N-acyl-alpha amino acids and derivatives. These are compounds containing an alpha amino acid which bears an acyl group at its terminal nitrogen atom. gamma-Glutamyltyrosine is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis.
L-3-Aminodihydro-2(3H)-furanone is found in pulses. L-3-Aminodihydro-2(3H)-furanone is a constituent of pea Pisum sativum seedlings
(4-Methylphenyl)acetaldehyde is a flavouring ingredient with bitter almond odour and flavou
Carbadox is found in animal foods. Animal growth promoter especially for pigs. Banned in the EU. Carbadox is a permitted in USA subject to a 45-day withdrawal period (2001) Carbadox is a drug that combats parasite infection. In early 2004 it was banned by the Canadian government as a livestock feed additive and for human consumption. The European Union also forbids the use of Carbadox at any level. It is approved in the United States for use in swine for up to 42 days before slaughter
Obtustyrene is found in common pea. Obtustyrene is a stress metabolite of pe
N-Phenylacetylaspartic acid is found in pulses. N-Phenylacetylaspartic acid is a constituent of pea (Pisum sativum)
Heme A differs from heme B in that a methyl side chain at ring position 8 is oxidized into a formyl group, and one of the vinyl side chains, at ring position 2, has been replaced by an isoprenoid chain. Like heme B, heme A is often attached to the apoprotein (cytochromes or globins) through a coordination bond between the heme iron and a conserved amino acid side-chain. An example of a metalloprotein that contains heme A is cytochrome c oxidase. Both the formyl group and the isoprenoid side chain are thought to play important roles in conservation of the energy of oxygen reduction by cytochrome c oxidase.(Wikipedia).
Tyrosyl-Valine is a dipeptide composed of tyrosine and valine. It is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis. This dipeptide has not yet been identified in human tissues or biofluids and so it is classified as an 'Expected' metabolite.
Malvalic acid, also known as 2-octyl-1-cyclopropene-1-heptanoic acid or 8,9-methylen-8-heptadecensaeure, is a member of the class of compounds known as long-chain fatty acids. Long-chain fatty acids are fatty acids with an aliphatic tail that contains between 13 and 21 carbon atoms. Thus, malvalic acid is considered to be a fatty acid lipid molecule. Malvalic acid is practically insoluble (in water) and a weakly acidic compound (based on its pKa). Malvalic acid can be found in peanut and roselle, which makes malvalic acid a potential biomarker for the consumption of these food products. Malvalic acid is a cyclopropenic fatty acid found in cottonseed oil. The cyclopropene ring is thought to be one of the causes of abnormalities that develop in animals that ingest cottonseed oil. This reactivity could be cause for concern depending on concentration. Hydrogenation of the oil destroys malvalic acid .
15beta-Hydroxydesogestrel is a metabolite of desogestrel. Desogestrel is a molecule used in hormonal contraceptives. Most combined oral contraceptive pills (COCPs, or simply OCs) on the market today contain both an estrogen compound (ethinyl estradiol is common) plus a progestin (a progesterone-like compound) such as desogestrel. Desogestrel-containing birth control pills are sometimes referred to as 'third generation' oral contraceptives. In contrast, birth control pills that are considered 'second generation' (Tri-Levlen, for example) contain an estrogen and a progestin, but the progestin is different, such as levonorgestrel. (Wikipedia)
Felbamate is an anticonvulsant drug used in the treatment of epilepsy. It is used to treat partial seizures (with and without generalization) in adults and partial and generalized seizures associated with Lennox-Gastaut syndrome in children. It has a weak inhibitory effect on GABA receptor binding sites.
Cyclohexanones, also known as cn-54521-2ci-634tiletamine hydrochloride or cl 399, is a member of the class of compounds known as aralkylamines. Aralkylamines are alkylamines in which the alkyl group is substituted at one carbon atom by an aromatic hydrocarbyl group. Cyclohexanones can be found in tea, which makes cyclohexanones a potential biomarker for the consumption of this food product. Cyclohexanones is the organic compound with the formula (CH2)5CO. The molecule consists of six-carbon cyclic molecule with a ketone functional group. This colorless oil has an odor reminiscent of that of acetone. Over time, samples of cyclohexanone assume a yellow color. Cyclohexanones is slightly soluble in water and miscible with common organic solvents. Billions of kilograms are produced annually, mainly as a precursor to nylon .
It is used as a food additive .
Antihistamines such as azatadine appear to compete with histamine for histamine H1- receptor sites on effector cells. The antihistamines antagonize those pharmacological effects of histamine which are mediated through activation of H1- receptor sites and thereby reduce the intensity of allergic reactions and tissue injury response involving histamine release.
A selective, irreversible inhibitor of Type B monoamine oxidase. It is used in newly diagnosed patients with Parkinson's disease. It may slow progression of the clinical disease and delay the requirement for levodopa therapy. It also may be given with levodopa upon onset of disability. (From AMA Drug Evaluations Annual, 1994, p385) The compound without isomeric designation is Deprenyl. [PubChem]
(±)-Naled is an Agricultural insecticide, acaricide, bactericide and fungicid
nLc5Cer is classified as a member of the Glycosyl-N-acylsphingosines. Glycosyl-N-acylsphingosines are compounds containing a sphingosine linked to a simple glucosyl moiety. nLc5Cer is considered to be slightly soluble (in water) and acidic
Gambogic acid is found in fruits. Gambogic acid is isolated from Gamboge resin (exudate of Garcinia morella).
Rubidium is a soft, silvery-white metallic element of the alkali metal group, present in traces amounts in human tissues and fluids. Rb-87, a naturally occurring isotope, is (slightly) radioactive. Rubidium is very soft and highly reactive, with properties similar to other elements in group 1, like rapid oxidation in air. Rubidium, particularly 87Rb, in the form of vapor, is one of the most commonly-used atomic species employed for laser cooling and Bose-Einstein condensation. Its desirable features for this application include the ready availability of inexpensive diode laser light at the relevant wavelength, and the moderate temperatures required to obtain substantial vapor pressures. Physiologically, it exists as an ion in the body. It has been found slightly increased in neoplastic human breast tissues obtained from patients at the time of mastectomy, compared to normal tissue. (PMID: 6488192, 15820728, 7324778, 9630429, 577330).
Amifloxacin belongs to the family of Phenylpiperazines. These are compounds containing a phenylpiperazine skeleton, which consists of a piperazine bound to a phenyl group.
dehydronifedipine is a metabolite of nifedipine. Nifedipine (brand names Adalat, Nifediac, Cordipin, Nifedical, and Procardia) is a dihydropyridine calcium channel blocker. Its main uses are as an antianginal and antihypertensive, although a large number of other indications have recently been found for this agent, such as Raynaud's phenomenon, premature labor, and painful spasms of the esophagus such as in cancer and tetanus patients. (Wikipedia)
Hordenine is a potent phenylethylamine alkaloid with antibacterial and antibiotic properties produced in nature by several varieties of plants in the family Cactacea. The major source of hordenine in humans is beer brewed from barley. Hordenine in urine interferes with tests for morphine, heroin and other opioid drugs. Hordenine is a biomarker for the consumption of beer
Thymine glycol belongs to the family of Hydropyrimidines. These are compounds containing an hydrogenated pyrimidine ring (i.e containing less than the maximum bumber of double bonds.).
Thymidine glycol belongs to the family of Pyrimidine 2'-deoxyribonucleosides and Analogues. These are compounds consisting of a pyrimidine linked to a ribose which lacks an hydroxyl group at position 2.
Indecainide is only found in individuals that have used or taken this drug. It is a rarely used antidysrhythmic. Indecainide has local anesthetic activity and belongs to the membrane stabilizing (Class 1) group of antiarrhythmic agents; it has electrophysiologic effects characteristic of the IC class of antiarrhythmics.Indecainide acts on sodium channels on the neuronal cell membrane, limiting the spread of seizure activity and reducing seizure propagation. The antiarrhythmic actions are mediated through effects on sodium channels in Purkinje fibers.
Kynurenine is a metabolite of the amino acid tryptophan used in the production of niacin. L-Kynurenine is a central compound of the tryptophan metabolism pathway since it can change into the neuroprotective agent kynurenic acid or to the neurotoxic agent quinolinic acid. The break-up of these endogenous compounds' balance can be observable in many disorders such as stroke, epilepsy, multiple sclerosis, and amyotrophic lateral sclerosis. It can also occur in neurodegenerative disorders such as Parkinson's disease, Huntington's, and Alzheimer's disease; and in mental disorders such as schizophrenia and depression.
5,6-Epoxy-8,11,14-eicosatrienoic acid is an Epoxyeicosatrienoic acid (EET), a metabolite of arachidonic acid. The epoxyeicosatrienoic acids (EETs) are endogenous lipid mediators produced by P450 epoxygenases and metabolized through multiple pathways including soluble epoxide hydrolase (sEH). The cytochrome P-450 (P450) monooxygenase pathway includes enzymes of the CYP1A, CYP2B, CYP2C, CYP2E, and CYP2J subfamilies that catalyze the formation of four regioisomeric products, 5,6-, 8,9-, 11,12-, and 14,15-epoxyeicosatrienoic acid. EETs are produced in brain and perform important biological functions, including protection from ischemic injury. Both light flashes and direct glial stimulation produce vasodilatation mediated by EETs. EETs may be involved in the development of hypertension and endothelial dysfunction in DOCA-salt rats, but not in excessive collagen deposition or electrophysiological abnormalities. EETs have vasodilator and natriuretic effect. Blockade of EET formation is associated with salt-sensitive hypertension. (PMID: 17494091, 17468203, 17434916, 17406062, 17361113).
Ginsenoside Rb3 is found in tea. Ginsenoside Rb3 is a constituent of Panax ginseng (ginseng)
Levofloxacin is a synthetic fluoroquinolone antibacterial agent that inhibits the supercoiling activity of bacterial DNA gyrase, halting DNA replication. Levofloxacin is marketed by Ortho-McNeil under the trade name Levaquin. Chemically, levofloxacin is the S-enantiomer (L-isomer) of ofloxacin. -- Wikipedia.
Neoherculin is found in herbs and spices. Neoherculin is a constituent of Zanthoxylum species
Dezocine is a partial opiate drug and is used for pain management. Dezocine is a very effective alternative to fentanyl when administered during outpatient laparoscopy, although is associated with an increased incidence of postoperative nausea.
Purothionin AII is found in cereals and cereal products. Purothionin AII is isolated from wheat (Triticum monococcum). Toxic to brewers' yeast.
It is used as a food additive
3-Methoxysalicylic acid (CAS Number 877-22-5) is a beige fine crystalline powder. Its melting point is 147-150 C.
1-Pyrroline-5-carboxylic acid (CAS: 2906-39-0) is an enamine or an imino acid that forms upon the spontaneous dehydration of L-glutamate gamma-semialdehyde in aqueous solutions. The stereoisomer (S)-1-pyrroline-5-carboxylate is an intermediate in glutamate metabolism, arginine degradation, and proline biosynthesis and degradation. It can also be converted into or be formed from three amino acids: L-glutamate, L-ornithine, and L-proline. In particular, it is synthesized via the oxidation of proline by pyrroline-5-carboxylate reductase 1 (PYCR1) (EC 1.5.1.2) or by proline dehydrogenase (PRODH) (EC 1.5.99.8). It is hydrolyzed into L-glutamate by delta-1-pyrroline-5-carboxylate dehydrogenase (ALDH4A1) (EC 1.5.1.12). It is also one of the few metabolites that can act as a precursor to other metabolites of both the urea cycle and the tricarboxylic acid (TCA) cycle. Under certain conditions, pyrroline-5-carboxylate can act as a neurotoxin and a metabotoxin. A neurotoxin causes damage to nerve cells and nerve tissues. A metabotoxin is an endogenously produced metabolite that causes adverse health effects at chronically high levels. Chronically high levels of pyrroline-5-carboxylate are associated with at least five inborn errors of metabolism, including hyperprolinemia type I, hyperprolinemia type II, iminoglycinuria, prolinemia type II, and pyruvate carboxylase deficiency. Hyperprolinemia type II results in high levels of pyrroline-5-carboxylate. People with hyperprolinemia type II have signs and symptoms that vary in severity, but they are more likely than type I to have seizures or intellectual disability. Pyrroline-5-carboxylate is highly reactive and excess quantities have been shown to cause cell death and apoptosis (PMID: 15548746).
3D,7D,11D-Phytanic acid is an isomer of Phytanic acid, an unusual 20-carbon branched-chain fatty acid; Phytanic acid accumulates in blood and tissues of patients with Refsum disease (RD, an inborn error of lipid metabolism inherited as an autosomal recessive trait (OMIM 266500)), and is a reliable identifier of RD from a large number of other neurological disorders. Phytanic acid also accumulates in a number of other disorders with a very different clinical course: disorders of peroxisome biogenesis (Zellweger syndrome (OMIM 214100), neonatal adrenoleukodystrophy (OMIM 202370), infantile Refsum disease (OMIM 266510)) and rhizomelic chondrodysplasia punctata, type 1 (OMIM 215100). Phytanic acid is a 3-methyl fatty acid that cannot be beta-oxidized directly, and first undergoes an alpha-oxidation a reaction catalyzed by the enzyme phytanoyl-CoA hydroxylase, which is deficient in RD, the only true disorder of phytanic acid alpha-oxidation. (The Metabolic and Molecular Bases of Inherited Disease).
D-4-O-Methyl-myo-inositol is found in common pea. D-4-O-Methyl-myo-inositol is isolated from Vigna catjang and Medicago sativa (alfalfa
Asteltoxin is a mycotoxin of Aspergillus stellatus and Emericella varicolo
Butethal is only found in individuals that have used or taken this drug. It is a sedative and a hypnotic drug.Butethal binds at a distinct binding site associated with a Cl<sup>-</sup> ionopore at the GABA<sub>A</sub> receptor, increasing the duration of time for which the Cl<sup>-</sup> ionopore is open. The post-synaptic inhibitory effect of GABA in the thalamus is, therefore, prolonged. All of these effects are associated with marked decreases in GABA-sensitive neuronal calcium conductance (gCa). The net result of barbiturate action is acute potentiation of inhibitory GABAergic tone. Barbiturates also act through potent (if less well characterized) and direct inhibition of excitatory AMPA-type glutamate receptors, resulting in a profound suppression of glutamatergic neurotransmission.
54-Deoxy-50-hydroxyciguatoxin is found in fishes. 54-Deoxy-50-hydroxyciguatoxin is isolated from fish.
5alpha-Cholestane is found in potato. Cholestane is a saturated 27-carbon steroid precursor which serves as the basis for many organic molecules. (Wikipedia).
3',4'-Dihydrodiol is a metabolite of Phenytoin. 3',4'-dihydrodiol belongs to the family of Ureides. These are compounds containing an ureide group with the general structure R-CO-NH-CO-N(R)R'', formally derived by the acylation of urea.
4-Hydroxychalcone is found in herbs and spices. 4-Hydroxychalcone is a constituent of Glycyrrhiza glabra (licorice) roots
DG(14:0/22:2(13Z,16Z)/0:0) is a diglyceride, or a diacylglycerol (DAG). It is a glyceride consisting of two fatty acid chains covalently bonded to a glycerol molecule through ester linkages. Diacylglycerols can have many different combinations of fatty acids attached at both the C-1 and C-2 positions. DG(14:0/22:2(13Z,16Z)/0:0), in particular, consists of one chain of myristic acid at the C-1 position and one chain of docosadienoic acid at the C-2 position. The myristic acid moiety is derived from nutmeg and butter, while the docosadienoic acid moiety is derived from animal fats. Mono- and diacylglycerols are common food additives used to blend together certain ingredients, such as oil and water, which would not otherwise blend well. Dacylglycerols are often found in bakery products, beverages, ice cream, chewing gum, shortening, whipped toppings, margarine, and confections. Synthesis of diacylglycerol begins with glycerol-3-phosphate, which is derived primarily from dihydroxyacetone phosphate, a product of glycolysis (usually in the cytoplasm of liver or adipose tissue cells). Glycerol-3-phosphate is first acylated with acyl-coenzyme A (acyl-CoA) to form lysophosphatidic acid, which is then acylated with another molecule of acyl-CoA to yield phosphatidic acid. Phosphatidic acid is then de-phosphorylated to form diacylglycerol.Diacylglycerols are precursors to triacylglycerols (triglyceride), which are formed by the addition of a third fatty acid to the diacylglycerol under the catalysis of diglyceride acyltransferase. Since diacylglycerols are synthesized via phosphatidic acid, they will usually contain a saturated fatty acid at the C-1 position on the glycerol moiety and an unsaturated fatty acid at the C-2 position.
Streptozocin is only found in individuals that have used or taken this drug.It is an antibiotic that is produced by Stretomyces achromogenes. It is used as an antineoplastic agent and to induce diabetes in experimental animals. [PubChem]Although its mechanism of action is not completely clear, streptozocin is known to inhibit DNA synthesis, interfere with biochemical reactions of NAD and NADH, and inhibit some enzymes involved in gluconeogenesis. Its activity appears to occur as a result of formation of methylcarbonium ions, which alkylate or bind with many intracellular molecular structures including nucleic acids. Its cytotoxic action is probably due to cross-linking of strands of DNA, resulting in inhibition of DNA synthesis.
Dimethylglycine (DMG) is an amino acid derivative found in the cells of all plants and animals and can be obtained in the diet in small amounts from grains and meat. The human body produces DMG when metabolizing choline into glycine. Dimethylglycine that is not metabolized in the liver is transported by the circulatory system to body tissue. Dimethylglycine was popular with Russian athletes and cosmonauts owing to its reputed ability to increase endurance and reduce fatigue. DMG is also a byproduct of homocysteine metabolism. Homocysteine and betaine are converted to methionine and N,N-dimethylglycine by betaine-homocysteine methyltransferase. DMG in the urine is a biomarker for the consumption of legumes. It is also a microbial metabolite (PMID: 25901889).
Terconazole is only found in individuals that have used or taken this drug. It is an anti-fungal medication, primarily used to treat vaginal fungal infections. [Wikipedia]Terconazole may exert its antifungal activity by disrupting normal fungal cell membrane permeability. Terconazole and other triazole antifungal agents inhibit cytochrome P450 14-alpha-demethylase in susceptible fungi, which leads to the accumulation of lanosterol and other methylated sterols and a decrease in ergosterol concentration. Depletion of ergosterol in the membrane disrupts the structure and function of the fungal cell leading to a decrease or inhibition of fungal growth.
Licorisoflavan A is found in herbs and spices. Licorisoflavan A is a constituent of Glycyrrhiza uralensis (Chinese licorice).
Tyrosyl-Valine is a dipeptide composed of tyrosine and valine. It is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis. This dipeptide has not yet been identified in human tissues or biofluids and so it is classified as an 'Expected' metabolite.
Selective A2 adenosine receptor agonist; potent coronary vasodilator; weak inhibitor of adenosine uptake by rat cerebral cortical synaptosomes; used as a vasodilator agent; is a potent anti-inflammatory agent, acting at its four G protein coupled receptors. Topical treatment of adenosine to foot wounds in diabetes mellitus has been shown in lab animals to drastically increase tissue repair and reconstruction. Topical administration of adenosine for use in wound healing deficiencies and diabetes mellitus in humans is currently under clinical investigation. Adenosine is a nucleoside comprised of adenine attached to a ribose (ribofuranose) moiety via a beta-N9-glycosidic bond.
A drug formerly used as an antipsychotic but now used primarily in the treatment of various movement disorders including tardive dyskinesia. Tetrabenazine blocks uptake into adrenergic storage vesicles and has been used as a high affinity label for the vesicle transport system. [PubChem]
Harman is found in chicory. Harman is an alkaloid from the may pop (Passiflora incarnata, Passifloraceae) and many other Passiflora sp
Sucrose octaacetate is a flavouring ingredient, alcohol denaturan
5,6,7,8-Tetrahydro-2,4-dimethylquinoline is found in herbs and spices. 5,6,7,8-Tetrahydro-2,4-dimethylquinoline is an alkaloid from the roots of Glycyrrhiza uralensis (Chinese licorice
Heme is the color-furnishing portion of hemoglobin. It is found free in tissues and as the prosthetic group in many hemeproteins. A heme or haem is a prosthetic group that consists of an iron atom contained in the center of a large heterocyclic organic ring called a porphyrin. Not all porphyrins contain iron, but a substantial fraction of porphyrin-containing metalloproteins have heme as their prosthetic subunit; these are known as hemoproteins.
L-cis-3-Amino-2-pyrrolidinecarboxylic acid is found in mushrooms. L-cis-3-Amino-2-pyrrolidinecarboxylic acid is isolated from Morchella esculenta (common morel
Dicyclomine is only found in individuals that have used or taken this drug. It is a muscarinic antagonist used as an antispasmodic and in urinary incontinence. It has little effect on glandular secretion or the cardiovascular system. It does have some local anesthetic properties and is used in gastrointestinal, biliary, and urinary tract spasms. [PubChem]Action is achieved via a dual mechanism: (1) a specific anticholinergic effect (antimuscarinic) at the acetylcholine-receptor sites and (2) a direct effect upon smooth muscle (musculotropic).
Butalbital, 5-allyl-5-isobutylbarbituric acid, is a barbiturate with an intermediate duration of action. It has the same chemical formula as talbutal but a different structure. Butalbital is often combined with other medications, such as acetaminophen or aspirin, and is commonly prescribed for the treatment of pain and headache. [Wikipedia]
The chlorite ion is ClO2-. A chlorite (compound) is a compound that contains this group, with chlorine in oxidation state +3. Chlorites are also known as salts of chlorous acid.
Inverted or invert sugar syrup is a mixture of glucose and fructose; it is obtained by splitting sucrose into these two components. Compared with its precursor, sucrose, inverted sugar is sweeter and its products tend to remain more moist and are less prone to crystallisation. Inverted sugar is therefore valued by bakers, who refer to the syrup as trimoline or invert syrup. Invert sugar is found in fig and black elderberry.
5alpha-Cholestanone, also known as 5α-cholestanone, belongs to the class of organic compounds known as cholesterols and derivatives. Cholesterols and derivatives are compounds containing a 3-hydroxylated cholestane core. Thus, 5alpha-cholestanone is considered to be a sterol lipid molecule. 5alpha-Cholestanone is a very hydrophobic molecule, practically insoluble in water, and relatively neutral.
(2E,4E,6Z)-2,4,6-Decatrienoic acid dehydropiperidide is found in herbs and spices. (2E,4E,6Z)-2,4,6-Decatrienoic acid dehydropiperidide is an alkaloid from Achillea millefolium (yarrow).
4-Pyridoxolactone is a bacterial oxidation metabolite of vitamin B6 (KEGG).
Isopyridoxal is an active vitamer of the B6 complex in humans. (PMID 2208740). Vitamin B(6) is an essential component in human diet. (PMID 12686115). Vitamin B6 status (together with other vitamins from the B complex) is also related to Hyperhomocysteinemia, which has been linked to an increased risk for cardiovascular (CV) disease. (PMID 16407736).
Methyclothiazide is only found in individuals that have used or taken this drug. It is a thiazide diuretic with properties similar to those of hydrochlorothiazide. (From Martindale, The Extra Pharmacopoeia, 30th ed, p825)Methyclothiazide appears to block the active reabsorption of chloride and possibly sodium in the ascending loop of Henle, altering electrolyte transfer in the proximal tubule. This results in excretion of sodium, chloride, and water and, hence, diuresis. As a diuretic, methyclothiazide inhibits active chloride reabsorption at the early distal tubule via the Na-Cl cotransporter, resulting in an increase in the excretion of sodium, chloride, and water. Thiazides like methyclothiazide also inhibit sodium ion transport across the renal tubular epithelium through binding to the thiazide sensitive sodium-chloride transporter. This results in an increase in potassium excretion via the sodium-potassium exchange mechanism. The antihypertensive mechanism of methyclothiazide is less well understood although it may be mediated through its action on carbonic anhydrases in the smooth muscle or through its action on the large-conductance calcium-activated potassium (KCa) channel, also found in the smooth muscle.
Ridogrel is only found in individuals that have used or taken this drug. It is a dual action drug useful for the prevention of systemic thrombo-embolism and as an adjunctive agent to thrombolytic therapy in acute myocardial infarction. However, there currently are no clinical indications for preferential use of ridogrel over aspirin.Ridogrel inhibits thromboxane A2 synthase and also blocks the thromboxane A2/prostaglandin endoperoxide receptors. Thromboxane synthetase produces thromboxane in platelets. Thromboxane is a vasoconstrictor and facilitates the clumping of platelets. Therefore by inhibiting the production and promotion of thromboxane, thrombolysis is enhanced.
Fucose (CAS: 2438-80-4) is a hexose deoxy sugar with the chemical formula C6H12O5. L-Fucose (6-deoxy-L-galactose) is a monosaccharide that is a common component of many N- and O-linked glycans and glycolipids produced by mammalian cells. It is the fundamental subunit of the fucoidan polysaccharide. As a free sugar, L-fucose is normally found at very low levels in mammals. It is unique in that it is the only levorotatory sugar synthesized and utilized by mammals. Fucose polymers are synthesized by fucosyltransferases. All fucosyltransferases utilize a nucleotide-activated form of fucose, GDP-fucose, as a fucose donor in the construction of fucosylated oligosaccharides. The ABO blood group antigens are among the most well known fucosylated glycans. The alpha-1->3 linked core fucose is a suspected carbohydrate antigen for IgE-mediated allergy. Two structural features distinguish fucose from other six-carbon sugars present in mammals: the lack of a hydroxyl group on the carbon at the 6-position (C-6) and the L-configuration. In fucose-containing glycan structures, fucosylated glycans, fucose can exist as a terminal modification or serve as an attachment point for adding other sugars. Fucose is metabolized by an enzyme called alpha-fucosidase. Fucose is secreted in urine when the liver is damaged. Free L-fucose in serum and urine can be used as a marker for cancer, cirrhosis, alcoholic liver disease and gastric ulcers (PMID: 2311216, 8488966). Elevated levels of serum fucose have been reported in breast cancer, ovarian cancer, lung cancer, liver cancer, diabetes, and cardiovascular disease. It has been shown that feeding rats a diet high in L-fucose induces neuropathy similar to that seen in diabetics.
6-Methoxy-2(3H)-benzoxazolone is found in alcoholic beverages. 6-Methoxy-2(3H)-benzoxazolone is isolated from roots of Coix lacryma jobi (Job's tears) and from seedlings of wheat, corn and rye.
Dihydrocapsaicin is found in pepper (C. annuum). It is a potential nutriceutical. Dihydrocapsaicin is a capsaicinoid and analog and congener of capsaicin in chili peppers (Capsicum). Like capsaicin it is an irritant. Dihydrocapsaicin accounts for about 22% of the total capsaicinoids mixture and has about the same pungency as capsaicin. Pure dihydrocapsaicin is a lipophilic colorless odorless crystalline to waxy compound. It is soluble in dimethyl sulfoxide and 100 % ethanol.
Purine, also known as purine base or 1H-purine, belongs to the class of organic compounds known as purines and purine derivatives. These are aromatic heterocyclic compounds containing a purine moiety, which is formed a pyrimidine-ring ring fused to an imidazole ring. Two of the bases in nucleic acids, adenine and guanine, are purines. Purines from food (or from tissue turnover) are metabolised by several enzymes, including xanthine oxidase, into uric acid. Purine exists in all living species, ranging from bacteria to humans. High levels of uric acid can predispose to gout when the acid crystalises in joints; this phenomenon only happens in humans and some animal species (e.g. dogs) that lack an intrinsic uricase enzyme that can further degrade uric acid. In humans, purine is involved in thioguanine action pathway. Outside of the human body, purine is found, on average, in the highest concentration within cocoa beans. Purine has also been detected, but not quantified in several different foods, such as rapinis, plains prickly pears, blackcurrants, radish, and parsley. This could make purine a potential biomarker for the consumption of these foods. Purine is a heterocyclic aromatic organic compound, consisting of a pyrimidine ring fused to an imidazole ring.
p-Menthane is found in peppermint. p-Menthane is a flavouring compound [Goodscents
(-)-Menthone, also known as (1R,4S)-menthone or L-menthone, belongs to the class of organic compounds known as menthane monoterpenoids. These are monoterpenoids with a structure based on the o-, m-, or p-menthane backbone. P-menthane consists of the cyclohexane ring with a methyl group and a (2-methyl)-propyl group at the 1 and 4 ring position, respectively. The o- and m- menthanes are much rarer, and presumably arise by alkyl migration of p-menthanes. (-)-Menthone is a very hydrophobic molecule, practically insoluble in water, and relatively neutral. Thus, (-)-menthone is considered to be an isoprenoid lipid molecule.
7 alpha,26-Dihydroxy-4-cholesten-3-one is involved in primary bile acid biosynthesis. 7 alpha,26-Dihydroxy-4-cholesten-3-one is produced from 7 alpha,27-Dihydroxycholesterol through the action of HSD3B7 (EC:1.1.1.181). 7 alpha,26-Dihydroxy-4-cholesten-3-one can then be converted to 7 alpha-Hydroxy-3-oxo-4-cholestenoate by CYP27A (EC:1.14.13.15).
Praseodymium, also known as 59pr or praseodimio, is a member of the class of compounds known as homogeneous lanthanide compounds. Homogeneous lanthanide compounds are inorganic compounds containing only metal atoms, with the largest atom being a lanthanide atom. Praseodymium can be found in dill, red beetroot, romaine lettuce, and spinach, which makes praseodymium a potential biomarker for the consumption of these food products. Praseodymium always occurs naturally together with the other rare-earth metals. It is the fourth most common rare-earth element, making up 9.1 parts per million of the Earth's crust, an abundance similar to that of boron. In 1841, Swedish chemist Carl Gustav Mosander extracted a rare-earth oxide residue he called didymium from a residue he called "lanthana", in turn separated from cerium salts. In 1885, the Austrian chemist Baron Carl Auer von Welsbach separated didymium into two elements that gave salts of different colours, which he named praseodymium and neodymium. The name praseodymium comes from the Greek prasinos (πράσινος), meaning "green", and didymos (δίδυμος), "twin".
5a-Androstan-3b-ol is a steroidal compound belonging to the group of odorous 16-androstenes, first isolated from boar testes and also found in humans. 5a-Androstan-3b-ol has pheromone-like properties in both animals and humans, but the molecular targets of its pheromonal activity are unknown. 5a-Androstan-3b-ol as a pheromone is well suited because of high volatility and lipophilicity. (PMID: 1419890, 8142319, 16415088).
Oxalacetic acid, also known as oxaloacetic acid, keto-oxaloacetate or 2-oxobutanedioate, belongs to the class of organic compounds known as short-chain keto acids and derivatives. These are keto acids with an alkyl chain the contains less than 6 carbon atoms. Oxalacetic acid is a metabolic intermediate in many processes that occur in animals and plants. It takes part in gluconeogenesis, the urea cycle, the glyoxylate cycle, amino acid synthesis, fatty acid synthesis and the citric acid cycle. Oxalacetic acid exists in all living species, ranging from bacteria to plants to humans. Within humans, oxalacetic acid participates in a number of enzymatic reactions. In particular, oxalacetic acid is an intermediate of the citric acid cycle, where it reacts with acetyl-CoA to form citrate, catalyzed by citrate synthase. It is also involved in gluconeogenesis and the urea cycle. In gluconeogenesis oxaloacetate is decarboxylated and phosphorylated by phosphoenolpyruvate carboxykinase and becomes 2-phosphoenolpyruvate using guanosine triphosphate (GTP) as phosphate source. In the urea cycle, malate is acted on by malate dehydrogenase to become oxaloacetate, producing a molecule of NADH. After that, oxaloacetate can be recycled to aspartate, as this recycling maintains the flow of nitrogen into the cell. In mice, injections of oxalacetic acid have been shown to promote brain mitochondrial biogenesis, activate the insulin signaling pathway, reduce neuroinflammation and activate hippocampal neurogenesis (PMID: 25027327). Oxalacetic acid has also been reported to reduce hyperglycemia in type II diabetes and to extend longevity in C. elegans (PMID: 25027327). Outside of the human body, oxalacetic acid has been detected, but not quantified in, several different foods, such as Persian limes, lemon balms, wild rice, canola, and peanuts. This could make oxalacetic acid a potential biomarker for the consumption of these foods.
16-alpha-hydroxypregnenolone, also known as 16A OH-Preg or (3beta,16alpha)-3,16-dihydroxypregn-5-en-20-one, is classified as a gluco/mineralocorticoid, a progestogin or aprogestogin derivative. Gluco/mineralocorticoids are steroids with a structure based on a hydroxylated prostane moiety. Thus, 16-alpha-hydroxypregnenolone is a steroid or more correctly a 16alpha-hydroxy steroid. 16-alpha-hydroxypregnenolone is also classified as a hydroxypregnenolone. A hydroxypregnenolone is a pregnenolone substituted by an alpha-hydroxy group at position 16. It is a steroid molecule that is produced by all vertebrates. In humans, 16-alpha-hydroxypregnenolone can be found primarily in blood, urine and in human umbilical cord tissue. 16-alpha-Hydroxypregnenolone is a normal urinary metabolite with increased total excretion in newborn infants with congenital adrenal hyperplasia due to 21-hydroxylase deficiency (PMID 6980322). It is therefore an important urinary marker for the occurrence of an adrenal 21-hydroxylase-deficiency. Its levels are an indication for the effectiveness of medication (cortisol supplement) against this disease. (PMID: 10399855).
N-Desalkyl flurazepam is a metabolite of flurazepam. Flurazepam (marketed under the brand names Dalmane and Dalmadorm) is a drug which is a benzodiazepine derivative. It possesses anxiolytic, anticonvulsant, sedative and skeletal muscle relaxant properties. It produces a metabolite with a very long half-life (40–250 hours), which may stay in the bloodstream for up to four days. http://www. non-benzodiazepines. org. uk/equivalents. html Flurazepam is therefore unsuitable as a sleeping medication for some individuals due to next day sedation. (Wikipedia)
2,5-Dimethylphenol is found in alcoholic beverages. 2,5-Dimethylphenol is present in coffee and whisky. 2,5-Dimethylphenol is a flavouring ingredien
Oxazepam glucuronide belongs to the family of Glucuronic Acid Derivatives. These are compounds containing a glucuronic acid moeity (or a derivative), which consists of a glucose moiety with the C6 carbon oxidized to a carboxylic acid.
Prilocaine is only found in individuals that have used or taken this drug. It is a local anesthetic that is similar pharmacologically to lidocaine. Currently, it is used most often for infiltration anesthesia in dentistry. (From AMA Drug Evaluations Annual, 1992, p165)Prilocaine acts on sodium channels on the neuronal cell membrane, limiting the spread of seizure activity and reducing seizure propagation. The antiarrhythmic actions are mediated through effects on sodium channels in Purkinje fibers.
3-(Cystein-S-yl)acetaminophen is a member of the class of compounds known as L-cysteine-S-conjugates. L-Cysteine-S-conjugates are compounds containing L-cysteine where the thio-group is conjugated.
Homoveratric acid is the main metabolite of 3,4-dimethoxyphenylethylamine (DMPEA) in urine. It has been suggested that DMPEA and other amines are in higher concentrations in drug-free schizophrenics than in normal subjects. DMPEA is a the di-methylated metabolite of L-DOPA, the major treatment for Parkinson's disease (PD). (PMID 7059639, 14311254, 588645, 10834300).
Protopine is a benzylisoquinoline alkaloid occurring in opium poppies and other plants of the family papaveraceae. It has been found to inhibit histamine H1 receptors and platelet aggregation, and acts as an opioid analgesic.
Orthoperiodic acid is found in milk and milk products. Sterilizing agent for containers and devices used in milk production Periodic acid, or iodic(VII) acid is an oxoacid of iodine having chemical formula HIO4 or H5IO6
Nicergoline is only found in individuals that have used or taken this drug. It is an ergot derivative that has been used as a cerebral vasodilator and in peripheral vascular disease. It has been suggested to ameliorate cognitive deficits in cerebrovascular disease. [PubChem]Nicergoline acts by inhibiting the postsynaptic alpha(1)-adrenoceptors on vascular smooth muscle. This inhibits the vasoconstrictor effect of circulating and locally released catecholamines (epinephrine and norepinephrine), resulting in peripheral vasodilation. Therefore the mechanism of Nicergoline is to increase vascular circulation in the brain, thereby enhancing the transmission of nerve signals across the nerve fibres, which secrete acetylcholine as a neural transmitter.
It is used in foods as a binder, emulsifier and anticaking agent
Polyoxyethylene 40 monostearate is used as a food additive [EAFUS] ("EAFUS: Everything Added to Food in the United States. [http://www.eafus.com/]")
(-)-Nopol is found in root vegetables. (-)-Nopol is present in carrots. (-)-Nopol is a flavouring agent for baked goods and candie
2-Nonanone is found in alcoholic beverages. 2-Nonanone is present in banana, ginger, Brazil nut, attar of rose, clove oil, coconut oil, passionflower, sorghum, asparagus, tomato, corn, wine, cheese, beer, blackcurrant buds, melon, and strawberry jam. 2-Nonanone is a flavor and fragrance agent. It is a clear slightly yellow liquid. Ketones, such as 2-Nonanone, are reactive with many acids and bases liberating heat and flammable gases (e.g., H2). The amount of heat may be sufficient to start a fire in the unreacted portion of the ketone. Ketones react with reducing agents such as hydrides, alkali metals, and nitrides to produce flammable gas (H2) and heat.
Diisobutylcarbinol is a flavouring ingredien
Cinoxacin is only found in individuals that have used or taken this drug. It is a synthetic antimicrobial related to oxolinic acid and nalidixic acid and used in urinary tract infections. [PubChem]Evidence exists that cinoxacin binds strongly, but reversibly, to DNA, interfering with synthesis of RNA and, consequently, with protein synthesis. It appears to also inhibit DNA gyrase. This enzyme is necessary for proper replicated DNA separation. By inhibiting this enzyme, DNA replication and cell division is inhibited.
Indole-5,6-quinone is involved in the tyrosine metabolism pathway. More specifically, indole-5,6-quinone is an intermediate in the production of melanin. Indole-5,6-quinone is produced from 5,6-dihydroxyindole by tyrosinase [EC:1.14.18.1].
4'-Hydroxydiclofenac is only found in individuals that have used or taken Diclofenac. 4'-Hydroxydiclofenac is a metabolite of Diclofenac. 4'-hydroxydiclofenac belongs to the family of Phenylacetic Acid Derivatives. These are compounds containing a phenylacetic acid moiety, which consists of a phenyl group substituted at the second position by an acetic acid.
2,4-Dihydroxybenzoic acid is found in alcoholic beverages. 2,4-Dihydroxybenzoic acid is found in avocado, beer, wine and coffee. 2,4-Dihydroxybenzoic acid is a food flavour ingredient and flavour modifie
A class I anti-arrhythmic agent (one that interferes directly with the depolarization of the cardiac membrane and thus serves as a membrane-stabilizing agent) with a depressant action on the heart similar to that of guanidine. It also possesses some anticholinergic and local anesthetic properties. [PubChem]
2(R)-Hydroxydocosanoic acid is a long-chain hydroxy fatty acid. In humans fatty acids are predominantly formed in the liver and adipose tissue, and mammary glands during lactation.
3-Hexaprenyl-4,5-Dihydroxybenzoic acid is an intermediate in the biosynthesis of Ubiquinone. It is a substrate for Hexaprenyldihydroxybenzoate methyltransferase (mitochondrial).
Cervonyl carnitine is an acylcarnitine. Numerous disorders have been described that lead to disturbances in energy production and in intermediary metabolism in the organism which are characterized by the production and excretion of unusual acylcarnitines. A mutation in the gene coding for carnitine-acylcarnitine translocase or the OCTN2 transporter aetiologically causes a carnitine deficiency that results in poor intestinal absorption of dietary L-carnitine, its impaired reabsorption by the kidney and, consequently, in increased urinary loss of L-carnitine. Determination of the qualitative pattern of acylcarnitines can be of diagnostic and therapeutic importance. The betaine structure of carnitine requires special analytical procedures for recording. The ionic nature of L-carnitine causes a high water solubility which decreases with increasing chain length of the ester group in the acylcarnitines. Therefore, the distribution of L-carnitine and acylcarnitines in various organs is defined by their function and their physico-chemical properties as well. High performance liquid chromatography (HPLC) permits screening for free and total carnitine, as well as complete quantitative acylcarnitine determination, including the long-chain acylcarnitine profile. (PMID: 17508264, Monatshefte fuer Chemie (2005), 136(8), 1279-1291., Int J Mass Spectrom. 1999;188:39-52.).
CDP-DG(18:1(11Z)/18:2(9Z,12Z)) is a cytidine diphosphate diacylglycerol or CDP-diacylglycerol. CDP-diacylglycerol (CDP-DG) is an important branchpoint intermediate in eukaryotic phospholipid biosynthesis and could be a key regulatory molecule in phospholipid metabolism. It is a glycerophospholipid in which a cytidine diphosphate moiety occupies a glycerol substitution site. As is the case with diacylglycerols, CDP-diacylglycerols can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. CDP-DG(18:1(11Z)/18:2(9Z,12Z)), in particular, consists of one chain of vaccenic acid at the C-1 position and one chain of linoleic acid at the C-2 position. The vaccenic acid moiety is derived from butter fat and animal fat, while the linoleic acid moiety is derived from seed oils. CDP-diacylglycerols are intermediates in the synthesis of phosphatidylglycerols (PG, PC, PS, PI), which is catalyzed by CDP-diacyl synthase, synthase, phosphatidylglycerolphosphate (PGP) synthase, phosphatidylinositol (PI) synthase, and phosphatidylserine (PS) synthase. Cytidine diphosphate diacylglycerols are rarely noticed in analyses of lipid compositions of tissues, as they are present is such small amounts, perhaps only 0.05% or so of the total phospholipids.
PC(18:4(6Z,9Z,12Z,15Z)/20:4(5Z,8Z,11Z,14Z)) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(18:4(6Z,9Z,12Z,15Z)/20:4(5Z,8Z,11Z,14Z)), in particular, consists of one chain of stearidonic acid at the C-1 position and one chain of arachidonic acid at the C-2 position. The stearidonic acid moiety is derived from seed oils, while the arachidonic acid moiety is derived from animal fats and eggs. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
PE(16:0/20:4(5Z,8Z,11Z,14Z)) is a phosphatidylethanolamine (PE or GPEtn). It is a glycerophospholipid in which a phosphorylethanolamine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphoethanolamines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PE(16:0/20:4(5Z,8Z,11Z,14Z)), in particular, consists of one chain of palmitic acid at the C-1 position and one chain of arachidonic acid at the C-2 position. The palmitic acid moiety is derived from fish oils, milk fats, vegetable oils and animal fats, while the arachidonic acid moiety is derived from animal fats and eggs. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PEs are neutral zwitterions at physiological pH. They mostly have palmitic or stearic acid on carbon 1 and a long chain unsaturated fatty acid (e.g. 18:2, 20:4 and 22:6) on carbon 2. PE synthesis can occur via two pathways. The first requires that ethanolamine be activated by phosphorylation and then coupled to CDP. The ethanolamine is then transferred from CDP-ethanolamine to phosphatidic acid to yield PE. The second involves the decarboxylation of PS.
PE(18:1(11Z)/22:6(4Z,7Z,10Z,13Z,16Z,19Z)) is a phosphatidylethanolamine (PE or GPEtn). It is a glycerophospholipid in which a phosphorylethanolamine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphoethanolamines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PE(18:1(11Z)/22:6(4Z,7Z,10Z,13Z,16Z,19Z)), in particular, consists of one chain of vaccenic acid at the C-1 position and one chain of docosahexaenoic acid at the C-2 position. The vaccenic acid moiety is derived from butter fat and animal fat, while the docosahexaenoic acid moiety is derived from fish oils. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PEs are neutral zwitterions at physiological pH. They mostly have palmitic or stearic acid on carbon 1 and a long chain unsaturated fatty acid (e.g. 18:2, 20:4 and 22:6) on carbon 2. PE synthesis can occur via two pathways. The first requires that ethanolamine be activated by phosphorylation and then coupled to CDP. The ethanolamine is then transferred from CDP-ethanolamine to phosphatidic acid to yield PE. The second involves the decarboxylation of PS.
PE(20:0/22:5(7Z,10Z,13Z,16Z,19Z)) is a phosphatidylethanolamine (PE or GPEtn). It is a glycerophospholipid in which a phosphorylethanolamine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphoethanolamines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PE(20:0/22:5(7Z,10Z,13Z,16Z,19Z)), in particular, consists of one chain of arachidic acid at the C-1 position and one chain of docosapentaenoic acid at the C-2 position. The arachidic acid moiety is derived from peanut oil, while the docosapentaenoic acid moiety is derived from fish oils. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PEs are neutral zwitterions at physiological pH. They mostly have palmitic or stearic acid on carbon 1 and a long chain unsaturated fatty acid (e.g. 18:2, 20:4 and 22:6) on carbon 2. PE synthesis can occur via two pathways. The first requires that ethanolamine be activated by phosphorylation and then coupled to CDP. The ethanolamine is then transferred from CDP-ethanolamine to phosphatidic acid to yield PE. The second involves the decarboxylation of PS.
PIP(16:0/18:1(11Z)) is a phosphatidylinositol phosphate. Phosphatidylinositol phosphates are acidic (anionic) phospholipids that consist of a phosphatidic acid backbone, linked via the phosphate group to a phosphorylated inositol (hexahydroxycyclohexane). Phosphatidylinositol phosphates are generated from phosphatidylinositols, which are phosphorylated by a number of different kinases that place the phosphate moiety on positions 4 and 5 of the inositol ring, although position 3 can also be phosphorylated. Phosphatidylinositols phosphates can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 18 and 20 carbons are the most common. PIP(16:0/18:1(11Z)), in particular, consists of one chain of palmitic acid at the C-1 position and one chain of vaccenic acid at the C-2 position. The palmitic acid moiety is derived from fish oils, milk fats, vegetable oils and animal fats, while the vaccenic acid moiety is derived from butter fat and animal fat. The most important phosphatidylinositol phosphate in both quantitative and biological terms is phosphatidylinositol 4-phosphate. Phosphatidylinositol and the phosphatidylinositol phosphates are the main source of diacylglycerols that serve as signaling molecules, via the action of phospholipase C enzymes. Phosphatidylinositols phosphates are usually present at low levels only in tissues, typically at about 1 to 3% of the concentration of phosphatidylinositol.
LysoPC(18:3(6Z,9Z,12Z)) is a lysophospholipid (LyP). It is a monoglycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. Lysophosphatidylcholines can have different combinations of fatty acids of varying lengths and saturation attached at the C-1 (sn-1) position. Fatty acids containing 16, 18 and 20 carbons are the most common. LysoPC(18:3(6Z,9Z,12Z)), in particular, consists of one chain of g-linolenic acid at the C-1 position. The g-linolenic acid moiety is derived from animal fats. Lysophosphatidylcholine is found in small amounts in most tissues. It is formed by hydrolysis of phosphatidylcholine by the enzyme phospholipase A2, as part of the de-acylation/re-acylation cycle that controls its overall molecular species composition. It can also be formed inadvertently during extraction of lipids from tissues if the phospholipase is activated by careless handling. In blood plasma significant amounts of lysophosphatidylcholine are formed by a specific enzyme system, lecithin:cholesterol acyltransferase (LCAT), which is secreted from the liver. The enzyme catalyzes the transfer of the fatty acids of position sn-2 of phosphatidylcholine to the free cholesterol in plasma, with formation of cholesterol esters and lysophosphatidylcholine. Lysophospholipids have a role in lipid signaling by acting on lysophospholipid receptors (LPL-R). LPL-R's are members of the G protein-coupled receptor family of integral membrane proteins.
LysoPE(16:1(9Z)/0:0) is a lysophosphatidylethanolamine or a lysophospholipid. The term 'lysophospholipid' (LPL) refers to any phospholipid that is missing one of its two O-acyl chains. Thus, LPLs have a free alcohol in either the sn-1 or sn-2 position. The prefix 'lyso-' comes from the fact that lysophospholipids were originally found to be hemolytic however it is now used to refer generally to phospholipids missing an acyl chain. LPLs are usually the result of phospholipase A-type enzymatic activity on regular phospholipids such as phosphatidylcholine or phosphatidic acid, although they can also be generated by the acylation of glycerophospholipids or the phosphorylation of monoacylglycerols. Some LPLs serve important signaling functions such as lysophosphatidic acid. Lysophosphatidylethanolamines (LPEs) can function as plant growth regulators with several diverse uses. (LPEs) are approved for outdoor agricultural use to accelerate ripening and improve the quality of fresh produce. They are also approved for indoor use to preserve stored crops and commercial cut flowers. As a breakdown product of phosphatidylethanolamine (PE), LPE is present in cells of all organisms.
CDP-DG(16:0/18:1(11Z)) is a cytidine diphosphate diacylglycerol or CDP-diacylglycerol. CDP-diacylglycerol (CDP-DG) is an important branchpoint intermediate in eukaryotic phospholipid biosynthesis and could be a key regulatory molecule in phospholipid metabolism. It is a glycerophospholipid in which a cytidine diphosphate moiety occupies a glycerol substitution site. As is the case with diacylglycerols, CDP-diacylglycerols can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. CDP-DG(16:0/18:1(11Z)), in particular, consists of one chain of palmitic acid at the C-1 position and one chain of vaccenic acid at the C-2 position. The palmitic acid moiety is derived from fish oils, milk fats, vegetable oils and animal fats, while the vaccenic acid moiety is derived from butter fat and animal fat. CDP-diacylglycerols are intermediates in the synthesis of phosphatidylglycerols (PG, PC, PS, PI), which is catalyzed by CDP-diacyl synthase, synthase, phosphatidylglycerolphosphate (PGP) synthase, phosphatidylinositol (PI) synthase, and phosphatidylserine (PS) synthase. Cytidine diphosphate diacylglycerols are rarely noticed in analyses of lipid compositions of tissues, as they are present is such small amounts, perhaps only 0.05% or so of the total phospholipids.
DG(14:0/20:1(11Z)/0:0) is a diglyceride, or a diacylglycerol (DAG). It is a glyceride consisting of two fatty acid chains covalently bonded to a glycerol molecule through ester linkages. Diacylglycerols can have many different combinations of fatty acids attached at both the C-1 and C-2 positions. DG(14:0/20:1(11Z)/0:0), in particular, consists of one chain of myristic acid at the C-1 position and one chain of eicosenoic acid at the C-2 position. The myristic acid moiety is derived from nutmeg and butter, while the eicosenoic acid moiety is derived from vegetable oils and cod oils. Mono- and diacylglycerols are common food additives used to blend together certain ingredients, such as oil and water, which would not otherwise blend well. Dacylglycerols are often found in bakery products, beverages, ice cream, chewing gum, shortening, whipped toppings, margarine, and confections. Synthesis of diacylglycerol begins with glycerol-3-phosphate, which is derived primarily from dihydroxyacetone phosphate, a product of glycolysis (usually in the cytoplasm of liver or adipose tissue cells). Glycerol-3-phosphate is first acylated with acyl-coenzyme A (acyl-CoA) to form lysophosphatidic acid, which is then acylated with another molecule of acyl-CoA to yield phosphatidic acid. Phosphatidic acid is then de-phosphorylated to form diacylglycerol.Diacylglycerols are precursors to triacylglycerols (triglyceride), which are formed by the addition of a third fatty acid to the diacylglycerol under the catalysis of diglyceride acyltransferase. Since diacylglycerols are synthesized via phosphatidic acid, they will usually contain a saturated fatty acid at the C-1 position on the glycerol moiety and an unsaturated fatty acid at the C-2 position.
PC(18:1(9Z)/18:1(9Z)) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(18:1(9Z)/18:1(9Z)), in particular, consists of two chains of oleic acid at the C-1 and C-2 positions. The oleic acid moieties are derived from vegetable oils, especially olive and canola oil. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling. Dioleoylphosphatidylcholine is found in human platelets and red blood cells, in mitochondria from skeletal muscle, lung, umbilical artery and vein endothelial cells (PMID: 15351277, 7138900, 2351875, 4046747, 2755318).While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
LysoPE(18:3(6Z,9Z,12Z)/0:0) is a lysophosphatidylethanolamine or a lysophospholipid. The term 'lysophospholipid' (LPL) refers to any phospholipid that is missing one of its two O-acyl chains. Thus, LPLs have a free alcohol in either the sn-1 or sn-2 position. The prefix 'lyso-' comes from the fact that lysophospholipids were originally found to be hemolytic however it is now used to refer generally to phospholipids missing an acyl chain. LPLs are usually the result of phospholipase A-type enzymatic activity on regular phospholipids such as phosphatidylcholine or phosphatidic acid, although they can also be generated by the acylation of glycerophospholipids or the phosphorylation of monoacylglycerols. Some LPLs serve important signaling functions such as lysophosphatidic acid. Lysophosphatidylethanolamines (LPEs) can function as plant growth regulators with several diverse uses. (LPEs) are approved for outdoor agricultural use to accelerate ripening and improve the quality of fresh produce. They are also approved for indoor use to preserve stored crops and commercial cut flowers. As a breakdown product of phosphatidylethanolamine (PE), LPE is present in cells of all organisms.
PE(DiMe(11,3)/DiMe(9,3)) is a phosphatidylethanolamine (PE or GPEtn). It is a glycerophospholipid in which a phosphorylethanolamine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphoethanolamines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PE(DiMe(11,3)/DiMe(9,3)), in particular, consists of one chain of 12,15-epoxy-13,14-dimethyleicosa-12,14-dienoic at the C-1 position and one chain of 10,13-epoxy-11-methylhexadeca-10,12-dienoic acid at the C-2 position. The 12,15-epoxy-13,14-dimethyleicosa-12,14-dienoic moiety is derived from fish oil, while the 10,13-epoxy-11-methylhexadeca-10,12-dienoic acid moiety is derived from fish oil. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling. While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PEs are neutral zwitterions at physiological pH. They mostly have palmitic or stearic acid on carbon 1 and a long chain unsaturated fatty acid (e.g. 18:2, 20:4 and 22:6) on carbon 2. PE synthesis can occur via two pathways. The first requires that ethanolamine be activated by phosphorylation and then coupled to CDP. The ethanolamine is then transferred from CDP-ethanolamine to phosphatidic acid to yield PE. The second involves the decarboxylation of PS.
LysoPE(0:0/20:3(5Z,8Z,11Z)) is a lysophosphatidylethanolamine or a lysophospholipid. The term 'lysophospholipid' (LPL) refers to any phospholipid that is missing one of its two O-acyl chains. Thus, LPLs have a free alcohol in either the sn-1 or sn-2 position. The prefix 'lyso-' comes from the fact that lysophospholipids were originally found to be hemolytic however it is now used to refer generally to phospholipids missing an acyl chain. LPLs are usually the result of phospholipase A-type enzymatic activity on regular phospholipids such as phosphatidylcholine or phosphatidic acid, although they can also be generated by the acylation of glycerophospholipids or the phosphorylation of monoacylglycerols. Some LPLs serve important signaling functions such as lysophosphatidic acid. Lysophosphatidylethanolamines (LPEs) can function as plant growth regulators with several diverse uses. (LPEs) are approved for outdoor agricultural use to accelerate ripening and improve the quality of fresh produce. They are also approved for indoor use to preserve stored crops and commercial cut flowers. As a breakdown product of phosphatidylethanolamine (PE), LPE is present in cells of all organisms.
PE(16:0/22:5(4Z,7Z,10Z,13Z,16Z)) is a phosphatidylethanolamine (PE or GPEtn). It is a glycerophospholipid in which a phosphorylethanolamine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphoethanolamines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PE(16:0/22:5(4Z,7Z,10Z,13Z,16Z)), in particular, consists of one chain of palmitic acid at the C-1 position and one chain of docosapentaenoic acid at the C-2 position. The palmitic acid moiety is derived from fish oils, milk fats, vegetable oils and animal fats, while the docosapentaenoic acid moiety is derived from animal fats and brain. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PEs are neutral zwitterions at physiological pH. They mostly have palmitic or stearic acid on carbon 1 and a long chain unsaturated fatty acid (e.g. 18:2, 20:4 and 22:6) on carbon 2. PE synthesis can occur via two pathways. The first requires that ethanolamine be activated by phosphorylation and then coupled to CDP. The ethanolamine is then transferred from CDP-ethanolamine to phosphatidic acid to yield PE. The second involves the decarboxylation of PS.
PC(14:0/20:2(11Z,14Z)) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(14:0/20:2(11Z,14Z)), in particular, consists of one chain of myristic acid at the C-1 position and one chain of eicosadienoic acid at the C-2 position. The myristic acid moiety is derived from nutmeg and butter, while the eicosadienoic acid moiety is derived from fish oils and liver. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
LysoPE(20:4(8Z,11Z,14Z,17Z)/0:0) is a lysophosphatidylethanolamine or a lysophospholipid. The term 'lysophospholipid' (LPL) refers to any phospholipid that is missing one of its two O-acyl chains. Thus, LPLs have a free alcohol in either the sn-1 or sn-2 position. The prefix 'lyso-' comes from the fact that lysophospholipids were originally found to be hemolytic however it is now used to refer generally to phospholipids missing an acyl chain. LPLs are usually the result of phospholipase A-type enzymatic activity on regular phospholipids such as phosphatidylcholine or phosphatidic acid, although they can also be generated by the acylation of glycerophospholipids or the phosphorylation of monoacylglycerols. Some LPLs serve important signaling functions such as lysophosphatidic acid. Lysophosphatidylethanolamines (LPEs) can function as plant growth regulators with several diverse uses. (LPEs) are approved for outdoor agricultural use to accelerate ripening and improve the quality of fresh produce. They are also approved for indoor use to preserve stored crops and commercial cut flowers. As a breakdown product of phosphatidylethanolamine (PE), LPE is present in cells of all organisms.
LysoPE(20:3(11Z,14Z,17Z)/0:0) or LPE(20:3(11Z,14Z,17Z)/0:0) is a lysophospholipid. The term 'lysophospholipid' (LPL) refers to any phospholipid that is missing one of its two O-acyl chains. Thus, LPLs have a free alcohol in either the sn-1 or sn-2 position. The prefix 'lyso-' comes from the fact that lysophospholipids were originally found to be hemolytic however it is now used to refer generally to phospholipids missing an acyl chain. LPLs are usually the result of phospholipase A-type enzymatic activity on regular phospholipids such as phosphatidylcholine or phosphatidic acid, although they can also be generated by the acylation of glycerophospholipids or the phosphorylation of monoacylglycerols. Some LPLs serve important signaling functions such as lysophosphatidic acid. Lysophosphatidylethanolamines (LPEs) can function as plant growth regulators with several diverse uses. (LPEs) are approved for outdoor agricultural use to accelerate ripening and improve the quality of fresh produce. They are also approved for indoor use to preserve stored crops and commercial cut flowers. As a breakdown product of phosphatidylethanolamine (PE), LPE is present in cells of all organisms.
PC(14:0/20:4(5Z,8Z,11Z,14Z)) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(14:0/20:4(5Z,8Z,11Z,14Z)), in particular, consists of one chain of myristic acid at the C-1 position and one chain of arachidonic acid at the C-2 position. The myristic acid moiety is derived from nutmeg and butter, while the arachidonic acid moiety is derived from animal fats and eggs. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
PC(18:2(9Z,12Z)/14:0) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(18:2(9Z,12Z)/14:0), in particular, consists of one chain of linoleic acid at the C-1 position and one chain of myristic acid at the C-2 position. The linoleic acid moiety is derived from seed oils, while the myristic acid moiety is derived from nutmeg and butter. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
PE(DiMe(11,3)/DiMe(11,3)) is a phosphatidylethanolamine (PE or GPEtn). It is a glycerophospholipid in which a phosphorylethanolamine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphoethanolamines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PE(DiMe(11,3)/DiMe(11,3)), in particular, consists of two chains of 12,15-epoxy-13,14-dimethyleicosa-12,14-dienoic at the C-1 and C-2 positions. The 12,15-epoxy-13,14-dimethyleicosa-12,14-dienoic moieties are derived from fish oil. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling. While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PEs are neutral zwitterions at physiological pH. They mostly have palmitic or stearic acid on carbon 1 and a long chain unsaturated fatty acid (e.g. 18:2, 20:4 and 22:6) on carbon 2. PE synthesis can occur via two pathways. The first requires that ethanolamine be activated by phosphorylation and then coupled to CDP. The ethanolamine is then transferred from CDP-ethanolamine to phosphatidic acid to yield PE. The second involves the decarboxylation of PS.
PE(18:0/20:2(11Z,14Z)) is a phosphatidylethanolamine (PE or GPEtn). It is a glycerophospholipid in which a phosphorylethanolamine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphoethanolamines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PE(18:0/20:2(11Z,14Z)), in particular, consists of one chain of stearic acid at the C-1 position and one chain of eicosadienoic acid at the C-2 position. The stearic acid moiety is derived from animal fats, coco butter and sesame oil, while the eicosadienoic acid moiety is derived from fish oils and liver. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PEs are neutral zwitterions at physiological pH. They mostly have palmitic or stearic acid on carbon 1 and a long chain unsaturated fatty acid (e.g. 18:2, 20:4 and 22:6) on carbon 2. PE synthesis can occur via two pathways. The first requires that ethanolamine be activated by phosphorylation and then coupled to CDP. The ethanolamine is then transferred from CDP-ethanolamine to phosphatidic acid to yield PE. The second involves the decarboxylation of PS.
Sphingomyelin (d18:0/20:2(11Z,14Z)) or SM(d18:0/20:2(11Z,14Z)) is a type of sphingolipid found in animal cell membranes, especially in the membranous myelin sheath which surrounds some nerve cell axons. It usually consists of phosphorylcholine and ceramide. In humans, sphingomyelin is the only membrane phospholipid not derived from glycerol. Like all sphingolipids, SPH has a ceramide core (sphingosine bonded to a fatty acid via an amide linkage). In addition it contains one polar head group, which is either phosphocholine or phosphoethanolamine. The plasma membrane of cells is highly enriched in sphingomyelin and is considered largely to be found in the exoplasmic leaflet of the cell membrane. However, there is some evidence that there may also be a sphingomyelin pool in the inner leaflet of the membrane. Moreover, neutral sphingomyelinase-2 - an enzyme that breaks down sphingomyelin into ceramide has been found to localise exclusively to the inner leaflet further suggesting that there may be sphingomyelin present there. Sphingomyelin can accumulate in a rare hereditary disease called Niemann-Pick Disease, types A and B. Niemann-Pick disease is a genetically-inherited disease caused by a deficiency in the enzyme Sphingomyelinase, which causes the accumulation of Sphingomyelin in spleen, liver, lungs, bone marrow, and the brain, causing irreversible neurological damage. SMs play a role in signal transduction. Sphingomyelins are synthesized by the transfer of phosphorylcholine from phosphatidylcholine to a ceramide in a reaction catalyzed by sphingomyelin synthase.
PC(18:3(6Z,9Z,12Z)/20:4(5Z,8Z,11Z,14Z)) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(18:3(6Z,9Z,12Z)/20:4(5Z,8Z,11Z,14Z)), in particular, consists of one chain of g-linolenic acid at the C-1 position and one chain of arachidonic acid at the C-2 position. The g-linolenic acid moiety is derived from animal fats, while the arachidonic acid moiety is derived from animal fats and eggs. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
PA(22:0/PGJ2) is an oxidized phosphatidic acid (PA). Oxidized phosphatidic acids are glycerophospholipids in which a phosphate moiety occupies a glycerol substitution site and at least one of the fatty acyl chains has undergone oxidation. As all oxidized lipids, oxidized phosphatidic acids belong to a group of biomolecules that have a role as signaling molecules. The biosynthesis of oxidized lipids is mediated by several enzymatic families, including cyclooxygenases (COX), lipoxygenases (LOX) and cytochrome P450s (CYP). Non-enzymatically oxidized lipids are produced by uncontrolled oxidation through free radicals and are considered harmful to human health (PMID: 33329396). As is the case with diacylglycerols, phosphatidic acids can have many different combinations of fatty acids of varying lengths, saturation and degrees of oxidation attached at the C-1 and C-2 positions. PA(22:0/PGJ2), in particular, consists of one chain of one docosanoyl at the C-1 position and one chain of Prostaglandin J2 at the C-2 position. Phospholipids are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling. Similarly to what occurs with phospholipids, the fatty acid distribution at the C-1 and C-2 positions of glycerol within oxidized phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. Oxidized PAs can be synthesized via three different routes. In one route, the oxidized PA is synthetized de novo following the same mechanisms as for PAs but incorporating oxidized acyl chains (PMID: 33329396). An alternative is the transacylation of one of the non-oxidized acyl chains with an oxidized acylCoA (PMID: 33329396). The third pathway results from the oxidation of the acyl chain while still attached to the PA backbone, mainly through the action of LOX (PMID: 33329396).
Sphingomyelin (d18:2(4E,14Z)/20:0) or SM(d18:2(4E,14Z)/20:0) is a type of sphingolipid found in animal cell membranes, especially in the membranous myelin sheath which surrounds some nerve cell axons. It usually consists of phosphorylcholine and ceramide. SM(d18:2(4E,14Z)/20:0) consists of a sphinga-4E,14Z-dienine backbone and an arachidic acid chain. In humans, sphingomyelin is the only membrane phospholipid not derived from glycerol. Like all sphingolipids, SM has a ceramide core (sphingosine bonded to a fatty acid via an amide linkage). In addition, it contains one polar head group, which is either phosphocholine or phosphoethanolamine. The plasma membrane of cells is highly enriched in sphingomyelin and is considered largely to be found in the exoplasmic leaflet of the cell membrane. However, there is some evidence that there may also be a sphingomyelin pool in the inner leaflet of the membrane. Moreover, neutral sphingomyelinase-2, an enzyme that breaks down sphingomyelin into ceramide, has been found to localize exclusively to the inner leaflet further suggesting that there may be sphingomyelin present there. Sphingomyelin can accumulate in a rare hereditary disease called Niemann-Pick Disease, types A and B. Niemann-Pick disease is a genetically-inherited disease caused by a deficiency in the enzyme sphingomyelinase, which causes the accumulation of sphingomyelin in spleen, liver, lungs, bone marrow, and the brain, causing irreversible neurological damage. SMs play a role in signal transduction. Sphingomyelins are synthesized by the transfer of phosphorylcholine from phosphatidylcholine to a ceramide in a reaction catalyzed by sphingomyelin synthase.
PC(14:0/22:1(13Z)) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(14:0/22:1(13Z)), in particular, consists of one chain of myristic acid at the C-1 position and one chain of erucic acid at the C-2 position. The myristic acid moiety is derived from nutmeg and butter, while the erucic acid moiety is derived from seed oils and avocados. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
PA(22:0/22:6(4Z,7Z,10Z,13Z,16Z,19Z)) is a phosphatidic acid. It is a glycerophospholipid in which a phosphate moiety occupies a glycerol substitution site. As is the case with diacylglycerols, phosphatidic acids can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PA(22:0/22:6(4Z,7Z,10Z,13Z,16Z,19Z)), in particular, consists of one chain of behenic acid at the C-1 position and one chain of docosahexaenoic acid at the C-2 position. Phosphatidic acids are quite rare but are extremely important as intermediates in the biosynthesis of triacylglycerols and phospholipids.
PE(DiMe(11,3)/DiMe(11,3)) is a phosphatidylethanolamine (PE or GPEtn). It is a glycerophospholipid in which a phosphorylethanolamine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphoethanolamines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PE(DiMe(11,3)/DiMe(11,3)), in particular, consists of two chains of 12,15-epoxy-13,14-dimethyleicosa-12,14-dienoic at the C-1 and C-2 positions. The 12,15-epoxy-13,14-dimethyleicosa-12,14-dienoic moieties are derived from fish oil. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling. While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PEs are neutral zwitterions at physiological pH. They mostly have palmitic or stearic acid on carbon 1 and a long chain unsaturated fatty acid (e.g. 18:2, 20:4 and 22:6) on carbon 2. PE synthesis can occur via two pathways. The first requires that ethanolamine be activated by phosphorylation and then coupled to CDP. The ethanolamine is then transferred from CDP-ethanolamine to phosphatidic acid to yield PE. The second involves the decarboxylation of PS.
PC(16:0/18:3(6Z,9Z,12Z)) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(16:0/18:3(6Z,9Z,12Z)), in particular, consists of one chain of palmitic acid at the C-1 position and one chain of g-linolenic acid at the C-2 position. The palmitic acid moiety is derived from fish oils, milk fats, vegetable oils and animal fats, while the g-linolenic acid moiety is derived from animal fats. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
PIP(16:0/18:0) is a phosphatidylinositol phosphate. Phosphatidylinositol phosphates are acidic (anionic) phospholipids that consist of a phosphatidic acid backbone, linked via the phosphate group to a phosphorylated inositol (hexahydroxycyclohexane). Phosphatidylinositol phosphates are generated from phosphatidylinositols, which are phosphorylated by a number of different kinases that place the phosphate moiety on positions 4 and 5 of the inositol ring, although position 3 can also be phosphorylated. Phosphatidylinositols phosphates can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 18 and 20 carbons are the most common. PIP(16:0/18:0), in particular, consists of one chain of palmitic acid at the C-1 position and one chain of stearic acid at the C-2 position. The palmitic acid moiety is derived from fish oils, milk fats, vegetable oils and animal fats, while the stearic acid moiety is derived from animal fats, coco butter and sesame oil. The most important phosphatidylinositol phosphate in both quantitative and biological terms is phosphatidylinositol 4-phosphate. Phosphatidylinositol and the phosphatidylinositol phosphates are the main source of diacylglycerols that serve as signaling molecules, via the action of phospholipase C enzymes. Phosphatidylinositols phosphates are usually present at low levels only in tissues, typically at about 1 to 3% of the concentration of phosphatidylinositol.
PA(18:0/20:4(5Z,8Z,11Z,14Z)) is a phosphatidic acid. It is a glycerophospholipid in which a phosphate moiety occupies a glycerol substitution site. As is the case with diacylglycerols, phosphatidic acids can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PA(18:0/20:4(5Z,8Z,11Z,14Z)), in particular, consists of one chain of stearic acid at the C-1 position and one chain of arachidonic acid at the C-2 position. Phosphatidic acids are quite rare but are extremely important as intermediates in the biosynthesis of triacylglycerols and phospholipids.
PIP(16:0/20:3(5Z,8Z,11Z)) is a phosphatidylinositol phosphate. Phosphatidylinositol phosphates are acidic (anionic) phospholipids that consist of a phosphatidic acid backbone, linked via the phosphate group to a phosphorylated inositol (hexahydroxycyclohexane). Phosphatidylinositol phosphates are generated from phosphatidylinositols, which are phosphorylated by a number of different kinases that place the phosphate moiety on positions 4 and 5 of the inositol ring, although position 3 can also be phosphorylated. Phosphatidylinositols phosphates can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 18 and 20 carbons are the most common. PIP(16:0/20:3(5Z,8Z,11Z)), in particular, consists of one chain of palmitic acid at the C-1 position and one chain of mead acid at the C-2 position. The palmitic acid moiety is derived from fish oils, milk fats, vegetable oils and animal fats, while the mead acid moiety is derived from fish oils, liver and kidney. The most important phosphatidylinositol phosphate in both quantitative and biological terms is phosphatidylinositol 4-phosphate. Phosphatidylinositol and the phosphatidylinositol phosphates are the main source of diacylglycerols that serve as signaling molecules, via the action of phospholipase C enzymes. Phosphatidylinositols phosphates are usually present at low levels only in tissues, typically at about 1 to 3% of the concentration of phosphatidylinositol.
Sphingomyelin (d18:2(4E,14Z)/24:0) or SM(d18:2(4E,14Z)/24:0) is a type of sphingolipid found in animal cell membranes, especially in the membranous myelin sheath which surrounds some nerve cell axons. It usually consists of phosphorylcholine and ceramide. SM(d18:2(4E,14Z)/24:0) consists of a sphinga-4E,14Z-dienine backbone and a lignoceric acid chain. In humans, sphingomyelin is the only membrane phospholipid not derived from glycerol. Like all sphingolipids, SM has a ceramide core (sphingosine bonded to a fatty acid via an amide linkage). In addition, it contains one polar head group, which is either phosphocholine or phosphoethanolamine. The plasma membrane of cells is highly enriched in sphingomyelin and is considered largely to be found in the exoplasmic leaflet of the cell membrane. However, there is some evidence that there may also be a sphingomyelin pool in the inner leaflet of the membrane. Moreover, neutral sphingomyelinase-2, an enzyme that breaks down sphingomyelin into ceramide, has been found to localize exclusively to the inner leaflet further suggesting that there may be sphingomyelin present there. Sphingomyelin can accumulate in a rare hereditary disease called Niemann-Pick Disease, types A and B. Niemann-Pick disease is a genetically-inherited disease caused by a deficiency in the enzyme sphingomyelinase, which causes the accumulation of sphingomyelin in spleen, liver, lungs, bone marrow, and the brain, causing irreversible neurological damage. SMs play a role in signal transduction. Sphingomyelins are synthesized by the transfer of phosphorylcholine from phosphatidylcholine to a ceramide in a reaction catalyzed by sphingomyelin synthase.
GlcCer(d18:1/24:0) is a glycosphingolipid (ceramide and oligosaccharide)or oligoglycosylceramide with one or more sialic acids (i.e. n-acetylneuraminic acid) linked on the sugar chain. It is a component the cell plasma membrane which modulates cell signal transduction events. Gangliosides have been found to be highly important in immunology. Ganglioside GL1a carries a net-negative charge at pH 7.0 and is acidic. Gangliosides can amount to 6% of the weight of lipids from brain, but they are found at low levels in all animal tissues.Cerebrosides are glycosphingolipids. There are four types of glycosphingolipids, the cerebrosides, sulfatides, globosides and gangliosides. Cerebrosides have a single sugar group linked to ceramide. The most common are galactocerebrosides (containing galactose), the least common are glucocerebrosides (containing glucose). Galactocerebrosides are found predominantly in neuronal cell membranes. In contrast glucocerebrosides are not normally found in membranes. Instead, they are typically intermediates in the synthesis or degradation of more complex glycosphingolipids. Galactocerebrosides are synthesized from ceramide and UDP-galactose. Excess lysosomal accumulation of glucocerebrosides is found in Gaucher disease.
PIP(16:1(9Z)/18:0) is a phosphatidylinositol phosphate. Phosphatidylinositol phosphates are acidic (anionic) phospholipids that consist of a phosphatidic acid backbone, linked via the phosphate group to a phosphorylated inositol (hexahydroxycyclohexane). Phosphatidylinositol phosphates are generated from phosphatidylinositols, which are phosphorylated by a number of different kinases that place the phosphate moiety on positions 4 and 5 of the inositol ring, although position 3 can also be phosphorylated. Phosphatidylinositols phosphates can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 18 and 20 carbons are the most common. PIP(16:1(9Z)/18:0), in particular, consists of one chain of palmitoleic acid at the C-1 position and one chain of stearic acid at the C-2 position. The palmitoleic acid moiety is derived from animal fats and vegetable oils, while the stearic acid moiety is derived from animal fats, coco butter and sesame oil. The most important phosphatidylinositol phosphate in both quantitative and biological terms is phosphatidylinositol 4-phosphate. Phosphatidylinositol and the phosphatidylinositol phosphates are the main source of diacylglycerols that serve as signaling molecules, via the action of phospholipase C enzymes. Phosphatidylinositols phosphates are usually present at low levels only in tissues, typically at about 1 to 3% of the concentration of phosphatidylinositol.
Sphingomyelin (d18:2(4E,14Z)/24:1(15Z)) or SM(d18:2(4E,14Z)/24:1(15Z)) is a type of sphingolipid found in animal cell membranes, especially in the membranous myelin sheath which surrounds some nerve cell axons. It usually consists of phosphorylcholine and ceramide. SM(d18:2(4E,14Z)/24:1(15Z)) consists of a sphinga-4E,14Z-dienine backbone and a nervonic acid chain. In humans, sphingomyelin is the only membrane phospholipid not derived from glycerol. Like all sphingolipids, SM has a ceramide core (sphingosine bonded to a fatty acid via an amide linkage). In addition, it contains one polar head group, which is either phosphocholine or phosphoethanolamine. The plasma membrane of cells is highly enriched in sphingomyelin and is considered largely to be found in the exoplasmic leaflet of the cell membrane. However, there is some evidence that there may also be a sphingomyelin pool in the inner leaflet of the membrane. Moreover, neutral sphingomyelinase-2, an enzyme that breaks down sphingomyelin into ceramide, has been found to localize exclusively to the inner leaflet further suggesting that there may be sphingomyelin present there. Sphingomyelin can accumulate in a rare hereditary disease called Niemann-Pick Disease, types A and B. Niemann-Pick disease is a genetically-inherited disease caused by a deficiency in the enzyme sphingomyelinase, which causes the accumulation of sphingomyelin in spleen, liver, lungs, bone marrow, and the brain, causing irreversible neurological damage. SMs play a role in signal transduction. Sphingomyelins are synthesized by the transfer of phosphorylcholine from phosphatidylcholine to a ceramide in a reaction catalyzed by sphingomyelin synthase.
(3beta,5alpha,6beta,24R)-Stigmastane-3,5,6-triol is a constituent of cane sugar (Saccharum officinarum)
[12]-shogaol is a member of the class of compounds known as shogaols. Shogaols are ginger derivatives containing a shogaol moiety, which consists of a benzene ring bearing a dec-4-en-3-one moiety, a methoxyphenyl group, a hydroxyl group and at positions 1, 3, and 4, respectively. [12]-shogaol is practically insoluble (in water) and a very weakly acidic compound (based on its pKa). [12]-shogaol can be found in ginger, which makes [12]-shogaol a potential biomarker for the consumption of this food product.
Ubiquinone-4 is a member of the chemical class known as Polyprenylbenzoquinones. These are compounds containing a polyisoprene chain attached to a quinone at the second ring position. Ubiquione-4 has just 4 isoprene units. Normally in humans it has 10 (CoQ10). Ubiquinone-4 is an intermediate in the synthesis of Ubiquionone 10. Ubiquinone-4 is a Coenzyme Q analogue that have been identified in brain. Based on the isoprenoid moiety, the presence of various coenzyme Q homologues in prokaryotes and eurkaryotes has been confirmed, and these homologues are classified as Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11, and Q12. The numbers, Qn, refer to the number of isoprenoid units attached at the 6- position on the benzoquinone ring of the coenzyme Q moiety. (PMID: 12064350) Coenzyme Q is the only type of Quinone naturally found in animals (other quinones such as vitamin K is provided by foods). Coenzyme Q is a fat-soluble and amphipathic compound that is the integral component of the electron transport chain in mitochondria. It is ubiquitous in nature and is found in subcellular organelles, serum lipoproteins, blood plasma, urine, and feces. Ubiquinones are amphipathic because of the benzoquinone ring (hydrophilic) and the polyisoprenoid side chain moiety (lipophilic). The primary role of coenzyme Q is to transfer electrons between redox components of the electron transport chain, to create a proton gradient across the inner mitochondrial membrane and drive ATP formation. Additional functions of coenzyme Q are to influence membrane fluidity; to recycle the radical forms of vitamin C and E; and, most important, to act as a lipid antioxidant protecting membrane phospholipids against peroxidation. Coenzyme Q is the only endogenously occurring lipid-soluble antioxidant that occurs ubiquitously and can be synthesized in all organisms.
3-trans,5-cis-Octadienoyl-CoA is a metabolite formed during the beta-oxidation of unsaturated fatty acids with double bonds extending from odd-numbered carbon atoms by mitochondrial delta 3,delta 2-enoyl-CoA isomerase (EC 5.3.3.8) from 2-trans-5-cis-octadienoyl-CoA. 2-trans-5-cis-octadienoyl-CoA is formed by medium-chain acyl-CoA dehydrogenase (EC 1.3.99.3) from 5-cis-Octenoyl-CoA, a putative metabolite of linolenic acid.(PMID 1495956).
Acesulfame is a non-nutritive sweetener Acesulfame potassium is a calorie-free artificial sweetener, also known as Acesulfame K or Ace K (K being the symbol for potassium), and marketed under the trade names Sunett and Sweet One. In the European Union, it is known under the E number (additive code) E950. It was discovered accidentally in 1967 by German chemist Karl Clauss at Hoechst AG (now Nutrinova). In chemical structure, acesulfame potassium is the potassium salt of 6-methyl-1,2,3- oxathiazine-4(3H)-one 2,2-dioxide. It is a white crystalline powder with molecular formula C4H4KNO4S and a molecular weight of 201.24.
alpha-CEHC glucuronide is the glucuronide conjugate of alpha-CEHC, a vitamin E metabolite with a truncated phytyl tail (PMID: 9804189). About one-third of the alpha-CEHC circulating in the blood is present as alpha-CEHC glucuronide. alpha-CEHC glucuronide is excreted in the urine (PMID: 10552913).
PC(18:1(9Z)/18:0) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(18:1(9Z)/18:0), in particular, consists of one chain of oleic acid at the C-1 position and one chain of stearic acid at the C-2 position. The oleic acid moiety is derived from vegetable oils, especially olive and canola oil, while the stearic acid moiety is derived from animal fats, coco butter and sesame oil. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
TG(18:0/16:0/18:0), also known as triacylglycerols or triacylglycerides or glycerol 1,3-dioctadecanoate 2-hexadecanoate, is found in cocoa and cocoa products. It is isolated from cocoa butter
Pyrraline is Maillard produced, obtained by reaction between <ht>BCS47-B</ht> and <ht>HHS42-T</ht>.
Plasma 21-deoxycortisol (21DF) is an excellent marker of 21-hydroxylase deficiency. Currently, it is the only marker able to detect heterozygous carriers with 21-hydroxylase deficiency after Adrenocorticotropic Hormone (ACTH) stimulation. The syndrome of congenital adrenal hyperplasia (CAH) comprises the spectrum of autosomal recessive enzymatic disorders that impair cortisol biosynthesis. The hormonal pattern and clinical manifestations result from hyperstimulation of the adrenal cortex by excessive production of ACTH, untied from the negative feedback exerted by reduced cortisol levels, and the ultimate accumulation of F precursors and androgens. These abnormalities predispose the female newborn to ambiguous genitalia (female pseudohermaphroditism) and precocious puberty that may occur in both sexes. CAH due to 21-hydroxylase deficiency (21OHD) comprises nearly 90% of all cases, with an estimated worldwide incidence of 1 in 14,000 live births. Because 21-deoxycortisol (21DF) is an 11b-hydroxylase (11bOH) derivative of 17-hydroxyprogesterone (17OHP), its serum levels are parallel and proportionally elevated in patients with 21OHD but decreased or undetectable in those with 11b-hydroxylase deficiency (11bOHD), another genetic disorder. Due to the marked buildup of 17OHP in 21OHD, this precursor steroid can proceed directly to 11-hydroxylation, producing distinct elevations of 21DF (PMID: 16551734, 10731638).
3-Hydroxyanthranilic acid, also known as 2-amino-3-hydroxy-benzoate or 3-ohaa, belongs to the class of organic compounds known as hydroxybenzoic acid derivatives. Hydroxybenzoic acid derivatives are compounds containing a hydroxybenzoic acid (or a derivative), which is a benzene ring bearing a carboxyl and a hydroxyl groups. 3-Hydroxyanthranilic acid is a drug. 3-Hydroxyanthranilic acid exists in all living species, ranging from bacteria to humans. Within humans, 3-hydroxyanthranilic acid participates in a number of enzymatic reactions. In particular, 3-hydroxyanthranilic acid and L-alanine can be biosynthesized from L-3-hydroxykynurenine through the action of the enzyme kynureninase. In addition, 3-hydroxyanthranilic acid can be converted into cinnavalininate through the action of the enzyme catalase. 3-Hydroxyanthranilic acid is an intermediate in the metabolism of tryptophan. In humans, 3-hydroxyanthranilic acid is involved in tryptophan metabolism. Outside of the human body, 3-hydroxyanthranilic acid has been detected, but not quantified in brassicas. This could make 3-hydroxyanthranilic acid a potential biomarker for the consumption of these foods. It is new antioxidant isolated from methanol extract of tempeh. It is effective in preventing autoxidation of soybean oil and powder, while antioxidant 6,7,4'-trihydroxyisoflavone is not.
Methylglutaric acid is a leucine metabolite. A large amount of methylglutaric acid is identified in urine of patients with deficiency of 3-methylglutaconyl coenzyme A hydratase (PMID 6181239). Methylglutaric acid is also found to be associated with 3-hydroxy-3-methylglutaryl-CoA lyase deficiency, another inborn error of metabolism.
4-Hydroxy-L-glutamic acid is an intermediate in the metabolism of gamma-hydroxyglutamic acid. Specifically, 4-hydroxy-L-glutamic acid combines with 2-oxoglutarate to produce 4-hydroxy-2-oxoglutarate and glutamate. The reaction can be described as: 4-hydroxy-L-glutamate + 2-oxoglutarate <=> 4-hydroxy-2-oxoglutarate + L-glutamate. This reaction is catalyzed by 4-hydroxyglutamate aminotransferase (PMID: 13948827).
Dihydrouridine is a pyrimidine which is the result of adding two hydrogen atoms to a uridine. Dihydrouridine is found only in tRNA molecules. An inhibitor of nucleotide metabolism.
5-Aminolevulinic acid, also known as 5-aminolevulinate or 5-amino-4-oxopentanoate, belongs to the class of organic compounds known as delta amino acids and derivatives. Delta amino acids and derivatives are compounds containing a carboxylic acid group and an amino group at the C5 carbon atom. 5-Aminolevulinic acid is a very hydrophobic molecule, practically insoluble in water, and relatively neutral. 5-Aminolevulinic acid exists in all living species, ranging from bacteria to humans. 5-aminolevulinic acid can be biosynthesized from glycine and succinyl-CoA by the enzyme 5-aminolevulinate synthase. The simplest delta-amino acid in which the hydrogens at the gamma position are replaced by an oxo group. In humans, 5-aminolevulinic acid is involved in the metabolic disorder called the dimethylglycine dehydrogenase deficiency pathway. Outside of the human body, 5-Aminolevulinic acid has been detected, but not quantified in several different foods, such as american butterfish, vaccinium (blueberry, cranberry, huckleberry), amaranths, purple mangosteens, and garden cress. Used (in the form of the hydrochloride salt) in combination with blue light illumination for the treatment of minimally to moderately thick actinic keratosis of the face or scalp. It is metabolised to protoporphyrin IX, a photoactive compound which accumulates in the skin.
6-Phosphogluconic acid, also known as 6-phospho-D-gluconate or gluconic acid-6-phosphate, belongs to the class of organic compounds known as monosaccharide phosphates. These are monosaccharides comprising a phosphated group linked to the carbohydrate unit. 6-Phosphogluconic acid exists in all living species, ranging from bacteria to humans. Within humans, 6-phosphogluconic acid participates in a number of enzymatic reactions. In particular, 6-phosphogluconic acid can be biosynthesized from gluconolactone; which is mediated by the enzyme 6-phosphogluconolactonase. In addition, 6-phosphogluconic acid can be converted into D-ribulose 5-phosphate through the action of the enzyme 6-phosphogluconate dehydrogenase, decarboxylating. In humans, 6-phosphogluconic acid is involved in the metabolic disorder called the transaldolase deficiency pathway. Outside of the human body, 6-Phosphogluconic acid has been detected, but not quantified in several different foods, such as cascade huckleberries, common chokecherries, half-highbush blueberries, american cranberries, and okra.
Adenosine triphosphate (ATP) is a nucleotide consisting of a purine base (adenine) attached to the first carbon atom of ribose (a pentose sugar). Three phosphate groups are esterified at the fifth carbon atom of the ribose. ATP is incorporated into nucleic acids by polymerases in the processes of DNA replication and transcription. ATP contributes to cellular energy charge and participates in overall energy balance, maintaining cellular homeostasis. ATP can act as an extracellular signaling molecule via interactions with specific purinergic receptors to mediate a wide variety of processes as diverse as neurotransmission, inflammation, apoptosis, and bone remodelling. Extracellular ATP and its metabolite adenosine have also been shown to exert a variety of effects on nearly every cell type in human skin, and ATP seems to play a direct role in triggering skin inflammatory, regenerative, and fibrotic responses to mechanical injury, an indirect role in melanocyte proliferation and apoptosis, and a complex role in Langerhans cell-directed adaptive immunity. During exercise, intracellular homeostasis depends on the matching of adenosine triphosphate (ATP) supply and ATP demand. Metabolites play a useful role in communicating the extent of ATP demand to the metabolic supply pathways. Effects as different as proliferation or differentiation, chemotaxis, release of cytokines or lysosomal constituents, and generation of reactive oxygen or nitrogen species are elicited upon stimulation of blood cells with extracellular ATP. The increased concentration of adenosine triphosphate (ATP) in erythrocytes from patients with chronic renal failure (CRF) has been observed in many studies but the mechanism leading to these abnormalities still is controversial. (PMID: 15490415, 15129319, 14707763, 14696970, 11157473).
Aldosterone is a steroid hormone produced by the adrenal cortex in the adrenal gland to regulate sodium and potassium balance in the blood. Specifically, it regulates electrolyte and water balance by increasing the renal retention of sodium and the excretion of potassium. It is synthesized from cholesterol by aldosterone synthase, which is absent in other sections of the adrenal gland. It is the sole endogenous member of the class of mineralocorticoids. Aldosterone increases the permeability of the apical (luminal) membrane of the kidney's collecting ducts to potassium and sodium and activates their basolateral Na+/K+ pumps, stimulating ATP hydrolysis, reabsorbing sodium (Na+) ions and water into the blood, and excreting potassium (K+) ions into the urine.
Arginosuccinic acid is a basic amino acid. Some cells synthesize it from citrulline, aspartic acid and use it as a precursor for arginine in the urea cycle or Citrulline-NO cycle. The enzyme that catalyzes the reaction is argininosuccinate synthetase. Argininosuccinic acid is a precursor to fumarate in the citric acid cycle via argininosuccinate lyase. Defects in the argininosuccinate lyase enzyme can lead to argininosuccinate lyase deficiency, which is an inborn error of metabolism. Argininosuccinate (ASA) lyase deficiency results in defective cleavage of ASA. This leads to an accumulation of ASA in cells and an excessive excretion of ASA in urine (argininosuccinic aciduria). In virtually all respects, this disorder shares the characteristics of other urea cycle defects. The most important characteristic of ASA lyase deficiency is its propensity to cause hyperammonemia in affected individuals. ASA in affected individuals is excreted by the kidney at a rate practically equivalent to the glomerular filtration rate (GFR). Whether ASA itself causes a degree of toxicity due to hepatocellular accumulation is unknown; such an effect could help explain hyperammonemia development in affected individuals. Regardless, the name of the disease is derived from the rapid clearance of ASA in urine, although elevated levels of ASA can be found in plasma. ASA lyase deficiency is associated with high mortality and morbidity rates. Symptoms of ASA lyase deficiency include anorexia, irritability rapid breathing, lethargy and vomiting. Extreme symptoms include coma and cerebral edema.
Biopterin, also known as tetrahydrobiopterin or BH4, belongs to the class of organic compounds known as biopterins and derivatives. These are coenzymes containing a 2-amino-pteridine-4-one derivative. Biopterin or tetrahydrobiopterin is also classified as a pterin derivative that consists of pterin group bearing an amino, an oxo and a 1,2-dihydroxypropyl substituent at positions 2, 4 and 6, respectively. Biopterin compounds found within the animals include BH4 (tetrahydrobiopterin), the free radical BH3, and BH2 (also a free radical, called Dihydrobiopterin). BH2 is produced in the synthesis of L-DOPA, dopamine, norepinephrine and epinephrine. It is restored to the required cofactor tetrahydrobiopterin by the enzyme dihydrobiopterin reductase. Tetrahydrobiopterin (BH4) is a cofactor of the three aromatic amino acid hydroxylase enzymes, used in the degradation of amino acid phenylalanine and in the biosynthesis of the neurotransmitters serotonin (5-hydroxytryptamine, 5-HT), melatonin, dopamine, norepinephrine (noradrenaline), epinephrine (adrenaline). It is also a cofactor for the production of nitric oxide (NO) by the nitric oxide syntheses.    Tetrahydrobiopterin is biosynthesized from guanosine triphosphate (GTP) by three chemical reactions mediated by the enzymes GTP cyclohydrolase I (GTPCH), 6-pyruvoyltetrahydropterin synthase (PTPS), and sepiapterin reductase (SR). Biopterin synthesis disorders are a cause of hyperphenylalaninemia. There are 3 distinct forms of phenylketonuria or hyperphenylalaninemia, each caused by lack of aromatic amino acid hydroxylase enzymes. The variant forms of hyperphenylalaninemia that are caused by the lack of dihydropteridine reductase or tetrahydrobiopterin are characterized by severe neurological deterioration, impaired functioning of tyrosine and tryptophan hydroxylases, and the resultant deficiency of tyrosine- and tryptophan-derived monoamine neurotransmitters in brain. (PMID 3930837).
Cyclandelate is only found in individuals that have used or taken this drug. It is a direct-acting smooth muscle relaxant used to dilate blood vessels. It may cause gastrointestinal distress and tachycardia. Cyclandelate is not approved for use in the U.S. or Canada, but is approved in various European countries.Cyclandelate produces peripheral vasodilation by a direct effect on vascular smooth muscle. Pharmacological action may be due to calcium-channel antagonism.
Dihydroisophorol is a flavouring ingredien
Hesperidin is an abundant and inexpensive by-product of Citrus cultivation and is the major flavonoid in sweet orange and lemon. In young immature oranges it can account for up to 14% of the fresh weight of the fruit. Hesperidin is an abundant and inexpensive by-product of Citrus cultivation and is the major flavonoid in sweet orange and lemon. In young immature oranges it can account for up to 14% of the fresh weight of the fruit due to vitamin C deficiency such as bruising due to capillary fragility were found in early studies to be relieved by crude vitamin C extract but not by purified vitamin C. The bioflavonoids, formerly called "vitamin P", were found to be the essential components in correcting this bruising tendency and improving the permeability and integrity of the capillary lining. These bioflavonoids include hesperidin, citrin, rutin, flavones, flavonols, catechin and quercetin. Of historical importance is the observation that "citrin", a mixture of two flavonoids, eriodictyol and hesperidin, was considered to possess a vitamin-like activity, as early as in 1949. Hesperidin deficiency has since been linked with abnormal capillary leakiness as well as pain in the extremities causing aches, weakness and night leg cramps. Supplemental hesperidin also helps in reducing oedema or excess swelling in the legs due to fluid accumulation. As with other bioflavonoids, hesperidin works best when administered concomitantly with vitamin C. No signs of toxicity have been observed with normal intake of hesperidin. Hesperidin was first discovered in 1827, by Lebreton, but not in a pure state and has been under continuous investigation since then (PMID:11746857).
Neohesperidin dihydrochalcone is found in sweet orange. Intensely sweet, 612 times more sweet than sucrose. Acceptable daily intake: 5 mg/kg (1987). Neohesperidin dihydrochalcone is a permitted in EU at low concs. (=10 ppm) for certain applications, e.g. low-alcohol beer. Generally recognised as safe (GRAS) in the USA. Practical use limited by slow development of taste sensation and peculiar aftertaste Neohesperidin dihydrochalcone, sometimes abbreviated to neohesperidin DC or simply NHDC, is an artificial sweetener derived from citrus. The European Union approved NHDC's use as a sweetener in 1994. It has not been approved as a sweetener in the United States. It is sometimes said that NHDC is considered a Generally Recognized as Safe flavour enhancer by the Flavour and Extract Manufacturers' Association, which is a trade group with no legal standing. NHDC has never appeared on the FDA's GRAS listing
Delphinidin 3,5-diglucoside is found in alfalfa. Delphinidin 3,5-diglucoside is isolated from pomegranat
Acetaldehyde oxime is an oxime is one in a class of chemical compounds with the general formula R1R2CNOH, where R1 is an organic side chain and R2 is either hydrogen, forming an aldoxime, or another organic group, forming a ketoxime.
Arginylhydroxyproline is a dipeptide composed of arginine and hydroxyproline. It is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis.
Persicaxanthin is found in european plum. Persicaxanthin is isolated from plums Prunus domestic
5,6-Epoxy-8,11,14-eicosatrienoic acid is an Epoxyeicosatrienoic acid (EET), a metabolite of arachidonic acid. The epoxyeicosatrienoic acids (EETs) are endogenous lipid mediators produced by P450 epoxygenases and metabolized through multiple pathways including soluble epoxide hydrolase (sEH). The cytochrome P-450 (P450) monooxygenase pathway includes enzymes of the CYP1A, CYP2B, CYP2C, CYP2E, and CYP2J subfamilies that catalyze the formation of four regioisomeric products, 5,6-, 8,9-, 11,12-, and 14,15-epoxyeicosatrienoic acid. EETs are produced in brain and perform important biological functions, including protection from ischemic injury. Both light flashes and direct glial stimulation produce vasodilatation mediated by EETs. EETs may be involved in the development of hypertension and endothelial dysfunction in DOCA-salt rats, but not in excessive collagen deposition or electrophysiological abnormalities. EETs have vasodilator and natriuretic effect. Blockade of EET formation is associated with salt-sensitive hypertension. (PMID: 17494091, 17468203, 17434916, 17406062, 17361113).
Avenanthramide 1f is a polyphenol compound found in foods of plant origin  (PMID: 20428313)
Adenosine is a nucleoside that is composed of adenine and D-ribose. Adenosine or adenosine derivatives play many important biological roles in addition to being components of DNA and RNA. For instance, adenosine plays an important role in energy transfer as adenosine triphosphate (ATP) and adenosine diphosphate (ADP). It also plays a role in signal transduction as cyclic adenosine monophosphate (cAMP). Adenosine itself is both a neurotransmitter and potent vasodilator. When administered intravenously adenosine causes transient heart block in the AV node. Due to the effects of adenosine on AV node-dependent supraventricular tachycardia, adenosine is considered a class V antiarrhythmic agent. Overdoses of adenosine intake (as a drug) can lead to several side effects including chest pain, feeling faint, shortness of breath, and tingling of the senses. Serious side effects include a worsening dysrhythmia and low blood pressure. When present in sufficiently high levels, adenosine can act as an immunotoxin and a metabotoxin. An immunotoxin disrupts, limits the function, or destroys immune cells. A metabotoxin is an endogenous metabolite that causes adverse health effects at chronically high levels. Chronically high levels of adenosine are associated with adenosine deaminase deficiency. Adenosine is a precursor to deoxyadenosine, which is a precursor to dATP. A buildup of dATP in cells inhibits ribonucleotide reductase and prevents DNA synthesis, so cells are unable to divide. Since developing T cells and B cells are some of the most mitotically active cells, they are unable to divide and propagate to respond to immune challenges. High levels of deoxyadenosine also lead to an increase in S-adenosylhomocysteine, which is toxic to immature lymphocytes.
Dioscoretine is found in root vegetables. Dioscoretine is an alkaloid from the tubers of the famine food Dioscorea dumetorum.
2-Isopropylphenyl methylcarbamate is an Agricultural insecticide used on rice, cocoa, sugar cane, vegetables and other crop
desethylamodiaquine is a metabolite of amodiaquine. Amodiaquine (trade names Camoquin, Flavoquine) is a 4-aminoquinoline compound related to chloroquine, used as an antimalarial and anti-inflammatory agent. Amodiaquine has been shown to be more effective than chloroquine in treating CRPF (chloroquine-resistant Plasmodium falciparum) malaria infections and may afford more protection than chloroquine when used as weekly prophylaxis. Amodiaquine, like chloroquine, is generally well tolerated. (Wikipedia)
Cholesta-4,6-dien-3-one is a product of the oxidation of cholesteral. It may be metabolized to 4-cholesten-3-one and cholestanol by liver, adrenals and brain. An accumulation of cholesta-4,6-dien-3-one is found in serum of patients with cerebrotendinous xanthomatosis, and it is possible that accumulation of cholesterol in these patients is secondary to accumulation of cholesta-4,6-dien-3-one (PMID: 3557306; 16757819; 3676336).
Treosulfan belongs to the family of Methanesulfonates. These are compounds containing a methanesulfonate moiety, which consists of a methane linked to the sulfur atom of a sulfonate group.
Verapamil  metabolite D-617 is only found in individuals that have used or taken Verapamil. D-617 is a metabolite of Verapamil. D-617 belongs to the family of Phenylbutylamines. These are compounds containing a phenylbutylamine moiety, which consists of a phenyl group substituted at the fourth carbon by an butan-1-amine.
m-chlorophenylpiperazine (m-CPP) is a metabolite of trazodone. Trazodone (also sold under the brand names Desyrel, Oleptro, Beneficat, Deprax, Desirel, Molipaxin, Thombran, Trazorel, Trialodine, Trittico, and Mesyrel) is an antidepressant of the serotonin antagonist and reuptake inhibitor (SARI) class. It is a phenylpiperazine compound. Trazodone also has anxiolytic and hypnotic effects. Trazodone has considerably fewer prominent anticholinergic and sexual side effects than most of the tricyclic antidepressants (TCAs). (Wikipedia)
3'-Azido-3'-deoxy-5'- O-beta-D-glucopyranuronosylthymidine is a metabolite of zidovudine. Zidovudine or azidothymidine (AZT) (also called ZDV) is a nucleoside analog reverse-transcriptase inhibitor (NRTI), a type of antiretroviral drug used for the successful treatment of HIV/AIDS infectiousness. It is a therapeutic analog of thymidine. AZT is the first U.S. government-approved treatment for HIV therapy, prescribed under the names Retrovir and Retrovis. (Wikipedia)
a-Methyldopamine is a metabolite of methyldopa. Methyldopa (-α-Methyl-3,4-dihydroxyphenylalanine; Aldomet, Aldoril, Dopamet, Dopegyt, etc. ) is an alpha-adrenergic agonist (selective for α2-adrenergic receptors) psychoactive drug used as a sympatholytic or antihypertensive. Its use is now mostly deprecated following the introduction of alternative safer classes of agents. However, it continues to have a role in otherwise difficult to treat hypertension and gestational hypertension (also known as pregnancy-induced hypertension). (Wikipedia)
2-hydroxymexiletine is a metabolite of mexiletine. Mexiletine (sold under the trade name Mexitil) belongs to the Class IB anti-arrhythmic group of medicines. It is used to treat arrhythmias within the heart, or seriously irregular heartbeats. It slows conduction in the heart and makes the heart tissue less sensitive. Dizziness, heartburn, nausea, nervousness, trembling, unsteadiness are common side effects. It is available in injection and capsule form. (Wikipedia)
(S)-Byakangelicin is found in herbs and spices. (S)-Byakangelicin is a constituent of common rue (Ruta graveolens).
It is used as a food additive .
Industrial biocide. 1,2-Benzisothiazol-3(2H)-one is present in can-end cement
Glycyl-Methionine is a dipeptide composed of glycine and methionine. It is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis. This dipeptide has not yet been identified in human tissues or biofluids and so it is classified as an 'Expected' metabolite.
24,25-Dihydroxyvitamin D (24R,25(OH)2D3) circulates in blood at concentrations about 1000 times higher than 1alpha,25(OH)2D3. 24-Hydroxylase is present in the proximal convoluted tubule cells of the kidney and in virtual all target cells of 1alpha,25(OH)2D3. Interestingly, 1alpha,25(OH)2D3 is a very strong inducer of 24-hydroxylase activity and 24R,25(OH)2D3 formation. Also parathyroid hormone (PTH) regulates 24-hydroxylase activity but in a tissue specific manner, i.e. inhibitory in the kidney while a synergistic effect together with 1alpha,25(OH)2D3 is observed in osteoblasts. Generally, 24-hydroxylation has been considered the first step in the degradation pathway of 1alpha,25(OH)2D3 and 25-(OH)D3. However, through the past decades data have accumulated that 24R,25(OH)2D3 is not merely a degradation product but has effects on its own. Classic studies have demonstrated the significance of 24R,25(OH)2D3 for normal chicken egg hatchability and calcium and phosphorus homeostasis. More recently it became apparent that 24R,25(OH)2D3 also has distinct effects on cartilage in particular the resting zone cells. 24R,25(OH)2D3 stimulates osteocalcin synthesis in human osteoblasts. 24R,25(OH)2D3 plays a role in bone metabolism but that it acts in concert with 1alpha,25(OH)2D3 to obtain an optimal effect. (PMID: 11179746).
Sulfamoxole is only found in individuals that have used or taken this drug. It is a sulfonamide antibacterial. Sulfamoxole is a competitive inhibitor of the bacterial enzyme dihydropteroate synthetase. This enzyme is needed for the proper processing of para-aminobenzoic acid (PABA) which is essential for folic acid synthesis. The inhibited reaction is necessary in these organisms for the synthesis of folic acid.
Homovanillic acid (HVA), also known as homovanillate, belongs to the class of organic compounds known as methoxyphenols. Methoxyphenols are compounds containing a methoxy group attached to the benzene ring of a phenol moiety. HVA is also classified as a catechol.  HVA is a major catecholamine metabolite that is produced by a consecutive action of monoamine oxidase and catechol-O-methyltransferase on dopamine. HVA is typically elevated in patients with catecholamine-secreting tumors (such as neuroblastoma, pheochromocytoma, and other neural crest tumors). HVA levels are also used in monitoring patients who have been treated for these kinds tumors. HVA levels may also be altered in disorders of catecholamine metabolism such as monoamine oxidase-A (MOA) deficiency. MOA deficiency can cause decreased urinary HVA values, while a deficiency of dopamine beta-hydrolase (the enzyme that converts dopamine to norepinephrine) can cause elevated urinary HVA values. Within humans, HVA participates in a number of enzymatic reactions. In particular, HVA and pyrocatechol can be biosynthesized from 3,4-dihydroxybenzeneacetic acid and guaiacol. This reaction is catalyzed by the enzyme known as catechol O-methyltransferase. In addition, HVA can be biosynthesized from homovanillin through the action of the enzyme known aldehyde dehydrogenase. HVA has recently been found in a number of beers and appears to arise from the fermentation process (https://doi.org/10.1006/fstl.1999.0593). HVA is also a metabolite of Bifidobacterium (PMID: 24958563) and the bacterial breakdown of dietary flavonoids. Dietary flavonols commonly found in tomatoes, onions, and tea, can lead to significantly elevated levels of urinary HVA (PMID: 20933512). Likewise, the microbial digestion of hydroxytyrosol (found in olive oil) can also lead to elevated levels of HVA in humans (PMID: 11929304).
Buprenorphine glucuronide is a metabolite of buprenorphine. Buprenorphine is a semi-synthetic opioid that is used to treat opioid addiction in higher dosages (>2 mg), to control moderate acute pain in non-opioid-tolerant individuals in lower dosages, and to control moderate chronic pain in dosages ranging from 20–70 µg/hour. (Wikipedia)
Pulegone belongs to the class of organic compounds known as menthane monoterpenoids. These are monoterpenoids with a structure based on the o-, m-, or p-menthane backbone. P-menthane consists of the cyclohexane ring with a methyl group and a (2-methyl)-propyl group at the 1 and 4 ring position, respectively. The o- and m- menthanes are much rarer, and presumably arise by alkyl migration of p-menthanes. It is formally classified as a cyclic ketone although it is biochemically a monoterpenoid as it is synthesized via isoprene units. Monoterpenoids are terpenes that contain 10 carbon atoms and are comprised of two isoprene units. The biosynthesis of monoterpenes is known to occur mainly through the methyl-erythritol-phosphate (MEP) pathway in plant cell plastids (PMID:7640522 ). Geranyl diphosphate (GPP) is a key intermediate in the biosynthesis of cyclic monoterpenes. GPP undergoes several cyclization reactions to yield a diverse number of cyclic arrangements. Pulegone is a hydrophobic, neutral compound that is insoluble in water. It exists as a clear, colorless oil. There are two isomers of Pulegone (the R and the S isomer), with the R isomer being more common. It is used industrially as a food additive and a perfuming agent. Pulegone has a fresh, minty or peppermint odor and a minty, fruity or green taste. It is found naturally in the essential oils of a variety of plants such as Nepeta cataria (catnip), Hedeoma pulegioides (pennyroyal), and Mentha species. It is also found in a number of plant foods and spices such as blackberryies, black currants, bell peppers, cornmint, rosemary, black tea, thyme, orange mint, peppermint, and spearmint, which makes it a potential biomarker for the consumption of these food products. Pulegone is also one of more than 140 terpenes that are found in cannabis plants (PMID:6991645 ).
24,25-Dihydroxyvitamin D (24R,25(OH)2D3) circulates in blood at concentrations about 1000 times higher than 1alpha,25(OH)2D3. 24-Hydroxylase is present in the proximal convoluted tubule cells of the kidney and in virtual all target cells of 1alpha,25(OH)2D3. Interestingly, 1alpha,25(OH)2D3 is a very strong inducer of 24-hydroxylase activity and 24R,25(OH)2D3 formation. Also parathyroid hormone (PTH) regulates 24-hydroxylase activity but in a tissue specific manner, i.e. inhibitory in the kidney while a synergistic effect together with 1alpha,25(OH)2D3 is observed in osteoblasts. Generally, 24-hydroxylation has been considered the first step in the degradation pathway of 1alpha,25(OH)2D3 and 25-(OH)D3. However, through the past decades data have accumulated that 24R,25(OH)2D3 is not merely a degradation product but has effects on its own. Classic studies have demonstrated the significance of 24R,25(OH)2D3 for normal chicken egg hatchability and calcium and phosphorus homeostasis. More recently it became apparent that 24R,25(OH)2D3 also has distinct effects on cartilage in particular the resting zone cells. 24R,25(OH)2D3 stimulates osteocalcin synthesis in human osteoblasts. 24R,25(OH)2D3 plays a role in bone metabolism but that it acts in concert with 1alpha,25(OH)2D3 to obtain an optimal effect. (PMID: 11179746).
6-Methylquinoline is found in tea. 6-Methylquinoline is a flavouring ingredient.
Adenosine 2'-phosphate is converted enzymatically from adenosine 2',3'-cyclic phosphate via the enzyme 2',3'-cyclic-nucleotide 3'-phosphodiesterase (EC 3.1.4.37). In the brain, this enzyme acts on 2',3'-cyclic AMP more rapidly than on the UMP or CMP derivatives. In the liver, this enzyme acts on 2',3'-cyclic CMP more rapidly than on the purine derivatives; it also hydrolyses the corresponding 3',5'-cyclic phosphates, more slowly. This latter enzyme has been called cyclic-CMP phosphodiesterase. (KEGG). This enzyme belongs to the family of hydrolases, specifically those acting on phosphoric diester bonds. The systematic name of this enzyme class is nucleoside-2',3'-cyclic-phosphate 2'-nucleotidohydrolase. (Wikipedia).
Biliverdin is a green pigment formed as a byproduct of hemoglobin breakdown. It consists of four linearly connected pyrrole rings (a tetrapyrrole). Biliverdin is formed when the heme group in hemoglobin is cleaved at its alpha-methene bridge. The resulting biliverdin is then reduced to bilirubin, a yellow pigment, by the enzyme biliverdin reductase. The changing color of a bruise from deep purple to yellow over time is a graphical indicator of this reaction. Biliverdin occurs in the bile of amphibia and of birds, but not in normal human bile or serum.
Avenalumin III is found in cereals and cereal products. Phytoalexin isolated from oat (Avena sativa) infected with rust fungus (Puccinia coronata).
Benzyl chloride belongs to the family of Substituted Benzenes. These are aromatic compounds containing a benzene substituted at one or more positions.
4-Methyl-3-penten-2-one, also known as isopropylidene acetone or (CH3)2C=chc(=o)CH3, belongs to the class of organic compounds known as enones. Enones are compounds containing the enone functional group, with the structure RC(=O)CR'. 4-Methyl-3-penten-2-one is a very hydrophobic molecule, practically insoluble in water, and relatively neutral. Thus, 4-methyl-3-penten-2-one is considered to be an oxygenated hydrocarbon lipid molecule. 4-Methyl-3-penten-2-one is a sweet, acrylic, and chemical tasting compound. 4-Methyl-3-penten-2-one has been detected, but not quantified, in several different foods, such as orange bell peppers, pepper (c. frutescens), herbs and spices, yellow bell peppers, and green bell peppers. This could make 4-methyl-3-penten-2-one a potential biomarker for the consumption of these foods. With regards to humans, 4-Methyl-3-penten-2-one has been linked to the inborn metabolic disorder celiac disease.
Phensuximide is an anticonvulsant in the succinimide class. It suppresses the paroxysmal three cycle per second spike and wave EEG pattern associated with lapses of consciousness in petit mal seizures. The frequency of attacks is reduced by depression of nerve transmission in the motor cortex.
1-(m-Methoxycinnamoyl)pyrrolidine is found in beverages. 1-(m-Methoxycinnamoyl)pyrrolidine is an alkaloid from the roots of kava (Piper methysticum). FDA advises against use of kava in food due to potential risk of severe liver damage (2002).
Pefloxacin N-oxide is a metabolite of pefloxacin. Pefloxacin is a synthetic chemotherapeutic agent used to treat severe and life threatening bacterial infections. Pefloxacin is commonly referred to as a fluoroquinolone drug and is a member of the fluoroquinolone class of antibacterials. It is an analog of norfloxacin. It is a synthetic fluoroquinolone, belonging to the 3rd generation of quinolones. Pefloxacin is extensively prescribed in France. Pefloxacin has not been approved for use in the United States. (Wikipedia)
Benzenethiol is a flavouring agent Thiophenol is a chemical compound with the formula C6H5SH, and sometimes abbreviated as PhSH. The foul-smelling liquid is the principal aromatic thiol. The chemical structures of thiophenols are analogous to phenols except the oxygen atom in the hydroxyl group (-OH) bonded to the aromatic ring is replaced by a sulfur atom. The prefix thio- implies a sulfur-containing compound and when used before a root word name for a compound which would normally contain an oxygen atom, thio- commonly means that the oxygen atom is replaced by a sulfur atom. Thiophenols also describes a class of compounds formally derived from thiophenol itself. All have a sulfhydryl group (-SH) covalently bonded to an aromatic ring. The organosulfur ligand in medicine merthiolate is a thiophenol.
D-glucaro-1,4-lactone belongs to the family of Pentoses. These are monosaccharides in which the carbohydrate moiety contains five carbon atoms.
Oryzarol is found in cereals and cereal products. Oryzarol is isolated from rice straw(Oryza sativa
2-aminonaphthalene belongs to the family of Naphthalenes. These are compounds containing a naphthalene moiety, which consists of two fused benzene rings.
Enalapril is a prodrug that belongs to the angiotensin-converting enzyme (ACE) inhibitor class of medications. It is rapidly metabolized in the liver to enalaprilat following oral administration. Enalaprilat is a potent, competitive inhibitor of ACE, the enzyme responsible for the conversion of angiotensin I (ATI) to angiotensin II (ATII). ATII regulates blood pressure and is a key component of the renin-angiotensin-aldosterone system (RAAS). Enalapril may be used to treat essential or renovascular hypertension and symptomatic congestive heart failure.
Isoleucyl-Asparagine is a dipeptide composed of isoleucine and asparagine. It is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis. This dipeptide has not yet been identified in human tissues or biofluids and so it is classified as an 'Expected' metabolite.
Etheno nucleosides are a new class of chemically modified components of nucleic acids. These base-modified nucleosides demonstrate significant biological properties, acting, among others, as antiviral or antitumor agents. One of the possible modifications of the nucleoside is their transformation into ethenonucleosides. Thus, nucleosides or their respective heterocyclic bases, possessing an exocyclic amino group, as well as a neighboring endocyclic nitrogen, can react with some bifunctional reagents (e.g., α-halocarbonyl compounds) to form products with an additional five-membered ring of the imidazole type. The ethenonucleosides basically do not occur in nature; some of the only exceptions are Y-nucleosides. Etheno modified DNA bases are generated from the carcinogens vinyl chloride and urethane, but also by reactions of DNA with products derived from lipid peroxidation (LPO) and oxidative stress via endogenous pathways. Highly variable background levels of epsilon-adducts were detected in DNA from different organs of unexposed humans and rodents. Several known cancer risk factors increased the level of these DNA lesions in target organs: elevated epsilon-adducts were found in hepatic DNA from patients with metal storage diseases, after overproduction of nitric oxide (NO) by inducible NO synthase (iNOS) in a mouse model, and in colonic polyps of familial adenomatous polyposis patients. A high omega-6-polyunsaturated fatty acid diet increased epsilon-DNA adducts in white blood cells of female subjects. (PMID:10882861).
beta-Sitosterol 3-O-beta-D-galactopyranoside is found in herbs and spices. beta-Sitosterol 3-O-beta-D-galactopyranoside is a constituent of Hibiscus sabdariffa (roselle) leaves.
Deslanoside is only found in individuals that have used or taken this drug. It is a cardiotonic glycoside from the leaves of Digitalis lanata. [PubChem]Deslanoside inhibits the Na-K-ATPase membrane pump, resulting in an increase in intracellular sodium and calcium concentrations. Increased intracellular concentrations of calcium may promote activation of contractile proteins (e.g., actin, myosin). Deslanoside also acts on the electrical activity of the heart, increasing the slope of phase 4 depolarization, shortening the action potential duration, and decreasing the maximal diastolic potential.
6-Lactoyltetrahydropterin is a putative intermediate in the de novo synthesis of tetrahydrobiopterin (BH4) pathway, in a reaction involving the enzyme sepiapterin reductase (E.C. 1.1.1.153) in human liver. In brain, an enzyme distinct from sepiapterin reductase catalyzes the TPNH-dependent reduction of 6-pyruvoyl-tetrahydropterin to 6-lactoyl-tetrahydropterin. (PMID: 4004850). In brain, the expression of other enzymes involved in BH4 biosynthesis includes aldose reductase, carbonyl reductase, GTP-cyclohydrolase I, and 6-pyruvoyltetrahydrobiopterin. Sepiapterin reductase expression is increased in Parkinson's disease brain tissue. (PMID: 17270157).
Lysylserine is a dipeptide composed of lysine and serine. It is an incomplete breakdown product of protein digestion or protein catabolism. Dipeptides are organic compounds containing a sequence of exactly two alpha-amino acids joined by a peptide bond. Some dipeptides are known to have physiological or cell-signalling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis.
2,6-Dimethyl-2,4-heptadiene is found in herbs and spices. 2,6-Dimethyl-2,4-heptadiene is a constituent of Osmanthus fragrans (sweet osmanthus)
2,3-Dihydro-4-methylfuran is found in animal foods. 2,3-Dihydro-4-methylfuran is a constituent of volatiles from cooked ham and beef and of oil from licorice roots (Glycyrrhiza glabra).
2-pentylfuran is a colourless to light yellow liquid that is not known to be produced by mammalian metabolism. It is present in many foods including alcoholic beverages, coffee, potatoes, tomatoes, roasted filberts, and soybean oil, and it is also a component of the aroma of these foods. 2-pentylfuran is a flavouring ingredient. 2-pentylfuran belongs to the furan family which is characterized by a furan ring (a five-member aromatic ring with one oxygen atom and four carbon atoms). A study showed that 2-pentylfuran is found in the breath of patients with Aspergillus fumigatus infections (PMID:19301177).
Acebutolol is only found in individuals that have used or taken this drug. It is a cardioselective beta-adrenergic antagonist with little effect on the bronchial receptors. The drug has stabilizing and quinidine-like effects on cardiac rhythm as well as weak inherent sympathomimetic action. [PubChem]Acebutolol is a selective &beta;1-receptor antagonist. Activation of &beta;1-receptors by epinephrine increases the heart rate and the blood pressure, and the heart consumes more oxygen. Acebutolol blocks these receptors, lowering the heart rate and blood pressure. This drug then has the reverse effect of epinephrine. In addition, beta blockers prevent the release of renin, which is a hormone produced by the kidneys which leads to constriction of blood vessels.
Crustecdysone is found in crustaceans. Crustecdysone is isolated from the marine crayfish Jasus lalandei in low yield (2 mg/ton
Scopolamine, also known as hyoscine, is a tropane alkaloid drug obtained from plants of the family Solanaceae (nightshades), such as henbane or jimson weed (Datura species). It is part of the secondary metabolites of plants. Scopolamine is used criminally as a date rape drug and as an aid to robbery, the most common act being the clandestine drugging of a victim's drink. It is preferred because it induces retrograde amnesia, or an inability to recall events prior to its administration. Victims of this crime are often admitted to a hospital in police custody, under the assumption that the patient is experiencing a psychotic episode. A telltale sign is a fever accompanied by a lack of sweat. An alkaloid from Solanaceae, especially Datura metel L. and Scopola carniolica. Scopolamine and its quaternary derivatives act as antimuscarinics like atropine, but may have more central nervous system effects. Among the many uses are as an anesthetic premedication, in urinary incontinence, in motion sickness, as an antispasmodic, and as a mydriatic and cycloplegic.
Veterinary growth promoter used for poultry and swine.
Methylmalonyl-CoA is an intermediate in the metabolism of Propanoate. It is a substrate for Malonyl-CoA decarboxylase (mitochondrial), Methylmalonyl-CoA mutase (mitochondrial) and Methylmalonyl-CoA epimerase (mitochondrial).
Hydroxyurea is only found in individuals that have used or taken this drug. It is an antineoplastic agent that inhibits DNA synthesis through the inhibition of ribonucleoside diphosphate reductase. [PubChem]Hydroxyurea is converted to a free radical nitroxide (NO) in vivo, and transported by diffusion into cells where it quenches the tyrosyl free radical at the active site of the M2 protein subunit of ribonucleotide reductase, inactivating the enzyme. The entire replicase complex, including ribonucleotide reductase, is inactivated and DNA synthesis is selectively inhibited, producing cell death in S phase and synchronization of the fraction of cells that survive. Repair of DNA damaged by chemicals or irradiation is also inhibited by hydroxyurea, offering potential synergy between hydroxyurea and radiation or alkylating agents. Hydroxyurea also increases the level of fetal hemoglobin, leading to a reduction in the incidence of vasoocclusive crises in sickle cell anemia. Levels of fetal hemoglobin increase in response to activation of soluble guanylyl cyclase (sGC) by hydroxyurea-derived NO.
Tartronate semialdehyde is an intermediate in ascorbate and aldarate as well as glyoxylate and dicarboxylate metabolism. It is generated from 2-dehydro-3-deoxy-D-glucarate and 5-dehydro-4-deoxy-D-glucarate via the enzyme 2-dehydro-3-deoxyglucarate aldolase [EC:4.1.2.20].
Pentoxifylline is only found in individuals that have used or taken this drug. It is a methylxanthine derivative that inhibits phosphodiesterase and affects blood rheology. It improves blood flow by increasing erythrocyte and leukocyte flexibility. It also inhibits platelet aggregation. Pentoxifylline modulates immunologic activity by stimulating cytokine production. [PubChem]Pentoxifylline inhibits erythrocyte phosphodiesterase, resulting in an increase in erythrocyte cAMP activity. Subsequently, the erythrocyte membrane becomes more resistant to deformity. Along with erythrocyte activity, pentoxifylline also decreases blood viscosity by reducing plasma fibrinogen concentrations and increasing fibrinolytic activity. It is also a non selective adenosine receptor antagonist.
N-Desmethyldiltiazem is a metabolite of diltiazem. Diltiazem is a nondihydropyridine (non-DHP) member of the class of drugs known as calcium channel blockers, used in the treatment of hypertension, angina pectoris, and some types of arrhythmia. It is also an effective preventive medication for migraine. It is a class 3 antianginal drug, and a class IV antiarrhythmic. It is a common adulterant of cocaine seized in the UK, and has been found to reduce cocaine cravings in rats, indicating it may prolong the 'high'. (Wikipedia)
Maltohexaose is a polysaccharide with 6 units of glucose and can be classified as a maltodextrin. Maltodextrin is a polysaccharide that is used as a food additive. It is produced from starch by partial hydrolysis and is usually found as a creamy-white hygroscopic spray-dried powder. Maltodextrin is easily digestible, being absorbed as rapidly as glucose, and might be either moderately sweet or almost flavourless. It is commonly used for the production of natural sodas and candy such as SweeTarts. Maltodextrin consists of D-glucose units connected in chains of variable length. The glucose units are primarily linked with α(1→4) glycosidic bonds. Maltodextrin is typically composed of a mixture of chains that vary from three to nineteen glucose units long. Maltodextrins are classified by DE (dextrose equivalent) and have a DE between 3 to 20. The higher the DE value, the shorter the glucose chains, and the higher the sweetness and solubility. Above DE 20, the European Union's CN code calls it glucose syrup, at DE 10 or lower the customs CN code nomenclature classifies maltodextrins as dextrins (Wikipedia). A 1,4-alpha-D-glucan reacts with H2O to produce maltohexaose. alpha-Amylase is responsible for catalyzing this reaction.
Maltoheptaose is a polysaccharide with 7 units of glucose and can be classified as a maltodextrin. Maltodextrin is a polysaccharide that is used as a food additive. It is produced from starch by partial hydrolysis and is usually found as a creamy-white hygroscopic spray-dried powder. Maltodextrin is easily digestible, being absorbed as rapidly as glucose, and might be either moderately sweet or almost flavourless. It is commonly used for the production of natural sodas and candy such as SweeTarts. Maltodextrin consists of D-glucose units connected in chains of variable length. The glucose units are primarily linked with α(1→4) glycosidic bonds. Maltodextrin is typically composed of a mixture of chains that vary from three to nineteen glucose units long. Maltodextrins are classified by DE (dextrose equivalent) and have a DE between 3 to 20. The higher the DE value, the shorter the glucose chains, and the higher the sweetness and solubility. Above DE 20, the European Union's CN code calls it glucose syrup, at DE 10 or lower the customs CN code nomenclature classifies maltodextrins as dextrins (Wikipedia).
2,3-Butanediol is an isomer of butanediol. The 2R,3R stereoisomer of 2,3-butanediol is produced by a variety of microorganisms, in a process known as butanediol fermentation. 2,3-Butanediol fermentation is the anaerobic fermentation of glucose with 2,3-butanediol as one of the end products. The overall stoichiometry of the reaction is 2 pyruvate + NADH --> 2CO2 + 2,3-butanediol. Butanediol fermentation is typical for Enterobacter species or microbes found in the gut. 2,3-butanediol has been identified in the sera of alcoholics and it may be a specific marker of alcohol abuse (PMID:6139706). In humans, 2,3-butanediol is oxidized to acetyl-CoA via acetoin. 2,3-Butanediol is also found in cocoa butter. 2,3-Butanediol can also be found in Bacillus, Klebsiella and Serratia (PMID:21272631).
DG(14:0/18:0/0:0) is a diglyceride, or a diacylglycerol (DAG). It is a glyceride consisting of two fatty acid chains covalently bonded to a glycerol molecule through ester linkages. Diacylglycerols can have many different combinations of fatty acids attached at both the C-1 and C-2 positions. DG(14:0/18:0/0:0), in particular, consists of one chain of myristic acid at the C-1 position and one chain of stearic acid at the C-2 position. The myristic acid moiety is derived from nutmeg and butter, while the stearic acid moiety is derived from animal fats, coco butter and sesame oil. Mono- and diacylglycerols are common food additives used to blend together certain ingredients, such as oil and water, which would not otherwise blend well. Dacylglycerols are often found in bakery products, beverages, ice cream, chewing gum, shortening, whipped toppings, margarine, and confections. Synthesis of diacylglycerol begins with glycerol-3-phosphate, which is derived primarily from dihydroxyacetone phosphate, a product of glycolysis (usually in the cytoplasm of liver or adipose tissue cells). Glycerol-3-phosphate is first acylated with acyl-coenzyme A (acyl-CoA) to form lysophosphatidic acid, which is then acylated with another molecule of acyl-CoA to yield phosphatidic acid. Phosphatidic acid is then de-phosphorylated to form diacylglycerol.Diacylglycerols are precursors to triacylglycerols (triglyceride), which are formed by the addition of a third fatty acid to the diacylglycerol under the catalysis of diglyceride acyltransferase. Since diacylglycerols are synthesized via phosphatidic acid, they will usually contain a saturated fatty acid at the C-1 position on the glycerol moiety and an unsaturated fatty acid at the C-2 position.
(±)-1-Phenyl-1-propanol is a flavouring ingredien
N-Acetyl-L-glutamate 5-semialdehyde is an intermediate in Urea cycle and metabolism of amino groups. N-Acetyl-L-glutamate 5-semialdehyde is the. second to last step in the synthesis of L-Ornithine and is converted. from N-Acetyl-L-glutamate 5-phosphate via the enzyme N-acetyl-gamma-glutamyl-phosphate reductase (EC 1.2.1.38). It is then converted to N-Acetylornithine via the enzyme acetylornithine aminotransferase (EC 2.6.1.11).
N-Acetyl-L-glutamate 5-semialdehyde is an intermediate in Urea cycle and metabolism of amino groups. N-Acetyl-L-glutamate 5-semialdehyde is the. second to last step in the synthesis of L-Ornithine and is converted. from N-Acetyl-L-glutamate 5-phosphate via the enzyme N-acetyl-gamma-glutamyl-phosphate reductase (EC 1.2.1.38). It is then converted to N-Acetylornithine via the enzyme acetylornithine aminotransferase (EC 2.6.1.11).
Asiaticoside is found in green vegetables. Asiaticoside is a constituent of Centella asiatica (Asiatic pennywort)
Taurocholic acid is a bile acid and is the product of the conjugation of cholic acid with taurine. Its sodium salt is the chief ingredient of the bile of carnivorous animals. Bile acids are steroid acids found predominantly in the bile of mammals. The distinction between different bile acids is minute, depending only on the presence or absence of hydroxyl groups on positions 3, 7, and 12. Bile acids are physiological detergents that facilitate excretion, absorption, and transport of fats and sterols in the intestine and liver. Bile acids are also steroidal amphipathic molecules derived from the catabolism of cholesterol. They modulate bile flow and lipid secretion, are essential for the absorption of dietary fats and vitamins, and have been implicated in the regulation of all the key enzymes involved in cholesterol homeostasis. Bile acids recirculate through the liver, bile ducts, small intestine, and portal vein to form an enterohepatic circuit. They exist as anions at physiological pH, and consequently require a carrier for transport across the membranes of the enterohepatic tissues. The unique detergent properties of bile acids are essential for the digestion and intestinal absorption of hydrophobic nutrients. Bile acids have potent toxic properties (e.g. membrane disruption) and there are a plethora of mechanisms to limit their accumulation in blood and tissues (PMID: 11316487, 16037564, 12576301, 11907135). Taurocholic acid, as with all bile acids, acts as a detergent to solubilize fats for absorption and is itself absorbed. It is used as a cholagogue and choleretic (a bile purging agent). Hydrolysis of taurocholic acid yields taurine, a nonessential amino acid. Taurocholic acid is one of the main components of urinary nonsulfated bile acids in biliary atresia. Raised levels of taurocholate in fetal serum in obstetric cholestasis may result in the development of a fetal dysrhythmia and sudden intra-uterine death (PMID: 3944741, 11256973).
1,25-Dihydroxyvitamin D3-26,23-lactone (1,25(OH)2D3-26,23-lactone) is a vitamin D3 metabolite. The formation of 1,25(OH)2D3-26,23-lactone occurs in normocalcemic states and in situations in which 1,25(OH)2D3 has been administered. (PMID: 6324253). 1,25-dihydroxyvitamin D3 and (23S)-1,23,25-trihydroxyvitamin D3 are efficient precursors to 1,25(OH)2D3-26,23-lactone. 1,25(OH)2D3-26,23-lactone has an inhibitory action of bone resorption and the lactone ring plays a major part in its expression. (PMID: 6548386, 1666030).
3b,15b,17a-Trihydroxy-pregnenone is a major 15 beta-hydroxylated metabolite unique to the human perinatal period. (PMID 8750436). The chemical synthesis of 15&#946;-hydroxylated steroids is for use in the (a) development of new immunoassay techniques for application to newborn screening programs and fetal well-being; (b) development of new anti-androgenic drugs; and (c) study of androgen/estrogen interaction in late pregnancy.
3-Hydroxyvaleric acid may be products of the condensation of propionyl-CoA with acetyl-CoA catalyzed by 3-oxoacyl-CoA thiolases. An increase amount of 3-hydroxyvaleric acid can be found in methylmalonic acidemia and propionic acidemia. (PMID: 630060).
6Z,9Z-octadecadienoic acid is also known as Isolinoleic acid or C18:2(6Z,9Z).  6Z,9Z-octadecadienoic acid is considered to be practically insoluble (in water) and acidic.  6Z,9Z-octadecadienoic acid is a fatty acid lipid molecule
Adipoyl-CoA is formed as the degradation beta-oxidation product (CoA ester) of the dicarboxylic acid formed via w-oxidation of fatty acids in the endoplasmic reticulum. Fatty acid oxidation is an important source of energy, especially during fasting and diabetes. Although mitochondria are considered the primary site for beta-oxidation of fatty acids for energy utilization, peroxisomes play a key role in the metabolism of a variety of lipids such as very long-chain fatty acids, branched-chain fatty acids, dicarboxylic fatty acids, bile acid intermediates, prostaglandins, leukotrienes, thromboxanes, pristanic acid, and xenobiotic carboxylic acids. Acyl-CoA thioesterases (ACOTs) are a family of enzymes that catalyze the hydrolysis of the CoA esters of various lipids to the free acids and coenzyme A. Acyl-CoA hydrolase 8 (ACOT8, EC 3.1.2.20) preferentially hydrolyzes medium-chain dicarboxylyl-CoA esters such as Adipoyl-CoA and is responsible for the termination of beta-oxidation of dicarboxylic acids of medium-chain length with the concomitant release of the corresponding free acids. In mitochondria, Adipoyl-CoA is a substrate of the enzyme Hydroxymethylglutarate coenzyme A-transferase (E.C. 2.8.3.13). Both synthesis and degradation of dicarboxylic acids occur mainly in kidney and liver, and the chain-shortened dicarboxylic acids are excreted in the urine as the free acids. (PMID: 16141203).
Esterase belongs to alkaloids and derivatives class of compounds. Those are naturally occurring chemical compounds that contain mostly basic nitrogen atoms. This group also includes some related compounds with neutral and even weakly acidic propertiesand is also some synthetic compounds of similar structure are attributed to alkaloids. In addition to carbon, hydrogen and nitrogen, alkaloids may also contain oxygen, sulfur and more rarely other elements such as chlorine, bromine, and phosphorus. Esterase can be found in a number of food items such as fig, cabbage, wild leek, and white cabbage, which makes esterase a potential biomarker for the consumption of these food products. A wide range of different esterases exist that differ in their substrate specificity, their protein structure, and their biological function .
Propylhexedrine is only found in individuals that have used or taken this drug. It is an alpha-adrenergic agonist often used in nasal decongestant inhalers. It is used to give temporary relief for nasal congestion from colds, allergic rhinitis, or allergies. Propylhexidrine causes the norepinephrine, dopamine, and serotonin (5HT) transporters to reverse their direction of flow. This inversion leads to a release of these transmitters from the vesicles to the cytoplasm and from the cytoplasm to the synapse. It also antagonizes the action of VMAT2, causing the release of more neurotransmitters.
2-Methoxy-(3 or 5 or 6)-isopropylpyrazine is used as a food additive [EAFUS] ("EAFUS: Everything Added to Food in the United States. [http://www.eafus.com/]")
Hetacillin is a penicillin beta-lactam antibiotic used in the treatment of bacterial infections caused by susceptible, usually gram-positive, organisms. The name 'penicillin' can either refer to several variants of penicillin available, or to the group of antibiotics derived from the penicillins. Hetacillin has in vitro activity against gram-positive and gram-negative aerobic and anaerobic bacteria. The bactericidal activity of Hetacillin results from the inhibition of cell wall synthesis and is mediated through Hetacillin binding to penicillin binding proteins (PBPs).
1,2,3-Trihydroxybenzene, or pyrogallol is a benzenetriol. It is a white crystalline powder and a powerful reducing agent. It was first prepared by Scheele 1786 by heating gallic acid. An alternate preparation is heating para-chlorophenoldisulphonic acid with potassium hydroxide. 1,2,3-Trihydroxybenzene has been found to be a metabolite of Aspergillus (https://www.tandfonline.com/doi/pdf/10.1080/00021369.1982.10865473).
Selenium, also known as se(2-) or selenide ion, is a member of the class of compounds known as homogeneous other non-metal compounds. Homogeneous other non-metal compounds are inorganic non-metallic compounds in which the largest atom belongs to the class of 'other nonmetals'. Selenium can be found in a number of food items such as root vegetables, oxheart cabbage, persimmon, and irish moss, which makes selenium a potential biomarker for the consumption of these food products. Selenium exists in E.coli (prokaryote) and yeast (eukaryote). Selenium salts are toxic in large amounts, but trace amounts are necessary for cellular function in many organisms, including all animals. Selenium is an ingredient in many multivitamins and other dietary supplements, including infant formula. It is a component of the antioxidant enzymes glutathione peroxidase and thioredoxin reductase (which indirectly reduce certain oxidized molecules in animals and some plants). It is also found in three deiodinase enzymes, which convert one thyroid hormone to another. Selenium requirements in plants differ by species, with some plants requiring relatively large amounts and others apparently requiring none .
5,6-Dihydro-5-hydroxy-6-methyl-2H-pyran-2-one is found in beverages. 5,6-Dihydro-5-hydroxy-6-methyl-2H-pyran-2-one is found in kava (Piper methysticum). FDA advises against use of kava in food due to potential risk of severe liver damag
17beta-Estradiol 3-glucuronide belongs to the class of organic compounds known as steroid glucuronide conjugates. These are sterol lipids containing a glucuronide moiety linked to the steroid skeleton. 17beta-Estradiol 3-glucuronide is a very hydrophobic molecule, practically insoluble (in water), and relatively neutral. Estradiol glucuronide is believed to play an important role in the mechanism of 17beta-estradiol(E2)-mediated tumour formation. Conjugation with glucuronic acid lowers tissue levels by facilitating excretion. Heterotropic activation by daidzein appears to be specific for the glucuronidation of E2 because daidzein did not affect the glucuronidation of the 2- and 4-hydroxy metabolites of E2 (PMID: 16598814).
Terretonin is a mycotoxin of the common soil organism Aspergillus terreus. It is isolated from A. terreus infected ha
Isomammein is found in fruits. Isomammein is a constituent of Mammea americana (mamey) seeds
Mequitazine is a histamine H1 antagonist (antihistamine). It competes with histamine for the normal H1-receptor sites on effector cells of the gastrointestinal tract, blood vessels and respiratory tract. It provides effective, temporary relief of sneezing, watery and itchy eyes, and runny nose due to hay fever and other upper respiratory allergies.
3,4-Dihydroxy-tamoxifen is a metabolite of tamoxifen. Tamoxifen is an antagonist of the estrogen receptor in breast tissue via its active metabolite, hydroxytamoxifen. In other tissues such as the endometrium, it behaves as an agonist, and thus may be characterized as a mixed agonist/antagonist. Tamoxifen is the usual endocrine therapy for hormone receptor-positive breast cancer in pre-menopausal women, and is also a standard in post-menopausal women although aromatase inhibitors are also frequently used in that setting. (Wikipedia)
4,5-Dihydropiperlonguminine is found in herbs and spices. 4,5-Dihydropiperlonguminine is an alkaloid from fruits of Piper longum (long pepper).
2-Hydroxy-3-methylpentanoic acid or 2-hydroxy-3-methylvaleric acid (HMVA) is an organic acid generated by L-isoleucine metabolism. It is derived from the reduction of 2-Keto-3-methylvaleric acid (KMVA), possibly through the action of a lactate dehydrogenase (PMID: 1429566). There are 4 stereoisomers of HMVA (2S,3S-HMVA, 2R,3R-HMVA, 2S,3R-HMVA and 2R,3S-HMVA), of which the 2S,3S and 2S,3R derivatives are generally separable. HMVA is found in the urine and blood of normal individuals but in very elevated levels in patients with maple syrup urine disease (MSUD) (PMID: 1429566). Maple syrup urine disease (MSUD) is an inherited metabolic disease predominantly characterized by neurological dysfunction including psychomotor/delay/mental retardation.
N-Acetylanonaine is found in fruits. N-Acetylanonaine is an alkaloid from the root bark of Zanthoxylum simulans (Szechuan pepper
Quinine is an alkaloid derived from the bark of the cinchona tree. It is used as an antimalarial drug, and is the active ingredient in extracts of the cinchona that have been used for that purpose since before 1633. Quinine is also a mild antipyretic and analgesic and has been used in common cold preparations for that purpose. It was used commonly and as a bitter and flavoring agent, and is still useful for the treatment of babesiosis. Quinine is also useful in some muscular disorders, especially nocturnal leg cramps and myotonia congenita, because of its direct effects on muscle membrane and sodium channels. The mechanisms of its antimalarial effects are not well understood. [PubChem].
Anguidol is produced by Fusarium roseum, Fusarium equiseti and Fusarium sporotrichiella. Mycotoxi
Sibutramine (trade name Meridia in the USA, Reductil in Europe and other countries), usually as sibutramide hydrochloride monohydrate, is an orally administered agent for the treatment of obesity. It is a centrally acting stimulant chemically related to amphetamines. Sibutramine is classified as a Schedule IV controlled substance in the United States. In October 2010, Sibutramine was withdrawn from Canadian and U.S. markets due to concerns that the drug increases the risk of heart attack and stroke in patients with a history of heart disease.
Glycyrrhetinic acid is a pentacyclic triterpenoid derivative of the beta-amyrin type obtained from the hydrolysis of glycyrrhizic acid, which was first obtained from the herb liquorice. It is used in flavouring and it masks the bitter taste of drugs like aloe and quinine. It is effective in the treatment of peptic ulcer and also has expectorant (antitussive) properties (PMID:32106571). In glycyrrhetinic acid the functional group (R) is a hydroxyl group. Research in 2005 demonstrated that with a proper functional group a very effective glycyrrhetinic artificial sweetener can be obtained. When R is an anionic NHCO(CH2)CO2K side chain, the sweetening effect is found to 1200 times that of sugar (human sensory panel data). A shorter or longer spacer reduces the sweetening effect. One explanation is that the taste bud cell receptor has 1.3 nanometers (13 angstroms) available for docking with the sweetener molecule. In addition the sweetener molecule requires three proton donor positions of which two reside at the extremities to be able to interact efficiently with the receptor cavity.
Pentadecanoic acid, also known as pentadecylic acid or C15:0, belongs to the class of organic compounds known as long-chain fatty acids. These are fatty acids with an aliphatic tail that contains between 13 and 21 carbon atoms. Pentadecanoic acid (its ester is called pentadecanoate) is a saturated fatty acid that has 15 carbons and is therefore a very hydrophobic molecule that is practically insoluble in water.  Pentadecanoic acid is found in plants and ruminants. Many "odd" length long-chain fatty acids, such as pentadecanoic acid, are derived from the consumption of cattle fats (milk and meat). Pentadecanoic acid constitutes 1.05% of milk fat and 0.43% of ruminant meat fat. The content of pentadecanoic acid in the subcutaneous adipose tissue of humans appears to be a good biological marker of long-term milk fat intake in free-living individuals in populations with high consumption of dairy products. (PMID: 9701185; PMID: 11238766).
A class I anti-arrhythmic agent (one that interferes directly with the depolarization of the cardiac membrane and thus serves as a membrane-stabilizing agent) with a depressant action on the heart similar to that of guanidine. It also possesses some anticholinergic and local anesthetic properties. [PubChem]
2-pentanamido-3-phenylpropanoic acid is classified as a phenylalanine or a Phenylalanine derivative. Phenylalanines are compounds containing phenylalanine or a derivative thereof resulting from reaction of phenylalanine at the amino group or the carboxy group, or from the replacement of any hydrogen of glycine by a heteroatom. 2-pentanamido-3-phenylpropanoic acid is considered to be a practically insoluble (in water) and a weak acidic compound. 2-pentanamido-3-phenylpropanoic acid can be found in feces.
Diacetone alcohol is found in fruits. Diacetone alcohol is isolated from the arctic bramble Rubus arcticu
Liqcoumarin is found in herbs and spices. Liqcoumarin is isolated from Glycyrrhiza glabra (licorice
Tyramine is a monoamine compound derived from the amino acid tyrosine. Tyramine is metabolized by the enzyme monoamine oxidase. In foods, it is often produced by the decarboxylation of tyrosine during fermentation or decay. Foods containing considerable amounts of tyramine include fish, chocolate, alcoholic beverages, cheese, soy sauce, sauerkraut, and processed meat. A large dietary intake of tyramine can cause an increase in systolic blood pressure of 30 mmHg or more. Tyramine acts as a neurotransmitter via a G protein-coupled receptor with high affinity for tyramine called TA1. The TA1 receptor is found in the brain as well as peripheral tissues including the kidney. An indirect sympathomimetic, Tyramine can also serve as a substrate for adrenergic uptake systems and monoamine oxidase so it prolongs the actions of adrenergic transmitters. It also provokes transmitter release from adrenergic terminals. Tyramine is a biomarker for the consumption of cheese
Procyanidins are a subclass of flavonoids found in commonly consumed foods such as red wine, chocolate, cranberry juice and apples and have gain attraction for their potential health benefits.
Sclareol is found in alcoholic beverages. Sclareol is a constituent of Salvia sclarea (clary sage)
Hypogeic acid is a fatty acids found in human milk Approximately 50% of the dietary calories in human milk are supplied to new-borns as fat. More than 98% of this milk fat is in the form of triglycerides, which contain fatty acid glycerol esters. Fatty acid composition in human milk changes in colostrum, transitional milk and mature milk. Knowledge of fatty acid composition of human milk is of importance for the manufacture of infant formulas, determination of the influence of diet in fatty acid composition of human milk and changes in composition with lactation. (CAN 136:246580, AN 2002:67899).
Scopolamine, also known as hyoscine, is a tropane alkaloid drug obtained from plants of the family Solanaceae (nightshades), such as henbane or jimson weed (Datura species). It is part of the secondary metabolites of plants. Scopolamine is used criminally as a date rape drug and as an aid to robbery, the most common act being the clandestine drugging of a victim's drink. It is preferred because it induces retrograde amnesia, or an inability to recall events prior to its administration. Victims of this crime are often admitted to a hospital in police custody, under the assumption that the patient is experiencing a psychotic episode. A telltale sign is a fever accompanied by a lack of sweat. An alkaloid from Solanaceae, especially Datura metel L. and Scopola carniolica. Scopolamine and its quaternary derivatives act as antimuscarinics like atropine, but may have more central nervous system effects. Among the many uses are as an anesthetic premedication, in urinary incontinence, in motion sickness, as an antispasmodic, and as a mydriatic and cycloplegic.
Norepinephrine is the precursor of epinephrine that is secreted by the adrenal medulla and is a widespread central and autonomic neurotransmitter. Norepinephrine is the principal transmitter of most postganglionic sympathetic fibers and of the diffuse projection system in the brain arising from the locus ceruleus. It is also found in plants and is used pharmacologically as a sympathomimetic. Norepinephrine is elevated in the urine of people who consume bananas. Norepinephrine is also a microbial metabolite; urinary noradrenaline is produced by Escherichia, Bacillus, and Saccharomyces (PMID: 24621061). Norepinephrine is found in alcoholic beverages, banana peels and pulp (Musa paradisiaca), red plum fruit (Prunus domestica), orange pulp (Citrus sinensis), potato tubers (Solanum tuberosum), and whole purslane (Portulaca oleracea). P. oleracea is the richest of these sources. Norepinephrine has also been identified as a uremic toxin according to the European Uremic Toxin Working Group (PMID: 22626821).
3b,15b,17a-Trihydroxy-pregnenone is a major 15 beta-hydroxylated metabolite unique to the human perinatal period. (PMID 8750436). The chemical synthesis of 15&#946;-hydroxylated steroids is for use in the (a) development of new immunoassay techniques for application to newborn screening programs and fetal well-being; (b) development of new anti-androgenic drugs; and (c) study of androgen/estrogen interaction in late pregnancy.
N-Acetyldopamine also known as NADA is an acetylated form of dopamine. It is an endogenously produced derivative or metabolite of dopamine. It belongs to the family of compounds known as catecholamines and derivatives. These are compounds containing 4-(2-aminoethyl) pyrocatechol [4-(2-aminoethyl) benzene-1,2-diol] or a derivative thereof. While NADA has been found in the human liver, kidney, and urine, it is unclear what its role is in mammal physiology (PMID: 16179545). NADA exists in both free and conjugated (glucuronide) forms. Conjugated NADA accounts for about 90% of the total excretion of NADA. Urinary excretion of total N-acetyldopamine averages 0.485 micromoles/day in healthy humans (PMID: 6513727). The concentration of NADA is thirteen times higher in children with neuroblastoma than in normal subjects (PMID: 1321164). NADA is known to be a sepiapterin reductase inhibitor (PMID: 16179545). N-acetyldopamine has been shown to inhibit lipopolysaccharide-induced lipid peroxidation in rat brains (PMID: 16179545).
3,4-Dihydroxybenzaldehyde, also known as protocatechuic aldehyde, is a phenolic aldehyde, a compound released from cork stoppers into wine. This molecule can be used as a precursor in vanillin synthesis via biotransformation by cell cultures of Capsicum frutescens, a type of chili pepper. It is also found in the mushroom Phellinus linteus (Wikipedia).
Dityrosine is a fluorescent molecule formed as a result of normal posttranslational processing. In many structural proteins, dityrosine confers resistance to proteolysis and physicochemical trauma as a stabilizing crosslink. Dityrosine has also been found in oxidative/nitrative stress under a variety of conditions and biological systems. In this regard, it has been used as an important biomarker for oxidatively modified proteins during UV and gamma-irradiation, aging, and exposure to oxygen free radicals, nitrogen dioxide, peroxynitrite, and lipid hydroperoxides. Renewed interest in dityrosine and other tyrosine oxidation products as clinical indicators of oxidative modification has driven the development of important techniques for the specific analysis and quantification of these molecules. The presence of elevated levels of dityrosine in mammalian tissue and urine samples has been measured by chromatographic separation followed by mass spectrometry GC-MS and HPLC-MS/MS. Increases in dityrosine levels have been associated with pathologies such as eye cataracts, atherosclerosis, acute inflammation, and Alzheimer's disease. The continued development of, and increased accessibility to, improved mass spectrometric instrumentation will expand the capability, feasibility, and sensitivity with which specific biomarkers like dityrosine can be measured. (PMID: 17019703).
4-Methylcatechol, also known as homocatechol or toluene-3,4-diol, belongs to the class of organic compounds known as catechols. Catechols are compounds containing a 1,2-benzenediol moiety. Outside of the human body, 4-Methylcatechol is found, on average, in the highest concentration within a few different foods such as coffee and cocoa powders and in a lower concentration in beers. 4-Methylcatechol has also been detected, but not quantified in eggplants. This could make 4-methylcatechol a potential biomarker for the consumption of these foods. Recent studies have suggested that a lack of brain-derived neurotrophic factor (BDNF) in the limbic system may cause neuropathic pain (PMID:22198556). It is both a substrate and a suicide inhibitor of catechol 2,3-dioxygenase (PMID:15006807). 4-Methylcatechol is a metabolite of homoprotocatechuic acid (PMID:4974346). 4-Methylcatechol is known to induce the production of BDNF.
Procarbazine is only found in individuals that have used or taken this drug. It is an antineoplastic agent used primarily in combination with mechlorethamine, vincristine, and prednisone (the MOPP protocol) in the treatment of Hodgkin's disease. [PubChem]The precise mode of cytotoxic action of procarbazine has not been clearly defined. There is evidence that the drug may act by inhibition of protein, RNA and DNA synthesis. Studies have suggested that procarbazine may inhibit transmethylation of methyl groups of methionine into t-RNA. The absence of functional t-RNA could cause the cessation of protein synthesis and consequently DNA and RNA synthesis. In addition, procarbazine may directly damage DNA. Hydrogen peroxide, formed during the auto-oxidation of the drug, may attack protein sulfhydryl groups contained in residual protein which is tightly bound to DNA.
Preservative. Ethylenediaminetetraacetic acid, widely abbreviated as EDTA, is a polyamino carboxylic acid and a colourless, water-soluble solid. Its conjugate base is named ethylenediaminetetraacetate. It is widely used to dissolve limescale. Its usefulness arises because of its role as a hexadentate (six-toothed") ligand and chelating agent
Aflatoxins are naturally occurring mycotoxins that are produced by many species of Aspergillus, a fungus. At least 13 different types of aflatoxin are produced in nature. Aflatoxin B1 is considered the most toxic and is produced by both Aspergillus flavus and Aspergillus parasiticus. The native habitat of Aspergillus is in soil, decaying vegetation, hay, and grains undergoing microbiological deterioration and it invades all types of organic substrates whenever conditions are favourable for its growth. Favourable conditions include high moisture content (at least 7%) and high temperature. Aflatoxins B1 (AFB1) are contaminants of improperly stored foods; they are potent genotoxic and carcinogenic compounds, exerting their effects through damage to DNA. They can also induce mutations that increase oxidative damage (PMID: 17214555). Crops which are frequently affected by Aspergillus contamination include cereals (maize, sorghum, pearl millet, rice, wheat), oilseeds (peanut, soybean, sunflower, cotton), spices (chile peppers, black pepper, coriander, turmeric, ginger), and tree nuts (almond, pistachio, walnut, coconut, brazil nut).
Pectenotoxin 4 is found in mollusks. Pectenotoxin 4 is from Dinophysis acuminata. Shellfish toxin.
Sulfamethazine is only found in individuals that have used or taken this drug. It is a sulfanilamide anti-infective agent. It has a spectrum of antimicrobial action similar to other sulfonamides. [PubChem]Sulfonamides inhibit the enzymatic conversion of pteridine and p-aminobenzoic acid (PABA) to dihydropteroic acid by competing with PABA for binding to dihydrofolate synthetase, an intermediate of tetrahydrofolic acid (THF) synthesis. THF is required for the synthesis of purines and dTMP and inhibition of its synthesis inhibits bacterial growth. Pyrimethamine and trimethoprim inhibit dihydrofolate reductase, another step in THF synthesis, and therefore act synergistically with the sulfonamides.
Melibiose (CAS: 585-99-9) is a disaccharide consisting of one galactose and one glucose moiety in an alpha (1-6) glycosidic linkage. This sugar is produced and metabolized only by enteric and lactic acid bacteria and other microbes, such as Dickeya dadantii, Escherichia, Leuconostoc, and Saccharomyces (PMID: 19734309, 28453942). It is not an endogenous metabolite but may be obtained from the consumption of partially fermented molasses, brown sugar, or honey. Antibodies to melibiose will appear in individuals affected by Chagas' disease (Trypanosoma cruzi infection). Melibiose is not metabolized by humans but can be broken down by gut microflora, such as E. coli. In fact, E. coli is able to utilize melibiose as a sole source of carbon. Melibiose is first imported by the melibiose permease, MelB and then converted into β-D-glucose and β-D-galactose by the α-galactosidase encoded by melA. Because of its poor digestibility, melibiose (along with rhamnose) can be used together for noninvasive intestinal mucosa barrier testing. This test can be used to assess malabsorption or impairment of intestinal permeability. Recent studies with dietary melibiose have shown that it can strongly affect the Th cell responses to an ingested antigen. It has been suggested that melibiose could be used to enhance the induction of oral tolerance (PMID: 17986780).
5-Hydroxydantrolene is a metabolite of dantrolene. Dantrolene sodium is a muscle relaxant that acts by abolishing excitation-contraction coupling in muscle cells, probably by action on the ryanodine receptor. It is the only specific and effective treatment for malignant hyperthermia, a rare, life-threatening disorder triggered by general anesthesia. (Wikipedia)
Tryptophanamide is a substrate for tryptophan aminopeptidase (EC: 3.5.1.57)and is converted to L-Tryptophan via enzymatic hydrolysis.
Naphazoline is only found in individuals that have used or taken this drug. It is a rapid acting sympathomimetic vasoconstrictor of occular artierioles. It acts to decrease congestion of the conjunctiva and is found in many over-the-counter eye drops.Naphazoline is a direct acting sympathomimetic drug, which acts on alpha-adrenergic receptors in the arterioles of the nasal mucosa. This activates the adrenal system to yield systemic vasoconstrction. In producing vasoconstriction, the result is a decrease in blood flow in the nasal passages and consequently decreased nasal congestion. The vasoconstriction means that there is less pressure in the capillaries and less water can filter out, thus less discharge is made.
It is used in foods as a nutritional source of Mg and P, pH control agent, dietary supplement, flow aid and leavening agent
Adenosine 3', 5'-diphosphate or PAP is a nucleotide that is closely related to ADP. It has two phosphate groups attached to the 5' and 3' positions of the pentose sugar ribose (instead of pyrophosphoric acid at the 5' position, as found in ADP), and the nucleobase adenine. PAP is converted to PAPS by Sulfotransferase and then back to PAP after the sulfotransferase reaction. Sulfotransferase (STs) catalyze the transfer reaction of the sulfate group from the ubiquitous donor 3'-phosphoadenosine 5'-phosphosulfate (PAPS) to an acceptor group of numerous substrates. This reaction, often referred to as sulfuryl transfer, sulfation, or sulfonation, is widely observed from bacteria to humans and plays a key role in various biological processes such as cell communication, growth and development, and defense. PAP also appears to a role in bipolar depression. Phosphatases converting 3'-phosphoadenosine 5'-phosphate (PAP) into adenosine 5'-phosphate are of fundamental importance in living cells as the accumulation of PAP is toxic to several cellular systems. These enzymes are lithium-sensitive and we have characterized a human PAP phosphatase as a potential target of lithium therapy.
An inhibitor of alpha glucosidase that retards the digestion and absorption of carbohydrates in the small intestine and hence reduces the increase in blood-glucose concentrations after a carbohydrate load. It is given orally to non-insulin dependent diabetes mellitus patients where diet modification or oral hypoglycemic agents do not control their condition. (From Martindale The Extra Pharmacopoeia, 31st ed)
Nonivamide, also known as pseudocapsaicin or hansaplast, belongs to the class of organic compounds known as methoxyphenols. Methoxyphenols are compounds containing a methoxy group attached to the benzene ring of a phenol moiety. Nonivamide is odorless and a bland tasting compound. Nonivamide is found, on average, in the highest concentration within a few different foods, such as yellow bell peppers, red bell peppers, and pepper (C. frutescens) and in a lower concentration in pepper (C. annuum), orange bell peppers, and green bell peppers. Nonivamide has also been detected, but not quantified, in herbs and spices. This could make nonivamide a potential biomarker for the consumption of these foods. Limited information is available on pharmacokinetics and metabolism of nonivamide. Agonism of the VR1 (TRPV1) (vanilloid) receptor by Nonivamide was demonstrated to induce the release of Ca2+ from the endoplasmic reticulum (ER) of human lung cells, producing ER stress and cell death . The cardiovascular effects are partly explained by substance P release. Administered intraperitoneally, the LD50 in rats was measured to be about 90 mg/kg. Nonivamide has been shown to stimulate afferent neurons with about half the potency of Capsaicin (PMID:6202305).
Lycoperdic acid is found in mushrooms. Lycoperdic acid is isolated from the mushroom Lycoperdon perlatum (common puffball
5,6-Dihydro-4-methoxy-6-[2-(4-methoxyphenyl)ethyl]-2H-pyran-2-one is found in beverages. 5,6-Dihydro-4-methoxy-6-[2-(4-methoxyphenyl)ethyl]-2H-pyran-2-one is a constituent of Piper methysticum (kava). FDA advises against use of kava in food due to potential risk of severe liver damage (2002)
Praziquantel is only found in individuals that have used or taken this drug. It is an anthelmintic used in most schistosome and many cestode infestations. [PubChem]Praziquantel works by causing severe spasms and paralysis of the worms' muscles. This paralysis is accompanied - and probably caused - by a rapid Ca 2+ influx inside the schistosome. Morphological alterations are another early effect of praziquantel. These morphological alterations are accompanied by an increased exposure of schistosome antigens at the parasite surface. The worms are then either completely destroyed in the intestine or passed in the stool. An interesting quirk of praziquantel is that it is relatively ineffective against juvenile schistosomes. While initially effective, effectiveness against schistosomes decreases until it reaches a minimum at 3-4 weeks. Effectiveness then increases again until it is once again fully effective at 6-7 weeks. Glutathione S-transferase (GST), an essential detoxification enzyme in parasitic helminths, is a major vaccine target and a drug target against schistosomiasis. Schistosome calcium ion channels are currently the only known target of praziquantel.
Trehalose 6-phosphate is a substrate for Hexokinase (type I) and Tryptase beta-1. Trehalose 6-phosphate has been found to be a microbial metabolite in Escherichia, Mycobacterium and Saccharomyces (UniProt).
Trehalose 6-phosphate is a substrate for Hexokinase (type I) and Tryptase beta-1. Trehalose 6-phosphate has been found to be a microbial metabolite in Escherichia, Mycobacterium and Saccharomyces (UniProt).
Papaverine is an alkaloid found in opium but not closely related to the other opium alkaloids in its structure or pharmacological actions. It is a direct-acting smooth muscle relaxant used in the treatment of impotence and as a vasodilator, especially for cerebral vasodilation. The mechanism of its pharmacological actions is not clear, but it apparently can inhibit phosphodiesterases and it may have direct actions on calcium channels. [PubChem].
Tyrosol is a phenolic compound present in two of the traditional components of the Mediterranean diet: wine and virgin olive oil. The presence of tyrosol has been described in red and white wines. Tyrosol is also present in vermouth and beer. Tyrosol has been shown to be able to exert antioxidant activity in vitro studies. Oxidation of low-density lipoprotein (LDL) appears to occur predominantly in arterial intimae in microdomains sequestered from antioxidants of plasma. The antioxidant content of the LDL particle is critical for its protection. The ability of tyrosol to bind human LDL has been reported. The bioavailability of tyrosol in humans from virgin olive oil in its natural form has been demonstrated. Urinary tyrosol increases, reaching a peak at 0-4 h after virgin olive oil administration. Men and women show a different pattern of urinary excretion of tyrosol. Moreover, tyrosol is absorbed in a dose-dependent manner after sustained and moderate doses of virgin olive oil. Tyrosol from wine or virgin olive oil could exert beneficial effects on human health in vivo if its biological properties are confirmed (PMID 15134375). Tyrosol is a microbial metabolite found in Bifidobacterium, Escherichia and Lactobacillus (PMID:28393285).
Chemically, clobenzorex is an N-substituted amphetamine analog that is converted to d-amphetamine soon after ingestion. In commercial production, clobenzorex is supplied in 30 mg doses as the hydrochloride salt in green-tinted capsules. The drug gained use as a prescription anorectic in the 1970s; however, adverse reactions were eventually observed, which led to the prohibition of clobenzorex in the United States and certain other countries. Clobenzorex (Asenlix, Dinintel, Finedal, Rexigen) is a stimulant drug of the phenethylamine and amphetamine chemical classes used as an appetite suppressant. The drug is legally distributed in Mexico under the trade name Asenlix by Aventis.
Fosinopril is a phosphinic acid-containing ester prodrug that belongs to the angiotensin-converting enzyme (ACE) inhibitor class of medications. It is rapidly hydrolyzed to fosinoprilat, its principle active metabolite. Fosinoprilat inhibits ACE, the enzyme responsible for the conversion of angiotensin I (ATI) to angiotensin II (ATII). ATII regulates blood pressure and is a key component of the renin-angiotensin-aldosterone system (RAAS). Fosinopril may be used to treat mild to moderate hypertension, as an adjunct in the treatment of congestive heart failure, and to slow the rate of progression of renal disease in hypertensive individuals with diabetes mellitus and microalbuminuria or overt nephropathy.
5-Hydroxydopamine is a naturally occurring amine in human urine. 5-Hydroxydopamine concentration in urine of DOPA treated Parkinson's patients was significantly higher than inpatients not treated or normal controls. (PMID 8255370).
Tomatine is a mildly toxic glycoalkaloid or glycospirosolane (steroidal alkaloids whose structure contains a spirosolane skeleton) found in the stems and leaves of tomato plants as well as in the fruit of unripened (green) tomatoes (up to 500 mg/kg). Red, ripe tomatoes have somewhat reduced amounts of tomatine. A toxic dose of tomatine for an adult human would appear to require the consumption of at least 500 g of tomato leaves in one sitting (“Toxic Plants of North America” (Iowa State University Press, 2001)). Tomatine is known to have fungicidal and antimicrobial properties and is likely produced by tomato plants as a defense against bacteria, fungi, viruses, and insects  (PMID: 19514731). Some microbes produce an enzyme called tomatinase which can degrade tomatine, rendering it ineffective as an antimicrobial (PMID: 18835993).Tomatine has historically been used as a reagent in analytical chemistry for precipitating cholesterol from solution (PMID: 4362143). When lab animals ingest tomatine, essentially all of it passes through the animal unabsorbed. Tomatine apparently binds to cholesterol in the digestive tract, and the largely insoluble combination is excreted — ridding the body of both the alkaloid and cholesterol. Experiments with hamsters have shown that both tomatine-rich green tomatoes and purified tomatine can substantially lower the levels of undesirable LDL cholesterol while maintaining norma
p-Hydroxyphenylacetic acid, also known as 4-hydroxybenzeneacetate, is classified as a member of the 1-hydroxy-2-unsubstituted benzenoids. 1-Hydroxy-2-unsubstituted benzenoids are phenols that are unsubstituted at the 2-position. p-Hydroxyphenylacetic acid is considered to be slightly soluble (in water) and acidic.  p-Hydroxyphenylacetic acid can be synthesized from acetic acid. It is also a parent compound for other transformation products, including but not limited to, methyl 2-(4-hydroxyphenyl)acetate, ixerochinolide, and lactucopicrin 15-oxalate.  p-Hydroxyphenylacetic acid can be found in numerous foods such as olives, cocoa beans, oats, and mushrooms. p-Hydroxyphenylacetic acid can be found throughout all human tissues and in all biofluids. Within a cell, p-hydroxyphenylacetic acid is primarily located in the cytoplasm and in the extracellular space. p-Hydroxyphenylacetic acid is also a microbial metabolite produced by Acinetobacter, Clostridium, Klebsiella, Pseudomonas, and Proteus. Higher levels of this metabolite are associated with an overgrowth of small intestinal bacteria from Clostridia species including C. difficile, C. stricklandii, C. lituseburense, C. subterminale, C. putrefaciens, and C. propionicum (PMID: 476929, 12173102). p-Hydroxyphenylacetic acid is detected after the consumption of whole grain.
Stearaldehyde or octadecanal is a normal long chain fatty aldehyde that can be found in total lipid extracts of muscle tissue. Stearaldehyde can also be found in the plasma of patients with Sjogren-Larsson syndrome. Sjogren-Larsson syndrome (SLS) is an autosomal recessively inherited neurocutaneous disorder caused by a deficiency of the microsomal enzyme fatty aldehyde dehydrogenase (FALDH). (PMID 14564703, 11408337). Octadecanal is often used as the substrate of choice to test FALDH activity in patients suspected of having Sjogren-Larsson syndrome.
Guaifenesin (International Noproprietary Name) or guaiphenesin (former British Approved Name) is an expectorant drug usually taken orally to assist the expectoration ('bringing up') of phlegm from the airways in acute respiratory tract infections. It is a common ingredient in many over-the-counter cough/cold medications. Guaifenesin is also used in the experimental guaifenesin protocol in the treatment of fibromyalgia. It was first approved by the Food and Drug Administration (FDA) in 1952. Guaifenesin works by drawing water into the bronchi. The water both thins mucus and lubricates the airway, facilitating the removal of mucus by coughing.
N-Desmethylpromazine is only found in individuals that have used or taken Promazine. N-Desmethylpromazine is a metabolite of Promazine. N-desmethylpromazine belongs to the family of Phenothiazines. These are polycyclic aromatic compounds containing a phenothiazine moiety, which is a linear tricyclic system that consists of a two benzene rings joined by a para-thiazine ring.
Alprenolol is only found in individuals that have used or taken this drug. It is one of the adrenergic beta-antagonists used as an antihypertensive, anti-anginal, and anti-arrhythmic agent. [PubChem]Alprenolol non-selectively blocks beta-1 adrenergic receptors mainly in the heart, inhibiting the effects of epinephrine and norepinephrine resulting in a decrease in heart rate and blood pressure. Also, with a more minor effect, by binding beta-2 receptors in the juxtaglomerular apparatus, alprenolol inhibits the production of renin, thereby inhibiting angiotensin II and aldosterone production and therefore inhibits the vasoconstriction and water retention due to angiotensin II and aldosterone, respectively.
anhydroretinol, also known as Anhydrovitamin a, is classified as a member of the Sesquiterpenoids. Sesquiterpenoids are terpenes with three consecutive isoprene units
Laudanine is found in opium poppy. Laudanine is an alkaloid from Papaver somniferum (opium poppy
Donepezil metabolite M4 is a metabolite of Donepezil. Donepezil, marketed under the trade name Aricept by its developer Eisai and partner Pfizer, and also marketed under the brand name DONEP by Alkem Pentacare, is a centrally acting reversible acetylcholinesterase inhibitor. Its main therapeutic use is in the palliative treatment of Alzheimer's disease. Common side effects include gastrointestinal upset. It has an oral bioavailability of 100% and easily crosses the blood–brain barrier. Because it has a biological half-life of about 70 hours, it can be taken once a day. (Wikipedia)
Progabide is an analog and prodrug of gamma-aminobutyric acid. It is commonly used in the treatment of epilepsy. It has agonistic activity for both the GABAA and GABAB receptors. Progabide has been investigated for many diseases besides epilepsy, including Parkinson's disease, schizophrenia, clinical depression and anxiety disorder with varying success.
Maslinic acid is a pentacyclic triterpene, found in the non-glyceride fraction of olive pomace oil (Olive pomace oil, also known as "orujo" olive oil, is a blend of refined-pomace oil and virgin olive oil, fit for human consumption). Pentacyclic triterpenes are natural compounds which are widely distributed in plants. These natural products have been demonstrated to possess anti-inflammatory properties. Triterpenoids have been reported to possess antioxidant properties, since they prevent lipid peroxidation and suppress superoxide anion generation. The triterpenes have a history of medicinal use in many Asian countries. Maslinic acid exhibits both pro- and anti-inflammatory properties depending on chemical structure and dose and may be useful in modulating the immune response; further studies are required to confirm the immunomodulatory behaviour of this triterpenoid, and characterise the mechanisms underlying the biphasic nature of some aspects of the inflammatory response. (PMID: 17292619).
Acutoside A is found in fruits. Acutoside A is a constituent of Luffa acutangula (Chinese okra)
Maslinic acid is a pentacyclic triterpene, found in the non-glyceride fraction of olive pomace oil (Olive pomace oil, also known as "orujo" olive oil, is a blend of refined-pomace oil and virgin olive oil, fit for human consumption). Pentacyclic triterpenes are natural compounds which are widely distributed in plants. These natural products have been demonstrated to possess anti-inflammatory properties. Triterpenoids have been reported to possess antioxidant properties, since they prevent lipid peroxidation and suppress superoxide anion generation. The triterpenes have a history of medicinal use in many Asian countries. Maslinic acid exhibits both pro- and anti-inflammatory properties depending on chemical structure and dose and may be useful in modulating the immune response; further studies are required to confirm the immunomodulatory behaviour of this triterpenoid, and characterise the mechanisms underlying the biphasic nature of some aspects of the inflammatory response. (PMID: 17292619).
Maslinic acid is a pentacyclic triterpene, found in the non-glyceride fraction of olive pomace oil (Olive pomace oil, also known as "orujo" olive oil, is a blend of refined-pomace oil and virgin olive oil, fit for human consumption). Pentacyclic triterpenes are natural compounds which are widely distributed in plants. These natural products have been demonstrated to possess anti-inflammatory properties. Triterpenoids have been reported to possess antioxidant properties, since they prevent lipid peroxidation and suppress superoxide anion generation. The triterpenes have a history of medicinal use in many Asian countries. Maslinic acid exhibits both pro- and anti-inflammatory properties depending on chemical structure and dose and may be useful in modulating the immune response; further studies are required to confirm the immunomodulatory behaviour of this triterpenoid, and characterise the mechanisms underlying the biphasic nature of some aspects of the inflammatory response. (PMID: 17292619).
Acutoside A is found in fruits. Acutoside A is a constituent of Luffa acutangula (Chinese okra)
Maslinic acid is a pentacyclic triterpene, found in the non-glyceride fraction of olive pomace oil (Olive pomace oil, also known as "orujo" olive oil, is a blend of refined-pomace oil and virgin olive oil, fit for human consumption). Pentacyclic triterpenes are natural compounds which are widely distributed in plants. These natural products have been demonstrated to possess anti-inflammatory properties. Triterpenoids have been reported to possess antioxidant properties, since they prevent lipid peroxidation and suppress superoxide anion generation. The triterpenes have a history of medicinal use in many Asian countries. Maslinic acid exhibits both pro- and anti-inflammatory properties depending on chemical structure and dose and may be useful in modulating the immune response; further studies are required to confirm the immunomodulatory behaviour of this triterpenoid, and characterise the mechanisms underlying the biphasic nature of some aspects of the inflammatory response. (PMID: 17292619).
Saponin D is a constituent of Hovenia dulcis (raisin tree).
(S)-Spinacine is found in beverages. (S)-Spinacine is isolated from the crab (Crango vulgaris), from the liver of the shark (Acanthias vulgaris) and from spinach. Also isolated from the roots of Panax ginsen
(S)-Spinacine is found in beverages. (S)-Spinacine is isolated from the crab (Crango vulgaris), from the liver of the shark (Acanthias vulgaris) and from spinach. Also isolated from the roots of Panax ginsen
Hydralazine acetone hydrazone is a metabolite of hydralazine. Hydralazine (apresoline) is a direct-acting smooth muscle relaxant used to treat hypertension by acting as a vasodilator primarily in arteries and arterioles. By relaxing vascular smooth muscle, vasodilators act to decrease peripheral resistance, thereby lowering blood pressure and decreasing afterload. (Wikipedia)
Hydralazine pyruvate hydrazone is a metabolite of hydralazine. Hydralazine (apresoline) is a direct-acting smooth muscle relaxant used to treat hypertension by acting as a vasodilator primarily in arteries and arterioles. By relaxing vascular smooth muscle, vasodilators act to decrease peripheral resistance, thereby lowering blood pressure and decreasing afterload. (Wikipedia)
S-(2-carboxypropyl)-Cysteamine enhances the procoagulant activity of factor VIII-East Hartford, a dysfunctional protein due to a light chain thrombin cleavage site mutation (PMID 1569180). S-(2-carboxypropyl)-Cysteamine is known to modify mutant proteins with an arg-to-cys substitution (PMID 1569181).
Colourant for orange skins. Allowed on fruit which is not to be processed. Use prohibited in orange peel for human consumption.
Flavouring agent and nutrient supplement
Norpropoxyphene is a major metabolite of the opioid analgesic drug dextropropoxyphene, and is responsible for many of the side effects associated with use of this drug, especially the unusual toxicity seen during dextropropoxyphene overdose. It has weaker analgesic effects than dextropropoxyphene itself, but is a relatively potent pro-convulsant and blocker of sodium and potassium channels, particularly in heart tissue, which produces prolonged intracardiac conduction time and can lead to heart failure following even relatively minor overdoses. The toxicity of this metabolite makes dextropropoxyphene up to 10 times more likely to cause death following overdose compared to other similar mild opioid analgesics, and has led to dextropropoxyphene being withdrawn from the market in some countries.
Rasagiline is only found in individuals that have used or taken this drug. It is an irreversible inhibitor of monoamine oxidase and is used as a monotherapy in early Parkinson's disease or as an adjunct therapy in more advanced cases.The precise mechanisms of action of rasagiline is unknown. One mechanism is believed to be related to its MAO-B inhibitory activity, which causes an increase in extracellular levels of dopamine in the striatum. The elevated dopamine level and subsequent increased dopaminergic activity are likely to mediate rasagiline's beneficial effects seen in models of dopaminergic motor dysfunction.
(2xi,6xi)-7-Methyl-3-methylene-1,2,6,7-octanetetrol is found in herbs and spices. (2xi,6xi)-7-Methyl-3-methylene-1,2,6,7-octanetetrol is a constituent of Foeniculum vulgare (fennel).
7-Hydroxyoctanoic acid is a normal metabolite of medium-chain fatty acid oxidation, and is excreted in the urine as 7-hydroxyoctanoyl-beta-D-glucuronide (PMID 8799296), and have been found slightly elevated in the urine of persons with abnormal fatty acid metabolism (PMID 2094705).
Prolylproline is a dipeptide composed of proline and proline. It is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis. It is found in urine (PMID: 3782411).
Sedoheptulose (CAS: 3019-74-7) is a ketoheptose, a monosaccharide with seven carbon atoms and a ketone functional group. It is one of the few heptoses found in nature. Sedoheptulose is a seven-carbon ketose sugar originally found in Sedum spectabile, a common perennial garden plant. Later it was shown to be widely distributed in the plants of the Crassulaceae family. The Crassulaceae, or orpine family, is a family of dicotyledons. They store water in their succulent leaves. They are found worldwide, but mostly occur in the northern hemisphere and southern Africa, typically in dry and/or cold areas where water may be scarce. The family includes about 1,400 species in 33 genera. As a result, this sugar is often found to be part of the human diet. This sugar, D-sedoheptulose, is a significant intermediary compound in the cyclic regeneration of D-ribulose. It also plays an important role as a transitory compound in the cyclic regeneration of D-ribulose for carbon dioxide fixation in plant photosynthesis.
5'-O-Desmethyl omeprazole is only found in individuals that have used or taken Omeprazole. 5'-O-Desmethyl omeprazole is a metabolite of Omeprazole. 5'-o-desmethyl omeprazole belongs to the family of Sulfinylbenzimidazoles. These are polycyclic aromatic compounds containing a sulfinyl group attached at the position 2 of a benzimidazole moiety.
Benzoyl glucuronide (Benzoic acid) is a natural human metabolite of Benzoic acid generated in the liver by UDP glucuonyltransferase. Glucuronidation is used to assist in the excretion of toxic substances, drugs or other substances that cannot be used as an energy source. Glucuronic acid is attached via a glycosidic bond to the substance, and the resulting glucuronide, which has a much higher water solubility than the original substance, is eventually excreted by the kidneys.
N'-nitrosonornicotine belongs to the family of Pyrrolidinylpyridines. These are compounds containing a pyrrolidinylpyridine ring system, which consists of a pyrrolidine ring linked to a pyridine ring.
This compound belongs to the family of Nitrobenzenes. These are compounds containing a nitrobenzene moiety, which consists of a benzene ring with a carbon bearing a nitro group.
Inverted or invert sugar syrup is a mixture of glucose and fructose; it is obtained by splitting sucrose into these two components. Compared with its precursor, sucrose, inverted sugar is sweeter and its products tend to remain more moist and are less prone to crystallisation. Inverted sugar is therefore valued by bakers, who refer to the syrup as trimoline or invert syrup. Invert sugar is found in fig and black elderberry.
Misoprostol is only found in individuals that have used or taken this drug. It is a synthetic analog of natural prostaglandin E1. It produces a dose-related inhibition of gastric acid and pepsin secretion, and enhances mucosal resistance to injury. It is an effective anti-ulcer agent and also has oxytocic properties. [PubChem]Misoprostol seems to inhibit gastric acid secretion by a direct action on the parietal cells through binding to the prostaglandin receptor. The activity of this receptor is mediated by G proteins which normally activate adenylate cyclase. The indirect inhibition of adenylate cyclase by Misoprostol may be dependent on guanosine-5&rsquo;-triphosphate (GTP). The significant cytoprotective actions of misoprostol are related to several mechanisms. These include: 1. Increased secretion of bicarbonate, 2. Considerable decrease in the volume and pepsin content of the gastric secretions, 3. It prevents harmful agents from disrupting the tight junctions between the epithelial cells which stops the subsequent back diffusion of H<sup>+</sup> ions into the gastric mucosa, 4. Increased thickness of mucus layer, 5. Enhanced mucosal blood flow as a result of direct vasodilatation, 6. Stabilization of tissue lysozymes/vascular endothelium, 7. Improvement of mucosal regeneration capacity, and 8. Replacement of prostaglandins that have been depleted as a result of various insults to the area. Misoprostol has also been shown to increase the amplitude and frequency of uterine contractions during pregnancy via selective binding to the EP-2/EP-3 prostanoid receptors.
3-p-Coumaroyl-1,5-quinolactone is a polyphenol compound found in foods of plant origin  (PMID: 20428313)
Alclometasone is only found in individuals that have used or taken this drug. It is synthetic glucocorticoid steroid for topical use in dermatology as anti-inflammatory, antipruritic, antiallergic, antiproliferative and vasoconstrictive agent. [Wikipedia]The mechanism of the anti-inflammatory activity of the topical steroids, in general, is unclear. However, corticosteroids are thought to act by the induction of phospholipase A<sub>2</sub> inhibitory proteins, collectively called lipocortins. It is postulated that these proteins control the biosynthesis of potent mediators of inflammation such as prostaglandins and leukotrienes by inhibiting the release of their common precursor, arachidonic acid. Arachidonic acid is released from membrane phospholipids by phospholipase A<sub>2</sub>. Alclometasone initially binds the corticosteroid receptor. This complex migrates to the nucleus where it binds to different glucocorticoid response elements on the DNA. This in turn enhances and represses various genes, especially those involved in inflammatory pathways.
Beclometasone dipropionate is a prodrug of the free form, beclometasone. An anti-inflammatory, synthetic glucocorticoid, it is used topically as an anti-inflammatory agent and in aerosol form for the treatment of asthma. Beclometasone dipropionate is also being investigated for oral treatment in mild-to-moderate Crohn's disease of ileal or ileal-right colonic localisation and for 'topical' use mild-to-moderate graft versus host disease.
beta-O-Methylynephrine is found in citrus. beta-O-Methylynephrine is obtained from tangerine leaves, poss. as artifact.
Methyl 3-carbazolecarboxylate is found in fruits. Methyl 3-carbazolecarboxylate is an alkaloid from the roots of Clausena lansium (wampee
Retinyl beta-glucuronide is a natural human metabolite of retinoic acid generated in the liver by UDP glucuonyltransferase. Glucuronidation is used to assist in the excretion of toxic substances, drugs or other substances that cannot be used as an energy source. Glucuronic acid is attached via a glycosidic bond to the substance, and the resulting glucuronide, which has a much higher water solubility than the original substance, is eventually excreted by the kidneys.
3,4-Hexanedione is a flavouring ingredien
2-Methylglutaric acid, also known as alpha-methylglutarate or 2-methylpentanedioate, belongs to the class of organic compounds known as methyl-branched fatty acids. These are fatty acids with an acyl chain that has a methyl branch. Usually, they are saturated and contain only one or more methyl group. However, branches other than methyl may be present. 2-Methylglutaric acid is also classified as an alpha,omega-dicarboxylic acid. It is glutaric acid substituted at position 2 by a methyl group. 2-Methylglutaric acid arises from the microbial metabolism of the isoprenoid alkaloid pristane (PMID: 4327007; PMID: 20143352).
5-Methylquinoxaline is found in coffee and coffee products. 5-Methylquinoxaline is present in coffee. 5-Methylquinoxaline is a flavouring ingredient.
The thiamin diphosphate (ThDP)-dependent enzyme indolepyruvate decarboxylase (IPDC) is involved in the biosynthetic pathway of the phytohormone 3-indoleacetic acid and catalyzes the nonoxidative decarboxylation of 3-indolepyruvate to 3-indoleacetaldehyde and carbon dioxide. (PMID:15835904)¬† In addition, the enzyme was compared with the phenylpyruvate decarboxylase from Azospirillum brasilense and the indolepyruvate decarboxylase from Enterobacter cloacae. (PMID:21501384) Indole-3-pyruvate is a microbial metabolite, urinary indole-3-pyruvate is produced by Clostridium sporogenes (PMID:29168502) and Trypanasoma brucei (PMID:27856732).
Asparaginylcysteine is a dipeptide composed of asparagine and cysteine. It is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis.
Asparaginylcysteine is a dipeptide composed of asparagine and cysteine. It is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis.
131-hydroxy-magnesium-protoporphyrin ix 13-monomethyl ester is a member of the class of compounds known as metalloporphyrins. Metalloporphyrins are polycyclic compounds containing a porphyrin moiety and a metal atom. 131-hydroxy-magnesium-protoporphyrin ix 13-monomethyl ester is practically insoluble (in water) and a weakly acidic compound (based on its pKa). 131-hydroxy-magnesium-protoporphyrin ix 13-monomethyl ester can be found in a number of food items such as lambsquarters, wheat, sweet basil, and towel gourd, which makes 131-hydroxy-magnesium-protoporphyrin ix 13-monomethyl ester a potential biomarker for the consumption of these food products.
Salbutamol is a short-acting, selective beta2-adrenergic receptor agonist used in the treatment of asthma and COPD. It is 29 times more selective for beta2 receptors than beta1 receptors giving it higher specificity for pulmonary beta receptors versus beta1-adrenergic receptors located in the heart. Salbutamol is formulated as a racemic mixture of the R- and S-isomers. The R-isomer has 150 times greater affinity for the beta2-receptor than the S-isomer and the S-isomer has been associated with toxicity. This lead to the development of levalbuterol, the single R-isomer of salbutamol. However, the high cost of levalbuterol compared to salbutamol has deterred wide-spread use of this enantiomerically pure version of the drug. Salbutamol is generally used for acute episodes of bronchospasm caused by bronchial asthma, chronic bronchitis and other chronic bronchopulmonary disorders such as chronic obstructive pulmonary disorder (COPD). It is also used prophylactically for exercise-induced asthma
beta-O-Methylynephrine is found in citrus. beta-O-Methylynephrine is obtained from tangerine leaves, poss. as artifact.
Melibiose (CAS: 585-99-9) is a disaccharide consisting of one galactose and one glucose moiety in an alpha (1-6) glycosidic linkage. This sugar is produced and metabolized only by enteric and lactic acid bacteria and other microbes, such as Dickeya dadantii, Escherichia, Leuconostoc, and Saccharomyces (PMID: 19734309, 28453942). It is not an endogenous metabolite but may be obtained from the consumption of partially fermented molasses, brown sugar, or honey. Antibodies to melibiose will appear in individuals affected by Chagas' disease (Trypanosoma cruzi infection). Melibiose is not metabolized by humans but can be broken down by gut microflora, such as E. coli. In fact, E. coli is able to utilize melibiose as a sole source of carbon. Melibiose is first imported by the melibiose permease, MelB and then converted into β-D-glucose and β-D-galactose by the α-galactosidase encoded by melA. Because of its poor digestibility, melibiose (along with rhamnose) can be used together for noninvasive intestinal mucosa barrier testing. This test can be used to assess malabsorption or impairment of intestinal permeability. Recent studies with dietary melibiose have shown that it can strongly affect the Th cell responses to an ingested antigen. It has been suggested that melibiose could be used to enhance the induction of oral tolerance (PMID: 17986780).
3'-Methoxyfukiic acid is found in green vegetables. 3'-Methoxyfukiic acid is isolated from Petasites japonicus (sweet coltsfoot
A glucocorticoid with the general properties of corticosteroids. It has been used by mouth in the treatment of all conditions in which corticosteroid therapy is indicated except adrenal-deficiency states for which its lack of sodium-retaining properties makes it less suitable than hydrocortisone with supplementary fludrocortisone. (From Martindale, The Extra Pharmacopoeia, 30th ed, p737)
p-Cresol glucuronide is a glucuronide derivative a p-Cresol that is typically excreted in the urine. P-Cresol (the precursor of p-cresol sulfate (PCS) and p-cresol glucuronide (PCG)) is mainly generated as an end product of tyrosine biotransformation by anaerobic intestinal bacteria. During passage through the colonic mucosa and liver, sulfatation and glucuronidation generates p-Cresol sulfate (as the most preponderant metabolite) and p-Cresol glucuronide (at markedly lower concentrations) (PMID: 23826225). Cresols are known as methylphenols. Cresols are used to dissolve other chemicals, such as disinfectants and deodorizers. They are also used to make specific chemicals that kill insect pests. Cresol solutions are used as household cleaners and disinfectants such as Lysol. Cresol solutions can also be found in photographic developers. In the past, cresol solutions have been used as antiseptics in surgery, but they have been largely displaced in this role by less toxic compounds. Cresols are found in many foods and in wood and tobacco smoke, crude oil, coal tar, and in brown mixtures such as creosote, cresolene and cresylic acids, which are wood preservatives. Microbes in the soil and water produce cresols when they break down materials in the environment. Most exposures to cresols are at very low levels that are not harmful. When cresols are breathed, ingested, or applied to the skin at very high levels, they can be very harmful. Effects observed in people include irritation and burning of skin, eyes, mouth, and throat; abdominal pain and vomiting. Cresols are also a chemical component found in Sharpie Markers. P-cresol is a major component in pig odor.
Olopatadine n-oxide is a metabolite of olopatadine. Olopatadine hydrochloride is an antihistamine (as well as anticholinergic) and mast cell stabilizer, sold as a prescription eye drop (0.2% solution, Pataday, manufactured by Alcon). It is used to treat itching associated with allergic conjunctivitis. Olopatadine hydrochloride 0.1% is sold as Patanol (or Opatanol in some countries). A nasal spray formulation is sold as Patanase, which was approved by the FDA on April 15, 2008. (Wikipedia)
Tranexamic Acid is only found in individuals that have used or taken this drug. It is an antifibrinolytic hemostatic used in severe hemorrhage. [PubChem]Tranexamic acid competitively inhibits activation of plasminogen (via binding to the kringle domain), thereby reducing conversion of plasminogen to plasmin (fibrinolysin), an enzyme that degrades fibrin clots, fibrinogen, and other plasma proteins, including the procoagulant factors V and VIII. Tranexamic acid also directly inhibits plasmin activity, but higher doses are required than are needed to reduce plasmin formation.
DL-2-Aminooctanoic acid, also known as a-aminocaprylate or alpha-aminocaprylic acid, belongs to the class of organic compounds known as alpha amino acids. These are amino acids in which the amino group is attached to the carbon atom immediately adjacent to the carboxylate group (alpha carbon). DL-2-Aminooctanoic acid is a very hydrophobic molecule, practically insoluble in water, and relatively neutral. Outside of the human body, DL-2-Aminooctanoic acid has been detected, but not quantified in cow milk.
L-2-Amino-3-(oxalylamino)propanoic acid is found in grass pea. L-2-Amino-3-(oxalylamino)propanoic acid is isolated from Panax notoginseng (sanchi
Histidylproline diketopiperazine is a cyclic dipeptide initially described in both the hypothalamus and cerebral tissues, has been detected in various sites outside the central nervous system, including the gastrointestinal tract and, more specifically, the endocrine pancreas. Histidylproline diketopiperazine belongs to the family of Dioxopiperazines. These are compounds containing a piperazine ring bearing two ketone groups.
1,1-Dimethoxy-2-phenylethane is a flavouring ingredien
Iprodione is an Agricultural and horticultural fungicid
It is used in food as a pH control agent, nutrient supplement, dough conditioner, and texturising, firming and anticaking agent. Calcium oxide is found in many foods, some of which are calabash, common hazelnut, cottonseed, and coconut.
1(10),4-Cadinadiene is a cadinene (FDB009046) of the delta-serie [FooDB].
Fenitrothion (IUPAC name: O,O-Dimethyl O-(3-methyl-4-nitrophenyl) phosphorothioate) is a phosphorothioate (organophosphate) insecticide; cheap and widely used worldwide.
4-Hydroxyestrone is metabolite originating from 17beta-estradiol, and is reported as carcinogenic and have ability to initiate cancer.
Alpha-Terpinene is one of four isomers of terpinene (the other three being beta terpinene, gamma terpenine, and delta terpinine or terpimolene) that differ in the position of carbon-carbon double bonds. Alpha-Terpinene belongs to the class of organic compounds known as menthane monoterpenes. These are monoterpenes with a structure based on the o-, m-, or p-menthane backbone. p-Menthane consists of the cyclohexane ring with a methyl group and a (2-methyl)-propyl group at the 1 and 4 ring position, respectively. The o- and m- menthanes are much rarer, and presumably arise by alkyl migration of p-menthanes. alpha-Terpinene is a naturally occurring monoterpene found in allspice, cardamom, and marjoram. alpha-Terpinene is a constituent of many essential oils with oil from Litsea ceylanica being is a major source (20%) of it. alpha-Terpinene has been found in Citrus, Eucalyptus and Juniperus species, and cannabis plants (PMID:6991645 ). ±-Terpinene is a flavouring agent and is produced industrially by acid-catalyzed rearrangement of ±-pinene. It has perfume and flavoring properties but is mainly used to confer a pleasant odor to industrial fluids.
2-Hydroxynicotinic acid, also known as 2-hydroxypyridine-3-carboxylic acid, is a member of the class of compounds known as pyridinecarboxylic acids. Pyridinecarboxylic acids are compounds containing a pyridine ring bearing a carboxylic acid group. 2-Hydroxynicotinic acid is soluble (in water) and a weakly acidic compound (based on its pKa). 2-Hydroxynicotinic acid can be found in urine. 2-Hydroxynicotinic acid is a white to light yellow powder soluble in water. Its melting point is 258-261°C.
25,26-(OH)2D3 is a renal microsomal 25-OH-D3 metabolite, whose plasma concentration increases during vitamin D excess concomitantly with an increase in the concentration of lactone. This observation considered with the related structural features of 25,26-(OH)2D3 and lactone (both are oxidized at (C-26) suggested that 25,26(OH)2D3, a metabolite of unknown function, could be a precursor to lactone. In fact, it has been reported that functionalization of C-26 and subsequent lactone formation occurs exclusively in kidney. However, rigorous examination has unambiguously excluded 25S,26-(OH)2D3, the naturally occurring form as a significant lactone precursor. (PMID: 6286629).
Dimethyl peroxide is found in green vegetables. Dimethyl peroxide is a constituent of Basella rubra (Malabar spinach)
5-Methylcytidine belongs to the class of organic compounds known as pyrimidine nucleosides. Pyrimidine nucleosides are compounds comprising a pyrimidine base attached to a ribosyl or deoxyribosyl moiety.
Nicotinamide adenine dinucleotide phosphate (NADP) is a coenzyme composed of ribosylnicotinamide 5'-phosphate (NMN) coupled with a pyrophosphate linkage to 5'-phosphate adenosine 2',5'-bisphosphate. NADP serves as an electron carrier in a number of reactions, being alternately oxidized (NADP+) and reduced (NADPH). NADP is formed through the addition of a phosphate group to the 2' position of the adenosyl nucleotide through an ester linkage (Dorland, 27th ed). This extra phosphate is added by the enzyme NAD+ kinase and removed via NADP+ phosphatase. NADP is also known as TPN (triphosphopyridine nucleotide) and it is an important cofactor used in anabolic reactions in all forms of cellular life. Examples include the Calvin cycle, cholesterol synthesis, fatty acid elongation, and nucleic acid synthesis (Wikipedia).
Isoeugenyl benzyl ether is used as a food additive [EAFUS] ("EAFUS: Everything Added to Food in the United States. [http://www.eafus.com/]")
Dibenzyl ether, also known as benzyl oxide or fema 2371, belongs to the class of organic compounds known as benzylethers. These are aromatic ethers with the general formula ROCR' (R = alkyl, aryl; R'=benzene). Dibenzyl ether is a sweet, almond, and cherry tasting compound. Dibenzyl ether has been detected, but not quantified, in dills. This could make dibenzyl ether a potential biomarker for the consumption of these foods.
Dietary supplement
This compound belongs to the family of Butyrophenones. These are compounds containing 1-phenylbutan-1-one moiety.
Carvone is found in anise. Carvone is a flavouring ingredient
N-Acetyllactosamine, also known as galb1-4glcnacb or lacnac, belongs to the class of organic compounds known as acylaminosugars. These are organic compounds containing a sugar linked to a chain through N-acyl group. N-Acetyllactosamine exists in all living organisms, ranging from bacteria to humans.
Tiropramide (INN) is an antispasmodic.
Pandamarilactone 31 is a food flavouring. Pandamarilactone 31 is an alkaloid from leaves of Pandanus amaryllifolius.
Aspartyl-Cysteine is a dipeptide composed of aspartate and cysteine. It is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis. This dipeptide has not yet been identified in human tissues or biofluids and so it is classified as an 'Expected' metabolite.
Ascorbic acid is found naturally in citrus fruits and many vegetables and is an essential nutrient in human diets. It is necessary to maintain connective tissue and bone. The biologically active form of ascorbic acid is vitamin C. Vitamin C is a water soluble vitamin. Primates (including humans) and a few other species in all divisions of the animal kingdom, notably the guinea pig, have lost the ability to synthesize ascorbic acid and must obtain it in their food. Vitamin C functions as a reducing agent and coenzyme in several metabolic pathways. Vitamin C is considered an antioxidant (PubChem). Ascorbic acid is an electron donor for enzymes involved in collagen hydroxylation, biosynthesis of carnitine and norepinephrine, tyrosine metabolism, and amidation of peptide hormones. Ascrobic acid (vitamin C) deficiency causes scurvy. The amount of vitamin C necessary to prevent scurvy may not be adequate to maintain optimal health. The ability of vitamin C to donate electrons also makes it a potent water-soluble antioxidant that readily scavenges free radicals such as molecular oxygen, superoxide, hydroxyl radical, and hypochlorous acid. In this setting, several mechanisms could account for a link between vitamin C and heart disease. One is the relation between LDL oxidation and vitamins C and E. Vitamin C in vitro can recycle vitamin E, which can donate electrons to prevent LDL oxidation in vitro. As the lipid-phase vitamin E is oxidized, it can be regenerated by aqueous vitamin C. Other possibilities are that vitamin C could decrease cholesterol by mechanisms not well characterized, or could improve vasodilatation and vascular reactivity, perhaps by decreasing the interactions of nitric oxide with oxidants (PMID: 10799361). Moreover, ascorbic acid is found to be associated with hyperoxalemia, which is an inborn error of metabolism. Ascorbic acid is also a microbial metabolite produced by Ketogulonicigenium (PMID: 15785002).
Cortexolone, also known as cortodoxone or 11-deoxycortisol, belongs to the class of organic compounds known as 21-hydroxysteroids. These are steroids carrying a hydroxyl group at the 21-position of the steroid backbone. Thus, cortexolone is considered to be a steroid molecule. Cortexolone is an endogenous glucocorticoid steroid hormone, and a metabolic intermediate in the synthesis of cortisol. It was first described by Tadeusz Reichstein in 1938 and named as Substance S. It has also been referred to as Reichstein's Substance S or Compound S. Cortexolone acts as a glucocorticoid, though it is less potent than cortisol. Cortexolone is synthesized from 17Œ±-hydroxyprogesterone by 21-hydroxylase and is converted to cortisol by 11Œ≤-hydroxylase. As a result, the level of cortexolone is often measured in patients to diagnose impaired cortisol synthesis, to identify any enzyme deficiency that may be causing impairment along the pathway to cortisol, and to differentiate adrenal disorders. Cortexolone in mammals has limited biological activity and mainly acts as metabolic intermediate within the glucocorticoid pathway, leading to cortisol. On the other hand, in sea lampreys, cortexolone is the major glucocorticoid, with mineralocorticoid activity. Cortexolone in sea lampreys binds to specific corticosteroid receptors and is involved in intestinal osmoregulation and in sea lamprey at metamorphosis, a process in which they develop seawater tolerance before downstream migration.
N-nitrosomethanamine is classified as a member of the Alkyldiazohydroxides. Alkyldiazohydroxides are organonitrogen compounds with the general formula RN=NOH, where R = organyl. N-nitrosomethanamine is considered to be soluble (in water) and acidic
Uridine diphosphate glucose, also known as UDP-glucose or UDP-alpha-D-glucose, belongs to the class of organic compounds known as pyrimidine nucleotide sugars. These are pyrimidine nucleotides bound to a saccharide derivative through the terminal phosphate group. Uridine diphosphate glucose exists in all living species, ranging from bacteria to plants to humans. Uridine diphosphate glucose is a key intermediate in carbohydrate metabolism. For instance, UDP-glucose is a precursor of glycogen and can be converted into UDP-galactose and UDP-glucuronic acid, which can then be used as substrates by the enzymes that make polysaccharides containing galactose and glucuronic acid. UDP-glucose can also be used as a precursor for the biosynthesis of sucrose, lipopolysaccharides and glycosphingolipids. Within humans, uridine diphosphate glucose participates in a number of enzymatic reactions. In particular, ceramide (D18:1/18:0) and uridine diphosphate glucose can be converted into glucosylceramide (D18:1/18:0) and uridine 5'-diphosphate through the action of the enzyme ceramide glucosyltransferase. In addition, glucosylceramide (D18:1/18:0) and uridine diphosphate glucose can be biosynthesized from lactosylceramide (D18:1/18:0) and uridine 5'-diphosphate through its interaction with the enzyme Beta-1,4-galactosyltransferase 6.
Carbon dioxide is a colorless, odorless gas that can be formed by the body and is necessary for the respiration cycle of plants and animals. Carbon dioxide is produced during respiration by all animals, fungi and microorganisms that depend on living and decaying plants for food, either directly or indirectly. It is, therefore, a major component of the carbon cycle. Additionally, carbon dioxide is used by plants during photosynthesis to make sugars which may either be consumed again in respiration or used as the raw material to produce polysaccharides such as starch and cellulose, proteins and the wide variety of other organic compounds required for plant growth and development. When inhaled at concentrations much higher than usual atmospheric levels, it can produce a sour taste in the mouth and a stinging sensation in the nose and throat. These effects result from the gas dissolving in the mucous membranes and saliva, forming a weak solution of carbonic acid. Carbon dioxide is used by the food industry, the oil industry, and the chemical industry. Carbon dioxide is used to produce carbonated soft drinks and soda water. Traditionally, the carbonation in beer and sparkling wine comes about through natural fermentation, but some manufacturers carbonate these drinks artificially.
3'-Phosphoadenosine-5'-phosphosulfate. Key intermediate in the formation by living cells of sulfate esters of phenols, alcohols, steroids, sulfated polysaccharides, and simple esters, such as choline sulfate. It is formed from sulfate ion and ATP in a two-step process. This compound also is an important step in the process of sulfur fixation in plants and microorganisms.
Oxalacetic acid, also known as oxaloacetic acid, keto-oxaloacetate or 2-oxobutanedioate, belongs to the class of organic compounds known as short-chain keto acids and derivatives. These are keto acids with an alkyl chain the contains less than 6 carbon atoms. Oxalacetic acid is a metabolic intermediate in many processes that occur in animals and plants. It takes part in gluconeogenesis, the urea cycle, the glyoxylate cycle, amino acid synthesis, fatty acid synthesis and the citric acid cycle. Oxalacetic acid exists in all living species, ranging from bacteria to plants to humans. Within humans, oxalacetic acid participates in a number of enzymatic reactions. In particular, oxalacetic acid is an intermediate of the citric acid cycle, where it reacts with acetyl-CoA to form citrate, catalyzed by citrate synthase. It is also involved in gluconeogenesis and the urea cycle. In gluconeogenesis oxaloacetate is decarboxylated and phosphorylated by phosphoenolpyruvate carboxykinase and becomes 2-phosphoenolpyruvate using guanosine triphosphate (GTP) as phosphate source. In the urea cycle, malate is acted on by malate dehydrogenase to become oxaloacetate, producing a molecule of NADH. After that, oxaloacetate can be recycled to aspartate, as this recycling maintains the flow of nitrogen into the cell. In mice, injections of oxalacetic acid have been shown to promote brain mitochondrial biogenesis, activate the insulin signaling pathway, reduce neuroinflammation and activate hippocampal neurogenesis (PMID: 25027327). Oxalacetic acid has also been reported to reduce hyperglycemia in type II diabetes and to extend longevity in C. elegans (PMID: 25027327). Outside of the human body, oxalacetic acid has been detected, but not quantified in, several different foods, such as Persian limes, lemon balms, wild rice, canola, and peanuts. This could make oxalacetic acid a potential biomarker for the consumption of these foods.
Flavin adenine dinucleotide (FAD) is a redox-active coenzyme associated with various proteins, which is involved with several enzymatic reactions in metabolism. FAD, also known as adeflavin or flamitajin b, belongs to the class of organic compounds known as flavin nucleotides. These are nucleotides containing a flavin moiety. Flavin is a compound that contains the tricyclic isoalloxazine ring system, which bears 2 oxo groups at the 2- and 4-positions. FAD is a drug which is used to treat eye diseases caused by vitamin b2 deficiency, such as keratitis and blepharitis. FAD exists in all living species, ranging from bacteria to humans. In humans, FAD is involved in the metabolic disorder called the medium chain acyl-coa dehydrogenase deficiency (mcad) pathway. Outside of the human body, FAD has been detected, but not quantified in several different foods, such as other bread, passion fruits, asparagus, kelps, and green bell peppers. It is a flavoprotein in which the substituent at position 10 of the flavin nucleus is a 5'-adenosyldiphosphoribityl group.
D-Ribose 5-phosphate (CAS: 4300-28-1), also known as R-5-P, belongs to the class of organic compounds known as pentose phosphates. These are carbohydrate derivatives containing a pentose substituted by one or more phosphate groups. D-Ribose 5-phosphate exists in all living species, ranging from bacteria to humans. Within humans, D-ribose 5-phosphate participates in a number of enzymatic reactions. In particular, D-ribose 5-phosphate can be biosynthesized from D-ribulose 5-phosphate; which is mediated by the enzyme ribose-5-phosphate isomerase. In addition, D-ribose 5-phosphate can be biosynthesized from D-ribose; which is catalyzed by the enzyme ribokinase. Outside of the human body, D-ribose 5-phosphate has been detected, but not quantified in cow milk and rices. D-Ribose 5-phosphate is both a product and an intermediate of the pentose phosphate pathway. The last step of the oxidative reactions in the pentose phosphate pathway is the production of ribulose 5-phosphate. D-Ribose 5-phosphate is an important intermediate metabolite in the pentose phosphate pathway and in the purine metabolism pathway. The intracellular ribose 5-phosphate concentration is an important determinant of the rate of de novo purine synthesis (PMID:6699001).
Glucose 1-phosphate (also called cori ester) is a glucose molecule with a phosphate group on the 1'-carbon. It can exist in either the α- or β-anomeric form. Glucose 1-phosphate belongs to the class of organic compounds known as monosaccharide phosphates. These are monosaccharides comprising a phosphated group linked to the carbohydrate unit. Glucose 1-phosphate is the direct product of the reaction in which glycogen phosphorylase cleaves off a molecule of glucose from a greater glycogen structure. It cannot travel down many metabolic pathways and must be interconverted by the enzyme phosphoglucomutase in order to become glucose 6-phosphate. Free glucose 1-phosphate can also react with UTP to form UDP-glucose. It can then return to the greater glycogen structure via glycogen synthase.
Palmityl-CoA is a fatty acid coenzyme derivative which plays a key role in fatty acid oxidation and biosynthesis.
Cytidine monophosphate, also known as 5'-cytidylic acid and abbreviated CMP, is a nucleotide. It is an ester of phosphoric acid with the nucleoside cytidine. CMP consists of the phosphate group, the pentose sugar ribose, and the nucleobase cytosine. Cytidine monophosphate (CMP) is derived from cytidine triphosphate (CTP) with subsequent loss of two phosphates. The synthesis of the pyrimidines CTP and UTP occurs in the cytoplasm and starts with the formation of carbamoyl phosphate from glutamine and CO2. Next, aspartate undergoes a condensation reaction with carbamoyl-phosphate to form orotic acid. In a subsequent cyclization reaction, the enzyme Aspartate carbamoyltransferase forms N-carbamoyl-aspartate which is converted into dihydroorotic acid by Dihydroorotase. The latter is converted to orotate by Dihydroorotate oxidase. Orotate is covalently linked with a phosphorylated ribosyl unit with Orotate phosphoribosyltransferase (aka "PRPP transferase") catalyzing reaction, yielding orotidine monophosphate (OMP). Orotidine-5-phosphate is decarboxylated by Orotidine-5'-phosphate decarboxylase to form uridine monophosphate (UMP). UMP is phosphorylated by two kinases to uridine triphosphate (UTP) via two sequential reactions with ATP. CTP is subsequently formed by amination of UTP by the catalytic activity of CTP synthetase. Cytosine monophosphate (CMP) and uridine monophosphate (UMP) have been prescribed for the treatment of neuromuscular affections in humans. Patients treated with CMP/UMP recover from altered neurological functions. Additionally, the administration of CMP/UMP appears to favour the entry of glucose in the muscle and CMP/UMP may be important in maintaining the level of hepatic glycogen constant during exercise. [PMID:18663991].
Pyridoxal phosphate, also known as PLP, pyridoxal 5'-phosphate or P5P, is the active form of vitamin B6. It is a coenzyme in a variety of enzymatic reactions. Pyridoxal 5'-phosphate belongs to the class of organic compounds known as pyridoxals and derivatives. Pyridoxals and derivatives are compounds containing a pyridoxal moiety, which consists of a pyridine ring substituted at positions 2,3,4, and 5 by a methyl group, a hydroxyl group, a carbaldehyde group, and a hydroxymethyl group, respectively. Pyridoxal 5'-phosphate is a drug which is used for nutritional supplementation and for treating dietary shortage or imbalance. Pyridoxal 5'-phosphate exists in all living species, ranging from bacteria to humans. In humans, pyridoxal 5'-phosphate is involved in glycine and serine metabolism. Outside of the human body, pyridoxal 5'-phosphate is found, on average, in the highest concentration within cow milk. Pyridoxal 5'-phosphate has also been detected, but not quantified in several different foods, such as soursops, italian sweet red peppers, muscadine grapes, european plums, and blackcurrants. Pyridoxal 5'-phosphate, with regard to humans, has been found to be associated with several diseases such as epilepsy, early-onset, vitamin B6-dependent, odontohypophosphatasia, pyridoxamine 5-prime-phosphate oxidase deficiency, and hypophosphatasia. Pyridoxal 5'-phosphate has also been linked to the inborn metabolic disorder celiac disease.
Phenylacetyl-CoA was found to be a very potent inhibitor of choline acetyltransferase, competitive for acetyl-CoA with Ki of 3.1 X 10(-7)M. Phenylacetate exerts its neurotoxic action through its metabolic product, phenylacetyl-CoA, which could severely decrease the availability of acetyl-CoA (PMID: 6142928).
Phenylacetylglycine is an acyl glycine. Acyl glycines are normally minor metabolites of fatty acids. However, the excretion of certain acyl glycines is increased in several inborn errors of metabolism. In certain cases the measurement of these metabolites in body fluids can be used to diagnose disorders associated with mitochondrial fatty acid beta-oxidation. Acyl glycines are produced through the action of glycine N-acyltransferase (EC 2.3.1.13) which is an enzyme that catalyzes the chemical reaction:. acyl-CoA + glycine < -- > CoA + N-acylglycine. Phenylacetylglycine or PAG is a glycine conjugate of phenylacetic acid. Phenylacetic acid may arise from exposure to styrene (plastic) or through the consumption of fruits and vegetables. Phenylacetic acid is used in some perfumes, possessing a honey-like odour in low concentrations, and is also used in penicillin G production. PAG is a putative biomarker of phospholipidosis. Urinary PAG is elevated in animals exhibiting abnormal phospholipid accumulation in many tissues and may thus be useful as a surrogate biomarker for phospholipidosis. (PMID: 15764292) The presence of phenylacetylglycine in urine has been confirmed for dogs, rats and mice. However, the presence of this compound in human urine is controversial. GC-MS studies have not found this compound (PMID: 7492634) while NMR studies claimed to have identified it (PMID: 21167146). It appears that phenylacetylglycine may sometimes be mistaken for phenylacetylglutamine via NMR.
Dihydroneopterin phosphate is involved in the folate biosynthesis pathway. Dihydroneopterin phosphate is produced from 2-Amino-4-hydroxy-6-(erythro-1,2,3-trihydroxypropyl)dihydropteridine. triphosphate by [E3.6.1.-]. Dihydroneopterin phosphate is then converted to Dihydroneopterin by [E3.6.1.-].
The biosynthesis of tetrahydrobiopterin (BH4) from dihydroneopterin triphosphate (NH2P3) was studied in human liver extract. The phosphate-eliminating enzyme (PEE) was purified approximately 750-fold. The conversion of NH2P3 to BH4 was catalyzed by this enzyme in the presence of partially purified sepiapterin reductase, Mg2+, and NADPH. The PEE is heat stable when heated at 80°C for 5 min. It has a molecular weight of 63 000 daltons. One possible intermediate 6-(1'-hydroxy-2'-oxopropyl)5,6,7,8-tetrahydropterin(2'-oxo-tetrahydropte rin) was formed upon incubation of BH4 in the presence of sepiapterin reductase and NADP+ at pH 9.0. The reduction of this compound with NaBD4 yielded monodeutero-, threo-, and erythro-BH4; the deuterium was incorporated at the 2' position. This and the UV spectra were consistent with a 2'-oxo-tetrahydropterin structure. Dihydrofolate reductase (DHFR) catalyzed the reduction of BH2 into BH4 and was found to be specific for the pro-R-NADPH side. The sepiapterin reductase catalyzed the transfer of the pro-S hydrogen of NADPH during the reduction of sepiapterin into BH2. In the presence of crude liver extracts, the conversion of NH2P3 into BH4 requires NADPH. Two deuterium atoms were incorporated from (4S-2H)NADHP in the 1' and 2' position of the BH4 side chain. The incorporation of one hydrogen from the solvent was found at position C(6). These results are consistent with the occurrence of an intramolecular redox exchange between the pteridine nucleus and the side chain and formation of 6-pyruvoyl-5,6,7,8-tetrahydropterin(tetrahydro-1'-2'-dioxopterin) as an intermediate (PMID: 3930838).
Uridine 5'-monophosphate (UMP), also known as uridylic acid or uridylate, belongs to the class of organic compounds known as pyrimidine ribonucleoside monophosphates. These are pyrimidine ribobucleotides with monophosphate group linked to the ribose moiety. UMP consists of a phosphate group, a pentose sugar ribose, and the nucleobase uracil; hence, it is a ribonucleotide monophosphate. Uridine 5'-monophosphate exists in all living species, ranging from bacteria to plants to humans. UMP is a nucleotide that is primarily used as a monomer in RNA biosynthesis. Uridine monophosphate is formed from Orotidine 5'-monophosphate (orotidylic acid) in a decarboxylation reaction catalyzed by the enzyme orotidylate decarboxylase. Within humans, uridine 5'-monophosphate participates in a number of enzymatic reactions. In particular, uridine 5'-monophosphate can be converted into uridine 5'-diphosphate through the action of the enzyme UMP-CMP kinase. In addition, uridine 5'-monophosphate can be biosynthesized from uridine 5'-diphosphate through its interaction with the enzyme soluble calcium-activated nucleotidase 1. In brain research studies, uridine monophosphate has been used as a convenient delivery compound for uridine.  Uridine is present in many foods, mainly in the form of RNA. Non-phosphorylated uridine is not bioavailable beyond first-pass metabolism. In a study, gerbils fed a combination of uridine monophosphate, choline, and docosahexaenoic acid (DHA) were found to have significantly improved performance in running mazes over those not fed the supplements, implying an increase in cognitive function (PMID: 18606862).
Thiamine monophosphate, also known as thiamin phosphoric acid or TMP, belongs to the class of organic compounds known as thiamine phosphates. These are thiamine derivatives in which the hydroxyl group of the ethanol moiety is substituted by a phosphate group. Thiamine monophosphate is a very strong basic compound (based on its pKa). Thiamine monophosphate is one of the five known natural thiamine phosphate derivatives. Thiamine (vitamin B1) is the transport form of the vitamin while the phosphorylated derivatives are the active forms.
Glyceric acid is a colourless syrupy acid, obtained from oxidation of glycerol. It is a compound that is secreted excessively in the urine by patients suffering from D-glyceric aciduria, an inborn error of metabolism, and D-glycerate anemia. Deficiency of human glycerate kinase leads to D-glycerate acidemia/D-glyceric aciduria. Symptoms of the disease include progressive neurological impairment, hypotonia, seizures, failure to thrive, and metabolic acidosis. At sufficiently high levels, glyceric acid can act as an acidogen and a metabotoxin. An acidogen is an acidic compound that induces acidosis, which has multiple adverse effects on many organ systems. A metabotoxin is an endogenously produced metabolite that causes adverse health effects at chronically high levels. Glyceric acid is an organic acid. Abnormally high levels of organic acids in the blood (organic acidemia), urine (organic aciduria), the brain, and other tissues lead to general metabolic acidosis. Acidosis typically occurs when arterial pH falls below 7.35. In infants with acidosis, the initial symptoms include poor feeding, vomiting, loss of appetite, weak muscle tone (hypotonia), and lack of energy (lethargy). These can progress to heart abnormalities, seizures, coma, and possibly death. These are also the characteristic symptoms of untreated glyceric aciduria. Many affected children with organic acidemias experience intellectual disability or delayed development. In adults, acidosis or acidemia is characterized by headaches, confusion, feeling tired, tremors, sleepiness, and seizures. Elevated values may also be due to microbial sources such as yeast (Aspergillus, Penicillium, probably Candida) or due to dietary sources containing glycerol (glycerine). Glyceric acid is isolated from various plants (e.g. brassicas, pulses, and Vicia faba).
4-Hydroxyproline (hydroxyproline or Hyp) is a major component of the protein collagen. Hydroxyproline is produced by hydroxylation of the amino acid proline and is, therefore, a post-translationally modified, non-essential amino acid. Hydroxyproline and proline play key roles in collagen stability. In particular, they permit the sharp twisting of the collagen helix. Hydroxyproline is found in few proteins other than collagen. The only other mammalian protein which includes hydroxyproline is elastin. For this reason, hydroxyproline content has been used as an indicator to determine collagen and/or gelatin amount in tissue or biological samples. Increased serum and urine levels of hydroxyproline have been found in Paget's disease (PMID: 436278). Hydroxyproline (Hyp) content in biological fluids is used as a parameter of collagen catabolism, especially bone resorption or tissue degradation. Bedridden and elderly individuals show significantly elevated serum levels of hydroxyproline in comparison to normal, active individuals (PMID: 10706420). Elevated levels of urinary hydroxyproline are also indicative of muscle damage (PMID: 21988268). Increased reactive oxygen species (ROS) are also known to accelerate collagen degradation. Hydroxyproline levels increase in cases of depression and stress (PMID: 21483218). 4-Hydroxyproline is found to be associated with Alzheimer's disease, and also hydroxyprolinemia and iminoglycinuria which are both inborn errors of metabolism. 4-Hydroxyproline is also involved in metabolic disorders such as hyperprolinemia type I, hyperornithinemia with gyrate atrophy (HOGA), L-arginine:glycine amidinotransferase deficiency, creatine deficiency, and guanidinoacetate methyltransferase deficiency. A deficiency in ascorbic acid can result in impaired hydroxyproline formation (PubChem). trans-4-Hydroxy-L-proline is a biomarker for the consumption of processed meat.
Threonic acid, also known as threonate, belongs to the class of organic compounds known as sugar acids and derivatives. Sugar acids and derivatives are compounds containing a saccharide unit which bears a carboxylic acid group. Threonic acid is a sugar acid derived from threose. The L-isomer is a metabolite of ascorbic acid (vitamin C). One study suggested that because L-threonate inhibits DKK1 expression in vitro, it may have potential in the treatment of androgenic alopecia (PMID:21034532). Threonic acid is probably derived from glycated proteins or from degradation of ascorbic acid. It is a normal component in aqueous humour and blood (PMID:10420182). Threonic acid is a substrate of L-threonate 3-dehydrogenase (EC 1.1.1.129) in the ascorbate and aldarate metabolism pathway (KEGG). It has been found to be a microbial metabolite (PMID:20615997).
p-Hydroxyphenylacetic acid, also known as 4-hydroxybenzeneacetate, is classified as a member of the 1-hydroxy-2-unsubstituted benzenoids. 1-Hydroxy-2-unsubstituted benzenoids are phenols that are unsubstituted at the 2-position. p-Hydroxyphenylacetic acid is considered to be slightly soluble (in water) and acidic.  p-Hydroxyphenylacetic acid can be synthesized from acetic acid. It is also a parent compound for other transformation products, including but not limited to, methyl 2-(4-hydroxyphenyl)acetate, ixerochinolide, and lactucopicrin 15-oxalate.  p-Hydroxyphenylacetic acid can be found in numerous foods such as olives, cocoa beans, oats, and mushrooms. p-Hydroxyphenylacetic acid can be found throughout all human tissues and in all biofluids. Within a cell, p-hydroxyphenylacetic acid is primarily located in the cytoplasm and in the extracellular space. p-Hydroxyphenylacetic acid is also a microbial metabolite produced by Acinetobacter, Clostridium, Klebsiella, Pseudomonas, and Proteus. Higher levels of this metabolite are associated with an overgrowth of small intestinal bacteria from Clostridia species including C. difficile, C. stricklandii, C. lituseburense, C. subterminale, C. putrefaciens, and C. propionicum (PMID: 476929, 12173102). p-Hydroxyphenylacetic acid is detected after the consumption of whole grain.
trans-Aconitic acid, also known as trans-aconitate or (e)-aconitic acid, belongs to the class of organic compounds known as tricarboxylic acids and derivatives. These are carboxylic acids containing exactly three carboxyl groups. trans-Aconitic acid exists in all living species, ranging from bacteria to humans. trans-Aconitic acid is a dry, musty, and nut tasting compound. Outside of the human body, trans-aconitic acid has been detected, but not quantified in several different foods, such as garden tomato fruits, root vegetables, soy beans, and rices. trans-Aconitic acid is normally present in human urine, and it has been suggested that is present in larger amounts with Reye's syndrome and organic aciduria. trans-Aconitic acid in the urine is a biomarker for the consumption of soy products. trans-Aconitic acid is a substrate of enzyme trans-Aconitic acid 2-methyltransferase (EC2.1.1.144).
Azelaic acid (AZA) is a naturally occurring saturated nine-carbon dicarboxylic acid (COOH (CH2)7-COOH). It possesses a variety of biological actions both in vitro and in vivo. Interest in the biological activity of AZA arose originally out of studies of skin surface lipids and the pathogenesis of hypochromia in pityriasis versicolor infection. Later, it was shown that Pityrosporum can oxidize unsaturated fatty acids to C8-C12 dicarboxylic acids that are cornpetitive inhibitors of tyrosinase in vitro. Azelaic acid was chosen for further investigation and development of a new topical drug for treating hyperpigmentary disorders for the following reasons: it possesses a middle-range of antityrosinase activity, is inexpensive, and more soluble to be incorporated into a base cream than other dicarboxylic acids. Azelaic acid is another option for the topical treatment of mild to moderate inflammatory acne vulgaris. It offers effectiveness similar to that of other agents without the systemic side effects of oral antibiotics or the allergic sensitization of topical benzoyl peroxide and with less irritation than tretinoin. Azelaic acid is less expensive than certain other prescription acne preparations, but it is much more expensive than nonprescription benzoyl peroxide preparations. Whether it is safe and effective when used in combination with other agents is not known. (PMID: 7737781, 8961845).
Palmitic acid, or hexadecanoic acid, is one of the most common saturated fatty acids found in animals, plants, and microorganisms. As its name indicates, it is a major component of the oil from the fruit of oil palms (palm oil). Excess carbohydrates in the body are converted to palmitic acid. Palmitic acid is the first fatty acid produced during fatty acid synthesis and is the precursor to longer fatty acids. As a consequence, palmitic acid is a major body component of animals. In humans, one analysis found it to make up 21–30% (molar) of human depot fat (PMID: 13756126), and it is a major, but highly variable, lipid component of human breast milk (PMID: 352132). Palmitic acid is used to produce soaps, cosmetics, and industrial mould release agents. These applications use sodium palmitate, which is commonly obtained by saponification of palm oil. To this end, palm oil, rendered from palm tree (species Elaeis guineensis), is treated with sodium hydroxide (in the form of caustic soda or lye), which causes hydrolysis of the ester groups, yielding glycerol and sodium palmitate. Aluminium salts of palmitic acid and naphthenic acid were combined during World War II to produce napalm. The word "napalm" is derived from the words naphthenic acid and palmitic acid (Wikipedia). Palmitic acid is also used in the determination of water hardness and is a surfactant of Levovist, an intravenous ultrasonic contrast agent.
Linoleic acid is a doubly unsaturated fatty acid, also known as an omega-6 fatty acid, occurring widely in plant glycosides. In this particular polyunsaturated fatty acid (PUFA), the first double bond is located between the sixth and seventh carbon atom from the methyl end of the fatty acid (n-6). Linoleic acid is an essential fatty acid in human nutrition because it cannot be synthesized by humans. It is used in the biosynthesis of prostaglandins (via arachidonic acid) and cell membranes (From Stedman, 26th ed). Linoleic acid is found to be associated with isovaleric acidemia, which is an inborn error of metabolism.
Oleic acid (or 9Z)-Octadecenoic acid) is an unsaturated C-18 or an omega-9 fatty acid that is the most widely distributed and abundant fatty acid in nature. It occurs naturally in various animal and vegetable fats and oils. It is an odorless, colorless oil, although commercial samples may be yellowish. The name derives from the Latin word oleum, which means oil. Oleic acid is the most abundant fatty acid in human adipose tissue, and the second most abundant in human tissues overall, following palmitic acid. Oleic acid is a component of the normal human diet, being a part of animal fats and vegetable oils. Triglycerides of oleic acid represent the majority of olive oil (about 70%). Oleic acid triglycerides also make up 59‚Äì75% of pecan oil, 61% of canola oil, 36‚Äì67% of peanut oil, 60% of macadamia oil, 20‚Äì80% of sunflower oil, 15‚Äì20% of grape seed oil, sea buckthorn oil, 40% of sesame oil, and 14% of poppyseed oil. High oleic variants of plant sources such as sunflower (~80%) and canola oil (70%) also have been developed. consumption has been associated with decreased low-density lipoprotein (LDL) cholesterol, and possibly with increased high-density lipoprotein (HDL) cholesterol, however, the ability of oleic acid to raise HDL is still debated. Oleic acid may be responsible for the hypotensive (blood pressure reducing) effects of olive oil that is considered a health benefit. Oleic acid is used in manufacturing of surfactants, soaps, plasticizers. It is also used as an emulsifying agent in foods and pharmaceuticals. Oleic acid is used commercially in the preparation of oleates and lotions, and as a pharmaceutical solvent.
Stearic acid, also known as octadecanoic acid or C18:0, belongs to the class of organic compounds known as long-chain fatty acids. These are fatty acids with an aliphatic tail that contains between 13 and 21 carbon atoms. Stearic acid (its ester is called stearate) is a saturated fatty acid that has 18 carbons and is therefore a very hydrophobic molecule that is practically insoluble in water.  It exists as a waxy solid.  In terms of its biosynthesis, stearic acid is produced from carbohydrates via the fatty acid synthesis machinery wherein acetyl-CoA contributes two-carbon building blocks, up to the 16-carbon palmitate, via the enzyme complex fatty acid synthase (FA synthase), at which point a fatty acid elongase is needed to further lengthen it.  After synthesis, there are a variety of reactions it may undergo, including desaturation to oleate via stearoyl-CoA desaturase (PMID: 16477801).  Stearic acid is found in all living organisms ranging from bacteria to plants to animals.  It is one of the useful types of saturated fatty acids that comes from many animal and vegetable fats and oils. For example, it is a component of cocoa butter and shea butter.  It is used as a food additive, in cleaning and personal care products, and in lubricants.  Its name comes from the Greek word stear, which means ‚Äòtallow‚Äô or ‚Äòhard fat‚Äô.
myo-Inositol 1-phosphate, also known as I1P or ins(1)p, belongs to the class of organic compounds known as inositol phosphates. Inositol phosphates are compounds containing a phosphate group attached to an inositol (or cyclohexanehexol) moiety. myo-Inositol 1-phosphate is a metabolite of inositol phosphate metabolism and the phosphatidylinositol signalling system. Inositol phosphatases (EC:3.1.3.25) play a crucial role in the phosphatidylinositol signalling pathway. Expression is substantially higher in the subcortical regions of the brain, most prominently in the caudate. The phosphatidylinositol pathway is thought to be modified by lithium, a commonly prescribed medication in treating bipolar disorder (OMIM: 605922).
Docosahexaenoic acid (DHA) is an omega-3 essential fatty acid. Chemically, DHA is a carboxylic acid with a 22-carbon chain and six cis- double bonds with the first double bond located at the third carbon from the omega end. DHA is most often found in fish oil. It is a major fatty acid in sperm and brain phospholipids, especially in the retina. Dietary DHA can reduce the level of blood triglycerides in humans, which may reduce the risk of heart disease (Wikipedia). Docosahexaenoic acid is found to be associated with isovaleric acidemia, which is an inborn error of metabolism.
Sucrose is a nonreducing disaccharide composed of glucose and fructose linked via their anomeric carbons. It is obtained commercially from sugarcane (Saccharum officinarum), sugar beet (Beta vulgaris), and other plants and used extensively as a food and a sweetener. Sucrose is derived by crushing and extracting sugarcane with water or by extracting sugar beet with water, evaporating, and purifying with lime, carbon, and various liquids. Sucrose is also obtainable from sorghum. Sucrose occurs in low percentages in honey and maple syrup. Sucrose is used as a sweetener in foods and soft drinks, in the manufacture of syrups, in invert sugar, confectionery, preserves and jams, demulcent, pharmaceutical products, and caramel. Sucrose is also a chemical intermediate for detergents, emulsifying agents, and other sucrose derivatives. Sucrose is widespread in the seeds, leaves, fruits, flowers, and roots of plants, where it functions as an energy store for metabolism and as a carbon source for biosynthesis. The annual world production of sucrose is in excess of 90 million tons mainly from the juice of sugar cane (20%) and sugar beet (17%). In addition to its use as a sweetener, sucrose is used in food products as a preservative, antioxidant, moisture control agent, stabilizer, and thickening agent. BioTransformer predicts that sucrose is a product of 6-O-sinapoyl sucrose metabolism via a hydrolysis-of-carboxylic-acid-ester-pattern1 reaction occurring in human gut microbiota and catalyzed by the liver carboxylesterase 1 (P23141) enzyme (PMID: 30612223).
gamma-Tocopherol, also known as 7,8-dimethyltocol, belongs to the class of organic compounds known as tocopherols. These are vitamin E derivatives containing a saturated trimethyltridecyl chain attached to the carbon C6 atom of a benzopyran ring system. They differ from tocotrienols which contain an unsaturated trimethyltrideca-3,7,11-trien-1-yl chain. It is estimated that 50% of gamma-tocopherol is metabolized into gamma-CEHC and excreted into the urine. gamma-Tocopherol is the predominant form of vitamin E in plant seeds and derived products (e.g. nuts and vegetable oils). Unlike alpha-tocopherol, gamma-tocopherol inhibits cyclooxygenase activity and, therefore, exhibit anti-inflammatory properties (PMID: 11722951).
alpha-Tocopherol is traditionally recognized as the most active form of vitamin E in humans and is a powerful biological antioxidant. The measurement of "vitamin E" activity in international units (IU) was based on fertility enhancement by the prevention of spontaneous abortions in pregnant rats relative to alpha-Tocopherol. Natural vitamin E exists in eight different forms or isomers: four tocopherols and four tocotrienols. In foods, the most abundant sources of vitamin E are vegetable oils such as palm oil, sunflower, corn, soybean, and olive oil. Nuts, sunflower seeds, and wheat germ are also good sources.
Campesterol is a phytosterol, meaning it is a steroid derived from plants. As a food additive, phytosterols have cholesterol-lowering properties (reducing cholesterol absorption in intestines), and may act in cancer prevention. Phytosterols naturally occur in small amount in vegetable oils, especially soybean oil. One such phytosterol complex, isolated from vegetable oil, is cholestatin, composed of campesterol, stigmasterol, and brassicasterol, and is marketed as a dietary supplement. Sterols can reduce cholesterol in human subjects by up to 15%. The mechanism behind phytosterols and the lowering of cholesterol occurs as follows : the incorporation of cholesterol into micelles in the gastrointestinal tract is inhibited, decreasing the overall amount of cholesterol absorbed. This may in turn help to control body total cholesterol levels, as well as modify HDL, LDL and TAG levels. Many margarines, butters, breakfast cereals and spreads are now enriched with phytosterols and marketed towards people with high cholesterol and a wish to lower it. -- Wikipedia.
Tetracosatetraenoic acid n-6 is metabolized to radiolabelled monohydroxylated fatty acids (predominantly the 9-hydroxy positional isomer) but not to other lipoxygenase or cyclooxygenase products by the calcium ionophore-stimulated cells. (PMID: 8049246). Oxidation of tetracosatetraenoic acid n-6 is relatively normal in adrenoleukodystrophy cells and in the cells from one PD,peroxisomal disease patient.
beta-Sitosterol, a main dietary phytosterol found in plants, may have the potential for prevention and therapy for human cancer. Phytosterols are plant sterols found in foods such as oils, nuts, and vegetables. Phytosterols, in the same way as cholesterol, contain a double bond and are susceptible to oxidation, and are characterized by anti-carcinogenic and anti-atherogenic properties (PMID:13129445, 11432711). beta-Sitosterol is a phytopharmacological extract containing a mixture of phytosterols, with smaller amounts of other sterols, bonded with glucosides. These phytosterols are commonly derived from the South African star grass, Hypoxis rooperi, or from species of Pinus and Picea. The purported active constituent is termed beta-sitosterol. Additionally, the quantity of beta-sitosterol-beta-D-glucoside is often reported. Although the exact mechanism of action of beta-sitosterols is unknown, it may be related to cholesterol metabolism or anti-inflammatory effects (via interference with prostaglandin metabolism). Compared with placebo, beta-sitosterol improved urinary symptom scores and flow measures (PMID:10368239). A plant food-based diet modifies the serum beta-sitosterol concentration in hyperandrogenic postmenopausal women. This finding indicates that beta-sitosterol can be used as a biomarker of exposure in observational studies or as a compliance indicator in dietary intervention studies of cancer prevention (PMID:14652381). beta-Sitosterol induces apoptosis and activates key caspases in MDA-MB-231 human breast cancer cells (PMID:12579296).
Methyl beta-D-glucopyranoside is found in cereals and cereal products. Methyl beta-D-glucopyranoside is present in Medicago sativa (alfalfa
Hydroxylamine is a reactive chemical with formula NH2OH. It can be considered a hybrid of ammonia and water due to parallels it shares with each. At room temperature pure NH2OH is ordinarily a white, unstable crystalline, hygroscopic compound; however it is almost always encountered as an aqueous solution. A colorless inorganic compound (HONH2) used in organic synthesis and as a reducing agent, due to its ability to donate nitric oxide. Hydroxylamine may explode on heating. It is an irritant to the respiratory tract, skin, eyes, and other mucous membranes. It may be absorbed through the skin, is harmful if swallowed, and is a possible mutagen. NH2OH is an intermediate in the biological nitrification. The oxidation of NH3 is mediated by HAO (hydroxylamine oxidoreductase).
Threonic acid, also known as threonate, belongs to the class of organic compounds known as sugar acids and derivatives. Sugar acids and derivatives are compounds containing a saccharide unit which bears a carboxylic acid group. Threonic acid is a sugar acid derived from threose. The L-isomer is a metabolite of ascorbic acid (vitamin C). One study suggested that because L-threonate inhibits DKK1 expression in vitro, it may have potential in the treatment of androgenic alopecia (PMID:21034532). Threonic acid is probably derived from glycated proteins or from degradation of ascorbic acid. It is a normal component in aqueous humour and blood (PMID:10420182). Threonic acid is a substrate of L-threonate 3-dehydrogenase (EC 1.1.1.129) in the ascorbate and aldarate metabolism pathway (KEGG). It has been found to be a microbial metabolite (PMID:20615997).
3-Aminoisobutanoic acid, also known as b-aminoisobutyrate or 2-methyl-beta-alanine, belongs to the class of organic compounds known as beta amino acids and derivatives. These are amino acids having a (-NH2) group attached to the beta carbon atom. 3-Aminoisobutanoic acid is a very hydrophobic molecule, practically insoluble in water, and relatively neutral. 3-Aminoisobutanoic acid exists in all eukaryotes, ranging from yeast to humans. 3-aminoisobutanoic acid can be biosynthesized from ureidoisobutyric acid; which is mediated by the enzyme Beta-ureidopropionase. In humans, 3-aminoisobutanoic acid is involved in the metabolic disorder called the beta-ureidopropionase deficiency pathway. Beta-ureidopropionase deficiency is an inborn error of pyrimidine degradation associated with neurological abnormalities (OMIM 606673). 3-Aminoisobutanoic acid is a potentially toxic compound.
Adenosine is a nucleoside that is composed of adenine and D-ribose. Adenosine or adenosine derivatives play many important biological roles in addition to being components of DNA and RNA. For instance, adenosine plays an important role in energy transfer as adenosine triphosphate (ATP) and adenosine diphosphate (ADP). It also plays a role in signal transduction as cyclic adenosine monophosphate (cAMP). Adenosine itself is both a neurotransmitter and potent vasodilator. When administered intravenously adenosine causes transient heart block in the AV node. Due to the effects of adenosine on AV node-dependent supraventricular tachycardia, adenosine is considered a class V antiarrhythmic agent. Overdoses of adenosine intake (as a drug) can lead to several side effects including chest pain, feeling faint, shortness of breath, and tingling of the senses. Serious side effects include a worsening dysrhythmia and low blood pressure. When present in sufficiently high levels, adenosine can act as an immunotoxin and a metabotoxin. An immunotoxin disrupts, limits the function, or destroys immune cells. A metabotoxin is an endogenous metabolite that causes adverse health effects at chronically high levels. Chronically high levels of adenosine are associated with adenosine deaminase deficiency. Adenosine is a precursor to deoxyadenosine, which is a precursor to dATP. A buildup of dATP in cells inhibits ribonucleotide reductase and prevents DNA synthesis, so cells are unable to divide. Since developing T cells and B cells are some of the most mitotically active cells, they are unable to divide and propagate to respond to immune challenges. High levels of deoxyadenosine also lead to an increase in S-adenosylhomocysteine, which is toxic to immature lymphocytes.
beta-Tocopherol is an antioxidant which is synthesized by photosynthetic organisms and plays an important role in human and animal nutrition. beta-Tocopherols can be oxidized in dry CH2Cl2 or CH3CN by one electron to form cation radicals that deprotonate to form the neutral phenoxyl radicals, which are then immediately further oxidized by one electron to the phenoxonium cations (an ECE electrochemical mechanism, where E signifies an electron transfer and C represents a chemical step, with the electrochemical mechanism having been determined by in situ spectroscopic analysis). The phenoxonium cation of beta-tocopherol is stable for several minutes (PMID: 16771430). beta-Tocopherol has been identified in the human placenta (PMID: 32033212).
O-Phosphoethanolamine, also known as PEA, phosphorylethanolamine, colamine phosphoric acid or ethanolamine O-phosphate, belongs to the class of organic compounds known as phosphoethanolamines. Phosphoethanolamines are compounds containing a phosphate linked to the second carbon of an ethanolamine. O-Phosphoethanolamine is used in the biosynthesis of two different types of phospholipids: glycerophospholipids and sphingolipids. O-Phosphoethanolamine exists in all living species, ranging from bacteria to plants to humans. Within humans, O-phosphoethanolamine participates in a number of enzymatic reactions. In particular, cytidine triphosphate and O-phosphoethanolamine can be converted into CDP-ethanolamine; which is mediated by the enzyme ethanolamine-phosphate cytidylyltransferase. In addition, O-phosphoethanolamine can be biosynthesized from ethanolamine; which is catalyzed by the enzyme choline/ethanolamine kinase. In humans, O-phosphoethanolamine is involved in phosphatidylcholine biosynthesis. O-phosphoethanolamine is also a product of the metabolism of sphingolipids. In particular, sphinglipids are metabolized in vivo to phosphorylethanolamine and a fatty aldehyde, generally palmitaldehyde. Both metabolites are ultimately converted to glycerophospholipids. The lipids are first phosphorylated by a kinase and then cleaved by the pyridoxal-dependent sphinganine-1-phosphate aldolase. Elevated urine levels of O-Phosphoethanolamine or PEA can be used to help in the diagnosis of Hypophosphatasia (HPP). Reference ranges for urinary PEA vary according to age and somewhat by diet, and follow a circadian rhythm. Outside of the human body, O-phosphoethanolamine has been detected, but not quantified in, several different foods, such as oxheart cabbages, anises, shiitakes, abalones, and teffs.
Ethanolamine (MEA), also known as monoethanolamine, aminoethanol or glycinol, belongs to the class of organic compounds known as 1,2-aminoalcohols (or simply aminoalcohols). These are organic compounds containing an alkyl chain with an amine group bound to the C1 atom and an alcohol group bound to the C2 atom. Ethanolamine is a colorless, viscous liquid with an odor reminiscent of ammonia. In pharmaceutical formulations, ethanolamine is used primarily for buffering or preparation of emulsions. Ethanolamine can also be used as pH regulator in cosmetics. Biologically, ethanolamine is an initial precursor for the biosynthesis of two primary phospholipid classes, phosphatidylcholine (PC) and phosphatidylethanolamine (PE). In this regard, ethanolamine is the second-most-abundant head group for phospholipids. Ethanolamine serves as a precursor for a variety of N-acylethanolamines (NAEs). These are molecules that modulate several animal and plant physiological processes such as seed germination, plant‚Äìpathogen interactions, chloroplast development and flowering (PMID: 30190434). Ethanolamine, when combined with arachidonic acid (C20H32O2; 20:4, œâ-6), can also form the endocannabinoid anandamide. Ethanolamine can be converted to phosphoethanolamine via the enzyme known as ethanolamine kinase. the two substrates of this enzyme are ATP and ethanolamine, whereas its two products are ADP and O-phosphoethanolamine. In most plants ethanolamine is biosynthesized by decarboxylation of serine via a pyridoxal 5'-phosphate-dependent l-serine decarboxylase (SDC). Ethanolamine exists in all living species, ranging from bacteria to plants to humans. Ethanolamine has been detected, but not quantified in, several different foods, such as narrowleaf cattails, mung beans, blackcurrants, white cabbages, and bilberries.
PC(14:1(9Z)/14:0) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(14:1(9Z)/14:0), in particular, consists of one chain of myristoleic acid at the C-1 position and one chain of myristic acid at the C-2 position. The myristoleic acid moiety is derived from milk fats, while the myristic acid moiety is derived from nutmeg and butter. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
PC(18:0/22:5(4Z,7Z,10Z,13Z,16Z)) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(18:0/22:5(4Z,7Z,10Z,13Z,16Z)), in particular, consists of one chain of stearic acid at the C-1 position and one chain of docosapentaenoic acid at the C-2 position. The stearic acid moiety is derived from animal fats, coco butter and sesame oil, while the docosapentaenoic acid moiety is derived from animal fats and brain. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling.While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
PC(O-14:0/16:0) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(O-14:0/16:0), in particular, consists of one chain of Myristyl alcohol at the C-1 position and one chain of palmitic acid at the C-2 position. The Myristyl alcohol moiety is derived from butter oil, while the palmitic acid moiety is derived from fish oils, milk fats, vegetable oils and animal fats. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling. While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
PC(O-16:1(9Z)/14:1(9Z)) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(O-16:1(9Z)/14:1(9Z)), in particular, consists of one chain of Palmitoleyl alcohol at the C-1 position and one chain of myristoleic acid at the C-2 position. The Palmitoleyl alcohol moiety is derived from whale oil, while the myristoleic acid moiety is derived from milk fats. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling. While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
Beta-Cortolone is a Corticosteroid. Corticosteroids are a class of steroid hormones that are produced in the adrenal cortex and are transformed mainly by cytochrome P450 enzymes. Endogenous corticosteroids can be classified. as gluco- or mineralo-corticosteroids, many of which are intimately. related with biological enzyme activities. (PMID:19100888).
PC(O-16:1(9Z)/16:1(9Z)) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(O-16:1(9Z)/16:1(9Z)), in particular, consists of one chain of Palmitoleyl alcohol at the C-1 position and one chain of palmitoleic acid at the C-2 position. The Palmitoleyl alcohol moiety is derived from whale oil, while the palmitoleic acid moiety is derived from animal fats and vegetable oils. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling. While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
PC(O-16:0/18:0) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(O-16:0/18:0), in particular, consists of one chain of Palmityl alcohol at the C-1 position and one chain of stearic acid at the C-2 position. The Palmityl alcohol moiety is derived from animal fats and vegetable oils, while the stearic acid moiety is derived from animal fats, coco butter and sesame oil. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling. While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
PC(O-16:1(9Z)/18:2(9Z,12Z)) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(O-16:1(9Z)/18:2(9Z,12Z)), in particular, consists of one chain of Palmitoleyl alcohol at the C-1 position and one chain of linoleic acid at the C-2 position. The Palmitoleyl alcohol moiety is derived from whale oil, while the linoleic acid moiety is derived from seed oils. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling. While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
PC(O-16:1(9Z)/20:4(8Z,11Z,14Z,17Z)) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(O-16:1(9Z)/20:4(8Z,11Z,14Z,17Z)), in particular, consists of one chain of Palmitoleyl alcohol at the C-1 position and one chain of eicosatetraenoic acid at the C-2 position. The Palmitoleyl alcohol moiety is derived from whale oil, while the eicosatetraenoic acid moiety is derived from fish oils. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling. While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
PC(O-18:0/20:4(8Z,11Z,14Z,17Z)) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(O-18:0/20:4(8Z,11Z,14Z,17Z)), in particular, consists of one chain of Stearyl alcohol at the C-1 position and one chain of eicosatetraenoic acid at the C-2 position. The Stearyl alcohol moiety is derived from beef fat, fish oil, while the eicosatetraenoic acid moiety is derived from fish oils. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling. While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
PC(O-18:1(9Z)/20:4(8Z,11Z,14Z,17Z)) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(O-18:1(9Z)/20:4(8Z,11Z,14Z,17Z)), in particular, consists of one chain of Oleyl alcohol at the C-1 position and one chain of eicosatetraenoic acid at the C-2 position. The Oleyl alcohol moiety is derived from beef fat, fish oil, while the eicosatetraenoic acid moiety is derived from fish oils. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling. While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
PC(O-16:0/22:6(4Z,7Z,10Z,13Z,16Z,19Z)) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(O-16:0/22:6(4Z,7Z,10Z,13Z,16Z,19Z)), in particular, consists of one chain of palmityl alcohol at the C-1 position and one chain of docosahexaenoic acid at the C-2 position. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signalling. While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodelling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also be synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC. PC(O-16:0/22:6(4Z,7Z,10Z,13Z,16Z,19Z)) is found in crustaceans and has been isolated from the Japanese oyster Crassostrea gigas.
PC(O-18:1(9Z)/22:0) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(O-18:1(9Z)/22:0), in particular, consists of one chain of Oleyl alcohol at the C-1 position and one chain of behenic acid at the C-2 position. The Oleyl alcohol moiety is derived from beef fat, fish oil, while the behenic acid moiety is derived from groundnut oil. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling. While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
PC(O-18:2(9Z,12Z)/22:0) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(O-18:2(9Z,12Z)/22:0), in particular, consists of one chain of Linoleyl alcohol at the C-1 position and one chain of behenic acid at the C-2 position. The Linoleyl alcohol moiety is derived from seed oils, while the behenic acid moiety is derived from groundnut oil. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling. While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
PC(O-20:0/20:4(8Z,11Z,14Z,17Z)) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(O-20:0/20:4(8Z,11Z,14Z,17Z)), in particular, consists of one chain of Arachidyl alcohol at the C-1 position and one chain of eicosatetraenoic acid at the C-2 position. The Arachidyl alcohol moiety is derived from corn oil, while the eicosatetraenoic acid moiety is derived from fish oils. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling. While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
PC(O-20:1(11Z)/20:4(8Z,11Z,14Z,17Z)) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(O-20:1(11Z)/20:4(8Z,11Z,14Z,17Z)), in particular, consists of one chain of Eicosenyl alcohol at the C-1 position and one chain of eicosatetraenoic acid at the C-2 position. The Eicosenyl alcohol moiety is derived from vegetable oil, while the eicosatetraenoic acid moiety is derived from fish oils. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling. While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
PC(O-18:0/22:6(4Z,7Z,10Z,13Z,16Z,19Z)) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(O-18:0/22:6(4Z,7Z,10Z,13Z,16Z,19Z)), in particular, consists of one chain of Stearyl alcohol at the C-1 position and one chain of docosahexaenoic acid at the C-2 position. The Stearyl alcohol moiety is derived from beef fat, fish oil, while the docosahexaenoic acid moiety is derived from fish oils. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling. While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
PC(O-18:2(9Z,12Z)/24:0) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(O-18:2(9Z,12Z)/24:0), in particular, consists of one chain of Linoleyl alcohol at the C-1 position and one chain of lignoceric acid at the C-2 position. The Linoleyl alcohol moiety is derived from seed oils, while the lignoceric acid moiety is derived from groundnut oil. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling. While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
PC(O-22:1(13Z)/20:4(8Z,11Z,14Z,17Z)) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(O-22:1(13Z)/20:4(8Z,11Z,14Z,17Z)), in particular, consists of one chain of Erucyl alcohol at the C-1 position and one chain of eicosatetraenoic acid at the C-2 position. The Erucyl alcohol moiety is derived from Rapeseed oil, while the eicosatetraenoic acid moiety is derived from fish oils. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling. While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
PC(O-22:2(13Z,16Z)/22:3(10Z,13Z,16Z)) is a phosphatidylcholine (PC or GPCho). It is a glycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. As is the case with diacylglycerols, glycerophosphocholines can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 16, 18 and 20 carbons are the most common. PC(O-22:2(13Z,16Z)/22:3(10Z,13Z,16Z)), in particular, consists of one chain of Docosadienyl alcohol at the C-1 position and one chain of (10Z,13Z,16Z-docosatrienoyl) at the C-2 position. The Docosadienyl alcohol moiety is derived from animal fat, while the (10Z,13Z,16Z-docosatrienoyl) moiety is derived from fish oils. Phospholipids, are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and signaling. While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PCs can be synthesized via three different routes. In one route, choline is activated first by phosphorylation and then by coupling to CDP prior to attachment to phosphatidic acid. PCs can also synthesized by the addition of choline to CDP-activated 1,2-diacylglycerol. A third route to PC synthesis involves the conversion of either PS or PE to PC.
LysoPC(14:0/0:0) is a lysophospholipid (LyP). It is a monoglycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. Lysophosphatidylcholines can have different combinations of fatty acids of varying lengths and saturation attached at the C-1 (sn-1) position. Fatty acids containing 16, 18 and 20 carbons are the most common. LysoPC(14:0/0:0), in particular, consists of one chain of myristic acid at the C-1 position. The myristic acid moiety is derived from nutmeg and butter. Lysophosphatidylcholine is found in small amounts in most tissues. It is formed by hydrolysis of phosphatidylcholine by the enzyme phospholipase A2, as part of the de-acylation/re-acylation cycle that controls its overall molecular species composition. It can also be formed inadvertently during extraction of lipids from tissues if the phospholipase is activated by careless handling. In blood plasma significant amounts of lysophosphatidylcholine are formed by a specific enzyme system, lecithin:cholesterol acyltransferase (LCAT), which is secreted from the liver. The enzyme catalyzes the transfer of the fatty acids of position sn-2 of phosphatidylcholine to the free cholesterol in plasma, with formation of cholesterol esters and lysophosphatidylcholine. Lysophospholipids have a role in lipid signaling by acting on lysophospholipid receptors (LPL-R). LPL-R's are members of the G protein-coupled receptor family of integral membrane proteins.
LysoPC(16:0) is a lysophospholipid (LyP). It is a monoglycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. Lysophosphatidylcholines can have different combinations of fatty acids of varying lengths and saturation attached at the C-1 (sn-1) position. Fatty acids containing 16, 18 and 20 carbons are the most common. LysoPC(16:0), in particular, consists of one chain of palmitic acid at the C-1 position. The palmitic acid moiety is derived from fish oils, milk fats, vegetable oils and animal fats. Lysophosphatidylcholine is found in small amounts in most tissues. It is formed by hydrolysis of phosphatidylcholine by the enzyme phospholipase A2, as part of the de-acylation/re-acylation cycle that controls its overall molecular species composition. It can also be formed inadvertently during extraction of lipids from tissues if the phospholipase is activated by careless handling. In blood plasma significant amounts of lysophosphatidylcholine are formed by a specific enzyme system, lecithin:cholesterol acyltransferase (LCAT), which is secreted from the liver. The enzyme catalyzes the transfer of the fatty acids of position sn-2 of phosphatidylcholine to the free cholesterol in plasma, with formation of cholesterol esters and lysophosphatidylcholine. Lysophospholipids have a role in lipid signaling by acting on lysophospholipid receptors (LPL-R). LPL-R's are members of the G protein-coupled receptor family of integral membrane proteins.
LysoPC(16:1(9Z)/0:0) is a lysophospholipid (LyP). It is a monoglycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. Lysophosphatidylcholines can have different combinations of fatty acids of varying lengths and saturation attached at the C-1 (sn-1) position. Fatty acids containing 16, 18 and 20 carbons are the most common. LysoPC(16:1(9Z)/0:0), in particular, consists of one chain of palmitoleic acid at the C-1 position. The palmitoleic acid moiety is derived from animal fats and vegetable oils. Lysophosphatidylcholine is found in small amounts in most tissues. It is formed by hydrolysis of phosphatidylcholine by the enzyme phospholipase A2, as part of the de-acylation/re-acylation cycle that controls its overall molecular species composition. It can also be formed inadvertently during extraction of lipids from tissues if the phospholipase is activated by careless handling. In blood plasma significant amounts of lysophosphatidylcholine are formed by a specific enzyme system, lecithin:cholesterol acyltransferase (LCAT), which is secreted from the liver. The enzyme catalyzes the transfer of the fatty acids of position sn-2 of phosphatidylcholine to the free cholesterol in plasma, with formation of cholesterol esters and lysophosphatidylcholine. Lysophospholipids have a role in lipid signaling by acting on lysophospholipid receptors (LPL-R). LPL-R's are members of the G protein-coupled receptor family of integral membrane proteins.
Fucose 1-phosphate (CAS: 16562-58-6) belongs to the class of organic compounds known as monosaccharide phosphates. These are monosaccharides comprising a phosphate group linked to the carbohydrate unit. Fucose 1-phosphate is an intermediate in the reversible synthesis of GDP-L-fucose catalyzed by the enzyme guanosine triphosphate fucose pyrophosphorylase (GFPP, EC 2.7.7.30). The reversible reaction is magnesium-dependent, although the enzyme is partially active when cobalt or manganese is substituted. The reaction is unusual in that, of the four canonical nucleoside triphosphates, only guanosine can be utilized efficiently to form a nucleotide-sugar. Free cytosolic fucose is phosphorylated by L-fucokinase (EC 2.7.1.52) to form fucose-1-phosphate in the salvage pathway of GDP-L-fucose (PMID: 16185085, 14686921).
Isorhamnetin 3-O-[b-D-glucopyranosyl-(1->2)-a-L-rhamnopyranoside] is found in fats and oils. Isorhamnetin 3-O-[b-D-glucopyranosyl-(1->2)-a-L-rhamnopyranoside] is a constituent of Ginkgo biloba (ginkgo).
Compound 4,5-Dihydro-1-benzoxepin-3(2H)-one and derivations are flavorants with watermelon like taste and odou
4',7-Dihydroxy-2',5-dimethoxyisoflavone is found in pulses. 4',7-Dihydroxy-2',5-dimethoxyisoflavone is from Phaseolus coccineus (scarlet runner bean
Vanylglycol, also known as 3-Methoxy-4-hydroxyphenylethyleneglycol (MHPG), belongs to the class of organic compounds known as methoxyphenols. Methoxyphenols are compounds containing a methoxy group attached to the benzene ring of a phenol moiety. It is synthesized from endogenous epinephrine and norepinephrine in vivo. It is found in brain, blood, CSF, and urine, where its concentrations are used to measure catecholamine turnover. Catecholamines play an important role in platelet activation and aggregation, epinephrine being the most potent one. Vanylglycol and pyrocatechol can be biosynthesized from 3,4-dihydroxyphenylglycol and guaiacol; which is catalyzed by the enzyme catechol O-methyltransferase. Vanylglycol is a O-methylated metabolite of normetanephrine. In humans, vanylglycol is involved in the metabolic disorder called tyrosinemia in newborns. Alcohol consumption increases the level of vanylglycol in urine and CSF. Vanylglycol is found normally in urine, in plasma and cerebrospinal fluid. Outside of the human body, vanylglycol has been detected, but not quantified in several different foods, such as blackcurrants, chinese bayberries, elderberries, oriental wheats, and poppies.
Eupatilin is found in herbs and spices. Eupatilin is isolated from Tanacetum vulgare (tansy
Caffeic acid 3-O-glucuronide is a polyphenol metabolite detected in biological fluids (PMID: 20428313).
Caffeic acid 4-O-glucuronide is a polyphenol metabolite detected in biological fluids (PMID: 20428313).
Ketoprofen glucuronide is a natural human metabolite of ketoprofen generated in the liver by UDP glucuonyltransferase. Glucuronidation is used to assist in the excretion of toxic substances, drugs or other substances that cannot be used as an energy source. Glucuronic acid is attached via a glycosidic bond to the substance, and the resulting glucuronide, which has a much higher water solubility than the original substance, is eventually excreted by the kidneys.
Xerocomic acid is found in mushrooms. Xerocomic acid is isolated from Boletus erythropus (dotted-stem bolete) and Gomphidius glutinosus (spike cap
Xerocomic acid is found in mushrooms. Xerocomic acid is isolated from Boletus erythropus (dotted-stem bolete) and Gomphidius glutinosus (spike cap
Metyrosine is only found in individuals that have used or taken this drug. It is an inhibitor of the enzyme tyrosine 3-monooxygenase, and consequently of the synthesis of catecholamines. It is used to control the symptoms of excessive sympathetic stimulation in patients with pheochromocytoma. (Martindale, The Extra Pharmacopoeia, 30th ed)Metyrosine inhibits tyrosine hydroxylase, which catalyzes the first transformation in catecholamine biosynthesis, i.e., the conversion of tyrosine to dihydroxyphenylalanine (DOPA). Because the first step is also the rate-limiting step, blockade of tyrosine hydroxylase activity results in decreased endogenous levels of catecholamines and their synthesis. This consequently, depletes the levels of the catecholamines dopamine, adrenaline and noradrenaline in the body,usually measured as decreased urinary excretion of catecholamines and their metabolites. One main end result of the catecholamine depletion is a decrease in blood presure.
Leonuriside A is found in alcoholic beverages. Leonuriside A is a constituent of Coix lachryma-jobi (Job's tears) and Prunus sp
Melilotoside, also known as trans-beta-D-glucosyl-2-hydroxycinnamic acid or beta-D-glucosyl-2-coumarate, belongs to the class of organic compounds known as phenolic glycosides. These are organic compounds containing a phenolic structure attached to a glycosyl moiety. Some examples of phenolic structures include lignans and flavonoids. Melilotoside is an extremely weak basic (essentially neutral) compound (based on its pKa). Melilotoside is found in herbs and spices. Melilotoside has been isolated from Melilotus alba (white melilot), Melilotus altissimus (tall yellow sweet clover), and other plants.
O-Desmethylangolensin (ODMA) is a metabolite of the soy isoflavone daidzein by intestinal bacteria in approximately 80-90% of persons. Studies suggest beneficial health effects associated with daidzein-metabolizing phenotypes, and there is some small association between ODMA production and some phenotypes. Few dietary factors are associated with daidzein-metabolizing phenotypes. However, it remains unclear why some, but not all, persons harbor ODMA-producing bacteria. ODMA production is inversely associated with age, height, weight, and body mass index. In addition, Asians are less likely than whites to be ODMA producers, and former smokers were more likely than never smokers to be ODMA producers. Investigators have attempted to identify the bacteria involved in ODMA production, and several candidate bacteria were associated, but not definitely identified. ODMA production is correlated with the abundance of methanogens, indicating that the metabolic fate of daidzein may be related to intestinal H(2) metabolism. (PMID: 18326607, 17506823).
Withanolides, which are extracted from Withania somnifera, are employed in the treatment of arthritis and are known to be potent inhibitors of angiogenesis, inflammation and oxidative stress. Withanolides can indeed inhibit the activation of NF-&#954;B and NF-&#954;B-regulated gene expression, which could explain their anti-arthritic actions. W. somnifera root powder has suppressive effect on arthritis by reducing amplification and propagation of the inflammatory response, without causing any gastric damage. (PMID: 17475558, 3248848, 17084827).
Withanolides, which are extracted from Withania somnifera, are employed in the treatment of arthritis and are known to be potent inhibitors of angiogenesis, inflammation and oxidative stress. Withanolides can indeed inhibit the activation of NF-&#954;B and NF-&#954;B-regulated gene expression, which could explain their anti-arthritic actions. W. somnifera root powder has suppressive effect on arthritis by reducing amplification and propagation of the inflammatory response, without causing any gastric damage. (PMID: 17475558, 3248848, 17084827).
p-Hydroxyphenylacetic acid, also known as 4-hydroxybenzeneacetate, is classified as a member of the 1-hydroxy-2-unsubstituted benzenoids. 1-Hydroxy-2-unsubstituted benzenoids are phenols that are unsubstituted at the 2-position. p-Hydroxyphenylacetic acid is considered to be slightly soluble (in water) and acidic.  p-Hydroxyphenylacetic acid can be synthesized from acetic acid. It is also a parent compound for other transformation products, including but not limited to, methyl 2-(4-hydroxyphenyl)acetate, ixerochinolide, and lactucopicrin 15-oxalate.  p-Hydroxyphenylacetic acid can be found in numerous foods such as olives, cocoa beans, oats, and mushrooms. p-Hydroxyphenylacetic acid can be found throughout all human tissues and in all biofluids. Within a cell, p-hydroxyphenylacetic acid is primarily located in the cytoplasm and in the extracellular space. p-Hydroxyphenylacetic acid is also a microbial metabolite produced by Acinetobacter, Clostridium, Klebsiella, Pseudomonas, and Proteus. Higher levels of this metabolite are associated with an overgrowth of small intestinal bacteria from Clostridia species including C. difficile, C. stricklandii, C. lituseburense, C. subterminale, C. putrefaciens, and C. propionicum (PMID: 476929, 12173102). p-Hydroxyphenylacetic acid is detected after the consumption of whole grain.
6-Hydroxy-1H-indole-3-acetamide is found in mushrooms. 6-Hydroxy-1H-indole-3-acetamide is an alkaloid from the edible mushroom Agrocybe cylindrace
3-Formyl-6-hydroxyindole is found in mushrooms. 3-Formyl-6-hydroxyindole is an alkaloid from the edible mushroom Agrocybe cylindrace
5-Bromotryptophan (CAS: 6548-09-0) belongs to the class of organic compounds known as indolyl carboxylic acids and derivatives. Indolyl carboxylic acids and derivatives are compounds containing a carboxylic acid chain (of at least 2 carbon atoms) linked to an indole ring. 5-Bromotryptophan has been identified in blood (PMID: 31396400).
Caprylic acid is the common name for the eight-carbon straight-chain fatty acid known by the systematic name octanoic acid. It is found naturally in coconuts and breast milk. It is an oily liquid with a slightly unpleasant rancid taste that is minimally soluble in water. Caprylic acid is used commercially in the production of esters used in perfumery and also in the manufacture of dyes (Wikipedia). Caprylic acid can be found in numerous foods such as Prunus (Cherry, Plum), pineapple sages, black raspberries, and shallots. Caprylic acid is found to be associated with medium-chain acyl-CoA dehydrogenase deficiency, which is an inborn error of metabolism.
Methionyl-Valine is a dipeptide composed of methionine and valine. It is an incomplete breakdown product of protein digestion or protein catabolism. Some dipeptides are known to have physiological or cell-signaling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis. This dipeptide has not yet been identified in human tissues or biofluids and so it is classified as an 'Expected' metabolite.
(3S,3'R,5R,6R)-7',8'-Didehydro-3,6-epoxy-5,6-dihydro-beta,beta-carotene-3',5-diol is found in mollusks. (3S,3'R,5R,6R)-7',8'-Didehydro-3,6-epoxy-5,6-dihydro-beta,beta-carotene-3',5-diol is a constituent of the oyster Crassostrea gigas.
Hydroxychloroquine is only found in individuals that have used or taken this drug. It is a chemotherapeutic agent that acts against erythrocytic forms of malarial parasites.Although the exact mechanism of action is unknown, it may be based on ability of hydroxychloroquine to bind to and alter DNA. Hydroxychloroquine has also has been found to be taken up into the acidic food vacuoles of the parasite in the erythrocyte. This increases the pH of the acid vesicles, interfering with vesicle functions and possibly inhibiting phospholipid metabolism. In suppressive treatment, hydroxychloroquine inhibits the erythrocytic stage of development of plasmodia. In acute attacks of malaria, it interrupts erythrocytic schizogony of the parasite. Its ability to concentrate in parasitized erythrocytes may account for their selective toxicity against the erythrocytic stages of plasmodial infection. As an antirheumatic, hydroxychloroquine is thought to act as a mild immunosuppressant, inhibiting the production of rheumatoid factor and acute phase reactants. It also accumulates in white blood cells, stabilizing lysosomal membranes and inhibiting the activity of many enzymes, including collagenase and the proteases that cause cartilage breakdown.
Zapotinin is found in pomes. Zapotinin is a constituent of Casimiroa edulis (Mexican apple)
1-Isothiocyanatohexane is found in brassicas. 1-Isothiocyanatohexane is isolated from radish (Raphanus sativus) and other crucifers.
Phenol sulphate, also known as phenylsulfate or aryl sulphate, belongs to the class of organic compounds known as phenylsulfates. Phenylsulfates are compounds containing a sulfate group conjugated to a phenyl group. In normal humans, phenol sulphate is primarily a gut-derived metabolite that arises from the activity of the bacterial enzyme tyrosine phenol-lyase, which is responsible for the synthesis of phenol from dietary tyrosine (PMID: 31015435). Phenol sulphate can also arise from the consumption of phenol or from phenol poisoning (PMID: 473790). Phenol sulphate is produced from the conjugation of phenol with sulphate in the liver. In particular, phenol sulphate can be biosynthesized from phenol and phosphoadenosine phosphosulfate through the action of the enzyme sulfotransferase 1A1 in the liver. Phenol sulphate can be found in most mammals (mice, rats, sheep, dogs, humans) and likely most animals. Phenol sulphate is a uremic toxin (PMID: 30068866). It is a protein-bound uremic solute that induces reactive oxygen species (ROS) production and decreases glutathione levels, rendering cells vulnerable to oxidative stress (PMID: 29474405).  In experimental models of diabetes, phenol sulphate administration has been shown to induce albuminuria and podocyte damage. In a diabetic patient cohort, phenol sulphate levels were found to significantly correlate with basal and predicted 2-year progression of albuminuria in patients with microalbuminuria (PMID: 31015435).
3-Mercaptolactic acid is a thiol that has been confirmed to be found in urine (PMID 8852041).
Spermic acid 2 is a diamide which is identified as urinary metabolites. of putrescine and spermine, and was subsequently identified and quantified. in urines of healthy persons and cancer patients.
(E)-2',4,4'-Trihydroxy-3-prenylchalcone is found in herbs and spices. (E)-2',4,4'-Trihydroxy-3-prenylchalcone is a constituent of hairy root cultures of Glycyrrhiza glabra (licorice)
Vanillactic acid, also known as vanillactate or VLA, belongs to the class of organic compounds known as phenylpropanoic acids. Phenylpropanoic acids are compounds with a structure containing a benzene ring conjugated to a propanoic acid. Vanillactic acid is a potentially toxic compound. Vanillactic acid has been linked to the inborn metabolic disorders including aromatic l-amino acid decarboxylase deficiency. Vanillactic acid is an acidic catecholamine metabolite present in normal human urine (PMID 7524950), in normal human CSF (PMID 7914240), and increased in the CSF of newborns with neonatal epileptic encephalopathy mimicking aromatic L-amino acid decarboxylase deficiency (PMID 12200739).
Ribothymidine is an endogenous methylated nucleoside found in human fluids; methylated purine bases are present in higher amounts in tumor-bearing patients compared to healthy controls.DNA hypermethylation is a common finding in malignant cells and has been explored as a therapeutic target for hypomethylating agents. When chemical bonds to DNA, the DNA becomes damaged and proper and complete replication cannot occur to make the normal intended cell. A DNA adduct is an abnormal piece of DNA covalently-bonded to a cancer-causing chemical. This has shown to be the start of a cancerous cell, or carcinogenesis. DNA adducts in scientific experiments are used as bio-markers and as such are themselves measured to reflect quantitatively, for comparison, the amount of cancer in the subject. (PMID:3506820, 17044778, 17264127, 16799933).
Vanillactic acid, also known as vanillactate or VLA, belongs to the class of organic compounds known as phenylpropanoic acids. Phenylpropanoic acids are compounds with a structure containing a benzene ring conjugated to a propanoic acid. Vanillactic acid is a potentially toxic compound. Vanillactic acid has been linked to the inborn metabolic disorders including aromatic l-amino acid decarboxylase deficiency. Vanillactic acid is an acidic catecholamine metabolite present in normal human urine (PMID 7524950), in normal human CSF (PMID 7914240), and increased in the CSF of newborns with neonatal epileptic encephalopathy mimicking aromatic L-amino acid decarboxylase deficiency (PMID 12200739).
(S)-Pterosin A is found in green vegetables. (S)-Pterosin A is a constituent of Pteridium aquilinum (bracken fern)
Methylprotodioscin is found in herbs and spices. Methylprotodioscin is isolated from seeds of Trigonella caerulea (sweet trefoil) and Asparagus officinalis (asparagus).
Clofibrate is only found in individuals that have used or taken this drug. It is a fibric acid derivative used in the treatment of hyperlipoproteinemia type III and severe hypertriglyceridemia (from Martindale, <i>The Extra Pharmacopoeia</i>, 30th ed, p986). Clofibrate increases the activity of extrahepatic lipoprotein lipase (LL), thereby increasing lipoprotein triglyceride lipolysis. Chylomicrons are degraded, VLDLs are converted to LDLs, and LDLs are converted to HDL. This is accompanied by a slight increase in secretion of lipids into the bile and ultimately the intestine. Clofibrate also inhibits the synthesis and increases the clearance of apolipoprotein B, a carrier molecule for VLDL. Also, as a fibrate, clofibrate is an agonist of the PPAR-&#945; receptor[4] in muscle, liver, and other tissues. This agonism ultimately leads to modification in gene expression resulting in increased beta-oxidation, decreased triglyceride secretion, increased HDL, increased lipoprotein lipase activity.
Clofibrate is only found in individuals that have used or taken this drug. It is a fibric acid derivative used in the treatment of hyperlipoproteinemia type III and severe hypertriglyceridemia (from Martindale, <i>The Extra Pharmacopoeia</i>, 30th ed, p986). Clofibrate increases the activity of extrahepatic lipoprotein lipase (LL), thereby increasing lipoprotein triglyceride lipolysis. Chylomicrons are degraded, VLDLs are converted to LDLs, and LDLs are converted to HDL. This is accompanied by a slight increase in secretion of lipids into the bile and ultimately the intestine. Clofibrate also inhibits the synthesis and increases the clearance of apolipoprotein B, a carrier molecule for VLDL. Also, as a fibrate, clofibrate is an agonist of the PPAR-&#945; receptor[4] in muscle, liver, and other tissues. This agonism ultimately leads to modification in gene expression resulting in increased beta-oxidation, decreased triglyceride secretion, increased HDL, increased lipoprotein lipase activity.
Vanillactic acid, also known as vanillactate or VLA, belongs to the class of organic compounds known as phenylpropanoic acids. Phenylpropanoic acids are compounds with a structure containing a benzene ring conjugated to a propanoic acid. Vanillactic acid is a potentially toxic compound. Vanillactic acid has been linked to the inborn metabolic disorders including aromatic l-amino acid decarboxylase deficiency. Vanillactic acid is an acidic catecholamine metabolite present in normal human urine (PMID 7524950), in normal human CSF (PMID 7914240), and increased in the CSF of newborns with neonatal epileptic encephalopathy mimicking aromatic L-amino acid decarboxylase deficiency (PMID 12200739).
Guanosine cyclic 3',5'-(hydrogen phosphate). A guanine nucleotide containing one phosphate group which is esterified to the sugar moiety in both the 3'- and 5'-positions. It is a cellular regulatory agent and has been described as a second messenger. Its levels increase in response to a variety of hormones, including acetylcholine, insulin, and oxytocin and it has been found to activate specific protein kinases. (From Merck Index, 11th ed).
Deoxyadenosine monophosphate (dAMP), also known as deoxyadenylic acid or deoxyadenylate in its conjugate acid and conjugate base forms, respectively, is a derivative of the common nucleic acid AMP, or adenosine monophosphate, in which the -OH (hydroxyl) group on the 2' carbon on the nucleotide's pentose has been reduced to just a hydrogen atom (hence the "deoxy-" part of the name). Additionally, the monophosphate of the name indicates that two of the phosphoryl groups of GTP have been removed, most likely by hydrolysis. It is a monomer used in DNA.
Deoxyinosine is a nucleoside that is formed when hypoxanthine is attached to a deoxyribose ring (also known as a ribofuranose) via a beta-N9-glycosidic bond. Deoxyinosine is found in DNA while inosine is found in RNA. Inosine is a nucleic acid important for RNA editing. Adenosine deaminase (ADA) catalyzes the conversion of adenosine and deoxyadenosine to inosine and deoxyinosine, respectively. ADA-deficient individuals suffer from severe combined immunodeficiency (SCID) and are unable to produce significant numbers of mature T or B lymphocytes. This occurs as a consequence of the accumulation of ADA substrates or their metabolites. Inosine is also an intermediate in a chain of purine nucleotides reactions required for muscle movements. Moreover, deoxyinosine is found to be associated with purine nucleoside phosphorylase (PNP) deficiency, which is an inborn error of metabolism.
D-Erythrose 4-phosphate is a phosphorylated derivative of erythrose that serves as an important intermediate in the pentose phosphate pathway. It is also used in phenylalanine, tyrosine and tryptophan biosynthesis, and it plays a role in vitamin B6 metabolism (KEGG).
Dexamethasone is only found in individuals that have used or taken this drug. It is an anti-inflammatory 9-fluoro-glucocorticoid. Dexamethasone is a glucocorticoid agonist. It is used for its antiinflammatory or immunosuppressive properties and ability to penetrate the CNS, dexamethasone is used alone to manage cerebral edema and with tobramycin to treat corticosteroid-responsive inflammatory ocular conditions. Dexamethasone can be used in the context of congenital adrenal hyperplasia, to prevent virilisation of a female fetus. Unbound dexamethasone crosses cell membranes and binds with high affinity to specific cytoplasmic glucocorticoid receptors. This complex binds to DNA elements (glucocorticoid response elements) which results in a modification of transcription and, hence, protein synthesis in order to achieve inhibition of leukocyte infiltration at the site of inflammation, interference in the function of mediators of inflammatory response, suppression of humoral immune responses, and reduction in edema or scar tissue. The antiinflammatory actions of dexamethasone are thought to involve phospholipase A<sub>2</sub> inhibitory proteins, lipocortins, which control the biosynthesis of potent mediators of inflammation such as prostaglandins and leukotrienes. Dexamethasone has been shown to exhibit anesthetic, anti-microbial, appetite stimulant, muscle building and sedative functions (PMID 16571981, 19842390, 11563572, 20080405, 2898201). Its potency is about 20-30 times that of hydrocortisone and 4-5 times of prednisone.
Galactonolactone has been determined in human urine by reversed-phase HPLC for the specific evaluation of metabolic by-products in the urine of galactosemic patients and based on the simultaneous determination of gluconolactone, galactonolactone and galactitol. (PMID: 1797843). Patients with galactose-1-phosphate uridyltransferase (GALT) deficiency, given a load of galactose have been shown to excrete six times as much galactonate in their urine as normal subjects exposed to the same experimental conditions. The production of galactonate occurs through the activity of a soluble NAD+-dependent galactose dehydrogenase, catalyzing the conversion of galactose to D-galactonolactone (D-galactose: NAD+ oxidoreductase, EC 1.1.1.48). (OMMBID).
There are two forms of glutamic acid found in nature: L-glutamic acid and D-glutamic acid. D-glutamic acid, is not endogenously produced in higher mammals. It is found naturally primarily in the cell walls of certain bacteria. D-glutamate is also present in certain foods e.g., soybeans and also arises from the turnover of the intestinal tract microflora, whose cell walls contain significant D-glutamate. Unlike other D-amino acids, D-glutamate is not oxidized by the D-amino acid oxidases, and therefore this detoxification pathway is not available for handling D-glutamate. Likewise, D-glutamic acid, when ingested, largely escapes most deamination reactions (unlike the L-counterpart). Free D-glutamate is found in mammalian tissue at surprisingly high levels, with D-glutamate accounting for 9% of the total glutamate present in liver. D-glutamate is the most potent natural inhibitor of glutathione synthesis identified to date and this may account for its localization to the liver, since circulating D-glutamate may alter redox stabiity (PMID 11158923). Certain eels are known to use D-glutamic acid as a phermone for chemical communication. D-Glutamic acid has been found to be a metabolite of Lactobacillus (PMID: 22754309).
Dihydroxyacetone phosphate is an important intermediate in lipid biosynthesis and in glycolysis. Dihydroxyacetone phosphate is found to be associated with transaldolase deficiency, which is an inborn error of metabolism. Dihydroxyacetone phosphate has been identified in the human placenta (PMID: 32033212).
D-Mannose 1-phosphate (CAS: 27251-84-9) is a normal metabolite intermediate in fructose and mannose metabolism. It is a substrate of phosphomannomutase 1 (PMM, EC 5.4.2.8), an enzyme necessary for the synthesis of GDP-mannose (a substrate for dolichol-linked oligosaccharide synthesis). PMM converts mannose 6-phosphate into mannose-1-phosphate. A deficiency of phosphomannomutase in carbohydrate-deficient glycoprotein syndrome (CDGS) type I is associated with a decreased synthesis of mannose 1-phosphate. CDGS is a group of autosomal recessively transmitted disorders in which abnormally glycosylated proteins are formed (PMID: 9451026, 8549746, 12729595).
Tryptophan (Trp or W) (sold for medical use as Tryptan) is one of the 20 standard amino acids. Its distinguishing structural characteristic is its indole functional group. The D-stereoisomer is occasionally found in naturally produced peptides (e.g. contryphan, the marine venom peptide).
Galactose 1-phosphate, also known as D-Galactose-1-phosphate or alpha-D-gal-1-P, belongs to the class of organic compounds known as monosaccharide phosphates. These are monosaccharides comprising a phosphate group linked to the carbohydrate unit. Galactose-1-phosphate is an intermediate in the interconversion of glucose and uridine diphosphate galactose. Galactose 1-phosphate exists in all living species, ranging from bacteria to plants to humans. Within humans, galactose 1-phosphate participates in a number of enzymatic reactions. In particular, uridine diphosphate glucose and galactose 1-phosphate can be biosynthesized from uridine diphosphategalactose and glucose 1-phosphate; which is mediated by the enzyme galactose-1-phosphate uridylyltransferase (GALT). In addition, galactose 1-phosphate can be biosynthesized from D-galactose through the action of the enzyme galactokinase. The improper metabolism of galactose-1-phosphate is a characteristic of a condition known as galactosemia (PMID: 7671964). Type I galactosemia is a genetic disorder that is caused by the impairment of galactose-1-phosphate uridylyltransferase (EC 2.7.7.12). Evidence suggests that misfolding of the galactose 1-phosphate uridylyltransferase enzyme is the underlying cause of type I galactosemia (PMID: 23583749). Outside of the human body, galactose 1-phosphate has been detected, but not quantified in, several different foods, such as gooseberries, anises, turmerics, caraway, and cumins.
Gluconolactone, also known as glucono-delta-lactone or GDL (gluconate), belongs to the class of organic compounds known as gluconolactones. These are polyhydroxy acids (PHAs) containing a gluconolactone molecule, which is characterized by a tetrahydropyran substituted by three hydroxyl groups, one ketone group, and one hydroxymethyl group. Gluconolactone is a lactone of D-gluconic acid. Gluconolactone can be produced by enzymatic oxidation of D-glucose via the enzyme glucose oxidase. It is a fundamental metabolite found in all organisms ranging from bacteria to plants to animals. Gluconolactone has metal chelating, moisturizing and antioxidant activities. Its ability in free radicals scavenging accounts for its antioxidant properties. Gluconolactone, is also used as a food additive with the E-number E575. In foods it is used as a sequestrant, an acidifier or a curing, pickling, or leavening agent. Gluconolactone is also used as a coagulant in tofu processing. Gluconolactone is widely used as a skin exfoliant in cosmetic products, where it is noted for its mild exfoliating and hydrating properties. Pure gluconolactone is a white odorless crystalline powder. It is pH-neutral, but hydrolyses in water to gluconic acid which is acidic, adding a tangy taste to foods. Gluconic acid has roughly a third of the sourness of citric acid. One gram of gluconolactone yields roughly the same amount of metabolic energy as one gram of sugar.
Glucosamine 6-phosphate (CAS: 3616-42-0) is normally produced in endothelial cells via de novo glucosamine synthesis by the enzyme fructose-6-phosphate amidotransferase and the modulation of this pathway by hyperglycemia and glutamine. Glutamine-fructose-6-phosphate amidotransferase (GFAT) catalyzes the first committed step in the pathway for biosynthesis of hexosamines in mammals.It is a member of the N-terminal nucleophile class of amidotransferases, GFAT transfers the amino group from the L-glutamine amide to D-fructose 6-phosphate, producing glutamic acid and glucosamine 6-phosphate. As glucosamine inhibits endothelial nitric oxide synthesis it has important implications for impaired endothelium-dependent relaxation and vascular dysfunction in diabetes mellitus (PMID:11270676, 11842094).
Guanosine monophosphate (GMP), also known as 5′-guanidylic acid or guanylic acid (conjugate base guanylate), is a nucleotide that is used as a monomer in RNA. It is an ester of phosphoric acid with the nucleoside guanosine. GMP consists of the phosphate group, the pentose sugar ribose, and the nucleobase guanine; hence it is a ribonucleoside monophosphate. Guanosine monophosphate is commercially produced by microbial fermentation. Guanosine monophosphate, also known as guanylic acid or 5'-GMP, belongs to the class of organic compounds known as purine ribonucleoside monophosphates. These are nucleotides consisting of a purine base linked to a ribose to which one monophosphate group is attached. A guanine nucleotide containing one phosphate group esterified to the sugar moiety and found widely in nature. Guanosine monophosphate exists in all living species, ranging from bacteria to humans. Within humans, guanosine monophosphate participates in a number of enzymatic reactions. In particular, guanosine triphosphate and guanosine monophosphate can be biosynthesized from diguanosine tetraphosphate through its interaction with the enzyme bis(5'-nucleosyl)-tetraphosphatase [asymmetrical]. In addition, guanosine monophosphate can be biosynthesized from guanosine diphosphate; which is mediated by the enzyme ectonucleoside triphosphate diphosphohydrolase 5. In humans, guanosine monophosphate is involved in the metabolic disorder called the lesch-nyhan syndrome (lns) pathway. Outside of the human body, guanosine monophosphate has been detected, but not quantified in several different foods, such as common cabbages, tea, winter squash, spearmints, and sugar apples.
Hydroxykynurenine is a free radical generator and a bioprecursor quinolinic acid which is a endogenous excitotoxin (PMID 16697652). It is a product of enzyme kynurenine 3-monooxygenase in the tryptophan catabolism pathway (Reactome http://www.reactome.org).
IDP is an inosine nucleotide containing a pyrophosphate group esterified to C5 of the sugar moiety.
Inosine triphosphate (ITP) is an intermediate in the purine metabolism pathway. Relatively high levels of ITP in red cells are found in individuals as result of deficiency of inosine triphosphatase (EC 3.1.3.56, ITPase) ITPase is a cytosolic nucleoside triphosphate pyrophosphohydrolase specific for ITP catalysis to inosine monophosphate (IMP) and deoxy-inosine triphosphate (dITP) to deoxy-inosine monophosphate. ITPase deficiency is not associated with any defined pathology other than the characteristic and abnormal accumulation of ITP in red blood cells. Nevertheless, ITPase deficiency may have pharmacogenomic implications, and the abnormal metabolism of 6-mercaptopurine in ITPase-deficient patients may lead to thiopurine drug toxicity. ITPase's function is not clearly understood but possible roles for ITPase could be to prevent the accumulation of rogue nucleotides which would be otherwise incorporated into DNA and RNA, or compete with nucleotides such as GTP in signalling processes. (PMID: 170291, 1204209, 17113761, 17924837).
Isoxanthopterin is a pteridine normally present in plasma, urine, and other bodily fluids also vary from normal concentrations in some disease states and also have diagnostic value. Pteridines' urinary concentrations seem to vary independently from each other and from normal values to yield a pattern of excreted pteridines that is diagnostic for different species, tissues, and tumor types. Intravenous or intramuscular administration of isoxanthopterin inhibits the growth rates of animal tumor models. Pteridin derivatives are a family of organic compound with very similar chemical structures which play an important biochemistry role. Pteridines metabolism and its regulation in normal and pathological conditions have not been extensively investigated due to the difficulty of their quantification. A significant decrease of isoxanthopterin has been determined in cancer patients. (PMID 15837549, 9800651). Xanthine dehydrogenase (XDH) is the enzymes responsible for the conversion of xanthine to uric acid. It requires the presence of the molybdenum cofactor for its proper functioning. XDH is reported to have additional functions, i.e., the conversion of pterin to isoxanthopterin, one of the steps the degradation pathway of 5,6,7,8-tetrahydrobiopterin (BH4). Isoxanthopterin is very low in some cases of hereditary xanthinuria (OMIM 278300) and molybdenum cofactor deficiency (OMIM 252150). (PMID: 8812740).
L-alloisoleucine is a branched chain amino acid and is a stereo-isomer of L-isoleucine. It is a common constituent of human plasma (albeit at low levels). L-alloisoleucine is produced as a byproduct of isoleucine transamination. L-Isoleucine is one of the four common amino acids (the 3 others being threonine, hydroxyproline, and hydroxylysine) that have two asymmetric carbon atoms which produce four structural possibilities for the same chemical composition. L-alloisoleucine differs from L-isoleucine by having having different stereochemistry around its beta carbon. Plasma L-alloisoleucine, which is derived from L-isoleucine in vivo, can be used for the diagnosis of maple syrup urine disease (MSUD), a genetic disorder. Indeed, plasma L-alloisoleucine levels above 5 umol/L is the most specific and most sensitive diagnostic marker for all forms of MSUD (PMID: 10508118). In MSUD the degradation of the essential branched-chain L-amino acids leucine, valine, and isoleucine and their derived 2-oxoacids is impaired because of an inherited deficiency in branched-chain 2-oxoacid dehydrogenase complex (EC 1.2.4.4) activity. The accumulation of branched-chain compounds in blood and other body fluids can exert neurotoxic effects.
L-Dihydroorotic acid, also known as (S)-4,5-dihydroorotate or dihydro-L-orotate, belongs to the class of organic compounds known as alpha amino acids and derivatives. These are amino acids in which the amino group is attached to the carbon atom immediately adjacent to the carboxylate group (alpha carbon), or a derivative thereof. 4,5-Dihydroorotic acid is a derivative of orotic acid which serves as an intermediate in pyrimidine biosynthesis. L-Dihydroorotic acid is a drug. L-Dihydroorotic acid exists in all living species, ranging from bacteria to humans. Within humans, L-dihydroorotic acid participates in a number of enzymatic reactions. In particular, L-dihydroorotic acid can be biosynthesized from ureidosuccinic acid; which is catalyzed by the enzyme cad protein. In addition, L-dihydroorotic acid and quinone can be converted into orotic acid through the action of the enzyme dihydroorotate dehydrogenase (quinone), mitochondrial. In humans, L-dihydroorotic acid is involved in the metabolic disorder called the beta-ureidopropionase deficiency pathway. Outside of the human body, L-dihydroorotic acid has been detected, but not quantified in several different foods, such as black chokeberries, vanilla, sweet basils, soy beans, and broad beans.
Xylose or wood sugar is an aldopentose - a monosaccharide containing five carbon atoms and an aldehyde functional group. It has chemical formula C5H10O5 and is 40% as sweet as sucrose. Xylose is found in the embryos of most edible plants. The polysaccharide xylan, which is closely associated with cellulose, consists practically entirely of d-xylose. Corncobs, cottonseed hulls, pecan shells, and straw contain considerable amounts of this sugar. Xylose is also found in mucopolysaccharides of connective tissue and sometimes in the urine. Xylose is the first sugar added to serine or threonine residues during proteoglycan type O-glycosylation. Therefore xylose is involved in the biosythetic pathways of most anionic polysaccharides such as heparan sulphate and chondroitin sulphate. In medicine, xylose is used to test for malabsorption by administering a xylose solution to the patient after fasting. If xylose is detected in the blood and/or urine within the next few hours, it has been absorbed by the intestines. Xylose is said to be one of eight sugars which are essential for human nutrition, the others being galactose, glucose, mannose, N-acetylglucosamine, N-acetylgalactosamine, fucose, and sialic acid. (Wikipedia). Xylose in the urine is a biomarker for the consumption of apples and other fruits.
L-Threoneopterin is a catabolic product of GTP. It is synthesized by macrophages upon stimulation by interferon-gamma. It is used as a marker of HIV infection. It belongs to the chemical group known as pterins. Neopterin is a pteridine derivative present in body fluids; elevated levels result from immune system activation, malignant disease, allograft rejection, and viral infections (From Stedman, 26th ed). Neopterin also serves as a precursor in the biosynthesis of biopterin.
Nicotinamide ribotide (NMN) (CAS: 1094-61-7) is an important intermediate metabolite in the nicotinate and nicotinamide metabolism pathway. Mammals predominantly use nicotinamide rather than nicotinic acid as a precursor for NAD biosynthesis. Instead of the deamidation into nicotinic acid, nicotinamide is directly converted into NMN by nicotinamide phosphoribosyltransferase (NAMPT, EC 2.4.2.12). The enzyme nicotinamide mononucleotide adenylyltransferase (NMNAT, EC 2.7.7.1), which is a member of the nucleotidyltransferase alpha/beta-phosphodiesterase superfamily, catalyzes the reaction NMN + ATP <=> nicotinamide adenine dinucleotide (NAD) + PPi, representing the final step in the biosynthesis of NAD. NAD is a molecule that plays a fundamental role as a cofactor in cellular redox reactions. Thus NMN is an important metabolite for the maintenance of normal NAD biosynthesis. Circulating NMN levels may play an important role in regulating cell function in physiological and pathophysiological conditions (PMID: 15078171, 17983582).
Orotidylic acid (OMP), is a pyrimidine nucleotide which is the last intermediate in the biosynthesis of uridine monophosphate. Decarboxylation by Orotidylate decarboxylase affords Uridine 5'-phosphate which is the route to Uridine and its derivatives de novo and consequently one of the most important processes in nucleic acid synthesis (Dictionary of Organic Compounds). In humans, the enzyme UMP synthase converts OMP into uridine 5'- monophosphate. If UMP synthase is defective, orotic aciduria can result. (Wikipedia).
Phosphoserine is the phosphoric acid ester of the amino acid serine. It is found in essentially all living organisms ranging from microbes to plants to mammals. Phosphoserine is a component of many proteins as the result of posttranslational modifications to the native protein‚Äôs serine residue(s). The phosphorylation of the hydroxyl functional group in serine to produce phosphoserine is catalyzed by various types of kinases. Serine is one of three amino acid residues that are commonly phosphorylated by kinases during cell signalling in eukaryotes. Free phosphoserine is found in many biofluids and likely arises from the proteolysis of proteins containing phosphoserine residues (PMID: 7693088).
Porphobilinogen (PBG) is a pyrrole-containing intermediate in the biosynthesis of porphyrins. It is generated from aminolevulinate (ALA) by the enzyme ALA dehydratase. Porphobilinogen is then converted into hydroxymethylbilane by the enzyme porphobilinogen deaminase (also known as hydroxymethylbilane synthase). Under certain conditions, porphobilinogen can act as a phototoxin, a neurotoxin, and a metabotoxin. A phototoxin leads to cell damage upon exposure to light. A neurotoxin causes damage to nerve cells and nerve tissues. A metabotoxin is an endogenously produced metabolite that causes adverse health effects at chronically high levels. Chronically high levels of porphyrins are associated with porphyrias such as porphyria variegate, acute intermittent porphyria, and hereditary coproporphyria (HCP). There are several types of porphyrias (most are inherited). Hepatic porphyrias are characterized by acute neurological attacks (seizures, psychosis, extreme back and abdominal pain, and an acute polyneuropathy), while the erythropoietic forms present with skin problems (usually a light-sensitive blistering rash and increased hair growth). The neurotoxicity of porphyrins may be due to their selective interactions with tubulin, which disrupt microtubule formation and cause neural malformations (PMID: 3441503).
Pterin is a chemical compound composed of a pyrazine ring and a pyrimidine ring; the pyrimidine ring has a carbonyl oxygen and an amino group. Several tautomers of pterin exist and are shown below. Pterin belongs to the pteridine family of heterocycles. -- Wikipedia.
Raffinose is a complex carbohydrate. It is a trisaccharide composed of galactose, fructose, and glucose. It can be found in beans, cabbage, brussels sprouts, broccoli, asparagus, other vegetables, and whole grains. Raffinose is hydrolyzed to D-galactose and sucrose by D-galactosidase (D-GAL). D-GAL also hydrolyzes other D-galactosides such as stachyose, verbascose, and galactinol [1-O-(D-galactosyl)-myoinositol], if present. The enzyme does not cleave linked galactose, as in lactose. Raffinose is also known as melitose and may be thought of as galactose and sucrose connected via an alpha(1->6) glycosidic linkage. Thus, raffinose can be broken down into galactose and sucrose via the enzyme alpha-galactosidase. Human intestines do not contain this enzyme. Raffinose is a trisaccharide occurring in Australian manna (from Eucalyptus spp, Myrtaceae) and in cottonseed meal.
Uridine diphosphate-N-acetylglucosamine (uridine 5'-diphosphate-GlcNAc, or UDP-Glc-NAc) is an acetylated aminosugar nucleotide. UDP-GlcNAc is the donor substrate for modification of nucleocytoplasmic proteins at serine and threonine residues with N-acetylglucosamine (O-GlcNAc). Nutrient sensing in mammals is done through the hexosamine biosynthetic pathway (HSP), which produces uridine 5'-diphospho-N-acetylglucosamine (UDP-Glc-NAc) as its end product. Mammals respond to nutrient excess by activating O-GlcNAcylation (addition of O-linked N-acetylglucosamine). O-GlcNAc addition (and removal) is key to histone remodeling, transcription, proliferation, apoptosis, and proteasomal degradation. This nutrient-responsive signaling pathway also modulates important cellular pathways, including the insulin signaling cascade in. Alterations in O-GlcNAc metabolism are associated with various human diseases including diabetes mellitus and neurodegeneration. (PMID: 16317114) Due to the chemical makeup of UDP-GlcNAc, it is well positioned to serve as a glucose sensor in that it is a high-energy compound that requires and/or responds to glucose, amino acid, fatty acid and nucleotide metabolism for synthesis. Elevated levels of O-GlcNAc have an effect on insulin-stimulated glucose uptake. (PMID: 12678487).
17a-Hydroxypregnenolone is a 21-carbon steroid that is converted from pregnenolone by cytochrome P450 17alpha hydroxylase/C17,20 lyase (CYP17, EC 1.14.99.9). 17a-Hydroxypregnenolone is an intermediate in the delta-5 pathway of biosynthesis of gonadal steroid hormones and the adrenal corticosteroids. The first, rate-limiting and hormonally regulated step in the biosynthesis of all steroid hormones is the conversion of cholesterol to pregnenolone. The conversion of cholesterol to pregnenolone is accomplished by the cleavage of the cholesterol side chain, catalyzed by a mitochondrial cytochrome P450 enzyme termed P450scc where scc designates Side Chain Cleavage. All steroid hormones are made from the pregnenolone produced by P450scc; thus, the presence or absence of each of the activities of CYP17 directs this pregnenolone towards its final metabolic pathway. While all cytochrome P450 enzymes can catalyze multiple reactions on a single active site, CYP17 is the only one described to date in which these multiple activities are differentially regulated by a physiologic process. 17a-Hydroxypregnenolone is converted to dehydroepiandrosterone by the 17,20 lyase activity of CYP17. The ratio of the 17,20 lyase to 17 alpha-hydroxylase activity of CYP17 determines the ratio of C21 to C19 steroids produced. This ratio is regulated post-translationally by at least three factors: the abundance of the electron-donating protein P450 oxidoreductase, the presence of cytochrome b5, and the serine phosphorylation of CYP17. (PMID: 12573809).
(S)-Propane-1,2-diol, also known as (S)-1,2-propanediol or (S)-propylene glycol, belongs to the class of organic compounds known as 1,2-diols. These are polyols containing an alcohol group at two adjacent positions. (S)-Propane-1,2-diol is an extremely weak basic (essentially neutral) compound (based on its pKa). (S)-Propane-1,2-diol has been detected, but not quantified in, several different foods, such as common buckwheats, mustard spinach, sugar apples, black crowberries, and bayberries. This could make (S)-propane-1,2-diol a potential biomarker for the consumption of these foods. (S)-Propane-1,2-diol is a clear, colourless, viscous organic solvent and diluent used in pharmaceutical preparations.
2-Phospho-D-glycerate or 2PG is an intermediate in gluconeogenesis. It is a glyceric acid which serves as the substrate in the ninth step of glycolysis. 2PG is converted by enolase into phosphoenolpyruvate (PEP), the penultimate step in the conversion of glucose to pyruvate. More specifically, 2PG can be generated from Glycerate-3-phosphate via phosphoglycerate mutase or from phosphoenolpyrvate via alpha enolase.
Adenylsuccinic acid, also known as adenylosuccinate, succinyladenosine or aspartyl adenylate, belongs to the class of organic compounds known as purine ribonucleoside monophosphates. These are nucleotides consisting of a purine base linked to a ribose to which one monophosphate group is attached. Adenylsuccinic acid is found in all living organisms, ranging from bacteria to plants to animals. Adenylsuccinic acid is an important intermediate in the de novo purine biosynthesis pathway.  Specifically, adenylsuccinic acid is an intermediate in the interconversion of purine nucleotides inosine monophosphate (IMP) and adenosine monophosphate (AMP). The enzyme adenylosuccinate synthase carries out the reaction by the addition of aspartate to IMP. This reaction requires the input of energy from a phosphoanhydride bond in the form of guanosine triphosphate (GTP). Adenylsuccinic acid is a substrate least one other important metabolic reaction in purine biosynthesis. In particular, adenylsuccinic acid can be converted into fumaric acid through its interaction with the enzyme known as adenylosuccinate lyase (or adenylosuccinase). Adenylosuccinate lyase deficiency, is a rare autosomal recessive metabolic disorder characterized by the appearance of succinylaminoimidazolecarboxamide riboside (SAICA riboside) and adenylsuccinic acid in cerebrospinal fluid and urine (PMID: 8412002). Adenylosuccinate lyase deficiency presents with varying degrees of psychomotor retardation, autism, muscle wasting, and epilepsy. The exact cause of the symptoms is unknown, but possibilities include not enough purine nucleotide synthesis for cell replication, malfunctioning of the purine nucleotide cycle, and a buildup of substrates to toxic levels.
Cytidine 5'-monophosphate-N-acetylneuraminic acid (CMP-Neu5Ac), also known as CMP-N-acetyl-β-neuraminic acid, belongs to the class of organic compounds known as pyrimidine nucleotide sugars. These are pyrimidine nucleotides bound to a saccharide derivative through the terminal phosphate group. CMP-Neu5Ac is an extremely weak basic (essentially neutral) compound (based on its pKa). CMP-Neu5Ac donates N-acetylneuraminic acid to the terminal sugar of a ganglioside or glycoprotein.
Deoxyadenosine is a derivative of the nucleoside adenosine. It is composed of adenine attached to a deoxyribose moiety via a N9-glycosidic bond. Deoxyribose differs from ribose by the absence of oxygen in the 3' position of its ribose ring. Deoxyadenosine is a critical component of DNA. When present in sufficiently high levels, deoxyadensoine can act as an immunotoxin and a metabotoxin. An immunotoxin disrupts, limits the function, or destroys immune cells. A metabotoxin is an endogenous metabolite that causes adverse health effects at chronically high levels. Chronically high levels of deoxyadenosine are associated with adenosine deaminase (ADA) deficiency, an inborn error of metabolism. ADA deficiency damages the immune system and causes severe combined immunodeficiency (SCID). People with SCID lack virtually all immune protection from bacteria, viruses, and fungi. They are prone to repeated and persistent infections that can be very serious or life-threatening. These infections are often caused by "opportunistic" organisms that ordinarily do not cause illness in people with a normal immune system. The main symptoms of ADA deficiency are pneumonia, chronic diarrhea, and widespread skin rashes. The mechanism by which dATP functions as an immunotoxin is as follows: because deoxyadenosine is a precursor to dATP, a buildup of dATP in cells inhibits ribonucleotide reductase and prevents DNA synthesis, so cells are unable to divide. Since developing T cells and B cells are some of the most mitotically active cells, they are unable to divide and propagate to respond to immune challenges. High levels of deoxyadenosine also lead to an increase in S-adenosylhomocysteine, which is toxic to immature lymphocytes.
Deoxycytidine monophosphate (dCMP), also known as deoxycytidylic acid or deoxycytidylate in its conjugate acid and conjugate base forms, respectively, is a deoxynucleotide, and one of the four monomers that make up DNA. In a DNA double helix, it will base pair with deoxyguanosine monophosphate. dCMP belongs to the class of organic compounds known as pyrimidine 2'-deoxyribonucleoside monophosphates. These are pyrimidine nucleotides with a monophosphate group linked to the ribose moiety lacking a hydroxyl group at position 2. Deficiency of the enzyme deoxycytidine kinase (EC2.7.1.74) is associated with resistance to antiviral and anticancer chemotherapeutic agents, whereas increased enzyme activity is associated with increased activation of these compounds to cytotoxic nucleoside triphosphate derivatives. dCMP exists in all living species, ranging from bacteria to humans. Within humans, dCMP participates in a number of enzymatic reactions. In particular, dCMP can be converted to dCDP by the enzyme UMP-CMP kinase 2. In addition, dCMP can be converted into deoxycytidine, which is catalyzed by the enzyme cytosolic purine 5'-nucleotidase. In humans, dCMP is involved in the metabolic disorder called ump synthase deficiency (orotic aciduria). Outside of the human body, dCMP has been detected, but not quantified in several different foods, such as turnips, garlics, agaves, garden onions, and italian sweet red peppers. dCMP is a deoxycytosine nucleotide containing one phosphate group esterified to the deoxyribose moiety in the 2'-,3'- or 5- positions.