Sphingosine 1-phosphate (S1P), also known as sphing-4-enine-1-phosphate, is classified as a member of the phosphosphingolipids. Phosphosphingolipids are sphingolipids with a structure based on a sphingoid base that is attached to a phosphate head group. They differ from phosphonospingolipids which have a phosphonate head group. S1P is a compound with potent bioactive actions in sphingolipid metabolism, the calcium signalling pathway, and neuroactive ligand-receptor interaction. Generated by sphingosine kinases and ceramide kinase, S1P control numerous aspects of cell physiology, including cell survival and mammalian inflammatory responses. S1P is involved in cyclooxygenase-2 induction (COX-2) and regulates the production of eicosanoids (important inflammatory mediators). S1P functions mainly via G-protein-coupled receptors and probably also has intracellular targets (PMID: 16219683). S1P is considered to be practically insoluble (in water) and acidic.
Ceramides, also known as N-acylsphingosines, consist of a sphingoid base linked to a fatty acid chain via the amine group. Ceramides are one of the hydrolysis byproducts of sphingomyelin via the enzyme sphingomyelinase (sphingomyelin phosphorylcholine phosphohydrolase, EC 3.1.4.12) which has been identified in the subcellular fractions of human epidermis and many other tissues (PMID: 25935). They can also be synthesized from serine and palmitate in a de novo pathway and are regarded as important cellular signals for inducing apoptosis (PMID: 14998372). Ceramides are key to the biosynthesis of glycosphingolipids and gangliosides. Cer(d18:1/17:0), in particular, consists of a monounsaturated 18-carbon dihydroxylated sphingoid base linked to one chain of heptadecanoic acid.
Glycerol triheptadecanoate is a probable constituent of fat
Glycogen is a highly-branched polymer of about 30,000 glucose residues. The simplest structure of glycogen is made up of four units of glucose with an approximate molecular weight of 666 daltons. However, large molecules of glycogen can reach molecular weights in the order of 5 million Da. Most of the glucose units are linked together by alpha-1,4 glycosidic bonds, and approximately 1 in 12 glucose residues also form a 1,6 glycosidic bond with a second glucose, resulting in the creation of a branch. Glycogen only has one reducing end and a large number of non-reducing ends with a free hydroxyl group at carbon 4. The glycogen granules contain both glycogen and the enzymes of glycogen synthesis (glycogenesis) and degradation (glycogenolysis). The enzymes are nested between the outer branches of the glycogen molecules and act on the non-reducing ends. Therefore, the many non-reducing end-branches of glycogen facilitate its rapid synthesis and breakdown. In hypoglycemia caused by excessive insulin, liver glycogen levels are high, but the high insulin level prevents the necessary glycogenolysis to take place to maintain normal blood sugar levels. Glucagon is a common treatment for this type of hypoglycemia. Glycogen is a polysaccharide that is the principal storage form of glucose (Glc) in animal cells. Glycogen is found in the form of granules in the cytosol in many cell types. Hepatocytes (liver cells) have the highest concentration of it - up to 8% of the fresh weight in well fed state, or 100 to 120 g in an adult - giving liver a distinctive, 'starchy taste'. In the muscles, glycogen is found in a much lower concentration (1% of the muscle mass), but the total amount exceeds that in liver. Small amounts of glycogen are found in the kidneys, and even smaller amounts in certain glial cells in the brain and white blood cells.
Choline is a basic constituent of lecithin that is found in many plants and animal organs. It is important as a precursor of acetylcholine, as a methyl donor in various metabolic processes, and in lipid metabolism. Choline is now considered to be an essential vitamin. While humans can synthesize small amounts (by converting phosphatidylethanolamine to phosphatidylcholine), it must be consumed in the diet to maintain health. Required levels are between 425 mg/day (female) and 550 mg/day (male). Milk, eggs, liver, and peanuts are especially rich in choline. Most choline is found in phospholipids, namely phosphatidylcholine or lecithin. Choline can be oxidized to form betaine, which is a methyl source for many reactions (i.e. conversion of homocysteine into methionine). Lack of sufficient amounts of choline in the diet can lead to a fatty liver condition and general liver damage. This arises from the lack of VLDL, which is necessary to transport fats away from the liver. Choline deficiency also leads to elevated serum levels of alanine amino transferase and is associated with increased incidence of liver cancer.
Caprylic acid, or octanoic acid, with the structural formula CH3(CH2)6CO2H, is an eight-carbon straight-chain fatty acid and a carboxylic acid. It is an oily Liquid with a slightly unpleasant rancid taste and odor. It is minimally soluble in water. Caprylic acid can be found in numerous foods such as Prunus (Cherry, Plum), pineapple sages, black raspberries, shallots, coconuts and breast milk. Caprylic acid is taken as a dietary supplement. Caprylic acid is used commercially in the production of esters used in perfumery and in the manufacture of dyes. Caprylic acid is an antimicrobial pesticide used as a food contact surface sanitizer on dairy equipment, food processing equipment, breweries, wineries, and beverage processing plants. It is also used as disinfectant in health care facilities, schools/colleges, industrial facilities, recreational facilities, retail and wholesale establishments, livestock premises, restaurants, and hotels/motels. In addition, caprylic acid is used as an algicide, bactericide, fungicide, and herbicide in greenhouses and garden centers. Caprylic acid, and other fatty acids, affect the hunger hormone ghrelin. Ghrelin must be acylated, where it acquires an -OH group, before it can stimulate the hunger receptors in the hypothalamus. Caprylic acid becomes linked post-translationally to serine at the 3-position by the enzyme ghrelin O-acyltransferase (GOAT), located on the cell membrane of ghrelin cells in the stomach and pancreas (PMID 19896496). Caprylic acid affects those with medium-chain acyl-CoA dehydrogenase deficiency (MCAD), which is an inborn error of metabolism, marked by mutations of the gene ACADM. Those affected with MCAD have difficulties converting fatty acids to energy, especially during fasting. As a result, fatty acids build up and cause damage to liver and brain (PMID: 27536022).
Tryptamine, also known as TrpN, is a catabolite of tryptophan converted by the gut microbiota. After absorption through the intestinal epithelium, tryptophan catabolites enter the bloodstream and are later excreted in the urine. Both Clostridium sp. and Ruminococcus sp. have been found to convert tryptophan into tryptamine (PMID: 30120222). Tryptamine is a monoamine compound that is a common precursor molecule to many hormones and neurotransmitters. Biosynthesis generally proceeds from the amino acid tryptophan, with tryptamine acting as a precursor for other compounds. Substitutions to the tryptamine molecule give rise to a group of compounds collectively known as tryptamines. The most well-known tryptamines are serotonin, an important neurotransmitter, and melatonin, a hormone involved in regulating the sleep-wake cycle. Tryptamine has been detected, but not quantified in, several different foods, such as onion-family vegetables, acerola, Japanese walnuts, custard apples, and green zucchinis. This could make tryptamine a potential biomarker for the consumption of these foods.
(alpha-D-mannosyl)7-beta-D-mannosyl-diacetylchitobiosyl-L-asparagine, isoform A (protein), also known as ALA or 2-Aminopropanoic acid, is classified as an alanine or an Alanine derivative. Alanines are compounds containing alanine or a derivative thereof resulting from reaction of alanine at the amino group or the carboxy group, or from the replacement of any hydrogen of glycine by a heteroatom. (alpha-D-mannosyl)7-beta-D-mannosyl-diacetylchitobiosyl-L-asparagine, isoform A (protein) is considered to be soluble (in water) and acidic.  (alpha-D-mannosyl)7-beta-D-mannosyl-diacetylchitobiosyl-L-asparagine, isoform A (protein) can be synthesized from propionic acid. (alpha-D-mannosyl)7-beta-D-mannosyl-diacetylchitobiosyl-L-asparagine, isoform A (protein) can be synthesized into alanine derivative.  (alpha-D-mannosyl)7-beta-D-mannosyl-diacetylchitobiosyl-L-asparagine, isoform A (protein) is an odorless tasting compound found in Green bell peppers, Green zucchinis, Italian sweet red peppers, and Red bell peppers
Pyruvic acid or pyruvate is a simple alpha-keto acid. It is a three-carbon molecule containing a carboxylic acid group and a ketone functional group. Pyruvate is the simplest alpha-keto acid and according to official nomenclature by IUPAC, it is called alpha-keto propanoic acid. Like other keto acids, pyruvic acid can tautomerize from its ketone form to its enol form, containing a double bond and an alcohol. Pyruvate is found in all living organisms ranging from bacteria to plants to humans. It is intermediate compound in the metabolism of carbohydrates, proteins, and fats. Pyruvate is a key intermediate in several metabolic pathways throughout the cell. In particular, pyruvic acid can be made from glucose through glycolysis, converted back to carbohydrates (such as glucose) via gluconeogenesis, or to fatty acids through a reaction with acetyl-CoA. Pyruvic acid supplies energy to cells through the citric acid cycle (TCA or Krebs cycle) when oxygen is present (aerobic respiration), and alternatively ferments to produce lactate when oxygen is lacking (lactic acid). In glycolysis, phosphoenolpyruvate (PEP) is converted to pyruvate by pyruvate kinase. This reaction is strongly exergonic and irreversible. In gluconeogenesis, it takes two enzymes, pyruvate carboxylase and PEP carboxykinase, to catalyze the reverse transformation of pyruvate to PEP. Pyruvic acid is also a metabolite of Corynebacterium (PMID: 27872963).
Ketoleucine is an abnormal metabolite that arises from the incomplete breakdown of branched-chain amino acids. Ketoleucine is both 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 ketoleucine are associated with maple syrup urine disease (MSUD). MSUD is a metabolic disorder caused by a deficiency of the branched-chain alpha-keto acid dehydrogenase complex (BCKDC), leading to a buildup of the branched-chain amino acids (leucine, isoleucine, and valine) and their toxic by-products (ketoacids) in the blood and urine. The symptoms of MSUD often show in infancy and lead to severe brain damage if untreated. MSUD may also present later depending on the severity of the disease. If left untreated in older individuals, during times of metabolic crisis, symptoms of the condition include uncharacteristically inappropriate, extreme, or erratic behaviour and moods, hallucinations, anorexia, weight loss, anemia, diarrhea, vomiting, dehydration, lethargy, oscillating hypertonia and hypotonia, ataxia, seizures, hypoglycemia, ketoacidosis, opisthotonus, pancreatitis, rapid neurological decline, and coma.  In maple syrup urine disease, the brain concentration of branched-chain ketoacids can increase 10- to 20-fold. This leads to a depletion of glutamate and a consequent reduction in the concentration of brain glutamine, aspartate, alanine, and other amino acids. The result is a compromise of energy metabolism because of a failure of the malate-aspartate shuttle and a diminished rate of protein synthesis (PMID: 15930465).
Glycerol or glycerin is a colourless, odourless, viscous liquid that is sweet-tasting and mostly non-toxic. It is widely used in the food industry as a sweetener and humectant and in pharmaceutical formulations. Glycerol is an important component of triglycerides (i.e. fats and oils) and of phospholipids. Glycerol is a three-carbon substance that forms the backbone of fatty acids in fats. When the body uses stored fat as a source of energy, glycerol and fatty acids are released into the bloodstream. The glycerol component can be converted into glucose by the liver and provides energy for cellular metabolism. Normally, glycerol shows very little acute toxicity and very high oral doses or acute exposures can be tolerated. On the other hand, chronically high levels of glycerol in the blood are associated with glycerol kinase deficiency (GKD). GKD causes the condition known as hyperglycerolemia, an accumulation of glycerol in the blood and urine. There are three clinically distinct forms of GKD: infantile, juvenile, and adult. The infantile form is the most severe and is associated with vomiting, lethargy, severe developmental delay, and adrenal insufficiency. The mechanisms of glycerol toxicity in infants are not known, but it appears to shift metabolism towards chronic 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 untreated GKD. Many affected children with organic acidemias experience intellectual disability or delayed development. Patients with the adult form of GKD generally have no symptoms and are often detected fortuitously.
(2E)-Decenoyl-ACP, also known as Cycloleucine or 1-Aminocyclopentanecarboxylic acid, is classified as a member of the L-alpha-amino acids. L-alpha-amino acids are alpha amino acids which have the L-configuration of the alpha-carbon atom. (2E)-Decenoyl-ACP is considered to be soluble (in water) and acidic
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).
Pipecolic acid is a metabolite of lysine found in human physiological fluids such as urine, plasma and CSF. However, it is uncertain if pipecolic acid originates directly from food intake or from mammalian or intestinal bacterial enzyme metabolism. Recent studies suggest that plasma pipecolic acid, particularly the D-isomer, originates mainly from the catabolism of dietary lysine by intestinal bacteria rather than by direct food intake. In classic Zellweger syndrome (a cerebro-hepato-renal genetic disorder, OMIM 214100) pipecolic acid accumulate in the plasma of the patients. It is known that plasma pipecolic acid levels are also elevated in patients with chronic liver diseases. Pipecolic acid is moderately elevated in patients with pyridoxine-dependent seizures and might therefore be a possible biochemical marker for selecting candidates for pyridoxine therapy (Plecko et al 2000). Pipecolic acid was also elevated in CSF in these vitamin B6-responsive patients (PMID 12705501). Pipecolic acid is found to be associated with adrenoleukodystrophy, infantile Refsum disease, and peroxisomal biogenesis defect, which are also inborn errors of metabolism. Pipecolic acid is a biomarker for the consumption of dried and cooked beans.
Malic acid (CAS: 6915-15-7) is a tart-tasting organic dicarboxylic acid that plays a role in many sour or tart foods. Apples contain malic acid, which contributes to the sourness of a green apple. Malic acid can make a wine taste tart, although the amount decreases with increasing fruit ripeness (Wikipedia). In its ionized form, malic acid is called malate. Malate is an intermediate of the TCA cycle along with fumarate. It can also be formed from pyruvate as one of the anaplerotic reactions. In humans, malic acid is both derived from food sources and synthesized in the body through the citric acid cycle or Krebs cycle which takes place in the mitochondria. Malate's importance to the production of energy in the body during both aerobic and anaerobic conditions is well established. Under aerobic conditions, the oxidation of malate to oxaloacetate provides reducing equivalents to the mitochondria through the malate-aspartate redox shuttle. During anaerobic conditions, where a buildup of excess reducing equivalents inhibits glycolysis, malic acid's simultaneous reduction to succinate and oxidation to oxaloacetate is capable of removing the accumulating reducing equivalents. This allows malic acid to reverse hypoxia's inhibition of glycolysis and energy production. In studies on rats, it has been found that only tissue malate is depleted following exhaustive physical activity. Other key metabolites from the citric acid cycle needed for energy production were found to be unchanged. Because of this, a deficiency of malic acid has been hypothesized to be a major cause of physical exhaustion. Notably, the administration of malic acid to rats has been shown to elevate mitochondrial malate and increase mitochondrial respiration and energy production. Malic acid has been found to be a metabolite in Aspergillus (Hugo Vanden Bossche, D.W.R. Mackenzie and G. Cauwenbergh. Aspergillus and Aspergillosis, 1987).
A-Ketoglutaric acid oxime, also known as a-ketoglutarate oxime or 2-oxime-(8ci)-2-oxoglutarate, belongs to the class of organic compounds known as dicarboxylic acids and derivatives. These are organic compounds containing exactly two carboxylic acid groups.
Racemethionine, also known as DL-methionine or hmet, belongs to the class of organic compounds known as methionine and derivatives. Methionine and derivatives are compounds containing methionine or a derivative thereof resulting from reaction of methionine at the amino group or the carboxy group, or from the replacement of any hydrogen of glycine by a heteroatom. Methionine is an alpha-amino acid with the chemical formula HO2CCH(NH2)CH2CH2SCH3. This essential amino acid is classified as nonpolar. Racemethionine exists in all living organisms, ranging from bacteria to humans. Racemethionine is a mild, acidic, and sulfurous tasting compound. Racemethionine is found, on average, in the highest concentration within a few different foods, such as wheats, oats, and ryes and in a lower concentration in spinachs, white cabbages, and green zucchinis. Racemethionine is used as a flavouring ingredient and dietary supplement.
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.
Creatinine, or creatine anhydride, is a breakdown product of creatine phosphate in muscle. The loss of a water molecule from creatine results in the formation of creatinine. Creatinine is transferred to the kidneys by blood plasma, whereupon it is eliminated from the body by glomerular filtration and partial tubular excretion. Creatinine is usually produced at a fairly constant rate by the body. Measuring serum creatinine is a simple test and it is the most commonly used indicator of renal function. A rise in blood creatinine levels is observed only with marked damage to functioning nephrons. Therefore, this test is not suitable for detecting early kidney disease. The typical reference range for women is considered about 45-90 µmol/L; for men 60-110 µmol/L. Creatine and creatinine are metabolized in the kidneys, muscle, liver, and pancreas.
Erythronic acid is a sugar component of aqueous humour (eye). It may be derived from glycated proteins or from degradation of ascorbic acid. Erythronic acid is a normal organic acid present in a healthy adult and pediatric population. It has been found in urine, plasma, CSF, and synovial fluid (PMID: 14708889, 8087979, 8376520, 10420182). Erythronic acid is formed when N-acetyl-D-glucosamine (GlcNAc) is oxidized. GlcNAc is a constituent of hyaluronic acid (HA), a polysaccharide consisting of alternating units of glucuronic acid and GlcNAc, present as an aqueous solution in synovial fluid. In the synovial fluid of patients suffering from rheumatoid arthritis, HA is thought to be degraded either by radicals generated by Fenton chemistry (Fe2+/H2O2) or by NaOCl generated by myeloperoxidase (PMID: 10614067).
DL-Glutamate, also known as E or DL-glutamic acid, belongs to the class of organic compounds known as glutamic acid and derivatives. Glutamic acid and derivatives 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. These are amino acids in which the amino group is attached to the carbon atom immediately adjacent to the carboxylate group (alpha carbon). DL-Glutamate exists in all living organisms, ranging from bacteria to humans. DL-Glutamate is found, on average, in the highest concentration within a few different foods, such as red bell peppers, milk (cow), and wheats and in a lower concentration in eggplants, romaine lettuces, and nanking cherries. DL-Glutamate has also been detected, but not quantified, in a few different foods, such as apples, broccoli, and lettuces.
Aminoadipic acid, also known as a-aminoadipate or Aad, 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). Aminoadipic acid is a very hydrophobic molecule, practically insoluble (in water), and relatively neutral. Aminoadipic acid exists in all eukaryotes, ranging from yeast to humans. Within humans, aminoadipic acid participates in a number of enzymatic reactions. In particular, aminoadipic acid can be biosynthesized from allysine; which is mediated by the enzyme Alpha-aminoadipic semialdehyde dehydrogenase. In addition, aminoadipic acid and oxoglutaric acid can be converted into oxoadipic acid and L-glutamic acid; which is catalyzed by the enzyme kynurenine/alpha-aminoadipate aminotransferase, mitochondrial. In humans, aminoadipic acid is involved in the metabolic disorder called 2-aminoadipic 2-oxoadipic aciduria. Outside of the human body, Aminoadipic acid is found, on average, in the highest concentration within a few different foods, such as wheats, milk (cow), and ryes and in a lower concentration in dills, garden onions, and white cabbages. Aminoadipic acid has also been detected, but not quantified in, several different foods, such as barley, cow milks, cow milks, cow milks, and cow milks. This could make aminoadipic acid a potential biomarker for the consumption of these foods. Aminoadipic acid is a potentially toxic compound. Aminoadipic acid, with regard to humans, has been found to be associated with several diseases such as alpha-aminoadipic and alpha-ketoadipic aciduria, colorectal cancer, metastatic melanoma, and eosinophilic esophagitis; aminoadipic acid has also been linked to the inborn metabolic disorder 2-ketoadipic acidemia.
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.
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.
Glycerol 3-phosphate is a chemical intermediate in the glycolysis metabolic pathway. It is commonly confused with the similarly named glycerate 3-phosphate or glyceraldehyde 3-phosphate. Glycerol 3-phosphate is produced from glycerol, the triose sugar backbone of triglycerides and glycerophospholipids, by the enzyme glycerol kinase. Glycerol 3-phospate may then be converted by dehydrogenation to dihydroxyacetone phosphate (DHAP) by the enzyme glycerol-3-phosphate dehydrogenase. DHAP can then be rearranged into glyceraldehyde 3-phosphate (GA3P) by triose phosphate isomerase (TIM), and feed into glycolysis. The glycerol 3-phosphate shuttle is used to rapidly regenerate NAD+ in the brain and skeletal muscle cells of mammals (wikipedia).
Pseudouridine, also known as psi-uridine or 5-ribosyluracil, belongs to the class of organic compounds known as nucleoside and nucleotide analogues. These are analogues of nucleosides and nucleotides, such as phosphonated nucleosides, C-glycosylated nucleoside bases, analogues where the sugar unit is a pyranose, and carbocyclic nucleosides.  Pseudouridine specifically has its uracil attached via a carbon-carbon instead of a nitrogen-carbon glycosidic bond to the ribofuranose.  It is the most prevalent of the over one hundred different modified nucleosides found in RNA (PMID: 17113994).  Pseudouridine is a solid that is soluble in water.  Pseudouridine exists in all living species, ranging from bacteria to humans, and is in all classes of RNA except mRNA.  It is formed by enzymes called pseudouridine synthases, which post-transcriptionally isomerize specific uridine residues in RNA.
Allysine (CAS: 1962-83-0), also known as 2-amino-6-oxohexanoic acid or 6-oxonorleucine, 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). Outside of the human body, allysine has been detected, but not quantified in, several different foods, such as winged beans, wasabi, common verbena, arrowhead, and oats. This could make allysine a potential biomarker for the consumption of these foods. Allysine is a derivative of lysine used in the production of elastin and collagen. It is produced by the actions of the enzyme lysyl oxidase in the extracellular matrix and is essential in the crosslink formation that stabilizes collagen and elastin.
Cysteinylglycine is a naturally occurring dipeptide composed of cysteine and glycine. It is derived from the breakdown of glutathione (a tripeptide). In plasma, cysteinylglycine is in a reduced, oxidized, and protein-bound form (aminothiol) and interacts via redox and disulphide exchange reactions in a dynamic system referred to as redox thiol status (PMID: 8642471). Spermatozoa of sub-fertile men contain significantly higher thiol concentrations as compared with those of fertile men. The detrimental effect on embryo quality of a high homocysteine (Hcy) concentration in the ejaculate and in the follicular fluid is intriguing and may suggest that Hcy is inversely associated with fertility outcome (PMID: 16556671). Rheumatoid arthritis (RA) is a chronic inflammatory disease which involves the synovial membrane of multiple diarthroidal joints causing damage to cartilage and bones. The damage process seems to be related to an overproduction of oxygen reactive species inducing an oxidative perturbation with an increase in some oxidized forms (disulfides and protein mixed disulfides) and a decrease in free thiols (PMID: 15895891). Imipenem (thienamycin formamidine) is a broad-spectrum beta-lactam antibiotic, always used in combination with cilastatin in order to avoid the premature breakdown of imipenem by renal tubular dipeptidase. As this dipeptidase also hydrolyzes the glutathione metabolite cysteinylglycine, the therapeutic association of imipenem and cilastatin causes plasma levels of cysteinylglycine to increase significantly, while cysteine levels are decreased and homocysteine levels are unaffected. Therefore, antibiotic treatment using imipenem-cilastatin induces important metabolic changes that should not remain unrecognized (PMID: 15843241).
Hippuric acid is an acyl glycine formed from the conjugation of benzoic acid with glycine. 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. Hippuric acid is a normal component of urine and is typically increased with increased consumption of phenolic compounds (tea, wine, fruit juices). These phenols are converted into benzoic acid which is then converted into hippuric acid and excreted in the urine. Hippuric acid is the most frequently used biomarker in the biological monitoring of occupational exposure to toluene. This product of solvent biotransformation may be also found in the urine of individuals who have not been exposed to the solvent. A smaller fraction of the absorbed toluene is oxidized into aromatic compounds including ortho-cresol, which is not found in the urine of nonexposed individuals in a significant amount. The concentration of hippuric acid in the urine of individuals exposed to a low toluene concentration does not differ from that of individuals not exposed to the solvent. This has led to the conclusion that hippuric acid should not be utilized in the biological monitoring of occupational exposure to low levels of toluene in the air. Protein-bound organic acids such as hippuric acid are markedly accumulated in uremic plasma and produce defective protein binding of drugs (PMID: 9120876 , 8734460). Hippuric acid has been identified as a uremic toxin according to the European Uremic Toxin Working Group (PMID: 22626821). Hippuric acid is also found to be associated with phenylketonuria, propionic acidemia, and tyrosinemia I, which are inborn errors of metabolism. Hippuric acid is an endogenous phenolic acid metabolite detected after the consumption of whole grain.
NAD (or nicotinamide adenine dinucleotide) is used extensively in glycolysis and the citric acid cycle of cellular respiration. The reducing potential stored in NADH can be either converted into ATP through the electron transport chain or used for anabolic metabolism. ATP "energy" is necessary for an organism to live. Green plants obtain ATP through photosynthesis, while other organisms obtain it via cellular respiration (Wikipedia). NAD is a coenzyme composed of ribosylnicotinamide 5'-diphosphate coupled to adenosine 5'-phosphate by a pyrophosphate linkage. It is found widely in nature and is involved in numerous enzymatic reactions in which it serves as an electron carrier by being alternately oxidized (NAD+) and reduced (NADH) (Dorland, 27th ed).
Nicotinamide adenine dinucleotide (NAD) is a coenzyme central to metabolism. Found in all living cells, NAD is called a dinucleotide because it consists of two nucleotides joined through their phosphate groups. One nucleotide contains an adenine nucleobase and the other nicotinamide. NAD exists in two forms: an oxidized and reduced form, abbreviated as NAD+ and NADH (H for hydrogen) respectively. NADH is the reduced form of NAD+, and NAD+ is the oxidized form of NADH. NAD (or nicotinamide adenine dinucleotide) is used extensively in glycolysis and the citric acid cycle of cellular respiration. The reducing potential stored in NADH can be either converted into ATP through the electron transport chain or used for anabolic metabolism. ATP "energy" is necessary for an organism to live. Green plants obtain ATP through photosynthesis, while other organisms obtain it via cellular respiration. NAD is a coenzyme composed of ribosylnicotinamide 5'-diphosphate coupled to adenosine 5'-phosphate by a pyrophosphate linkage. It is found widely in nature and is involved in numerous enzymatic reactions in which it serves as an electron carrier by being alternately oxidized (NAD+) and reduced (NADH). NADP is formed through the addition of a phosphate group to the 2' position of the adenosyl nucleotide through an ester linkage.
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])
The anion, the salts, and the esters of pyrophosphoric acid are called pyrophosphates. The pyrophosphate anion is abbreviated PPi and is formed by the hydrolysis of ATP into AMP in cells. This hydrolysis is called pyrophosphorolysis. The pyrophosphate anion has the structure P2O74-, and is an acid anhydride of phosphate. It is unstable in aqueous solution and rapidly hydrolyzes into inorganic phosphate. Pyrophosphate is an osteotoxin (arrests bone development) and an arthritogen (promotes arthritis). It is also a metabotoxin (an endogenously produced metabolite that causes adverse health affects at chronically high levels). Chronically high levels of pyrophosphate are associated with hypophosphatasia. Hypophosphatasia (also called deficiency of alkaline phosphatase or phosphoethanolaminuria) is a rare, and sometimes fatal, metabolic bone disease. Hypophosphatasia is associated with a molecular defect in the gene encoding tissue non-specific alkaline phosphatase (TNSALP). TNSALP is an enzyme that is tethered to the outer surface of osteoblasts and chondrocytes. TNSALP hydrolyzes several substances, including inorganic pyrophosphate (PPi) and pyridoxal 5'-phosphate (PLP), a major form of vitamin B6. When TSNALP is low, inorganic pyrophosphate (PPi) accumulates outside of cells and inhibits the formation of hydroxyapatite, one of the main components of bone, causing rickets in infants and children and osteomalacia (soft bones) in adults. Vitamin B6 must be dephosphorylated by TNSALP before it can cross the cell membrane. Vitamin B6 deficiency in the brain impairs synthesis of neurotransmitters which can cause seizures. In some cases, a build-up of calcium pyrophosphate dihydrate crystals in the joints can cause pseudogout.
Adenosine monophosphate, also known as 5'-adenylic acid and abbreviated AMP, is a nucleotide that is found in RNA. It is an ester of phosphoric acid with the nucleoside adenosine. AMP consists of the phosphate group, the pentose sugar ribose, and the nucleobase adenine. AMP can be produced during ATP synthesis by the enzyme adenylate kinase. AMP has recently been approved as a 'Bitter Blocker' additive to foodstuffs. When AMP is added to bitter foods or foods with a bitter aftertaste it makes them seem 'sweeter'. This potentially makes lower calorie food products more palatable.
Adenosine diphosphate (ADP), also known as adenosine pyrophosphate (APP), is an important organic compound in metabolism and is essential to the flow of energy in living cells. ADP consists of three important structural components: a sugar backbone attached to adenine and two phosphate groups bonded to the 5 carbon atom of ribose. The diphosphate group of ADP is attached to the 5’ carbon of the sugar backbone, while the adenine attaches to the 1’ carbon. ADP belongs to the class of organic compounds known as purine ribonucleoside diphosphates. These are purine ribobucleotides with diphosphate group linked to the ribose moiety. It is an ester of pyrophosphoric acid with the nucleotide adenine. Adenosine diphosphate is a nucleotide. ADP exists in all living species, ranging from bacteria to humans. In humans, ADP is involved in d4-gdi signaling pathway. ADP is the product of ATP dephosphorylation by ATPases. ADP is converted back to ATP by ATP synthases. ADP consists of the pyrophosphate group, the pentose sugar ribose, and the nucleobase adenine.
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.
Nadp+, also known as nicotinamide adenine dinucleotide phosphate or nadp, is a member of the class of compounds known as (5'->5')-dinucleotides (5'->5')-dinucleotides are dinucleotides where the two bases are connected via a (5'->5')-phosphodiester linkage. Nadp+ is slightly soluble (in water) and an extremely strong acidic compound (based on its pKa). Nadp+ can be found in a number of food items such as small-leaf linden, redcurrant, root vegetables, and fenugreek, which makes nadp+ a potential biomarker for the consumption of these food products. Nadp+ can be found primarily in blood, as well as throughout all human tissues. Nadp+ exists in all eukaryotes, ranging from yeast to humans. In humans, nadp+ is involved in several metabolic pathways, some of which include folate malabsorption, hereditary, carprofen action pathway, valdecoxib action pathway, and glutathione metabolism. Nadp+ is also involved in several metabolic disorders, some of which include monoamine oxidase-a deficiency (MAO-A), apparent mineralocorticoid excess syndrome, hyperprolinemia type I, and hyperphenylalaninemia due to dhpr-deficiency. Moreover, nadp+ is found to be associated with pellagra. Nicotinamide adenine dinucleotide phosphate, abbreviated NADP+ or, in older notation, TPN (triphosphopyridine nucleotide), is a cofactor used in anabolic reactions, such as lipid and nucleic acid synthesis, which require NADPH as a reducing agent .
NADPH is the reduced form of NADP+, and NADP+ is the oxidized form of NADPH. 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).
Ubiquinone-2 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-2 has just 2 isoprene units. Normally in humans it has 10. Ubiquinone-2 is an intermediate in the synthesis of Ubiquionone 10. Ubiquionone is involved in cellular respiration. It is fat-soluble and is therefore mobile in cellular membranes; it plays a unique role in the electron transport chain (ETC). In the inner bacterial membrane, electrons from NADH and succinate pass through the ETC to the oxygen, which is then reduced to water. The transfer of electrons through ETC results in the pumping of H+ across the membrane creating a proton gradient across the membrane, which is used by ATP synthase (located on the membrane) to generate ATP.
Succinyl-CoA is an important intermediate in the citric acid cycle, where it is synthesized from &#945;-Ketoglutarate by &#945;-ketoglutarate dehydrogenase (EC 1.2.4.2) through decarboxylation, and is converted into succinate through the hydrolytic release of coenzyme A by succinyl-CoA synthetase (EC 6.2.1.5). Succinyl-CoA may be an end product of peroxisomal beta-oxidation of dicarboxylic fatty acids; the identification of an apparently specific succinyl-CoA thioesterase (ACOT4, EC 3.1.2.3, hydrolyzes succinyl-CoA) in peroxisomes strongly suggests that succinyl-CoA is formed in peroxisomes. 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, thereby regulating levels of these compounds. (PMID: 16141203).
Nicotinic acid adenine dinucleotide, also known as deamido-NAD or NAAD, belongs to the class of organic compounds known as (5'->5')-dinucleotides. These are dinucleotides where the two bases are connected via a (5'->5')-phosphodiester linkage. NAAD is possibly soluble (in water) and a strong basic compound (based on its pKa). NAAD exists in all living species, ranging from bacteria to humans. L-Glutamine and NAAD can be converted into L-glutamic acid and NAD; which is catalyzed by the enzyme glutamine-dependent nad(+) synthetase. In humans, NAAD is involved in the nicotinate and nicotinamide metabolism pathway. NAAD is also involved in the metabolic disorder called succinic semialdehyde dehydrogenase deficiency. Outside of the human body, NAAD has been detected, but not quantified in, several different foods, such as japanese walnuts, cauliflowers, sparkleberries, komatsuna, and macadamia nut (m. tetraphylla). This could make NAAD a potential biomarker for the consumption of these foods. NAAD is the product of the degradation of Nicotinic acid adenine dinucleotide phosphate (NAADP) by a Ca2+-sensitive phosphatase. NAADP is a Ca2+-mobilizing second messenger which is synthesized, in response to extracellular stimuli, via the base-exchange reaction by an ADP-ribosyl cyclase (ARC) family members (such as CD38). NAADP binds to and opens Ca2+ channels on intracellular organelles, thereby increasing the intracellular Ca2+ concentration which, in turn, modulates a variety of cellular processes. Structurally, NAADP it is a dinucleotide that only differs from the house-keeping enzyme cofactor, NADP, by a hydroxyl group (replacing the nicotinamide amino group) and yet this minor modification converts it into the most potent Ca2+-mobilizing second messenger yet described. NAADP may also be broken down to 2-phosphoadenosine diphosphoribose (ADPRP) by CD38 or reduced to NAADPH.
S-Adenosylmethionine (CAS: 29908-03-0), also known as SAM or AdoMet, is a physiologic methyl radical donor involved in enzymatic transmethylation reactions and present in all living organisms. It possesses anti-inflammatory activity and has been used in the treatment of chronic liver disease (From Merck, 11th ed). S-Adenosylmethionine is a natural substance present in the cells of the body. It plays a crucial biochemical role by donating a one-carbon methyl group in a process called transmethylation. S-Adenosylmethionine, formed from the reaction of L-methionine and adenosine triphosphate catalyzed by the enzyme S-adenosylmethionine synthetase, is the methyl-group donor in the biosynthesis of both DNA and RNA nucleic acids, phospholipids, proteins, epinephrine, melatonin, creatine, and other molecules.
Guanosine diphosphate, also known as 5'-GDP or 5'-diphosphate, guanosine, belongs to the class of organic compounds known as purine ribonucleoside diphosphates. These are purine ribobucleotides with diphosphate group linked to the ribose moiety. Guanosine diphosphate exists in all living species, ranging from bacteria to humans. In humans, guanosine diphosphate is involved in intracellular signalling through adenosine receptor A2B and adenosine. Outside of the human body, Guanosine diphosphate has been detected, but not quantified in several different foods, such as devilfish, java plums, green beans, almonds, and orange mints. Guanosine diphosphate is a purine ribonucleoside 5'-diphosphate resulting from the formal condensation of the hydroxy group at the 5' position of guanosine with pyrophosphoric acid.
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).
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).
Dulciol B is a constituent of Garcinia dulcis (mundu)
Chalepin acetate is found in herbs and spices. Chalepin acetate is a constituent of Ruta graveolens (rue)
Dibenzyl disulfide is a flavouring ingredien
Coniferin (CAS: 531-29-3), also known as abietin or coniferoside, 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. Among the sugar units found in natural glycosides are D-glucose, L-fructose, and L-rhamnose. Coniferin is an extremely weak basic (essentially neutral) compound (based on its pKa). Coniferin is a  monosaccharide derivative consisting of coniferol attached to a beta-D-glucopyranosyl residue at position 1 via a glycosidic linkage. Coniferin is found in asparagus and has been isolated from Scorzonera hispanica (black salsify).
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.
1-Hydroxyepiacorone is found in herbs and spices. 1-Hydroxyepiacorone is a constituent of Acorus calamus (sweet flag)
Bisacurone A is found in beverages. Bisacurone A is a constituent of Curcuma xanthorrhiza (Java turmeric).
Pitheduloside J is found in fruits. Pitheduloside J is a constituent of Pithecellobium dulce (manila tamarind).
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.
Trimethylpyrazine, also known as fema 3244, 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. Trimethylpyrazine is a cocoa, earthy, and hazelnut tasting compound. trimethylpyrazine is found, on average, in the highest concentration in kohlrabis. trimethylpyrazine has also been detected, but not quantified, in several different foods, such as green vegetables, pepper (c. annuum), orange bell peppers, potato, and red bell peppers. This could make trimethylpyrazine a potential biomarker for the consumption of these foods. Found in many foodstuffs e.g. asparagus, baked potato, wheat bread, Swiss cheese, coffee, black tea, roasted filbert and peanut, and soybean.
Nonane is found in common oregano. Nonane is present in numerous plant oils including olive oils.Nonane is a linear alkane hydrocarbon with the chemical formula C9H20. Nonane has 35 structural isomers. (Wikipedia
1,3-Di-tert-butylbenzene belongs to the class of organic compounds known as phenylpropanes. These are organic compounds containing a phenylpropane moiety.
xi-4-Methyldecane is found in animal foods. Also isolated from aroma volatiles of chick pea (Cicer arietinum), coconut flesh (Cocos nucifera), cooked beef and wheat.
Tricin 7-glucoside is found in barley. Tricin 7-glucoside is isolated from rice leaves (Oryza sativa
Gamma glutamyl ornithine is found in human urine. - PubMed reference: 1148212. Gamma-glutamylornithine has been identified in urine from patients with the HHH syndrome (hyperornithinemia, hyperammonemia and homocitrullinuria) and with gyrate atrophy associated with hyperornithinemia. The amount of gamma-glutamylornithine excreted was 10-15 times higher than that excreted in normal subjects. - PubMed reference: 6547887.
Persicarin is a member of the class of compounds known as 3-sulfated flavonoids. 3-sulfated flavonoids are flavonoids that are sulfated at the 3-ring position of the flavonoid skeleton. Thus, persicarin is considered to be a flavonoid lipid molecule. Persicarin is practically insoluble (in water) and an extremely strong acidic compound (based on its pKa). Persicarin can be found in dill, which makes persicarin a potential biomarker for the consumption of this food product.
Phenylalanylphenylalanine (Phe-Phe) is a peptide made of two phenylalanine molecules. Phenylalanine is an essential amino acid and the precursor for the amino acid tyrosine. Like tyrosine, it is the precursor of catecholamines in the body (tyramine, dopamine, epinephrine and norepinephrine). The psychotropic drugs (mescaline, morphine, codeine, and papaverine) also have phenylalanine as a constituent. Phenylalanine is a precursor of the neurotransmitters called catecholamines, which are adrenalin-like substances. Phenylalanine is highly concentrated in the human brain and plasma. The Phe-Phe recognition motif of Alzheimer's amyloid-beta peptide is the smallest peptide able to assemble into higher-order structures (PMID: 17172307).
Castamollissin is found in nuts. Castamollissin is isolated from the leaves of Castanea mollissima (Chinese chestnut).
Isoleucyl-Isoleucine is a dipeptied compoosed of two isoleucine 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.
Isoferulic acid 3-sulfate is a polyphenol metabolite detected in biological fluids (PMID: 20428313).
1-Hydroxy-3,6,7-trimethoxy-2,8-diprenylxanthone is found in fruits. 1-Hydroxy-3,6,7-trimethoxy-2,8-diprenylxanthone is a constituent of Garcinia mangostana (mangosteen).
4,4-Dimethyl-14alpha-hydroxymethyl-5alpha-cholesta-8-en-3beta-ol is a 3-beta-hydroxysterol that is an intermediate in cholesterol biosynthesis. It is a substrate for lanosterol 14alpha-demethylase (CYP51A1) and can be generated from the enzymatic oxidation of 24,25-dihydrolanosteroland and from the enzymatic reduction of 4,4-dimethyl-14alpha-formyl-5alpha-cholesta-8-en-3beta-ol. The sequence of reactions and the types of intermediates in cholesterol biosynthesis may vary. Alternate routes exist because reduction of the carbon 24,25 double bond on the hydrocarbon side chain of the sterol ring structure by sterol delta24-reductase can occur at multiple points in the pathway, giving rise to different intermediates. These intermediates, with or without a double bond in the hydrocarbon side chain, can serve as substrates for the other enzymes in the pathway.
Ethyl beta-D-glucopyranoside is a constituent of Citrus peels, the fresh root cortex of Manihot esculenta (cassava), and other plant subspecies. Ethyl beta-D-glucopyranoside is found in many foods, some of which are root vegetables, citrus, alcoholic beverages, and fruits.
L,L-Cyclo(leucylprolyl) is found in alcoholic beverages. L,L-Cyclo(leucylprolyl) is produced by microorganisms and is a bitter component of sake and contributes to the flavour of beer.
Apigenin 7,4'-dimethyl ether, also known as apigenin dimethylether or 4',7-dimethylapigenin, belongs to the class of organic compounds known as 7-O-methylated flavonoids. These are flavonoids with methoxy groups attached to the C7 atom of the flavonoid backbone. Thus, apigenin 7,4'-dimethyl ether is considered to be a flavonoid lipid molecule. Apigenin 7,4'-dimethyl ether is a very hydrophobic molecule, practically insoluble (in water), and relatively neutral. Outside of the human body, apigenin 7,4'-dimethyl ether has been detected, but not quantified in, common sages and sweet basils. This could make apigenin 7,4'-dimethyl ether a potential biomarker for the consumption of these foods. BioTransformer predicts that apigenin 7,4'-dimethyl ether is a product of 4',5,7-trimethoxyflavone metabolism via an O-dealkylation reaction and catalyzed by CYP2C9 and CYP2C19 enzymes (PMID: 30612223).
Spathulenol is found in alcoholic beverages. Spathulenol is a constituent of Salvia sclarea (clary sage).
Allyl methyl sulfoxide is an odourless garlic-derived metabolite found in human breast milk and urine. It is likely the oxidation product of allyl methyl sulfide (AMS) otherwise known as 3-(methylthio)-1-propene.
Artocarpesin is found in fruits. Artocarpesin is a constituent of the heartwood of Artocarpus heterophyllus (jackfruit)
Hovenidulcioside B2 is a constituent of Hovenia dulcis (raisin tree).
Heneicosane, also known as CH3-[CH2]19-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, heneicosane is considered to be a hydrocarbon lipid molecule. Heneicosane is a very hydrophobic molecule, practically insoluble in water, and relatively neutral. Heneicosane is an alkane and waxy tasting compound. Heneicosane is found, on average, in the highest concentration within a few different foods, such as black elderberries, common oregano, and lemon balms. Heneicosane has also been detected, but not quantified, in several different foods, such as sunflowers, kohlrabis, orange bell peppers, lindens, and pepper (c. annuum). This could make heneicosane a potential biomarker for the consumption of these foods. An alkane that has 21 carbons and a straight-chain structure.
(+)-7-epi-Syringaresinol 4'-glucoside is found in tea. (+)-7-epi-Syringaresinol 4'-glucoside is a constituent of the roots of Eleutherococcus senticosus (Siberian ginseng).
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.
(6alpha,7alpha,10alpha)-1(5),3-Aromadendradiene is a constituent of Tolu balsam (Myroxylon balsamum var. balsamum). (6alpha,7alpha,10alpha)-1(5),3-Aromadendradiene is a flavouring agent
Alanylserine is a dipeptide composed of alanine 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.
Isorhamnetin is the methylated metabolite of quercetin. Quercetin is an important dietary flavonoid with in vitro antioxidant activity. However, it is found in human plasma as conjugates with glucuronic acid, sulfate or methyl groups, with no significant amounts of free quercetin present. Isorhamnetin prevents endothelial cell injuries from oxidized LDL via inhibition of lectin-like ox-LDL receptor-1 upregulation, interference of ox-LDL-mediated intracellular signaling pathway (p38MAPK activation, NF-kappaB nuclear translocation, eNOS expression) and the antioxidant activity of isorhamnetin. Isorhamnetin prevents endothelial dysfunction, superoxide production, and overexpression of p47phox induced by angiotensin II. Isorhamnetin appears to be a potent drug against esophageal cancer due to its in vitro potential to not only inhibit proliferation but also induce apoptosis of Eca-109 cells. (PMID: 15493462, 17368593, 17374653, 16963021).
(E,E)-N-4-Methoxystyrylcinnamide is found in fruits. (E,E)-N-4-Methoxystyrylcinnamide is an alkaloid from the leaves of Aegle marmelos (bael fruit
15(S)-hydroxyeicosatrienoic acid (15S-HETrE) is the in vivo metabolite of gamma-linolenic acid, a polyunsaturated fatty acid that have been reported to modulate arachidonic acid (AA) metabolism and tumorigenesis. 15S-HETrE suppress cyclooxygenase-2 (COX-2) over expression and/or Prostaglandin E2 (PGE2) biosynthesis (PMID 15197770), and inhibits [(3)H]thymidine uptake in parallel with the upregulation of peroxisome proliferator-activated receptor-gamma expression (a growth modulating nuclear receptor, PPARgamma). (PMID 12445673).
N-methyl-2-pyridone-5-carboxamide (2PY) is one of the end products of nicotinamide-adenine dinucleotide (NAD) degradation. Increased serum 2PY concentrations are observed in chronic renal failure (CRF) patients, which along with the deterioration of kidney function and its toxic properties (significant inhibition of PARP-1), suggests that 2PY is an uremic toxin. (PMID 12694300). 2PY has been identified as a uremic toxin according to the European Uremic Toxin Working Group (PMID: 22626821).
Dehydrophytosphingosine is found in pulses. Dehydrophytosphingosine is present in soybean phospholipids.
2(R)-Hydroxyicosanoic acid is along-chain hydroxy fatty acid. In humans fatty acids are predominantly formed in the liver and adipose tissue, and mammary glands during lactation.
Margaroylglycine is an acylglycine with C-17 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.
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.
2-Nonenoylglycine is classified as a member of the Alpha amino acids. Alpha amino acids are amino acids in which the amino group is attached to the carbon atom immediately adjacent to the carboxylate group (alpha carbon). 2-Nonenoylglycine is considered to be practically insoluble (in water) and acidic.
6-O-Acetylaustroinulin is isolated from Stevia rebaudiana (stevia).
N-oleoyl glycine is an acylglycine with oleoic acid (C18:1(9Z))moiety attached to glycine molecule. It is reported to be preferentially produced by human glycine N-acyltransferase-like 2 (hGLYATL2), a member of a gene family of 4 putative glycine conjugating enzymes, synthesizes various N-acyl glycines. Recombinantly expressed hGLYATL2 efficiently conjugated oleoyl-CoA, arachidonoyl-CoA, and other medium- and long-chain acyl-CoAs to glycine. The enzyme was specific for glycine as an acceptor molecule.
Nonadecanoic acid, also known as n-nonadecanoic acid or nonadecylic acid or C19:0, 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, with nonadecanoic acid (its ester is called nonadecanoate) having 19 carbon atoms. Nonadecanoic acid is a very hydrophobic molecule, practically insoluble (in water). It is a solid with a melting point of 69.4¬∞C.  It can be found in bacteria, plants, and animals (including animal milk) (Nature 176:882; PMID: 14168161).  It is secreted by termites (Rhinotermes marginalis) as part of its defence mechanism (Comp. Biochem. Physiol. B 71:731).
Homophytanic acid is a very long chain fatty acid (VLCFA) that is a derivative of phytanic acid. It is a branched chain fatty acid that has a methyl group in the gamma position.
Fragransol C is found in herbs and spices. Fragransol C is a constituent of Myristica fragrans (nutmeg)
Medroxyprogesterone, or MP is a progestin (synthetic progestogen). MP is not used medically, as it is over two orders of magnitude less potent than medroxyprogesterone acetate (MPA); a derivative of MP (PMID: 16784762). MP may be formed via the metabolism of MPA. Medroxyprogesterone acetate is used to treat conditions such as absent or irregular menstrual periods, or abnormal uterine bleeding. Synthetic progestogens are widely used to simulate the effects of progesterone; a natural female sex hormone. Progesterone is essential for endometrial receptivity, embryo implantation, and the successful establishment of pregnancy. A low progesterone concentration or an insufficient response to progesterone can cause infertility and pregnancy loss (PMID: 20104424). In addition to progestagenic activity, MP is also a weak antiandrogen in vitro (PMID: 29990947). Medroxyprogesterone is only found in individuals that have used or taken MPA.
13-HDoHE is an autoxidation product of docosahexaenoic acid DHA. 13-HDoHE is a long-chain polyunsaturated fatty acid that is any docosahexaenoic acid bearing a single hydroxy substituent. An oxidation product of docosahexaenoic acid metabolism. (CHEBI:72790)
Medroxyprogesterone, or MP is a progestin (synthetic progestogen). MP is not used medically, as it is over two orders of magnitude less potent than medroxyprogesterone acetate (MPA); a derivative of MP (PMID: 16784762). MP may be formed via the metabolism of MPA. Medroxyprogesterone acetate is used to treat conditions such as absent or irregular menstrual periods, or abnormal uterine bleeding. Synthetic progestogens are widely used to simulate the effects of progesterone; a natural female sex hormone. Progesterone is essential for endometrial receptivity, embryo implantation, and the successful establishment of pregnancy. A low progesterone concentration or an insufficient response to progesterone can cause infertility and pregnancy loss (PMID: 20104424). In addition to progestagenic activity, MP is also a weak antiandrogen in vitro (PMID: 29990947). Medroxyprogesterone is only found in individuals that have used or taken MPA.
15-HPETE is also known as 15-Hydroperoxy-5,8,11,13-eicosatetraenoic acid or (6E,8Z,11Z,14Z)-15-Hydroperoxyicosatetraenoate.  15-HPETE is considered to be practically insoluble (in water) and acidic.  15-HPETE is an eicosanoid lipid molecule
9(10)-EpODE is an epoxy fatty acid where linolenic acid has been epoxidized at the 9-10 positions through the action of cytochrome P450 epoxygenases. Epoxy fatty acids are termed 'leukotoxins' (the term includes a range of diverse compounds), because they produce their primary toxic effects against leukocytes. At high dosages, they have toxic cardiovascular effects, which can even result in death.
13-L-Hydroperoxylinoleic acid (13(S)-HPODE) is one of the primary products of the major polyunsaturated fatty acids (linoleic acid and arachidonic acid) from the 15-lipoxygenase pathway (EC 1.13.11.31). 13(S)-HPODE is a rather unstable metabolite and is rapidly metabolized to more stable secondary products such as diverse forms of hydroxy fatty acids (via reduction of the hydroperoxy group), alkoxy radicals (via homolytic cleavage of the peroxy group), forms of dihydro(pero)xy fatty acids (via lipoxygenase-catalysed double and triple oxygenation), or epoxy leukotrienes (via a hydrogen abstraction from a doubly allylic methylene group and a homolytic cleavage of the hydroperoxy group) (PMID: 9082450).
15-OxoETE or 15-KETE is a keto-containing leukotriene derivative produced by oxidation of the 15-hydroxyl of 15-HETE.
14,15-EpETE is an oxygenated lipid found in human blood. This fatty acyl belongs to the main class of eicosanoids and sub class of other eicosanoids. (Lipid Maps).
8(S)-HETE is a naturally occurring hydroxyeicosatetraenoic acid eicosanoid. 8(S)-HETE is a strong activator of peroxisome proliferator-activated receptors (PPARs) alpha and a weak activator of PPAR gamma. PPARs are nuclear hormone receptors that regulate gene transcription in response to peroxisome proliferators and fatty acids. PPARs also play an important role in the regulation of adipocyte differentiation. It is unclear however what naturally occurring compounds activate each of the PPAR subtypes. Additionally, 8(S)-HETE is able to induce differentiation of preadipocytes. (PMID: 7592593, 9113987).
15(S)-hydroxyeicosatrienoic acid (15S-HETrE) is the in vivo metabolite of gamma-linolenic acid, a polyunsaturated fatty acid that have been reported to modulate arachidonic acid (AA) metabolism and tumorigenesis. 15S-HETrE suppress cyclooxygenase-2 (COX-2) over expression and/or Prostaglandin E2 (PGE2) biosynthesis (PMID 15197770), and inhibits [(3)H]thymidine uptake in parallel with the upregulation of peroxisome proliferator-activated receptor-gamma expression (a growth modulating nuclear receptor, PPARgamma). (PMID 12445673).
12-keto-eicosatetraenoic acid is a biologically active eicosanoid in the nervous system of Aplysia.It is a metabolite of 12-HPETE formed by Aplysia nervous tissue. 12-KETE was identified in incubations of the tissue with arachidonic acid using HPLC, UV spectrometry, and gas-chromatography/mass spectrometry. [3H]12-KETE is formed from endogenous lipid stores in nervous tissue, labeled with [3H]arachidonic acid upon stimulation by application of histamine. In L14 and L10 cells, identified neurons in the abdominal ganglion, applications of 12-KETE elicit changes in membrane potential similar to those evoked by histamine.[PMID:2774398].
9-HETE, which is a product of free radical-mediated arachidonic acid oxidation, is significantly elevated in patients with angiographically defined CAD. (PMID: 17145556). 9-HETE is one of the six monohydroxy fatty acids produced by the non-enzymatic oxidation of arachidonic acid.
19(20)-EpDPE is a DHA epoxygenase metabolite, derived via epoxidation of the w-3 double bond of DHA. The EDHF (endothelium-derived hyperpolarizing factor) activity of 19(20)-EpDPE has not yet been determined. The epoxygenase metabolites of DHA have also been detected in a murine inflammation model (PMID: 12391014). EDHF is an unidentified mediator released from vascular endothelial cells in response to acetylcholine and bradykinin which is distinct from the NOS- (nitric oxide) and COX-derived (prostacyclin) vasodilators (PMID: 9504399, 10519554). Cytochrome P450 (CYP450) metabolism of polyunsaturated fatty acids produces epoxides such as 14(15)-EpETrE which are prime candidates for the actual active mediator (PMID: 9401962). However, the CYP450 metabolites of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) have been little studied relative to arachidonate epoxygenase metabolites.
16(17)-EpETE is the DHA homolog of 14(15)-EpETrE, derived via epoxidation of the 16,17-double bond of docosahexaenoic acid (DHA). The EDHF (endothelium-derived hyperpolarizing factor) activity of 16(17)-EpDPE has not yet been determined. The epoxygenase metabolites of DHA have also been detected in a murine inflammation model (PMID: 12391014). EDHF is an unidentified mediator released from vascular endothelial cells in response to acetylcholine and bradykinin which is distinct from the NOS- (nitric oxide) and COX-derived (prostacyclin) vasodilators (PMID: 9504399, 10519554). Cytochrome P450 (CYP450) metabolism of polyunsaturated fatty acids produces epoxides such as 14(15)-EpETrE which are prime candidates for the actual active mediator (PMID: 9401962). However, the CYP450 metabolites of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) have been little studied relative to arachidonate epoxygenase metabolites.
9,10-Epoxyoctadecenoic acid (9,10-EOA) is a peroxidation product of linoleic acid (LA). 9,10-EOA is a naturally occurring component of oxidized low density lipoprotein (LDL), the level of which increases with aging, atherosclerosis, and rheumatoid arthritis, perhaps due to an increase in 15-lipoxygenase and free oxygen radicals. 9,10-EOA is a proliferator-activated receptors (PPAR) gamma2 ligand, that is antiosteogenic without stimulating adipocyte differentiation. Studies in dogs suggest that 9,10-EOA has toxic cardiovascular effects. (PMID: 12665667, 12021203, 10667371).
Arachidonic acid 5-hydroperoxide (5-hydroperoxyeicosatetraenoic acid, 5-HPETE) is an intermediate in the production of leukotriene A4 from arachidonic acid.
5-oxo-6E,8Z,11Z,14Z-eicosatetraenoic acid (5-oxo-ETE), 5-lipoxygenase product is a potent chemoattractant for neutrophils and eosinophils. Its actions are mediated by the oxoeicosanoid (OXE) receptor, a member of the G protein-coupled receptor family.(PMID:18292294).
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).
prostaglandin E2 ethanolamide is the major prostanoid product derived from anandamide. Incubation of anandamide with lysates and the intact cell line expressing COX-2 but not that of COX-1 produced prostaglandin E2 ethanolamide. This reaction demonstrates the existence of a COX-2-mediated pathway for anandamide metabolism, and the metabolites formed represent a novel class of prostaglandins. Prostaglandins 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.
Anandamide, also known as arachidonoylethanolamide (AEA), is a highly potent endogenous agonist of the cannabinoid CB1 and CB2 receptors. CB1 receptors are predominantly found in the central nervous system (CNS) where they mainly mediate the psychotropic effects of tetrahydrocannabinol (THC) and endocannabinoids, whereas the expression of the CB2 receptor is thought to be restricted to cells of the immune system. It was suggested that AEA might inhibit tumour cell proliferation or induce apoptosis independently of CB1 and CB2 receptors, via interaction with the type 1 vanilloid receptor (VR1). VR1 is an ion channel expressed almost exclusively by sensory neurons, activated by pH, noxious heat (> 48-degree centigrade), and plant toxins and is thought to play an important role in nociception. Cervical cancer cells are sensitive to AEA-induced apoptosis via VR1 that is aberrantly expressed in vitro and in vivo while CB1 and CB2 receptors play a protective role. (PMID: 15047233). Novel prostaglandins (prostaglandin glycerol esters and prostaglandin ethanolamides) are COX-2 oxidative metabolites of endogenous cannabinoids (such as anandamide). Recent evidence suggests that these new types of prostaglandins are likely novel signalling mediators involved in synaptic transmission and plasticity (PMID: 16957004).
N-Palmitoylethanolamide (PEA) is present in the tissues of most mammals. It was initially described as an agonist of the type 2 cannabinoid receptor (CB2), although it is now universally recognized that PEA is in fact incapable of binding to cannabinoid receptors, or at least not to the known receptors. In addition to its anti-inflammatory activity, PEA also produces analgesia, neuroprotection, and possesses anti-epileptic properties. It also reduces gastrointestinal motility and cancer cell proliferation, as well as protecting the vascular endothelium in the ischemic heart. The physiological stimuli that regulate PEA levels in mammalian tissues are largely unknown, however, multiple studies indicate that this lipid accumulates during cellular stress, particularly following tissue injury. For example, PEA increases post-mortem in the pig brain. Similar elevations in PEA levels have been observed in the ischemic brain and PEA is also up-regulated in response to ultraviolet-B irradiation in mouse epidermal cells. Adipose tissue is highly implicated in the systemic secretion of IL-6 and leptin, and human mature adipocytes are able to secrete large quantity of PEA. Human adipose tissue can be subjected to modulation of its inflammatory state by lipopolysaccharide (LPS). LPS strongly inhibits adipose cell leptin release, with PEA acting as a potentiator of this inhibitory effect. These actions are not linked to a reduction in leptin gene transcription. Thus, PEA does not have an anti-inflammatory role in the secretion of IL-6 via NFkappaB at the adipocyte level, but instead seems to act at the heart of the LPS-stimulated pathway, which, independently of NFkappaB, inhibits the secretion of leptin. (PMID: 16884908).
Stearoylethanolamide is an N-acylethanolamine. N-acylethanolamines (NAEs) constitute a class of lipid compounds naturally present in both animal and plant membranes as constituents of the membrane-bound phospholipid, N-acylphosphatidylethanolamine (NAPE). NAPE is composed of a third fatty acid moiety linked to the amino head group of the commonly occurring membrane phospholipid, phosphatidylethanolamine. NAEs are released from NAPE by phospholipase D-type hydrolases in response to a variety of stimuli. Transient NAE release and accumulation has been attributed a variety of biological activities, including neurotransmission, membrane protection, and immunomodulation in animals. N-oleoylethanolamine is an inhibitor of the sphingolipid signaling pathway, via specific ceramidase inhibition (ceramidase converts ceramide to sphingosine). N-oleoylethanolamine blocks the effects of TNF- and arachidonic acid on intracellular Ca concentration. (PMID: 12692337, 12056855, 12560208, 11997249).
PGD2 ethanolamide is a N-acylethanolamine. N-acylethanolamines (NAEs) constitute a class of lipid compounds naturally present in both animal and plant membranes as constituents of the membrane-bound phospholipid, N-acylphosphatidylethanolamine (NAPE). NAPE is composed of a third fatty acid moiety linked to the amino head group of the commonly occurring membrane phospholipid, phosphatidylethanolamine. NAEs are released from NAPE by phospholipase D-type hydrolases in response to a variety of stimuli. Transient NAE release and accumulation has been attributed a variety of biological activities, including neurotransmission, membrane protection, and immunomodulation in animals. N-oleoylethanolamine is an inhibitor of the sphingolipid signaling pathway, via specific ceramidase inhibition (ceramidase converts ceramide to sphingosine). N-oleoylethanolamine blocks the effects of TNF- and arachidonic acid on intracellular Ca concentration. (PMID: 12692337, 12056855, 12560208, 11997249)
PC(18:1(11Z)/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(18:1(11Z)/18:1(11Z)), in particular, consists of two chains of vaccenic acid at the C-1 and C-2 positions. The vaccenic acid moieties are derived from butter fat and animal 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. 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(20:0/14:1(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(20:0/14:1(9Z)), in particular, consists of one chain of arachidic acid at the C-1 position and one chain of myristoleic acid at the C-2 position. The arachidic acid moiety is derived from peanut 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.
PC(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(14:0/16:0), in particular, consists of one chain of myristic acid at the C-1 position and one chain of palmitic acid at the C-2 position. The myristic acid moiety is derived from nutmeg and butter, 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(14:1(9Z)/22:2(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(14:1(9Z)/22:2(13Z,16Z)), in particular, consists of one chain of myristoleic acid at the C-1 position and one chain of docosadienoic acid at the C-2 position. The myristoleic acid moiety is derived from milk fats, while the docosadienoic 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.
PC(22:4(7Z,10Z,13Z,16Z)/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(22:4(7Z,10Z,13Z,16Z)/16:1(9Z)), in particular, consists of one chain of adrenic acid at the C-1 position and one chain of palmitoleic acid at the C-2 position. The adrenic acid moiety is derived from animal fats, 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(20:5(5Z,8Z,11Z,14Z,17Z)/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(20:5(5Z,8Z,11Z,14Z,17Z)/20:2(11Z,14Z)), in particular, consists of one chain of eicosapentaenoic acid at the C-1 position and one chain of eicosadienoic acid at the C-2 position. The eicosapentaenoic acid moiety is derived from fish oils, liver and kidney, 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(20:1(11Z)/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.
Thromboxanes. A stable, physiologically active compound formed in vivo from the prostaglandin endoperoxides. It is important in the platelet-release reaction (release of ADP and serotonin). -- Pubchem. Thromboxanes 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.
The simplest peptide, made of two glycine molecules; used in the synthesis of more complicated peptides. Glycine is a simple, nonessential amino acid, although experimental animals show reduced growth on low-glycine diets. The average adult ingests 3 to 5 grams of glycine daily. Glycine is involved in the body's production of DNA, phospholipids and collagen, and in release of energy. Glycine levels are effectively measured in plasma in both normal patients and those with inborn errors of glycine metabolism. (http://www.dcnutrition.com/AminoAcids/) Nonketotic hyperglycinaemia (OMIM 606899) is an autosomal recessive condition caused by deficient enzyme activity of the glycine cleavage enzyme system (EC 2.1.1.10). The glycine cleavage enzyme system comprises four proteins: P-, T-, H- and L-proteins (EC 1.4.4.2, EC 2.1.2.10 and EC 1.8.1.4 for P-, T- and L-proteins). Mutations have been described in the GLDC (OMIM 238300), AMT (OMIM 238310), and GCSH (OMIM 238330) genes encoding the P-, T-, and H-proteins respectively. The glycine cleavage system catalyses the oxidative conversion of glycine into carbon dioxide and ammonia, with the remaining one-carbon unit transferred to folate as methylenetetrahydrofolate. It is the main catabolic pathway for glycine and it also contributes to one-carbon metabolism. Patients with a deficiency of this enzyme system have increased glycine in plasma, urine and cerebrospinal fluid (CSF) with an increased CSF: plasma glycine ratio. (PMID 16151895).
L-alpha-Aminobutyric acid, also known as (S)-2-aminobutanoic acid, homoalanine, 2-AABA, or alpha-Aminobutyric acid, 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. Amino acids are organic compounds that contain amino (‚ÄìNH2) and carboxyl (‚ÄìCOOH) functional groups, along with a side chain (R group) specific to each amino acid. L-alpha-Aminobutyric acid is a non-proteogenic amino acid that can be found in the human kidney, in liver tissues, and in most biofluids or excreta (e.g. feces, breast milk, urine, and blood). Within the cell, L-alpha-aminobutyric acid is primarily located in the cytoplasm. alpha-Aminobutyric acid is biosynthesized by transamination of oxobutyrate, a metabolite in isoleucine biosynthesis. As a non-proteogenic amino acid, alpha-aminobutyric acid can be used by nonribosomal peptide synthases. One example of a nonribosomal peptide containing alpha-aminobutyric acid is ophthalmic acid, which was first isolated from calf lens. alpha-Aminobutyric acid is a non-essential amino acid that is primarily derived from the catabolism of methionine, threonine, and serine. High protein diets can result in significantly higher alpha-aminobutyrate levels in plasma (PMID: 26227325). alpha-Aminobutyric acid is elevated in the plasma of children with Reye's syndrome, tyrosinemia, homocystinuria, nonketotic hyperglycinemia, and ornithine transcarbamylase deficiency (PMID: 420125). alpha-Aminobutyric acid is one of the three isomers of aminobutyric acid. The two others are the neurotransmitter gamma-aminobutyric acid (GABA) and beta-aminobutyric acid (BABA) which is known for inducing plant disease resistance.
3-Hydroxybenzoic acid, also known as 3-hydroxybenzoate or 3-carboxyphenol, 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-Hydroxybenzoic acid exists in all living organisms, ranging from bacteria to humans. Outside of the human body, 3-hydroxybenzoic acid is found, on average, in the highest concentration in american cranberries and beers. 3-hydroxybenzoic acid has also been detected, but not quantified in a few different foods, such as bilberries, citrus, and corns. As well, 3-Hydroxybenzoic Acid can be found in the pineapple fruit. It can also be formed by a Pseudomonas species from 3-Chlorobenzoic acid. 3-Hydroxybenzoic acid is a monohydroxybenzoic acid. 3-Hydroxybenzoic acid can be obtained by the alkali fusion of 3-sulfobenzoic acid between 210-220 °C. 3-Hydroxybenzoic acid is a component of castoreum, the exudate from the castor sacs of the mature North American beaver (Castor canadensis) and the European beaver (Castor fiber), used in perfumery.
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).
5-Hydroxypentanoic acid belongs to the class of organic compounds known as straight chain fatty acids. These are fatty acids with a straight aliphatic chain. 5-Hydroxypentanoic acid has been found to be a microbial metabolite (PMID: 20615997).
Deoxyribose 1-phosphate is an intermediate in the metabolism of Pyrimidine. It is a substrate for Purine nucleoside phosphorylase and Thymidine phosphorylase.
4-aminophenol is considered a minor nephrotoxic metabolite of phenacetin and acetaminophen (paracetamol) in man. 4-Aminophenol can undergo autoxidations and metal-catalyzed and enzymatic oxidations in man to produce reactive oxygen species. (PMID 1713494).
Methylsuccinic acid (CAS: 498-21-5) is a normal metabolite found in human fluids. Increased urinary levels of methylsuccinic acid (together with ethylmalonic acid) are the main biochemical measurable features in ethylmalonic encephalopathy (OMIM: 602473), a rare metabolic disorder with an autosomal recessive mode of inheritance that is clinically characterized by neuromotor delay, hyperlactic acidemia, recurrent petechiae, orthostatic acrocyanosis, and chronic diarrhea (PMID:12382164). The underlying biochemical defect involves isoleucine catabolism (PMID:9667231). Methylsuccinic acid levels were found to have decreased in the urine of animals under D-serine-induced nephrotoxicity (D-serine causes selective necrosis of the proximal straight tubules in the rat kidney) (PMID:15596249). Moreover, methylsuccinic acid is found to be associated with ethylmalonic encephalopathy, isovaleric acidemia, and medium-chain acyl-CoA dehydrogenase deficiency, which are also inborn errors of metabolism.
Rhamnose (Rham) is a naturally occurring deoxy sugar. It can be classified as either a methyl-pentose or a 6-deoxy-hexose. Rhamnose occurs in nature in its L-form as L-rhamnose (6-deoxy-L-mannose). This is unusual, since most of the naturally occurring sugars are in D-form. Rhamnose is commonly bound to other sugars in nature. It is a common glycone component of glycosides from many plants. Rhamnose is also a component of the outer cell membrane of certain bacteria. L-rhamnose is metabolized to L-Lactaldehyde, which is a branching point in the metabolic pathway of L-fucose and L-rhamnose utilization. It exists in two anomeric forms, alpha-L-rhamnose and beta-L-rhamnose. Rhamnose has been found in Klebsiella, Pseudomonas (https://link.springer.com/article/10.1007/BF00369505) (https://onlinelibrary.wiley.com/doi/abs/10.1002/ejlt.200300816).
Hydroxyisocaproic acid is an end product of leucine metabolism in human tissues such as muscle and connective tissue. It belongs to 2-hydroxycarboxylic acid group of amino acid metabolites (PMID 6434570). Hydroxyisocaproic acid functions as an “anti-catabolite” and is widely used in the body building community. Chronic alpha-hydroxyisocaproic acid treatment of rats has been shown to improve muscle recovery after immobilization-induced atrophy (PMID: 23757407). Additionally, a 4-week hydroxyisocaproic acid supplementation of 1.5 g a day was shown to lead to increases in muscle mass during an intensive training period among soccer athletes (PMID: 20051111). Hydroxyisocaproic acid has also shown some potential as a topical antibiotic (PMID: 22483561). Elevated levels of 2-hydroxyisocaproic acid have been found in the urine of patients with dihydrolipoyl dehydrogenase (E3) deficiency (PMID: 6688766). Hydroxyisocaproic acid is also elevated in maple syrup urine disease, a genetic disorder, and has been shown to accelerate lipid peroxidation. It may also be an indicator of oxidative stress (PMID: 11894849). Hydroxyisocaproic acid has been found to be a metabolite of Lactobacillus and fungal species (http://jultika.oulu.fi/files/isbn9789526211046.pdf).
4-hydroxybenzoate, also known as 4-hydroxybenzoic acid, dilithium salt or para-hydroxybenzoic acid, is a member of the class of compounds known as benzoic acids. Benzoic acids are organic Compounds containing a benzene ring which bears at least one carboxyl group. 4-hydroxybenzoate is soluble (in water) and a weakly acidic compound (based on its pKa). 4-hydroxybenzoate can be found in a number of food items such as fennel, silver linden, cucurbita (gourd), and chinese cabbage, which makes 4-hydroxybenzoate a potential biomarker for the consumption of these food products.
Picolinic acid is a metabolite of the tryptophan catabolism. Picolinic acid is produced under inflammatory conditions and a costimulus with interferon-gamma (IFNgamma) of macrophage (Mphi) effector functions, is a selective inducer of the Mphi inflammatory protein-1alpha (MIP-1alpha) and -1beta (MIPs), two chemokines/cytokines involved in the elicitation of the inflammatory reactions and in the development of the Th1 responses. IFNgamma and picolinic acid have reciprocal effects on the production of MIPs chemokines and the expression of their receptor. The concerted action of IFNgamma and picolinic acid on MIP-1alpha/beta chemokine/receptor system is likely to be of pathophysiological significance and to represent an important regulatory mechanism for leukocyte recruitment and distribution into damaged tissues during inflammatory responses. Picolinic acid has an effect on the production of L-arginine-derived reactive nitrogen intermediates in macrophages, by augmenting IFN-gamma-induced NO2- production, and acts synergistically with IFN-gamma in activating macrophages. Children with acrodermatitis enteropathica (AE) are treated with oral zinc dipicolinate (zinc-PA). The concentration of picolinic acid in the plasma of asymptomatic children with AE was significantly less than that of normal children. However, oral treatment with PA alone is ineffective. The results support the hypothesis that the genetic defect in AE is in the tryptophan pathway, although the role of PA in zinc metabolism remains to be defined. (PMID:15206716, 8473748, 1701787, 6694049).
Furoic acid is a metabolite that appears in the urine of workers occupationally exposed to furfural and is a marker of exposure to this compound. Furfural is a heterocyclic aldehyde that is commonly used as a solvent in industry. It is readily absorbed into the body via the lungs and has significant skin absorption. Furfural is an irritant of the eyes, mucous membranes, and skin and is a central nervous system depressant. Furfural as a confirmed animal carcinogen with unknown relevance to humans (It has been suggested that is a substance that produces hepatic cirrhosis). Once in the body, furfural is metabolized rapidly via oxidation to the metabolite furoic acid, which is then conjugated with glycine and excreted in the urine in both free and conjugated forms. (PMID: 3751566, 4630229, 12587683). 2-Furoic acid is a biomarker for the consumption of beer
2,3-dimethyl-3-hydroxyglutaric acid has been found excreted in the urine by a patient with beta-ketothiolase deficiency. (PMID 6133567).
Parabanic Acid, also known as Parabanate or 2,4,5-Imidazolidinetrione, is classified as a member of the Imidazolinones. Imidazolinones are organic compounds containing an imidazolinone moiety, which is an imidazoline ring bearing a ketone. Parabanic Acid is considered to be soluble (in water) and acidic.  Parabanic Acid can be synthesized from imidazolidine. Parabanic Acid can be synthesized into 1-(2-phenylethyl)imidazolidine-2,4,5-trione
Protocatechuic acid, also known as protocatechuate or 3,4-dihydroxybenzoate, 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. The enzyme protocatechuate 3,4-dioxygenase uses 3,4-dihydroxybenzoate and O2 to produce 3-carboxy-cis,cis-muconate. Protocatechuic acid is a drug. In the analogous hardening of the cockroach ootheca, the phenolic substance concerned is protocatechuic acid. Protocatechuic acid is a mild, balsamic, and phenolic tasting compound. Outside of the human body, protocatechuic acid is found, on average, in the highest concentration in a few different foods, such as garden onions, cocoa powders, and star anises and in a lower concentration in lentils, liquors, and red raspberries. Protocatechuic acid has also been detected, but not quantified in several different foods, such as cloud ear fungus, american pokeweeds, common mushrooms, fruits, and feijoa. This could make protocatechuic acid a potential biomarker for the consumption of these foods. It is also found in Allium cepa (17,540 ppm). It is a major metabolite of antioxidant polyphenols found in green tea. Similarly, PCA was reported to increase proliferation and inhibit apoptosis of neural stem cells. In vitro testing documented antioxidant and anti-inflammatory activity of PCA, while liver protection in vivo was measured by chemical markers and histological assessment.
Gentisic acid, also known as gentisate or 2,5-dioxybenzoate, 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. Gentisic acid is also classified as a dihydroxybenzoic acid.  It is a derivative of benzoic acid and a minor (1%) product of the metabolic break down of aspirin, which is excreted by the kidneys. Gentisic acid is found in essentially all organisms ranging from bacteria to fungi to plants to animals. Gentisic acid has been associated with a number of useful effects on human health and exhibits anti-inflammatory, antigenotoxic, hepatoprotective, neuroprotective, antimicrobial, and especially antioxidant activities (PMID: 31825145). It is widely distributed in plants as a secondary plant product such as Gentiana spp., Citrus spp., Vitis vinifera, Pterocarpus santalinus, Helianthus tuberosus, Hibiscus rosa-sinensis, Olea europaea, and Sesamum indicum and in fruits such as avocados, batoko plum, kiwi fruits, apple, bitter melon, black berries, pears, and some mushrooms (PMID: 31825145). Gentisic acid is found in higher concentrations in a number of foods such as tarragons, common thymes, and common sages and in a lower concentration in grape wines, rosemaries, and sweet marjorams. Gentisic acid has also been shown to act as a pathogen-inducible signal for the activation of plant defenses in tomato plants and cucumbers (PMID: 16321412; https://doi.org/10.1094/MPMI.1999.12.3.227).
Citraconic acid, also known as 2-methylmaleate or methylmaleic acid, 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. Citraconic acid is a dicarboxylic acid consisting of maleic acid having a methyl substituent at the 2-position. Citraconic acid exists as a white solid. It is the cis-isomer of mesaconic acid and is one of the pyrocitric acids formed upon the heating of citric acid.  Citraconic acid has been detected in the urine of both normal and fasting individuals (PMID: 6778884). Citraconic acid is also elevated in the urine of individuals with methylmalonic acidaemia who have suffered ketotic attacks (PMID: 116077).  Altered serum levels of citraconic acid have been detected in patients with primary biliary cholangitis (PMID: 28400566).
Sumiki's acid is a naturally occurring human metabolite (PMID:949837). Sumiki's acid was first identified in the urine of a leukemic patient who was excreting an abnormal amount of its glycine derivative (PMID:5043270). Sumiki's acid was found to be excreted by normal subjects after a phenylalanine loading, while heterozygotes for phenylketonuria don't excrete it (instead, they excrete 2-hydroxybenzeneacetic acid) (PMID:4708049). Patients receiving furan-containing sugar solutions i.v. convert 50% of the 5-hydroxymethyl-2-furfural into Sumiki's acid (PMID:4202014). Sumiki's acid has been found to be a byproduct of the fungus Aspergillus and probably other species of fungi and yeast as well.
Maleic acid is a dicarboxylic acid, a molecule with two carboxyl groups. It consists of an ethylene group flanked by two carboxylic acid groups. Maleic acid is the cis isomer of butenedioic acid, whereas fumaric acid is the trans isomer. The cis isomer is the less stable one of the two; the difference in heat of combustion is 22.7 kJ/mol. The physical properties of maleic acid are very different from that of fumaric acid. Maleic acid is soluble in water whereas fumaric acid is not and the melting point of maleic acid (130 - 131 oC) is also much lower than that of fumaric acid (287 oC). Maleic acid is converted into maleic anhydride by dehydration, to malic acid by hydration, and to succinic acid by hydrogenation. Maleic acid is used in making polyesters for fibre-reinforced laminated moldings and paint vehicles. More specifically it is used in the manufacture of phthalic-type alkyd and polyester resins, surface coatings, copolymers, plasticizers, lubricant additives and agricultural chemicals. It is also found in adhesives and sealants and as a preservative for oils and fats. In the natural world, maleic acid has been identified in ginseng, pineapple, cacao plants, sour cherries and corn. A large number of microbes are able to convert maleic acid to D-malate using the enzyme maleate hydratase (PMID: 1444397).
Salicin, also known as salicoside or delta-salicin, is an aryl beta-D-glucoside that is salicyl alcohol in which the phenolic hydrogen has been replaced by a beta-D-glucosyl residue. It has a role as a prodrug, an antipyretic, a non-narcotic analgesic, a non-steroidal anti-inflammatory drug, an EC 1.14.99.1 (prostaglandin-endoperoxide synthase) inhibitor and a metabolite. It is an aryl beta-D-glucoside, an aromatic primary alcohol and a member of benzyl alcohols. It derives from a salicyl alcohol.  Salicin 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. Among the sugar units found in natural glycosides are D-glucose, L-Fructose, and L rhamnose. Salicin exists in all living organisms, ranging from bacteria to humans. Salicin is a bitter tasting compound.
Lactic acid is an organic acid. It is a chiral molecule, consisting of two optical isomers, L-lactic acid and D-lactic acid, with the L-isomer being the most common in living organisms. Lactic acid plays a role in several biochemical processes and is produced in the muscles during intense activity. D-Lactic acid is the end product of the enzyme glyoxalase II (or hydroxyacyl-glutathione hydrolase) (EC 3.1.2.6), which converts the intermediate substrate S-lactoyl-glutathione to reduced glutathione and D-lactate (OMIM: 138790). Lactic acid is a microbial metabolite found in Aerococcus, Bacillus, Carnobacterium, Corynebacterium, Enterococcus, Escherichia, Lactobacillus, Lactococcus, Leuconostoc, Oenococcus, Pediococcus, Rhizopus, Saccharomyces, Streptococcus, Tetragenococcus, Vagococcus and Weissella (PMID:26287368; PMID:26360870).
L-glyceric acid is a human urinary metabolite present in patients with L-Glyceric aciduria. The formation of L-glyceric acid from accumulated hydroxypyruvate is due to deficiency of human glyoxylate reductase/hydroxypyruvate reductase (GRHPR, EC 1.1.1.81), a D-2-hydroxy-acid dehydrogenase that plays a critical role in the removal of the metabolic by-product glyoxylate from within the liver. Deficiency of this enzyme is the underlying cause of primary hyperoxaluria type 2 (PH2) and leads to increased urinary oxalate levels, formation of kidney stones and renal failure. (PMID: 16756993).
Histamine is an amine derived by enzymatic decarboxylation of histidine. It is a powerful stimulant of gastric secretion, a constrictor of bronchial smooth muscle, a vasodilator, and also a centrally acting neurotransmitter. Histamine can be found in Photobacterium phosphoreum and Lactobacillus (PMID:17066936). Histamine belongs to the class of organic compounds known as 2-arylethylamines. These are primary amines that have the general formula RCCNH2, where R is an organic group. High amounts of histamine have been found in spinach, oats and ryes. Another foods such as green beans, broccoli, and beetroots also contain histamine but in lower concentrations. Histamine has also been detected but not quantified in several different foods, such as groundcherries, carobs, bok choy, biscuits, and longans.
Folic acid or folate, is a vitamin that belongs to the class of compounds known as pterins. Chemically, folate consists of three distinct chemical moieties linked together. A pterin (2-amino-4-hydroxy-pteridine) linked by a methylene bridge to a p-aminobenzoyl group that in turn is linked through an amide linkage to glutamic acid. It is a member of the vitamin B family and is primarily known as vitamin B9. Folate is required for the body to make DNA and RNA and metabolize amino acids necessary for cell division for the hematopoietic system. As humans cannot make folate, it is required in the diet, making it an essential nutrient (i.e. a vitamin). Folate occurs naturally in many foods including mushrooms, spinach, yeast, green leaves, and grasses (poaceae). Folic acid, being biochemically inactive, is converted to tetrahydrofolic acid and methyltetrahydrofolate by the enzyme known as dihydrofolate reductase. Tetrahydrofolate and methyltetrahydrofolate are transported across cells by receptor-mediated endocytosis where they are needed to maintain normal erythropoiesis, synthesize purine and thymidylate nucleic acids, interconvert amino acids and generate formic acid. Folic acid is used in the treatment and prevention of folate deficiencies and megaloblastic anemia. Folic acid is also used as a supplement by women during pregnancy to reduce the risk of neural tube defects (NTDs) in babies. Low levels in early pregnancy are believed to be the cause of more than half of babies born with NTDs (PMID: 28097362). Folic acid is also a microbial metabolite produced by Bifidobacterium and Lactobacillus (PMID: 22254078).
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).
Hydroxyphenyllactic acid or 4-hydroxyphenyllactate (the L-form) is a tyrosine metabolite. The level of L-hydroxyphenyllactic acid is elevated in patients with a deficiency of the enzyme p-hydroxyphenylpyruvate oxidase (EC 1.14.2.2) (PMID: 4720815). L-hydroxyphenyllactate is present in relatively higher concentrations in the cerebrospinal fluid and urine of patients with phenylketonuria (PKU) and tyrosinemia (PMID: 3126358). However, the D-form of hydroxyphenyllactate is of bacterial origin and is also found in individuals with bacterial overgrowth or unusual gut microflora (PMID: 3126358).  Microbial hydroxyphenyllactate is likely derived from phenolic or polyphenolic compounds in the diet.  Bifidobacteria and lactobacilli produce considerable amounts of phenyllactic and p-hydroxyphenyllactic acids (PMID: 23061754).  It has also been shown that hydroxyphenyllactate decreases ROS (reactive oxygen species) production in both mitochondria and neutrophils and so hydroxyphenyllactate may function as a natural anti-oxidant (PMID: 23061754). Hydroxyphenyllactic acid is a microbial metabolite found in Acinetobacter, Bacteroides, Bifidobacteria, Bifidobacterium, Clostridium, Enterococcus, Escherichia, Eubacterium, Klebsiella, Lactobacillus, Pseudomonas and Staphylococcus (PMID: 19961416).
Liothyronine is a T3 thyroid hormone normally synthesized and secreted by the thyroid gland in much smaller quantities than thyroxine (T4). Most T3 is derived from peripheral monodeiodination of T4 at the 5' position of the outer ring of the iodothyronine nucleus. The hormone that is finally delivered and used by the tissues is mainly T3. Liothyronine is mildly toxic by ingestion and is an experimental teratogen. When heated to decomposition it emits toxic fumes of NOx, I(-), and Cl(-) (Sax's Dangerous Properties of Industrial Materials).
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).
Sphinganine 1-phosphate is an intermediate in the metabolism of Glycosphingolipids and sphingolipids. It is a substrate for Sphingosine kinase 1, Lipid phosphate phosphohydrolase 2, Sphingosine kinase 2, Sphingosine-1-phosphate lyase 1, Lipid phosphate phosphohydrolase 1 and Lipid phosphate phosphohydrolase 3.
Metanephrine is a metabolite of epinephrine created by action of catechol O-methyltransferase on epinephrine. Technically it is a product of epinephrine O-methylation. It is a commonly occurring, pharmacologically and physiologically inactive metabolite of epinephrine. The measurement of plasma free metanephrines is considered to be the best tool in the diagnosis of pheochromocytoma, a rare kind of adrenal medullary neoplasm. In adrenal chromaffin cells, leakage of norepinephrine and epinephrine from storage granules leads to substantial intracellular production of the O-methylated metabolite metanephrine. In fact, the adrenals constitute the single largest source out of any organ system including the liver for circulating metanephrine. In humans, about 93 percent of circulating metanephrine is derived from catecholamines metabolized within adrenal chromaffin cells. (PMID 15317907).
Epinephrine is a catecholamine, a sympathomimetic monoamine derived from the amino acids phenylalanine and tyrosine. It is the active sympathomimetic hormone secreted from the adrenal medulla in most species. It stimulates both the alpha- and beta- adrenergic systems, causes systemic vasoconstriction and gastrointestinal relaxation, stimulates the heart, and dilates bronchi and cerebral vessels. It is used in asthma and cardiac failure and to delay absorption of local anesthetics. Epinephrine also constricts arterioles in the skin and gut while dilating arterioles in leg muscles. It elevates the blood sugar level by increasing hydrolysis of glycogen to glucose in the liver, and at the same time begins the breakdown of lipids in adipocytes. Epinephrine has a suppressive effect on the immune system.
Tyramine-O-sulfate is a sulfate derivative of tyramine. Tyramine is formed from the decarboyxlation of tyrosine. Tyramine O-sulfate is found in the urine of patients following an oral load of tyramine with unipolar and bipolar major depressive episode. (PMID: 8432957, 2175186).
N-Acetyl-D-Glucosamine (N-acetlyglucosamine) is a monosaccharide derivative of glucose. Chemically it is an amide between glucosamine and acetic acid. A single N-acetlyglucosamine moiety linked to serine or threonine residues on nuclear and cytoplasmic proteins -O-GlcNAc, is an ubiquitous post-translational protein modification. O-GlcNAc modified proteins are involved in sensing the nutrient status of the surrounding cellular environment and adjusting the activity of cellular proteins accordingly. O-GlcNAc regulates cellular responses to hormones such as insulin, initiates a protective response to stress, modulates a cell's capacity to grow and divide, and regulates gene transcription. In humans, it exists in skin, cartilage and blood vessel as a component of hyaluronic acid, and bone tissue, cornea and aorta as a component of keratan sulfate. (PMID 16237703).
Dehydroepiandrosterone sulfate or DHEA-S is the sulfated form of dehydroepiandrosterone (DHEA). This sulfation is reversibly catalyzed by sulfotransferase 2A1 (SULT2A1) primarily in the adrenals, the liver, and small intestine. In the blood, most DHEA is found as DHEA-S with levels that are about 300 times higher than those of free DHEA. Orally-ingested DHEA is converted into its sulfate when passing through the intestines and liver. Whereas DHEA levels naturally reach their peak in the early morning hours, DHEAS levels show no diurnal variation. From a practical point of view, measurement of DHEA-S is preferable to DHEA since levels are more stable. DHEA (from which DHEA-S comes from) is a natural steroid prohormone produced from cholesterol by the adrenal glands, the gonads, adipose tissue, brain, and in the skin (by an autocrine mechanism). DHEA is the precursor of androstenedione, which can undergo further conversion to produce the androgen testosterone and the estrogens estrone and estradiol. DHEA is also a potent sigma-1 agonist. Serum dehydroepiandrosterone sulfate is a classic marker for adrenarche, and subsequently for the individual hormonal milieu (PMID: 10599744). Dehydroepiandrosterone sulfate is an endogenously produced sex steroid that has been hypothesized to have anti-aging effects (PMID: 16960027). It also has been inversely associated with the development of atherosclerosis (PMID: 8956025).
2-Dodecanone, also known as dodecan-2-one or dodecanone-(2) is a 12-carbon long-chain aliphatic molecule that 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-Dodecanone is also considered to be a long-chain methyl ketone. 2-Dodecanone is a very hydrophobic molecule, practically insoluble (in water), and relatively neutral. It has a low melting point of just 19 oC. 2-Dodecanone has a citrus, floral, or fruity aroma which is contrasted with a fatty taste. 2-Dodecanone has been found in the volatile components of human feces (PMID: 21970810) and saliva (PMID: 24421258). It has also been linked celiac disease in children (PMID: 21970810). Outside of the human body, 2-dodecanone has been found at levels of up to 1.8 mg/kg in blue cheese, milk and cocoa and up to 2700 mg/kg in hop oil (Humulus lupulus). It has also been detected, but not quantified in, several other oils, such as laurel leaf oil, rue oil (Ruta graveolens) and tomato leaves and trichomes (PMID: 11757742). This could make 2-dodecanone a potential biomarker for the consumption of these foods. 2-Dodecanone is a natural insecticide and exhibits strong insecticidal properties to several insect species including Tribolium castaneum (LD50 = 5.21 ug/adult), Lasioderma serricorne (LD50 = 2.54 ug/adult) and Liposcelis bostrychophila (LD50 = 23.41 ug/cm2) in contact assays (PMID: 31240663).
Isoleucylproline is a dipeptide composed of isoleucine 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).
DG(16:0/0:0/18:1n9) 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 the C-1, C-2, or C-3 positions. DG(16:0/0:0/18:1n9), in particular, consists of one chain of palmitic acid at the C-1 position and one chain of oleic acid at the C-3 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. 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.<br />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.<br />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-3 position.
Sphingomyelin (d18:1/20:0) or SM(d18:1/20:0) 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(d18:1/20:0) consists of a sphingosine 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.
Sphingomyelin (d18:1/22:1(13Z)) or SM(d18:1/22:1(13Z)) 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(d18:1/22:1(13Z)) consists of a sphingosine backbone and an erucic 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(18:0/18:2(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(18:0/18:2(9Z,12Z)), in particular, consists of one chain of stearic acid at the C-1 position and one chain of linoleic acid at the C-2 position. The stearic acid moiety is derived from animal fats, coco butter and sesame 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.
Sphingomyelin (d18:0/22:0) or SM(d18:0/22:0) 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(d18:0/22:0) consists of a sphinganine backbone and a behenic 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.
Production by a sugar cane isolate of Pseudomonas syringae pv. syringae. Syringomycin is a general name given to a class of lipodepsinonapeptide molecules which are secreted by the plant pathogen Pseudomonas syringae. Lipodepsinonapeptides comprise a closed ring of nine nonribosomally-synthesized amino acids bonded to a fatty acid hydrocarbon tail. A commonly-encountered pathovar (pv) of P. syringae is P. syringae pv syringae which secretes a number of closely-related forms of the molecule. Syringomycins are virulence determinants which means that their secretion is required for the manifestation of disease symptoms on a number of stone fruit crop plants.
Fenoprofen is only found in individuals that have used or taken this drug. It is an anti-inflammatory analgesic and antipyretic highly bound to plasma proteins. It is pharmacologically similar to aspirin, but causes less gastrointestinal bleeding. [PubChem]Fenoprofen's exact mode of action is unknown, but it is thought that prostaglandin synthetase inhibition is involved. Fenoprofen has been shown to inhibit prostaglandin synthetase isolated from bovine seminal vesicles.
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).
1-(beta-D-Ribofuranosyl)-1,4-dihydronicotinamide is the reduced form of nicotinamide riboside. Nicotinamide riboside or NR is a natural product found in milk. It can exist in both the oxidized and reduced form. Nicotinamide riboside is a newly discovered precursor to NAD ( nicotinamide adenine dinucleotide). Nicotinamide riboside kinases (Nrks) are essential for this NAD synthesis pathway. Nrks actually constitute a distinct pathway of NAD biosynthesis and it appears that nicotinamide riboside may be the only vitamin precursor that supports neuronal NAD synthesis (PMID: 18429699). NAD homeostasis is related to the free radical-mediated production of reactive oxygen species responsible for irreversible cellular damage in infectious disease, diabetes, inflammatory syndromes, neurodegeneration and cancer. (PMID: 18508649). Baseline requirements for NAD synthesis can be met either with dietary tryptophan or with less than 20 mg of daily niacin, which consists of nicotinic acid and/or nicotinamide. Reduced nicotinamide riboside is also known to be a substrate for ribosyldihydronicotinamide dehydrogenase (EC 1.10.99.2). It is also a substrate for purine-nucleoside phosphorylase (PNP) - (PMID: 9030766).
Epitheaflavic acid is found in tea. Epitheaflavic acid is isolated from black tea Camellia sinensis.
4-oxo-Retinoic acid is a biologically active geometric isomer of retinoic acid (RA). 4-oxo-retinoic acid is generated from its precursor canthaxanthin and enhances gap junctional communication in cells. Metabolic transformation of all-trans RA to 4-hydroxylated RA appears to be primarily catalyzed by the cytochrome P 450 (CYP) 26AI in human skin cells. Cellular levels of all-trans RA are meticulously regulated utilizing an array of systems to balance uptake, biosynthesis, catabolism, and efflux transport. RA is a critical regulator of gene expression during embryonic development and in the maintenance of adult epithelial tissues. (PMID: 8794203, 7893159, 17330217, 16778795, 17460545).
Cyclobenzaprine is a skeletal muscle relaxant and a central nervous system (CNS) depressant. Cyclobenzaprine acts on the locus coeruleus where it results in increased norepinephrine release, potentially through the gamma fibers which innervate and inhibit the alpha motor neurons in the ventral horn of the spinal cord. It is structurally similar to Amitriptyline, differing by only one double bond.
desmethylcyclobenzaprine is a metabolite of cyclobenzaprine. Cyclobenzaprine, brand name Flexeril, is a muscle relaxant medication used to relieve skeletal muscle spasms and associated pain in acute musculoskeletal conditions. It is the most well-studied drug for this application, and it also has been used off-label for fibromyalgia treatment. A new bedtime formulation of cyclobenzaprine is under development for the management of fibromyalgia syndrome. (Wikipedia)
(E)-Hept-2-ene belongs to the class of organic compounds known as acyclic olefins. These are olefins that do not contain a ring in their structure.
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.
2,5-dichlorophenol belongs to the family of Phenols and Derivatives. These are compounds containing a phenol moiety, which is a benzene bearing an hydroxyl group.
O-6-deoxy-a-L-galactopyranosyl-(1->2)-O-b-D-galactopyranosyl-(1->3)-2-(acetylamino)-2-deoxy-D-Galactose is a milk oligosaccharide alditol derived from mucin glycoprotein detected with High-performance anion exchange-chromatography. (PMID: 1799211). This oligosaccharide alditol is also found in purified human bronchial mucins. (PMID: 1337867) This O-glycan is present in normal human mucins along the intestinal tract. (PMID: 15361072).
Acenocoumarol is a coumarin derivative used as an anticoagulant. Coumarin derivatives inhibit the reduction of vitamin K by vitamin K reductase. This prevents carboxylation of vitamin K-dependent clotting factors, II, VII, XI and X, and interferes with coagulation. Hematocrit, hemoglobin, international normalized ratio and liver panel should be monitored. Patients on acenocoumarol are prohibited from giving blood.
Tetrahydrocorticosterone 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, tetrahydrocorticosterone is considered to be a steroid lipid molecule. Tetrahydrocorticosterone is a very hydrophobic molecule, practically insoluble (in water), and relatively neutral. Tetrahydrocorticosterone is one of the major urinary metabolites from corticosterone. Premenopausal patients with early breast cancer excrete subnormal amounts of tetrahydrocorticosterone as compared with the normal subjects of corresponding ages (PMID: 1133844).
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.
3-Hydroxyflavone is found in brassicas. 3-Hydroxyflavone is a constituent of cabbage
1-Octene is used as a food additive [EAFUS] ("EAFUS: Everything Added to Food in the United States. [http://www.eafus.com/]")
An anthelmintic with schistosomicidal activity against Schistosoma mansoni, but not against other Schistosoma spp. Oxamniquine causes worms to shift from the mesenteric veins to the liver where the male worms are retained; the female worms return to the mesentery, but can no longer release eggs. (From Martidale, The Extra Pharmacopoeia, 31st ed, p121)
O-6-deoxy-a-L-galactopyranosyl-(1->2)-O-b-D-galactopyranosyl-(1->3)-2-(acetylamino)-2-deoxy-D-Galactose is a milk oligosaccharide alditol derived from mucin glycoprotein detected with High-performance anion exchange-chromatography. (PMID: 1799211). This oligosaccharide alditol is also found in purified human bronchial mucins. (PMID: 1337867) This O-glycan is present in normal human mucins along the intestinal tract. (PMID: 15361072).
1-nitronaphthalene is also known as Nitrol
1,1-Dimethoxyethane is found in fig. 1,1-Dimethoxyethane is a flavouring ingredien
1,1-Diethoxyethane is found in garden onion. 1,1-Diethoxyethane is a flavouring ingredient used in fruit, rum and whisky flavour
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.
Simmondsin is found in coffee and coffee products. Simmondsin is a constituent of Simmondsia chinensis (jojoba) Simmondsin is an extract of jojoba seeds (pronounced "ho-HO-bah") (Simmondsia chinensis), it was traditionally thought to be a toxic substance due to jojoba seed meal causing weight loss in animals, but recently it has been researched as a potential treatment for reducing appetite of obese individuals by helping to reduce craving for food. Several mechanisms of action are thought to be involved in the appetite suppressant effect
Dipentene is found in carrot. Dipentene is a constituent of many essential oils
Tropicamide is only found in individuals that have used or taken this drug. It is one of the muscarinic antagonists with pharmacologic action similar to atropine and used mainly as an ophthalmic parasympatholytic or mydriatic. [PubChem]Tropicamide binds to and blocks the receptors in the muscles of the eye (muscarinic receptor M4). Tropicamide acts by blocking the responses of the iris sphincter muscle to the iris and ciliary muscles to cholinergic stimulation, producing dilation of the pupil and paralysis of the ciliary muscle.
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.
Guanabenz is only found in individuals that have used or taken this drug. It is an alpha-2 selective adrenergic agonist used as an antihypertensive agent. [PubChem]Guanabenz's antihypertensive effect is thought to be due to central alpha-adrenergic stimulation, which results in a decreased sympathetic outflow to the heart, kidneys, and peripheral vasculature in addition to a decreased systolic and diastolic blood pressure and a slight slowing of pulse rate. Chronic administration of guanabenz also causes a decrease in peripheral vascular resistance.
cis-Zearalenone is a metabolite of Fusarium species.
Oxatomide is a first-generation piperazine H1-antihistamine.
Desethylchloroquine is the major product of the stereoselective human metabolism of Chloroquine, used for the therapy and prevention of malaria.
Emopamil is a drug that is a competitive inhibitor of 3&#946;-hydroxysteroid-&#916;8-&#916;7-isomerase. 3&#946;-hydroxysteroid-&#916;8-&#916;7-isomerase is involved in the formation of cholesterol from lanosterol. Emopamil is a calcium channel blocker.
Warfarin is an anticoagulant that acts by inhibiting the synthesis of vitamin K-dependent coagulation factors. Warfarin is indicated for the prophylaxis and/or treatment of venous thrombosis and its extension, pulmonary embolism, and atrial fibrillation with embolization. It is also used as an adjunct in the prophylaxis of systemic embolism after myocardial infarction. Warfarin is also used as a rodenticide.
4-ene-Valproic acid is only found in individuals that have used or taken Valproic Acid. 4-ene-Valproic acid is a metabolite of Valproic Acid. 4-ene-valproic acid belongs to the family of Branched Fatty Acids. These are fatty acids containing a branched chain.
4-Pentenoic acid is a flavouring ingredien
Coproporphyrin I is a porphyrin metabolite arising from heme synthesis. Porphyrins are pigments found in both animal and plant life. Coproporphyrin I is a tetrapyrrole dead-end product from the spontaneous oxidation of the methylene bridges of coproporphynogen, arising from heme synthesis and secreted in feces and urine. Increased levels of coproporphyrins can indicate congenital erythropoietic porphyria or sideroblastic anaemia. Porphyria is a pathological state characterised by abnormalities of porphyrin metabolism and results in the excretion of large quantities of porphyrins in the urine and in extreme sensitivity to light. A large number of factors are capable of increasing porphyrin excretion, owing to different and multiple causes and etiologies: 1) the main site of the chronic hepatic porphyria disease process concentrates on the liver, 2) a functional and morphologic liver injury is almost regularly associated with this chronic porphyria, 3) the toxic form due to occupational and environmental exposure takes mainly a subclinical course. Hepatic factors includes disturbance in coproporphyrinogen metabolism, which results from inhibition of coproporphyrinogen oxidase as well as from the rapid loss from, and diminished utilization of coproporphyrinogen in the hepatocytes, which may also explain why coproporphyrin, its autoxidation product, predominates physiologically in the urine; decreased biliary excretion of coproporphyrin leading to a compensatory urinary excretion, so that the coproporphyrin ring isomer ratio (1:III) becomes a sensitive index for impaired liver function and intrahepatic cholestasis; and disturbed activity of hepatic uroporphyrinogen decarboxylase. In itself, secondary coproporphyrinuria is not associated with porphyria symptoms of a hepatologic-gastroenterologic, neurologic, or dermatologic order, even though coproporphyrinuria can occur with such symptoms. (PMID: 3327428).
Sorbitan stearate is a food emulsifier, stabiliser, defoaming agent, flavouring and flavour modifier, rehydration agent for active dried yeast, coating for fruit and vegetables and other food uses Sorbitan monostearate (also known as Span 60) is an ester of sorbitan (a sorbitol derivative) and stearic acid and is sometimes referred to as a synthetic wax. It is primarily used as an emulsifier to keep water and oils mixed. Sorbitan monostearate is used in the manufacture of food and healthcare products, and is a non-ionic surfactant with emulsifying, dispersing, and wetting properties
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.
3'-deoxyderhamnosylmaysin is a member of the class of compounds known as flavonoid c-glycosides. Flavonoid c-glycosides are compounds containing a carbohydrate moiety which is C-glycosidically linked to the 2-phenylchromen-4-one flavonoid backbone. 3'-deoxyderhamnosylmaysin is slightly soluble (in water) and a very weakly acidic compound (based on its pKa). 3'-deoxyderhamnosylmaysin can be found in corn, which makes 3'-deoxyderhamnosylmaysin a potential biomarker for the consumption of this food product.
Lamivudine-triphosphate 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)
Quinupristin/dalfopristin is a combination of two antibiotics used to treat infections by staphylococci and by vancomycin-resistant Enterococcus faecium. Dalfopristin inhibits the early phase of protein synthesis in the bacterial ribosome and quinupristin inhibits the late phase of protein synthesis. The combination of the two components acts synergistically and is more effective in vitro than each component alone.
Dalfopristin is a combination of two antibiotics (Dalfopristin and quinupristin) used to treat infections by staphylococci and by vancomycin-resistant Enterococcus faecium. It is not effective against Enterococcus faecalis infections. Dalfopristin inhibits the early phase of protein synthesis in the bacterial ribosome and quinupristin inhibits the late phase of protein synthesis.
Trans-3'-hydroxycotinine, also known as 1-methyl-3-hydroxy-5-(3-pyridyl)-2-pyrrolidinone, is a member of the class of compounds known as pyrrolidinylpyridines. Pyrrolidinylpyridines are compounds containing a pyrrolidinylpyridine ring system, which consists of a pyrrolidine ring linked to a pyridine ring. Trans-3'-hydroxycotinine is soluble (in water) and a very weakly acidic compound (based on its pKa). Trans-3'-hydroxycotinine can be found in a number of food items such as annual wild rice, macadamia nut, corn salad, and radish, which makes trans-3'-hydroxycotinine a potential biomarker for the consumption of these food products.
Rutaecarpine belongs to the family of Pyridopyrimidines. These are compounds containing a pyridopyrimidine, which consists of a pyridine fused to a pyrimidine.
2-Hydroxyethanesulfonate (also known as 2-Hydroxyethanesulfonic acid or isethionic acid) is an organosulfur compound containing a short chain alkane sulfonate linked to a hydroxyl group. It is a water-soluble liquid used in the manufacture of mild, biodegradable, and high-foaming anionic surfactants. These surfactants provide gentle cleansing and a soft skin feel. 2-Hydroxyethanesulfonate forms a colourless, syrupy, and strongly acidic liquid that can form detergents with oleic acid. 2-Hydroxyethanesulfonate is frequently used in the industrial production of taurine. Mammals are also able to endogenously synthesize 2-hydroxyethanesulfonate via taurine through a possible enzymatic deamination process (PMID: 14490797). 2-Hydroxyethanesulfonate can be found in both human plasma and urine (PMID: 1159536, PMID: 6066118). Higher plasma levels of 2-hydroxyethanesulfonate have been shown to be protective against type 2 diabetes.
Phenelzine is only found in individuals that have used or taken this drug. It is an irreversible non-selective inhibitor of monoamine oxidase. May be used to treat major depressive disorder.Although the exact mechanism of action has not been determined, it appears that the irreversible, nonselective inhibition of MAO by phenelzine relieves depressive symptoms by causing an increase in the levels of serotonin, norepinephrine, and dopamine in the neuron.
7-Dehydrocholesterol (7-DHC), also known as provitamin D3 or 5,7-cholestadien-3-b-ol, belongs to the class of organic compounds known as cholesterols and derivatives. Cholesterols and derivatives are compounds containing a 3-hydroxylated cholestane core. Thus, 7-dehydrocholesterol is also classified as a sterol. 7-Dehydrocholesterol is known as a zoosterol, meaning that it is a sterol isolated from animals (to distinguish those sterols isolated from plants which are called phytosterols). 7-DHC functions in the serum as a cholesterol precursor and is photochemically converted to vitamin D3 in the skin. Therefore 7-DHC functions as provitamin-D3. The presence of 7-DHC in human skin enables humans and other mammals to manufacture vitamin D3 (cholecalciferol) from ultraviolet rays in the sun light, via an intermediate isomer pre-vitamin D3. 7-DHC absorbs UV light most effectively at wavelengths between 290 and 320 nm and, thus, the production of vitamin D3 will occur primarily at those wavelengths (PMID: 9625080).  The two most important factors that govern the generation of pre-vitamin D3 are the quantity (intensity) and quality (appropriate wavelength) of the UVB irradiation reaching the 7-dehydrocholesterol deep in the stratum basale and stratum spinosum (PMID: 9625080). 7-DHC is also found in the milk of several mammalian species, including cows (PMID: 10999630; PMID: 225459). It was discovered by Nobel-laureate organic chemist Adolf Windaus. 7-DHC can be produced by animals and plants via different pathways (PMID: 23717318). It is not produced by fungi in significant amounts. 7-DHC is made by some algae and can also be produced by some bacteria.
12-hydroxydodecanoic acid is the substrate of the human glutathione-dependent formaldehyde dehydrogenase (EC1.1.1.1). The enzyme that catalyzes the conversion of alcohols to aldehydes is a zinc-containing dimeric enzyme responsible for the oxidation of long-chain alcohols and omega-hydroxy fatty acids. (OMIM). The human glutathione-dependent formaldehyde dehydrogenase is unique among the structurally studied members of the alcohol dehydrogenase family in that it follows a random bi kinetic mechanism forming a binary complex, and a ternary complex with NAD+. (PMID 12196016).
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).
Octyl gallate is an antioxidant used in margarin
Cephapirin is an injectable, first-generation cephalosporin antibiotic that has a wide spectrum of activity against gram-positive and gram-negative organisms. The bactericidal activity of cephapirin results from the inhibition of cell wall synthesis via affinity for penicillin-binding proteins (PBPs). Cephapirin is more resistant to beta-lactamases than the penicillins, and therefore is effective against staphylococci, with the exception of methicillin-resistant staphylococci. Cephapirin is FDA approved for use in food-producing animals, especially dairy cattle. Cephapirin is used for the treatment of mastitis in cows. Production for use in humans has been discontinued in the United States. It is marketed under the trade name Cefadyl.
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).
Bupropion is a selective catecholamine (norepinephrine and dopamine) reuptake inhibitor. It has only a small effect on serotonin reuptake. It does not inhibit MAO. The antidepressant effect of bupropion is considered to be mediated by its dopaminergic and noradrenergic action. Bupropion has also been shown to act as a competitive alpha-3-beta-4- nicotinic antagonist, the alpha-3-beta-4-antagonism has been shown to interrupt addiction in studies of other drugs such as ibogaine. This alpha-3-beta-4-antagonism correlates quite well with the observed effect of interrupting addiction. A unicyclic, aminoketone antidepressant. The mechanism of its therapeutic actions is not well understood, but it does appear to block dopamine uptake. The hydrochloride is available as an aid to smoking cessation treatment; Bupropion is a selective catecholamine (norepinephrine and dopamine) reuptake inhibitor. It has only a small effect on serotonin reuptake. It does not inhibit MAO. The antidepressant effect of bupropion is considered to be mediated by its dopaminergic and noradrenergic action. Bupropion has also been shown to act as a competitive alpha-3-beta-4-nicotinic antagonist, the alpha-3-beta-4-antagonism has been shown to interrupt addiction in studies of other drugs such as ibogaine. This alpha-3-beta-4-antagonism correlates quite well with the observed effect of interrupting addiction. Bupropion (amfebutamone) (brand names Wellbutrin and Zyban) is an antidepressant of the aminoketone class, chemically unrelated to tricyclics or selective serotonin reuptake inhibitors (SSRIs). It is similar in structure to the stimulant cathinone, and to phenethylamines in general. It is a chemical derivative of diethylpropion, an amphetamine-like substance used as an anorectic. Bupropion is both a dopamine reuptake inhibitor and a norepinephrine reuptake inhibitor. It is often used as a smoking cessation aid.
Hydroxybupropion is found in the bupropion degradation pathway. Bupropion reacts with NADPH and O2 to produce hydroxybupropion, with NADP+ and H2O as byproducts.
Fencamfamine (Glucoenergan, Reactivan) is a stimulant which was developed in the 1960s as an appetite suppressant, but was later withdrawn for this application due to problems with dependence and abuse. It is around half the potency of dexamphetamine, and is prescribed at a dose of 10-60mg, although abusers of the drug tend to rapidly develop tolerance and escalate their dose. Reactivan is still rarely used for treating depressive day-time fatigue, lack of concentration and lethargy, particularly in individuals who have chronic medical conditions, as its favourable safety profile makes it the most suitable drug in some cases. [Wikipedia]
meso-Pristane is found in fishes. meso-Pristane is isolated from fish liver oi
Humilixanthin is found in common beet. Iso. from the yellow-coloured root of beetroot Beta vulgaris.
Hexafluoroisopropanol is a metabolite of sevoflurane. Sevoflurane (1,1,1,3,3,3-hexafluoro-2-propane), also called fluoromethyl hexafluoroisopropyl ether, is a sweet-smelling, nonflammable, 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. It is often administered in a mixture of nitrous oxide and oxygen. After desflurane, it is the volatile anesthetic with the fastest onset and offset. (Wikipedia)
2-Amino-3,8-dimethyl-3H-imidazo[4,5-f]quinoxaline is found in animal foods. 2-Amino-3,8-dimethyl-3H-imidazo[4,5-f]quinoxaline is a food-related mutagen isolated from cooked meats (especially grilled/barbecued
1,3-Dimethyluracil is a methyl derivative of uric acid, found occasionally in human urine. 1,3-Dimethyluracil is one of the purine component 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. (PMID:11712316, 15833286, 3506820).
This compound belongs to the family of Pyrimidine Nucleotide Sugars. These are pyrimidine nucleotides bound to a saccharide derivative through the terminal phosphate group.
Pyrazinamide. Pyrazinamide is a drug used to treat tuberculosis in afflicted patients. The drug is largely bacteriostatic, but can be bacteriocidal on actively replicating tuberculosis bacteria. -- Wikipedia; Pyrazinamide is a generic drug and is available in a wide variety of presentations. Pyrazinamide tablets are usually 500mg and form the bulkiest part of the standard tuberculosis treatment regimen. Pyrazinamide tablets are so large that some patients find them impossible to swallow: pyrazinamide syrup is an option for these patients. -- Wikipedia; Pyrazinamide is also available as part of fixed dose combinations with other TB drugs such as isoniazid and rifampicin (Rifater is an example). -- Wikipedia; Pyrazinamide is well absorbed orally. It crosses inflamed meninges and is an essential part of the treatment of tuberculous meningitis. It is metabolised by the liver and the metabolic products are excreted by the kidneys. -- Wikipedia; Pyrazinamide is a pro-drug that stops the growth of Mycobacterium tuberculosis. M. tuberculosis has the enzyme pyrazinamidase which is only active at acidic pH. Pyrazinamidase converts pyrazinamide to the active form, pyrazinoic acid. Pyrazinoic acid inhibits the enzyme fatty acid synthetase I, which is required by the bacterium to synthesise fatty acids. Mutations of the pyrazinamidase gene (pncA) are responsible for pyrazinamide resistance in M. tuberculosis. -- Wikipedia.
Tymazoline is only found in individuals that have used or taken this drug. It is a nasal preparation.Thymazen causes vasoconstriction of the nasal mucosa, reducing congestion and thus the swelling of the mucosa. Also reduces the secretions from the nose. Thymazen acts on alpha-adrenergic receptors, which reduces local inflammation of the nasal mucosa especially if their cause is an allergy.
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.
16-o-methylcafestol, also known as 16-omc compound, is a member of the class of compounds known as naphthofurans. Naphthofurans are compounds containing a furan ring fused to a naphthalene moiety. Furan is a 5 membered- ring aromatic ring with four carbon and one oxygen atoms. Naphthalene is a polycyclic aromatic hydrocarbon made up of two fused benzene rings. 16-o-methylcafestol is practically insoluble (in water) and a very weakly acidic compound (based on its pKa). 16-o-methylcafestol can be found in arabica coffee, which makes 16-o-methylcafestol a potential biomarker for the consumption of this food product.
S-4-Hydroxymephenytoin is only found in individuals that have used or taken Mephenytoin. S-4-Hydroxymephenytoin is a metabolite of Mephenytoin. S-4-hydroxymephenytoin 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.
N-desmethyltoremifene is a metabolite of toremifene. Toremifene citrate is an oral selective estrogen receptor modulator (SERM) which helps oppose the actions of estrogen in the body. Licensed in the United States under the brand name Fareston, toremifene citrate is FDA-approved for use in advanced breast cancer. It is also being evaluated for prevention of prostate cancer under the brand name Acapodene. (Wikipedia)
(Chloromethyl)oxirane is used for cross-linking dextrose units in food starc
beta-Glycyrrhetinic acid is found in herbs and spices. beta-Glycyrrhetinic acid is a constituent of licorice (Glycyrrhiza glabra) root
Gypsogenin 3-O-b-D-glucuronide is found in fruits. Gypsogenin 3-O-b-D-glucuronide is a constituent of the famine food Momordica dioica.
Drospirenone is a synthetic progestin that is an analog to spironolactone. It is found in a number of birth control formulations. Drospirenone differs from other synthetic progestins in that its pharmacological profile in preclinical studies shows it to be closer to the natural progesterone. As such it has anti-mineralocorticoid properties, counteracts the estrogen-stimulated activity of the renin-angiotensin-aldosterone system, and is not androgenic.
Isopropyl hexadecanoate, also known as isopal or isopropyl palmitate, belongs to the class of organic compounds known as fatty acid esters. These are carboxylic ester derivatives of a fatty acid. Isopropyl hexadecanoate is a very hydrophobic molecule, practically insoluble in water, and relatively neutral.
Zafirlukast is an oral leukotriene receptor antagonist (LTRA) for the maintenance treatment of asthma, often used in conjunction with an inhaled steroid and/or long-acting bronchodilator. It is available as a tablet and is usually dosed twice daily. Another leukotriene receptor antagonist is montelukast (Singulair), which is usually taken just once daily. Zafirlukast blocks the action of the cysteinyl leukotrienes on the CysLT1 receptors, thus reducing constriction of the airways, build-up of mucus in the lungs and inflammation of the breathing passages.
Salsalate is a nonsteroidal anti-inflammatory agent for oral administration. Salsalate's mode of action as an anti-inflammatory and antirheumatic agent may be due to inhibition of synthesis and release of prostaglandins. The usefulness of salicylic acid, the active in vivo product of salsalate, in the treatment of arthritic disorders has been established. In contrast to aspirin, salsalate causes no greater fecal gastrointestinal blood loss than placebo. Salsalate is readily soluble in the small intestine where it is partially hydrolyzed to two molecules of salicylic acid. A significant portion of the parent compound is absorbed unchanged and undergoes rapid esterase hydrolysis in the body. The parent compound has an elimination half-life of about 1 hour. Salicylic acid (the active metabolite) biotransformation is saturated at anti-inflammatory doses of salsalate. Such capacity limited biotransformation results in an increase in the half-life of salicylic acid from 3.5 to 16 or more hours.
Dihydropteridine is a generic compound; the product of the reduction of 5,6,7,8-Tetrahydropteridine, which is catalyzed by 6,7-dihydropteridine reductase (EC 1.5.1.34). (KEGG) This compound is recognised as a cause of tetrahydrobiopterin (BH(4)) deficiency, leading to hyperphenylalaninemia (HPA) and impaired biogenic amine deficiency. (PMID: 14705166).
Anthelmintic, used in cattle, sheep and horse
Piroxicam is only found in individuals that have used or taken this drug. It is a cyclooxygenase inhibiting, non-steroidal anti-inflammatory agent (NSAID) that is well established in treating rheumatoid arthritis and osteoarthritis and used for musculoskeletal disorders, dysmenorrhea, and postoperative pain. Its long half-life enables it to be administered once daily. [PubChem]The antiinflammatory effect of Piroxicam may result from the reversible inhibition of cyclooxygenase, causing the peripheral inhibition of prostaglandin synthesis. The prostaglandins are produced by an enzyme called Cox-1. Piroxicam blocks the Cox-1 enzyme, resulting into the disruption of production of prostaglandins. Piroxicam also inhibits the migration of leukocytes into sites of inflammation and prevents the formation of thromboxane A2, an aggregating agent, by the platelets.
Cyanocobalamin (commonly known as Vitamin B12) is the most chemically complex of all the vitamins. Cyanocobalamin's structure is based on a corrin ring, which, although similar to the porphyrin ring found in heme, chlorophyll, and cytochrome, has two of the pyrrole rings directly bonded. The central metal ion is Co (cobalt). Cyanocobalamin cannot be made by plants or by animals, as the only type of organisms that have the enzymes required for the synthesis of cyanocobalamin are bacteria and archaea. Higher plants do not concentrate cyanocobalamin from the soil and so are a poor source of the substance as compared with animal tissues. Cyanocobalamin is naturally found in foods including meat (especially liver and shellfish), eggs, and milk products.
Loteprednol (as Loteprednol Etabonate) is a topical corticoid antiinflammatory. It is used in ophthalmic solution for the treatment of steroid responsive inflammatory conditions of the eye such as allergic conjunctivitis, uveitis, acne rosacea, superficial punctate keratitis, herpes zoster keratitis, iritis, cyclitis, and selected infective conjunctivitides. As a nasal spray, is used for the treatment and management of seasonal allergic rhinitis.
Isoleucyl-Isoleucine is a dipeptied compoosed of two isoleucine 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.
3,5,5-Trimethyl-2-cyclohexen-1-one is found in fruits. 3,5,5-Trimethyl-2-cyclohexen-1-one is a flavouring ingredient. 3,5,5-Trimethyl-2-cyclohexen-1-one is present in cranberries (Vaccinium microcarpa) and saffron (Crocus sativus
1,2-Diacylglycerol-LD-SM-pool is also known as 62Sm or Samario.    1,2-Diacylglycerol-LD-SM-pool can be found throughout numerous foods such as Brazil nuts, Spinachs, Red beetroots, and Black walnuts
Methylergonovine is only found in individuals that have used or taken this drug. It is a homolog of ergonovine containing one more CH2 group. (Merck Index, 11th ed)Methylergonovine acts directly on the smooth muscle of the uterus and increases the tone, rate, and amplitude of rhythmic contractions through binding and the resultant antagonism of the dopamine D1 receptor. Thus, it induces a rapid and sustained tetanic uterotonic effect which shortens the third stage of labor and reduces blood loss.
E-10-Hydroxyamitriptyline is only found in individuals that have used or taken Amitriptyline. E-10-Hydroxyamitriptyline is a metabolite of Amitriptyline. E-10-hydroxyamitriptyline belongs to the family of Dibenzocycloheptenes. These are compounds containing a dibenzocycloheptene moiety, which consists of two benzene connected by a cycloheptene ring.
Anofinic acid is found in mushrooms. Anofinic acid is a metabolite of Lactarius deliciosus.
Ercalcitriol is the active circulating metabolite of vitamin D2. Vitamin D2 is modified by 25-hydroxylase in the liver and 25-hydroxyvitamin D *-hydroxylase in the kidney to form the active metabolite, ercalcitriol, which is then metabolized by 25-hydroxyvitamin D-24-hydroxylase (24-OHase, CYP24A1, EC 1.14.13.13). The binding of ercalcitriol or their analogs to Vitamin D receptor (VDR), a nuclear receptor, activates VDR to interact with retinoid X receptor (RXR) and forms the VDR/RXR/cofactor complex, which binds to Vitamin D response elements in the promoter region of target genes to regulate gene transcription. The kidney is the major site of 25-hydroxyvitamin D*-hydroxylase (CYP27B1, EC 1.14.13.13), which is responsible for the activation of 25-hydroxyvitamin D. Of all the steroid hormones, ercalcitriol represents the most difficult challenge to the analytical biochemist with respect to quantization. Ercalcitriol circulates at pmol concentrations, is highly lipophilic and its precursor, 25-hydroxyvitamin D2, circulates at nmol levels. (PMID: 16242929, 17867378, 17197173).
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)
Alpha-Hydroxy-tamoxifen-O-glucuronide 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)
Euglobal Ia2 is a constituent of Eucalyptus globulus (tasmanian blue gum)
1-Pentanol, also known as butylcarbinol or 1-pentyl alcohol, belongs to the class of organic compounds known as primary alcohols. Primary alcohols are compounds comprising the primary alcohol functional group, with the general structure RCOH (R=alkyl, aryl). Thus, 1-pentanol is considered to be a fatty alcohol lipid molecule. 1-Pentanol is an organic compound with the formula C5H12O. 1-Pentanol is a very hydrophobic molecule, practically insoluble in water, and relatively neutral. All eight isomers of 1-Pentanol are known:; It is a colourless liquid of density 0.8247 g/cm3 (0 oC), boiling at 131.6 oC, slightly soluble in water, easily soluble in organic solvents. 1-Pentanol exists in all eukaryotes, ranging from yeast to humans. 1-Pentanol is a sweet, balsamic, and fusel tasting compound. 1-Pentanol can be found in a few different foods, such as black walnuts, common thymes, and tea and in a lower concentration in safflowers, highbush blueberries, and kohlrabis. 1-Pentanol has also been detected, but not quantified, in several different foods, such as corns, garden tomato (var.), allspices, cherry tomato, and evergreen blackberries. It possesses a characteristic strong smell and a sharp burning taste. The other amyl alcohols may be obtained synthetically. It is a solid that melts at 48 to 50 °C and boils at 112.3 °C. On passing its vapour through a red-hot tube, it decomposes with production of acetylene, ethylene, propylene, and other compounds. Of these, tertiary 1-Pentanol has been the most difficult to obtain, its synthesis having first been reported in 1891, by L. Tissier (Comptes Rendus, 1891, 112, p. 1065) by the reduction of a mixture of trimethyl acetic acid and trimethylacetyl chloride with sodium amalgam. It is oxidized by chromic acid to isovaleraldehyde, and it forms crystalline addition compounds with calcium chloride and tin(IV) chloride. When pure, it is nontoxic, while the impure product is toxic.
5-Hydroxyindoleacetic acid, also known as 5-hydroxyindole-3-acetate or 5-HIAA, belongs to the class of organic compounds known as indole-3-acetic acid derivatives. Indole-3-acetic acid derivatives are compounds containing an acetic acid (or a derivative) linked to the C3 carbon atom of an indole. 5-Hydroxyindoleacetic acid exists in all living organisms, ranging from bacteria to humans. In humans, 5-hydroxyindoleacetic acid is a breakdown product of serotonin that is excreted in the urine and it also participates in a number of enzymatic reactions. 5-hydroxyindoleacetic acid can be biosynthesized from 5-hydroxyindoleacetaldehyde; which is catalyzed by the mitochondrial enzyme aldehyde dehydrogenase. In addition, 5-hydroxyindoleacetic acid and S-adenosylmethionine can be converted into 5-methoxyindoleacetate and S-adenosylhomocysteine through its interaction with the enzyme acetylserotonin O-methyltransferase. 5-Hydroxyindoleacetic acid is also involved in the metabolism of tryptophan. 5-Hydroxyindoleacetic acid has been found to be associated with several human diseases such as brunner syndrome, friedreich's ataxia, schizophrenia, and olivopontocerebral atrophy; 5-hydroxyindoleacetic acid has also been linked to the inborn metabolic disorder sepiapterin reductase deficiency. Elevated levels of 5-hydroxyindoleacetic acid in urine (>20 uM) are indicative of appendicitis and gastroenteritis (PMID: 11462886). Serotonin and 5-Hydroxyindoleacetic acid are produced in excess amounts by carcinoid tumors, and levels of these substances may be measured in the urine to test for carcinoid tumors (NCI). 5-Hydroxyindoleacetic acid has also been found to be a product of human gut microbiota.
Laccarin is found in mushrooms. Laccarin is an alkaloid from fruit bodies of the mushroom Laccaria vinaceoavellanea.
Antimicrobial agent used in cheese and other foods
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).
Pheniramine is only found in individuals that have used or taken this drug. It is one of the histamine H1 antagonists with little sedative action. It is used in treatment of hay fever, rhinitis, allergic dermatoses, and pruritus. [PubChem]Antihistamines such as pheniramine 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. Antihistamines suppress the histamine-induced wheal (swelling) and flare (vasodilation) response by blocking the binding of histamine to its receptors on nerves, vascular smooth muscle, glandular cells, endothelium, and mast cells. They effectively exert competitive antagonism of histamine for H1-receptors.
Sulfinpyrazone sulfide is a metabolite of sulfinpyrazone. Sulfinpyrazone is a uricosuric medication used to treat gout. It also sometimes is used to reduce platelet aggregation by inhibiting degranulation of platelets which reduces the release of ADP and thromboxane. Like other uricosurics, sulfinpyrazone works by competitively inhibiting uric acid reabsorption in the proximal tubule of the kidney. (Wikipedia)
Sulfinpyrazone sulfone is a metabolite of sulfinpyrazone. Sulfinpyrazone is a uricosuric medication used to treat gout. It also sometimes is used to reduce platelet aggregation by inhibiting degranulation of platelets which reduces the release of ADP and thromboxane. Like other uricosurics, sulfinpyrazone works by competitively inhibiting uric acid reabsorption in the proximal tubule of the kidney. (Wikipedia)
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.
17-phenyl-18,19,20-trinor-prostaglandin E2, also known as 17-Phenyl-omega-trinor-pge2 or CL 116147, is classified as a member of the Prostaglandins and related compounds. Prostaglandins and related compounds are unsaturated carboxylic acids consisting of a 20 carbon skeleton that also contains a five member ring, and are based upon the fatty acid arachidonic acid. 17-phenyl-18,19,20-trinor-prostaglandin E2 is considered to be practically insoluble (in water) and acidic.  17-phenyl-18,19,20-trinor-prostaglandin E2 is an eicosanoid lipid molecule
5-Hydroxymethyl-6-methyl- 2,4-(1H,3H)-pyrimidinedione. Uracil derivative used in combination with toxic antibiotics to lessen their toxicity; also to stimulate leukopoiesis and immunity.
Paliperidone is the primary active metabolite of the older antipsychotic risperidone. While its specific mechanism of action is unknown, it is believed that paliperidone and risperidone act via similar if not the same pathways. It has been proposed that the drug's therapeutic activity in schizophrenia is mediated through a combination of central dopamine Type 2 (D2) and serotonin Type 2 (5HT2A) receptor antagonism. Paliperidone is also active as an antagonist at alpha 1 and alpha 2 adrenergic receptors and H1 histaminergic receptors, which may explain some of the other effects of the drug. Paliperidone was approved by the FDA for treatment of schizophrenia on December 20, 2006.
Acetylisoniazid belongs to the family of Pyridinecarboxamides. These are compounds containing a pyridine ring bearing a carboxamide.
Tetrahydrocorticosterone 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, tetrahydrocorticosterone is considered to be a steroid lipid molecule. Tetrahydrocorticosterone is a very hydrophobic molecule, practically insoluble (in water), and relatively neutral. Tetrahydrocorticosterone is one of the major urinary metabolites from corticosterone. Premenopausal patients with early breast cancer excrete subnormal amounts of tetrahydrocorticosterone as compared with the normal subjects of corresponding ages (PMID: 1133844).
5a-tetrahydrocorticosterone is highly sensitive to adrenocorticotropic hormone (ACTH) secretion. High levels of 5a-Tetrahydrocorticosterone are a warning sign of hypertension. (PMID: 16597193,7473516).
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.
Detoxification of cyclophosphamide is effected, in part, by hepatic class 1 aldehyde dehydrogenase (ALDH-1)-catalyzed oxidation of aldophosphamide, a pivotal aldehyde intermediate, to the nontoxic metabolite, carboxyphosphamide. Detoxification of aldophosphamide may also be effected by enzymes, viz. Thus, NAD-linked oxidation and NADPH-linked reduction of aldophosphamide catalyzed by relevant erythrocyte enzymes were quantified. (PMID: 9394035) Class 1 aldehyde dehydrogenases (ALDH-1) function as drug resistance gene products by catalyzing the irreversible conversion of aldophosphamide, an active metabolite of cyclophosphamide, to an inert compound. (PMID: 9322086)
Dimethicone, also known as ((CH3)3Si)2O or HMDSO, belongs to the class of organic compounds known as disiloxanes. These are organosilicon compounds with the general formula H[Si](R)(R')O[Si](H)(R'')R''' (R= organyl, R'-R'''= H or organyl). Dimethicone is found, on average, in the highest concentration within a few different foods, such as carobs, lettuces, and common salsifies. Dimethicone has also been detected, but not quantified, in several different foods, such as black walnuts, sweet bay, asparagus, ceylon cinnamons, and hyssops. This could make dimethicone a potential biomarker for the consumption of these foods. An organosiloxane consisting of two trimethylsilyl groups covalently bound to a central oxygen.
lo
Carbohydrate antigen which is accumulated in various human cancer tissues and secreted into the blood stream. The carbohydrate moiety can be further modified with fucose or sialic acid. Monoclonal antibodies have been determined which can discriminate each subgroup of this antigen in the sera of cancer patients. Sialyl SSEA-1 antigen is particularly elevated in the sera of patients with a variety of tumors.
Cyclamic acid is an artificial sweetening agent, usually employed as Na or Ca salt (cyclamate). Use suspended in some countries, including USA, because of possible weak carcinogenic activity (disputed). Cyclamic acid is a permitted in EU at levels of 250-1600 ppm in food products.Cyclamic acid is a compound with formula C6H11NHSO2OH
Nonanal, also known as nonyl aldehyde or pelargonaldehyde, belongs to the class of organic compounds known as medium-chain aldehydes. These are an aldehyde with a chain length containing between 6 and 12 carbon atoms. Thus, nonanal is considered to be a fatty aldehyde lipid molecule. Nonanal acts synergistically with carbon dioxide in that regard. Nonanal is a very hydrophobic molecule, practically insoluble in water, and relatively neutral. Nonanal exists in all eukaryotes, ranging from yeast to humans. Nonanal is an aldehydic, citrus, and fat tasting compound. nonanal is found, on average, in the highest concentration in a few different foods, such as corns, tea, and gingers and in a lower concentration in sweet oranges, carrots, and limes. nonanal has also been detected, but not quantified, in several different foods, such as olives, cereals and cereal products, chinese cinnamons, common grapes, and oats. This could make nonanal a potential biomarker for the consumption of these foods. Nonanal has been identified as a compound that attracts Culex mosquitoes. Nonanal is a potentially toxic compound. Nonanal has been found to be associated with several diseases such as pervasive developmental disorder not otherwise specified, autism, crohn's disease, and ulcerative colitis; also nonanal has been linked to the inborn metabolic disorders including celiac disease. Nonanal, also called nonanaldehyde, pelargonaldehyde or Aldehyde C-9, is an alkyl aldehyde. Although it occurs in several natural oils, it is produced commercially by hydroformylation of 1-octene. A colourless, oily liquid, nonanal is a component of perfumes.
Tyromycic acid is found in mushrooms. Tyromycic acid is a constituent of Ganoderma lucidum (reishi)
2-Methyl-3-ketovaleric acid is a metabolite of beta-leucine in the beta-keto pathway of leucine metabolism. 2-Methyl-3-ketovaleric acid is a known pathological metabolite and associated with propionic acidemia, especially during periods of ketoacidosis; a severe deficiency of propionyl-CoA carboxylase in cultured fibroblasts has been detected in some neonatal cases. (PMID 7389125, 6820422, 7119896, 7430116, 3356699). 2-Methyl-3-ketovaleric acid induces a strong activity of inosine-5'-monophosphate dehydrogenase (IMPDH; the rate-limiting enzyme in GTP synthesis), mimicking glucose. (PMID: 11145582).
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.
Isotetrandrine is found in herbs and spices. Isotetrandrine is an alkaloid from Laurelia sempervirens (Peruvian nutmeg
Erythrosine is a dye used in food and feed additives. Prohibited in U.S.A. and Norway Erythrosine is a cherry-pink synthetic fluorone food coloring. It is the disodium salt of 2,4,5,7-tetraiodofluorescein. Its maximum absorbance is at 530 nm in an aqueous solution, and it is subject to photodegradation.[citation needed]; It is used as a food coloring, in printing inks, as a biological stain, a dental plaque disclosing agent and a radiopaque medium. It is commonly used in sweets and foods marketed to children such as cake icing and cake-decorating gels. It is also used to color pistachio shells. While commonly used in most countries of the world, erythrosine is rarely used in the United States due to its known hazards, with Allura Red AC (Red #40) being generally used instead. However, Allura Red AC is banned in many European countries because it is an azo dye, despite the fact that it has fewer known health risks than Erythrosine
Isoprothiolane is an Agricultural fungicide for rice crop
Furazolidone is a nitrofuran derivative with antiprotozoal and antibacterial activity. Furazolidone has been shown to exhibit antibiotic and anti-microbial functions (PMID 1476092, 6651278). Furazolidone is also used as a poultry food additive. It is marketed by Roberts Laboratories under the brand name Furoxone and by GlaxoSmithKline as Dependal-M. Furoxone has a broad antibacterial spectrum covering the majority of gastrointestinal tract pathogens including E. coli, staphylococci, Salmonella, Shigella, Proteus, Aerobacter aerogenes, Vibrio cholerae and Giardia lamblia. Its bactericidal activity is based upon its interference with DNA replication and protein production. Furazolidone binds bacterial DNA which leads to the gradual inhibition of monoamine oxidase (From Martindale, The Extra Pharmacopoeia, 30th ed, p514). Furazolidone and its related free radical products are believed to bind DNA and induce cross-links. Bacterial DNA is particularly susceptible to this drug leading to high levels of mutations (transitions and transversions) in the bacterial chromosome. Furazolidone belongs to the family of Nitrofurans. These are compounds containing a furan ring which bears a nitro group.
Rolitetracycline is only found in individuals that have used or taken this drug. It is a pyrrolidinylmethyl tetracycline.Rolitetracycline is a semisynthetic broad-spectrum tetracycline antibiotic used especially for parenteral administration in cases requiring high concentrations or when oral administration is impractical. Rolitetracycline passively diffuses through porin channels in the bacterial membrane and reversibly binds to the 30S ribosomal subunit, preventing binding of tRNA to the mRNA-ribosome complex, and thus interfering with protein synthesis.
Adenosine 5' tetraphosphate, Ap4, is a natural nucleotide present in many biological systems. This nucleotide has been found as a constituent of the nucleotide pool present in the aqueous humor of a number of mammals and appears to act as a regulator of intraocular pressure (PMID: 14600249). AP4 may also play a significant role in the physiological regulation of vascular tone (PMID: 8599250). The plasma concentration of AP4 is in the nanomolar range. Technically adenosine tetraphosphate is condensation product of adenosine with tetraphosphoric acid at the 5' position. Acetyl coenzyme A (CoA) synthetase (EC 6.2.1.1) catalyzes the synthesis of adenosine 5'-tetraphosphate (P4A) and adenosine 5'-pentaphosphate (p5A) from ATP and tri- or tetrapolyphosphate (P3 or P4).
Trans-1,2-Dihydrobenzene-1,2-diol is an intermediate in the metabolism of Prostaglandin and leukotriene. It is a substrate for Aldo-keto reductase family 1 member C3, Aldo-keto reductase family 1 member C4, Aldo-keto reductase family 1 member C2 and Aldo-keto reductase family 1 member C1.
4-Oxoretinal is a predominant retinoids during morphogenesis in mouse skin in vivo. Topical 4-oxoretinal and 4-oxoretinol promoted significant epidermal hyperplasia and metaplasia in mouse tail. They induced a moderate response for epidermal inflammation, compared with retinal, whereas neither 4-oxoretinal nor 4-oxoretinol prevented menadione-induced epidermal lipid peroxidation, unlike retinal and retinol. As analyzed by quantitative PCR, 4-oxoretinal and 4-oxoretinol did not reproduce the significant increased expression of genes coding for keratin 4, amphiregulin, heparin-EGF and CYP26A1, that did induce retinal and retinol. However, both retinal and 4-oxoretinal significantly inhibited the lipopolysaccharide-induced maturation of human dendritic cells in vitro. As analyzed in vivo and in vitro, 4-oxoretinal and 4-oxoretinol were not converted into retinoic acid. We conclude that 4-oxoretinal and 4-oxoretinol exert a moderate direct retinoid-like activity in vivo, thus confirming previous in vitro studies in amphibians showing 4-oxometabolites of vitamin A as bioactive agents rather than inactive catabolites.
6-acetylmorphine belongs to the family of Morphinans. These are polycyclic compounds with a four-ring skeleton with three condensed six-member rings forming a partially hydrogenated phenanthrene moiety, one of which is aromatic while the two others are alicyclic.
2,3,4,5,6-Pentachlorobenzyl alcohol is a fungicide. Effective against foliar-blast disease of rice caused by Pyricularia oryzae, Drechslera oryzae and Rhizoctonia solani.
3-Hydroxymethylantipyrine is a metabolite of Antipyrine. 3-hydroxymethylantipyrine belongs to the family of Anilides. These are organic compounds derived from oxoacids RkE(=O)l(OH)m by replacing an OH group by the NHPh group or derivative formed by ring substitution.
Colour additive for food
Isoetharine is only found in individuals that have used or taken this drug. It is a selective adrenergic beta-2 agonist used as fast acting bronchodilator for emphysema, bronchitis and asthma. [PubChem]The pharmacologic effects of isoetharine are attributable to stimulation through beta-adrenergic receptors of intracellular adenyl cyclase, the enzyme that catalyzes the conversion of adenosine triphosphate (ATP) to cyclic AMP. Increased cyclic AMP levels are associated with relaxation of bronchial smooth muscle and inhibition of release of mediators of immediate hypersensitivity from cells, especially from mast cells.
Novobiocin is only found in individuals that have used or taken this drug. It is an antibiotic compound derived from Streptomyces niveus. It has a chemical structure similar to coumarin. Novobiocin binds to DNA gyrase, and blocks adenosine triphosphatase (ATPase) activity. (From Reynolds, Martindale The Extra Pharmacopoeia, 30th ed, p189) [PubChem]Novobiocin is an aminocoumarin. Aminocoumarins are very potent inhibitors of bacterial DNA gyrase and work by inhibiting the GyrB subunit of the enzyme involved in energy tranduction. Novobiocin as well as the other aminocoumarin antibiotics act as competitive inhibitors of the ATPase reaction catalysed by GyrB.
Kanamycin is only found in individuals that have used or taken this drug. It is an antibiotic complex produced by Streptomyces kanamyceticus from Japanese soil. Comprises 3 components: kanamycin A, the major component, and kanamycins B and C, the minor components. [PubChem]Aminoglycosides like kanamycin "irreversibly" bind to specific 30S-subunit proteins and 16S rRNA. Specifically Kanamycin binds to four nucleotides of 16S rRNA and a single amino acid of protein S12. This interferes with decoding site in the vicinity of nucleotide 1400 in 16S rRNA of 30S subunit. This region interacts with the wobble base in the anticodon of tRNA. This leads to interference with the initiation complex, misreading of mRNA so incorrect amino acids are inserted into the polypeptide leading to nonfunctional or toxic peptides and the breakup of polysomes into nonfunctional monosomes.
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)
N-[2-(3,4-Dimethoxyphenyl)ethyl]-3,4-dimethoxycinnamic acid amide is used as a food additive [EAFUS] ("EAFUS: Everything Added to Food in the United States. [http://www.eafus.com/]")
A centrally acting antihypertensive agent. The drug lowers both systolic and diastolic blood pressure by activating the central nervous system alpha-2 adrenoreceptors, which results in reduced sympathetic outflow leading to reduced vascular tone. Its adverse reactions include dry mouth, sedation, and constipation. [PubChem]
Droxidopa is a precursor of noradrenaline that is used in the treatment of Parkinsonism. It is approved for use in Japan and is currently in trials in the U.S. The racaemic form (dl-threo-3,4-dihydroxyphenylserine) has also been used, and has been investigated in the treatment of orthostatic hypotension. There is a deficit of noradrenaline as well as of dopamine in Parkinson's disease and it has been proposed that this underlies the sudden transient freezing seen usually in advanced disease.
Neosaxitoxin is produced by Protogonyaulax and found in shellfis
Cefuroxime is only found in individuals that have used or taken this drug. It is a broad-spectrum cephalosporin antibiotic resistant to beta-lactamase. It has been proposed for infections with gram-negative and gram-positive organisms, gonorrhea, and haemophilus. [PubChem]Cefuroxime, like the penicillins, is a beta-lactam antibiotic. By binding to specific penicillin-binding proteins (PBPs) located inside the bacterial cell wall, it 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 cefuroxime interferes with an autolysin inhibitor.
Bisnorcholic acid is one of a number of short side bile acids found in the urine from patients with cerebrotendinous xanthomatosis (CTX). The presence these short side bile acids in urine of the CTX patients suggests that bile alcohols may be further degraded to these bile acids. (PMID: 2079611).
Ganglioside GM3 (d18:1/18:0) 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 GM3 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 tissuesGangliosides are glycosphingolipids. There are four types of glycosphingolipids, the cerebrosides, sulfatides, globosides and gangliosides. Gangliosides are very similar to globosides except that they also contain N-acetyl neuraminic acid (NANA) in varying amounts. The specific names for the gangliosides provide information about their structure. The letter G refers to ganglioside, and the subscripts M, D, T and Q indicate that the molecule contains mono-, di-, tri and quatra-sialic acid. The numbered subscripts 1, 2 and 3 refer to the carbohydrate sequence that is attached to the ceramide. In particular, 1 stands for GalGalNAcGalGlc-ceramide, 2 stands for GalNAcGalGlc-ceramide and 3 stands for GalGlc-ceramide. Deficiencies in lysosomal enzymes that degrade the carbohydrate portions of various gangliosides are responsible for a number of lysosomal storage diseases such as Tay-Sachs disease, Sandhoff disease, and GM1 gangliosidosis. The carbohydrate portion of the ganglioside GM1 is the site of attachment of cholera toxin, the protein secreted by Vibrio cholerae.
Chorismic acid, more commonly known as its anionic form chorismate, is an important biochemical intermediate in plants and microorganisms. It is a precursor for the aromatic amino acids phenylalanine and tyrosine,indole, indole derivatives and tryptophan,2,3-dihydroxybenzoic acid (DHB) used for enterobactin biosynthesis,the plant hormone salicylic acid and many alkaloids and other aromatic metabolites. -- Wikipedia.
Chymopapain is found in fruits. Chymopapain is isolated from Carica papaya (papaya
Penciclovir is only found in individuals that have used or taken this drug. It is a guanine analogue antiviral drug used for the treatment of various herpesvirus infections. It is a nucleoside analogue which exhibits low toxicity and good selectivity. [Wikipedia]Penciclovir has <i>in vitro</i> activity against herpes simplex virus types 1 (HSV-1) and 2 (HSV-2). In cells infected with HSV-1 or HSV-2, viral thymidine kinase phosphorylates penciclovir to a monophosphate form. The monophosphate form of the drug is then converted to penciclovir triphosphate by cellular kinases. The intracellular triphosphate of penciclovir is retained <i>in vitro</i> inside HSV-infected cells for 10-20 hours, compared with 0.7-1 hour for acyclovir. <i>in vitro</i> studies show that penciclovir triphosphate selectively inhibits viral DNA polymerase by competing with deoxyguanosine triphosphate. Inhibition of DNA synthesis of virus-infected cells inhibits viral replication. In cells not infected with HSV, DNA synthesis is unaltered. Resistant mutants of HSV can occur from qualitative changes in viral thymidine kinase or DNA polymerase. The most commonly encountered acyclovir-resistant mutants that are deficient in viral thymidine kinase are also resistant to penciclovir.
Sarafloxacin is used for control of Campylobacter infections in poultr
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
2,4-toluenediamine belongs to the family of Toluenes. These are compounds containing a benzene ring which bears a methane group.
2,6-Pipecoloxylidide is a metabolite of bupivacaine. Bupivacaine is a local anaesthetic drug belonging to the amino amide group. It is commonly marketed under various trade names, including Marcain, Marcaine (CareStream Dental), Sensorcaine (Astra Zeneca) and Vivacaine (Septodont). (Wikipedia)
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)
L-2-Aminoethyl seryl phosphate is found in animal foods. L-2-Aminoethyl seryl phosphate is isolated from numerous animals including chicken, fish and reptile
Epitestosterone Sulfate is a sulfate conjugate of endogenous steroids hormone epitestosterone produced by both sexes and was determined using LC-MS/MS.
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).
Tetrahydrocorticosterone 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, tetrahydrocorticosterone is considered to be a steroid lipid molecule. Tetrahydrocorticosterone is a very hydrophobic molecule, practically insoluble (in water), and relatively neutral. Tetrahydrocorticosterone is one of the major urinary metabolites from corticosterone. Premenopausal patients with early breast cancer excrete subnormal amounts of tetrahydrocorticosterone as compared with the normal subjects of corresponding ages (PMID: 1133844).
m-Dichlorobenzene belongs to the family of Chlorobenzenes. These are compounds containing a chlorine atom attached to a benzene moiety
Pentanenitrile is found in brassicas. Pentanenitrile is a constituent of various Brassica species.
13-Hydroxyoctadecadienoic acid (13-HODE) (CAS: 18104-45-5), also known as 13(S)-hydroxy-9Z,11E-octadecadienoic acid or 13(S)-HODE, is the major lipoxygenation product synthesized in the body from linoleic acid. 13-HODE prevents cell adhesion to endothelial cells and can inhibit cancer metastasis. 13-HODE synthesis is enhanced by cyclic AMP. gamma-Linolenic acid, a desaturated metabolite of linoleic acid, causes substantial stimulation of 13-HODE synthesis. A fall in gamma-linolenic acid synthesis with age may be related to the age-related fall in 13-HODE formation (PMID: 9561154). 13-HODE is considered an intermediate in linoleic acid metabolism. It is generated from 13(S)-HPODE via the enzyme lipoxygenase (EC 1.13.11.12). 13-HODE has been shown to be involved in cell proliferation and differentiation in a number of systems. 13-HODE is found to be produced by prostate tumours and cell lines and researchers believe that there is a link between linoleic acid metabolism and the development or progression of prostate cancer (PMID: 9367845).
Stabiliser, emulsifier, thickener, formulation aid [DFC]. The chemical compound sodium alginate is the sodium salt of alginic acid. Sodium alginate is a gum, extracted from the cell walls of brown algae. As a flavorless gum, it is used by the foods industry to increase viscosity and as an emulsifier. As a food additive, sodium alginate is used especially in the production of gel-like foods. For example, bakers' Chellies are often gelled alginate jam. [Wikipedia]
Maltotriose is a trisaccharide (three-part sugar) consisting of three glucose molecules linked with α-1,4 glycosidic bonds. It is most commonly produced by the digestive enzyme alpha-amylase (a common enzyme in human saliva) on amylose in starch. The creation of both maltotriose and maltose during this process is due to the random manner in which alpha amylase hydrolyses α-1,4 glycosidic bonds. It is the shortest chain oligosaccharide that can be classified as maltodextrin. Maltotriose belongs to the class of organic compounds known as oligosaccharides. These are carbohydrates made up of 3 to 10 monosaccharide units linked to each other through glycosidic bonds. Maltotriose is a common oligosaccharide metabolite found in human urine after maltose ingestion or infusion (PMID:6645121). Maltotriose is increased in glycogen storage disease II (OMIM: 232300) due to a mutation of the enzyme alpha-1,4-glucosidase (EC 3.2.1.20) (PMID:4286143).
4-Pyridoxolactone is a bacterial oxidation metabolite of vitamin B6 (KEGG).
4-hydroxystyrene occurs frequently in different ciders, wines, foods and berries, e.g. cloudberry. Styrene is a prohapten metabolized in the skin by aryl hydrocarbon hydroxylase (AHH, EC 1.14.14.1) to styrene epoxide acting as the true hapten. Styrene occurs in nature and as a synthetic product.(PMID: 6713846).
3,5-Diiodothyronine, also known as 3,5-T2, belongs to the class of organic compounds known as phenylalanines and derivatives. Phenylalanine and derivatives 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. It is also a member of the class of compounds known as iodothyronines. Iodothyronines are phenolic amino acids with iodine substituents. 3,5-Diiodothyronine is a metabolite of the two main thyroid hormones T3 and T4 (thyroxine and triiodo-L-thyronine). It is a biologically active iodothyronine with mitochondria and bioenergetic mechanisms being the major targets of 3,5-T2. Nanomolar concentrations of 3,5-T2 significantly increases cytochrome oxidase (COX) activity (PMID: 30090086). It increases COX activity by preventing the interaction of adenosine triphosphate (ATP) as an allosteric inhibitor. At 1 pM concentration, 3,5-T2 stimulates oxygen consumption more rapidly than thyroxine (T3). A case report involving two human participants revealed that administration of 3,5-T2 to humans (1‚Äì5 ug/kg BW) rapidly (after 4‚Äì6 h) increased resting metabolic rate. Chronic 3,5-T2 administration (28 days, approximately 5 ug/kg BW) increased resting metabolic rate by approximately 15% and decreased body weight by approximately 4 kg in both participants (PMID: 22217997). 3,5-T2 stimulates the thyroid receptor (TR)-beta receptor for thyroid hormones and thus increases energy expenditure. It has agonistic (thyromimetic) effects on myocardial tissue and on the pituitary, which results in 3,5-T2 suppressing thyroid stimulating hormone release.
Constituent of Vicia faba. Fabatin is found in broad bean.
2,5-Dimethyl-2,4-hexadiene belongs to the class of organic compounds known as alkadienes. These are hydrocarbons that contain exactly two carbon-to-carbon double bonds.
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).
Selective pre- and post-emergence herbicide. Acifluorfen is used on soybeans and peanuts.
Casimiroin is found in pomes. Casimiroin is an alkaloid from the seed and bark of Casimiroa edulis (Mexican apple).
Astemizole is a long-acting, non-sedating second generation antihistamine used in the treatment of allergy symptoms. It was withdrawn from market by the manufacturer in 1999 due to the potential to cause arrhythmias at high doses, especially when when taken with CYP inhibitors or grapefruit juice.
Oleuropein is found in fruits. Oleuropein is a bitter principle of olives. Nutriceutical with antioxidant properties.Oleuropein is a chemical compound found in olive leaf from the olive tree (and leaves of privet) together with other closely related compounds such as 10-hydroxyoleuropein, ligstroside, and 10-hydroxyligstroside. All these compounds are tyrosol esters of elenolic acid that are further hydroxylated and glycosylated. Oleuropein and its metabolite hydroxytyrosol have powerful antioxidant activity both in vivo and in vitro and give extra-virgin olive oil its bitter, pungent taste. Oleuropein preparations have been claimed to strengthen the immune system
Octreotide is only found in individuals that have used or taken this drug. It is the acetate salt of a cyclic octapeptide. It is a long-acting octapeptide with pharmacologic properties mimicking those of the natural hormone somatostatin.Octreotide binds to somatostatin receptors. These receptors are coupled via pertussis toxin sensitive G proteins which lead to inhibition of adenylyl cyclase. Octreotide binding to these receptors also stimulates phosphotyrosine phosphatase and activation of the Na(+)/H(+) exchanger via pertussis toxin insensitive G proteins.
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).
Dulxanthone E is found in fruits. Dulxanthone E is a constituent of Garcinia dulcis (mundu).
Pravastatin is a member of the drug class of statins, used for lowering cholesterol and preventing cardiovascular disease. Pravastatin was identified originally in a mold called Nocardia autotrophica by researchers of the Sankyo Pharma Inc; An antilipemic fungal metabolite isolated from cultures of Nocardia autotrophica. It acts as a competitive inhibitor of HMG CoA reductase (hydroxymethylglutaryl CoA reductases); In medicine and pharmacology, pravastatin (Pravachol or Selektine) is a member of the drug class of statins, used for lowering cholesterol and preventing cardiovascular disease.
Reboxetine is an antidepressant drug used in the treatment of clinical depression, panic disorder and ADD/ADHD. Its mesylate (i.e. methanesulfonate) salt is sold under tradenames including Edronax, Norebox, Prolift, Solvex, Davedax or Vestra. Reboxetine has two chiral centers, but it only exists as two enantiomers, (R,R)-(-)- and (S,S)-(+)-reboxetine.
Phenylpropanolamine is a sympathomimetic that acts mainly by causing release of norepinephrine but also has direct agonist activity at some adrenergic receptors. It is most commonly used as a nasal vasoconstrictor and an appetite depressant. -- Pubchem.
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).
Nivalenol is a trichothecene produced by Fusaria, Stachybotrys, Trichoderma and other fungi, and some higher plants. They may contaminate food or feed grains, induce emesis and hemorrhage in lungs and brain, and damage bone marrow due to protein and DNA synthesis inhibition.(PubChem). It has been reported in the urine of patients suffering chronic idiopathic spastic paraparesis. These patients are usually found in hot and humid regions, most of which have heavy rains, and these conditions allow foods to be polluted by fungi some of which become toxigenic (PubMed ID 8855894 ).
Gingerol, a plant polyphenol, is the active constituent of fresh ginger. Chemically, gingerol is a relative of capsaicin, the compound that gives chile peppers their spiciness. It is normally found as a pungent yellow oil, but also can form a low-melting crystalline solid.
Hydroxytyrosol is a polyphenol extracted from virgin olive oil and a natural antioxidant. It has a protective effect in preventing protein damage induced by ultraviolet radiation (PMID: 15749387). Research results suggest that Hydroxytyrosol could exert its antioxidant effect by scavenging hydrogen peroxide but not superoxide anion released during the respiratory burst (PMID: 15476671). Hydroxytyrosol has been found to be a metabolite of Escherichia (PMID: 22948011).
Arbekacin is only found in individuals that have used or taken this drug. It is an semisynthetic aminoglycoside antibiotic. Often used for treatment of multi-resistant bacterial infection such as methicillin-resistant Staphylococcus aureus (MRSA). Amikacin is also nephrotoxic and ototoxic.Aminoglycosides, such as Arbekacin, inhibit protein synthesis in susceptible bacteria by irreversibly binding to bacterial 30S and 16S ribosomal subunits. Specifically Arbekacin binds to four nucleotides of 16S rRNA and a single amino acid of protein S12. This interferes with decoding site in the vicinity of nucleotide 1400 in 16S rRNA of 30S subunit. This region interacts with the wobble base in the anticodon of tRNA. This leads to misreading of mRNA so incorrect amino acids are inserted into the polypeptide leading to nonfunctional or toxic peptides and the breakup of polysomes into nonfunctional monosomes.
Pethidine (INN) or meperidine hydrochloride (USAN) (commonly referred to as Demerol in the US but also referred to as: isonipecaine; lidol; pethanol; piridosal; Algil; Alodan; Centralgin; Dispadol; Dolantin; Mialgin (in Indonesia); Petidin Dolargan (in Poland); Dolestine; Dolosal; Dolsin; Mefedina) is a fast-acting opioid analgesic drug. Pethidine is quickly hydrolysed in the liver to pethidinic acid and is also demethylated to norpethidine, which has half the analgesic activity of pethidine but a longer elimination half-life (8-12 hours); accumulating with regular administration, or in renal failure. Norpethidine is toxic and has convulsant and hallucinogenic effects. The toxic effects mediated by the metabolites cannot be countered with opioid receptor antagonists such as naloxone or naltrexone and are probably primarily due to norpethidine's anticholinergic activity probably due to its structural similarity to atropine though its pharmacology has not been thoroughly explored. The neurotoxicity of pethidine's metabolites is a unique feature of pethidine compared to other opioids. Pethidine's metabolites are further conjugated with glucuronic acid and excreted into the urine.
Flavouring agent and enhancer
Isorhamnetin is the methylated metabolite of quercetin. Quercetin is an important dietary flavonoid with in vitro antioxidant activity. However, it is found in human plasma as conjugates with glucuronic acid, sulfate or methyl groups, with no significant amounts of free quercetin present. Isorhamnetin prevents endothelial cell injuries from oxidized LDL via inhibition of lectin-like ox-LDL receptor-1 upregulation, interference of ox-LDL-mediated intracellular signaling pathway (p38MAPK activation, NF-kappaB nuclear translocation, eNOS expression) and the antioxidant activity of isorhamnetin. Isorhamnetin prevents endothelial dysfunction, superoxide production, and overexpression of p47phox induced by angiotensin II. Isorhamnetin appears to be a potent drug against esophageal cancer due to its in vitro potential to not only inhibit proliferation but also induce apoptosis of Eca-109 cells. (PMID: 15493462, 17368593, 17374653, 16963021).
Isorhamnetin is the methylated metabolite of quercetin. Quercetin is an important dietary flavonoid with in vitro antioxidant activity. However, it is found in human plasma as conjugates with glucuronic acid, sulfate or methyl groups, with no significant amounts of free quercetin present. Isorhamnetin prevents endothelial cell injuries from oxidized LDL via inhibition of lectin-like ox-LDL receptor-1 upregulation, interference of ox-LDL-mediated intracellular signaling pathway (p38MAPK activation, NF-kappaB nuclear translocation, eNOS expression) and the antioxidant activity of isorhamnetin. Isorhamnetin prevents endothelial dysfunction, superoxide production, and overexpression of p47phox induced by angiotensin II. Isorhamnetin appears to be a potent drug against esophageal cancer due to its in vitro potential to not only inhibit proliferation but also induce apoptosis of Eca-109 cells. (PMID: 15493462, 17368593, 17374653, 16963021).
Adenosylcobalamin is one of two metabolically active forms synthesized upon ingestion of vitamin B12 and is the predominant form in the liver; it acts as a coenzyme in the reaction catalyzed by methylmalonyl-CoA mutase. A cobalamin (cbl) derivative in which the substituent is deoxyadenosyl. It is one of two metabolically active forms synthesized upon ingestion of vitamin B12 and is the predominant form in the liver; it acts as a coenzyme in the reaction catalyzed by methylmalonyl-CoA mutase (MCM; E.C. 5.4.99.2). Inborn errors of vitamin B12 metabolism are autosomal recessive disorders and have been classified into nine distinct complementation classes. Disorders affecting adenosylcobalamin cause methylmalonic acidemia and metabolic acidosis. Methylmalonyl-CoA mutase catalyzes the conversion of L-methylmalonyl-CoA to succinyl-CoA and uses adenosylcobalamin (AdoCbl) as a cofactor. Cbl must be transported into mitochondria, reduced and adenosylated before it can be utilized by MCM. (PMID: 17011224).
pregn-5-ene-3,20-dione is classified as a gluco/mineralocorticoids, progestogin or a Gluco/mineralocorticoids, progestogin derivative. Gluco/mineralocorticoids, progestogins are steroids with a structure based on a hydroxylated prostane moiety. pregn-5-ene-3,20-dione is considered to be practically insoluble (in water) and relatively neutral
Estrone-glucuronide is the dominant metabolite of estradiol. Estrone glucuronide is formed by a UDP glucuronyltransferase (EC 2.4.1.17, UTP) reaction creating a much more water-soluble form of the hormone; glucuronides are the most abundant estrogen conjugates. Measurement of estrone-glucuronide is used as one reference method for determining ovulation (immunotubes are available for measuring urinary estrone glucuronide in conjunction with LH, one of the most advanced of ovulation prediction products). (PMID: 14742773, 1755456).
(±)-1,2-Propanedithiol is a flavouring ingredien
19-noraldosterone belongs to the family of Gluco/mineralocorticoids, Progestogins and Derivatives. These are steroids whose structure is based on an hydroxylated prostane moiety.
18-Hydroxycortisol is a derivative of cortIsolated It may be synthesized by zona fasciculata 11-beta hydroxylase in normal human adrenal cortex. (PMID 15356073; 1751390) Overproduction of 18-hydroxycortisol is an aid in the detection of Glucocorticoid-remediable aldosteronism which is an inherited form of mineralocorticoid excess associated with moderate overproduction of aldosterone, in which biochemical and clinical remission is dramatically induced by small amounts of glucocorticoids.(PMID: 1879399).
Acetoacetyl-CoA belongs to the class of organic compounds known as aminopiperidines. Aminopiperidines are compounds containing a piperidine that carries an amino group. Acetoacetyl-CoA is a strong basic compound (based on its pKa). In humans, acetoacetyl-CoA is involved in the metabolic disorder called the short-chain 3-hydroxyacyl-CoA dehydrogenase deficiency (HADH) pathway. Acetoacetyl-CoA is an intermediate in the metabolism of butanoate. It is a substrate for succinyl-CoA:3-ketoacid-coenzyme A transferase, hydroxymethylglutaryl-CoA synthase, short-chain 3-hydroxyacyl-CoA dehydrogenase, peroxisomal bifunctional enzyme, acetyl-CoA acetyltransferase, and 3-ketoacyl-CoA thiolase.
Thyroxine Sulfate (abbreviated T4) is a major Thyroid hormone metabolite secreted by follicular cells of the Thyroid gland. T4 is transported in blood, with 99.95% of the secreted T4 being protein bound, principally to thyroxine binding globulin (TBG) and to a lesser extent to thyroxine binding pre-albumin (TBPA) and serum albumin. T4 is involved in controlling the rate of metabolic processes in the body and influencing physical development. T4 is considered a prohormone and a reservoir for the active thyroid hormone triiodothyronine (T3), T4 being converted as required in the tissues by deiodinases.
3-methoxytyramine, also known as 4-(2-amino-Ethyl)-2-methoxy-phenol or 3-O-Methyldopamine, is classified as a member of the Methoxyphenols. Methoxyphenols are compounds containing a methoxy group attached to the benzene ring of a phenol moiety. 3-methoxytyramine is considered to be slightly soluble (in water) and acidic.  3-methoxytyramine can be found primarily in human brain and most tissues tissues; and in blood, cerebrospinal fluid (csf) or urine. Within a cell, 3-methoxytyramine is primarily located in the cytoplasm
Bisnorbiotin is a natural biotin metabolite in human urine. (PMID 9039841). The urinary excretion of Bisnorbiotin a increased with biotin administration. (PMID 9022537).
Irbesartan is an angiotensin receptor blocker (ARB) used mainly for the treatment of hypertension. It competes with angiotensin II for binding at the AT1 receptor subtype. Unlike ACE inhibitors, ARBs do not have the adverse effect of dry cough. The use of ARBs is pending revision due to findings from several clinical trials suggesting that this class of drugs may be associated with a small increased risk of cancer.
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).
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.
Leanness enhancer for pigs. Approved for use in the USA
Sulfapyridine is only found in individuals that have used or taken this drug. It is an antibacterial, potentially toxic, used to treat certain skin diseases. [PubChem] Sulfapyridine is a competitive inhibitor of the bacterial enzyme dihydropteroate synthetase. The inhibited reaction is necessary in these organisms for the synthesis of folic acid by means of processing the substrate para-aminobenzoic acid (PABA). Dihydropteroate synthetase activity is vital in the synthesis of folate, and folate is required for cells to make nucleic acids, such as DNA or RNA. So if DNA molecules cannot be built, the cell cannot divide.
Oxprenolol is only found in individuals that have used or taken this drug. It is a non-selective beta blocker with some intrinsic sympathomimetic activity. It is used for the treatment of angina pectoris, abnormal heart rhythms, anxiety, and high blood pressure. Oxprenolol is a lipophilic beta blocker which passes the blood-brain barrier more easily than water-soluble beta blockers. As such, it is associated with a higher incidence of CNS-related side effects than beta blockers with more hydrophilic molecules such as atenolol, sotalol, and nadolol (Wikipedia). Like other beta-adrenergic antagonists, oxprenolol competes with adrenergic neurotransmitters such as catecholamines for binding at sympathetic receptor sites. Like propranolol and timolol, oxprenolol binds at beta(1)-adrenergic receptors in the heart and vascular smooth muscle, inhibiting the effects of the catecholamines epinephrine and norepinephrine and decreasing heart rate, cardiac output, and systolic and diastolic blood pressure. It also blocks beta-2 adrenergic receptors located in bronchiole smooth muscle, causing vasoconstriction. By binding beta-2 receptors in the juxtaglomerular apparatus, oxprenolol inhibits the production of renin, thereby inhibiting angiotensin II and aldosterone production. Oxprenolol, therefore, inhibits the vasoconstriction and water retention due to angiotensin II and aldosterone, respectively.
Alanyltyrosine is a dipeptide composed of alanine 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.
Cefmetazole is only found in individuals that have used or taken this drug. It is a semisynthetic cephamycin antibiotic with a broad spectrum of activity against both gram-positive and gram-negative microorganisms. It has a high rate of efficacy in many types of infection and to date no severe side effects have been noted. [PubChem]The bactericidal activity of cefmetazole results from the inhibition of cell wall synthesis via affinity for penicillin-binding proteins (PBPs).
Harmine is found in fruits. Harmine is an alkaloid from Passiflora edulis (passionfruit
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.
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.
Desvenlafaxine, the major active metabolite of venlafaxine, is an antidepressant from the serotonin-norepinephrine reuptake inhibitor (SNRI class). Desvenlafaxine may be used to treat major depressive disorder and is being studied for use in the management of vasomotor symptoms in postmenopausal women.
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.
4-Methoxycinnamic acid, also known as para-methoxycinnamate or O-methyl-p-coumarate, belongs to the class of organic compounds known as cinnamic acids. These are organic aromatic compounds containing a benzene and a carboxylic acid group forming 3-phenylprop-2-enoic acid. Outside of the human body, 4-Methoxycinnamic acid is found, on average, in the highest concentration within turmerics. 4-Methoxycinnamic acid has also been detected, but not quantified in cow milk and wild celeries. This could make 4-methoxycinnamic acid a potential biomarker for the consumption of these foods.
Perindoprilat is a metabolite of perindopril. Perindopril, or perindopril arginine, (trade names include Coversyl and Aceon) is a long-acting ACE inhibitor. Perindopril is used to treat high blood pressure, heart failure or stable coronary artery disease. It is also available in a generic form, perindopril erbumine. (Wikipedia)
Amphotericin B shows a high order of in vitro activity against many species of fungi. Histoplasma capsulatum, Coccidioides immitis, Candida species, Blastomyces dermatitidis, Rhodotorula, Cryptococcus neoformans, Sporothrix schenckii, Mucor mucedo, and Aspergillus fumigatus are all inhibited by concentrations of amphotericin B ranging from 0.03 to 1.0 mcg/mL in vitro. While Candida albicans is generally quite susceptible to amphotericin B, non-albicans species may be less susceptible. Pseudallescheria boydii and Fusarium sp. are often resistant to amphotericin B. The antibiotic is without effect on bacteria, rickettsiae, and viruses.
Fosphenytoin is a water-soluble phenytoin prodrug used only in hospitals for the treatment of epileptic seizures. It works by slowing down impulses in the brain that cause seizures. Its main mechanism is to block frequency-dependent, use-dependent and voltage-dependent neuronal sodium channels, and therefore limit repetitive firing of action potentials.
Bevantolol is a beta-1 adrenoceptor antagonist that has been shown to be as effective as other beta blockers for the treatment of angina pectoris and hypertension. Mechanism of Action Animal experiments confirm both agonist and antagonist effects on alpha-receptors, in addition to antagonist activity at beta-1 receptors.
Licoricesaponin H2 is found in herbs and spices. Licoricesaponin H2 is a constituent of Glycyrrhiza uralensis (Chinese licorice).
Previtamin D3 is an intermediate in the production of Vitamin D.
Monoglyceride citrate is used as a food additive [EAFUS] ("EAFUS: Everything Added to Food in the United States. [http://www.eafus.com/]")
5-Isopropyl-2-methylphenol, also known as 2-hydroxy-p-cymene or 2-p-cymenol, belongs to the class of organic compounds known as aromatic monoterpenoids. These are monoterpenoids containing at least one aromatic ring. 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 the plastids. 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. 5-Isopropyl-2-methylphenol is a very hydrophobic molecule, practically insoluble in water, but fairly soluble in organic solvents. Thus, 5-Isopropyl-2-methylphenol is considered to be an isoprenoid lipid molecule. Thymol is found in the essential oil of thyme and in the essential oils of several different plants. It can be extracted from Thymus vulgaris (common thyme), Ajwain and various other kinds of plants as a white crystalline substance of a pleasant aromatic odor and strong antiseptic properties. Thymol also provides the distinctive, strong flavor of the culinary herb thyme, also produced from T. vulgaris. Thymol has also been identified as a volatile compound found in cannabis samples obtained from police seizures (PMID:26657499 ).
Prenol is found in blackcurrant. Prenol is a constituent of ylang-ylang and hop oils. Prenol is found in orange peel oil and various fruits e.g. orange, lemon, lime, grape, pineapple, purple passion fruit, loganberry etc. Prenol is a flavouring ingredient
Gamma-linolenoyl-CoA is the product of a chemical reaction that involves linoleoyl-CoA desaturase which acts as a catalyst. In enzymology, linoleoyl-CoA desaturase (EC 1.14.19.3) is an enzyme that catalyzes the chemical reaction. linoleoyl-CoA + AH2 + O2 gamma-linolenoyl-CoA + A + 2 H2O. The 3 substrates of this enzyme are linoleoyl-CoA, AH2, and O2, whereas its 3 products are gamma-linolenoyl-CoA, A, and H2O. (Wikipedia).
Palmitoleyl-CoA is a monounsaturated fatty acid, the product of palmitoyl-CoA from a reaction catalyzed by stearoyl-CoA desaturase (EC 1.14.99.5, SCD) in the endoplasmic reticulum, an enzyme that catalyzes the delta9-cis desaturation of saturated fatty acyl-CoAs. These monounsaturated fatty acids are used as substrates for the synthesis of triglycerides, wax esters, cholesteryl esters, and membrane phospholipids. The saturated to monounsaturated fatty acid ratio affects membrane phospholipid composition and alteration in this ratio has been implicated in a variety of disease states including cardiovascular disease, obesity, diabetes, neurological disease, skin disorders, and cancer. Thus, the expression of SCD is of physiological importance in normal and disease states. Unsaturated fatty acids are the most abundant form of stored fat in the human body and are vital for all living organisms. In addition to their role as an energy source, they are integral constituents of cell membranes, playing a role in membrane fluidity, cell signalling, and membrane integrity. Numerous beneficial physiologic effects have been attributed to unsaturated fatty acids, including protection from obesity, diabetes, cancer, and atherosclerosis (PMID: 12538075, 16020546).
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).
Ebrotidine is an H2 receptor antagonist with gastroprotective activity against ethanol-, aspirin- or stress-induced gastric mucosal damage. The antisecretory properties of ebrotidine are similar to those of ranitidine, and approximately 10-fold greater than those of cimetidine. Ebrotidine has anti-Helicobacter pylori activity via inhibition of the urease enzyme and the proteolytic and mucolytic activities of the bacterium. However, its activity is synergistic with a number of antibacterial agents. Ebrotidine counteracts the inhibitory effects of H. pylori lipo-polysaccharides.
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].
Ethyl icosapentate is found in fishes. Ethyl icosapentate is isolated from fish oils.
alpha-Amyrin palmitate is found in black elderberry. alpha-Amyrin palmitate is isolated from Santalum album (sandalwood). alpha-Amyrin palmitate is a flavouring ingredien
Bleaching agent which may occur adventitiously in food, occurrence not well documented
Sofalcone belongs to the family of Chalcones and Dihydrochalcones. These are organic compounds containing 1,3-Diphenylpropenone (benzylideneacetophenone), ArCH=CH(=O)Ar,or its derivatives formed by substitution.
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.
Arachidonyl-CoA is an intermediate in Biosynthesis of unsaturated fatty acids. Arachidonyl-CoA is produced from 8,11,14-Eicosatrienoyl-CoA via the enzyme fatty acid desaturase 1 (EC 1.14.19.-). It is then converted to Arachidonic acid via the enzymepalmitoyl-CoA hydrolase (EC 3.1.2.2).
Lc3Cer, also known as NLC(4)Cer or Paragloboside, is classified as a member of the Glycosyl-N-acylsphingosines. Glycosyl-N-acylsphingosines are compounds containing a sphingosine linked to a simple glucosyl moiety. Lc3Cer is considered to be practically insoluble (in water) and acidic
(20R)-Ginsenoside Rh2 is found in tea. (20R)-Ginsenoside Rh2 is isolated from Panax ginseng (ginseng).
Metyrapol is a metabolite of metyrapone. Metyrapone (trade name Metopirone) is a drug used in the diagnosis of adrenal insufficiency and occasionally in the treatment of Cushing's syndrome (hypercortisolism). (Wikipedia)
Smilagenone is found in root vegetables. Smilagenone is a constituent of the wild yam Dioscorea deltoidea.
5-Hydroxyflavone is found in pulses. 5-Hydroxyflavone is a constituent of Medicago sativa.
Gadobenic acid, also known as gadobenate, belongs to the class of organic compounds known as pentacarboxylic acids and derivatives. These are carboxylic acids containing exactly five carboxyl groups. Gadobenic acid is considered to be a practically insoluble (in water) and relatively neutral molecule.
A quaternary ammonium anticholinergic agent with peripheral side effects similar to those of atropine. It is used as an adjunct in the treatment of gastric and duodenal ulcer, and to relieve visceral spasms. The drug has also been used in the form of eye drops for mydriatic effect. [PubChem]
Promazine is only found in individuals that have used or taken this drug. It is a phenothiazine with actions similar to chlorpromazine but with less antipsychotic activity. It is primarily used in short-term treatment of disturbed behavior and as an antiemetic. [PubChem]Promazine is an antagonist at types 1, 2, and 4 dopamine receptors, 5-HT receptor types 2A and 2C, muscarinic receptors 1 through 5, alpha(1)-receptors, and histamine H1-receptors. Promazine's antipsychotic effect is due to antagonism at dopamine and serotonin type 2 receptors, with greater activity at serotonin 5-HT2 receptors than at dopamine type-2 receptors. This may explain the lack of extrapyramidal effects. Promazine does not appear to block dopamine within the tubero-infundibular tract, explaining the lower incidence of hyperprolactinemia than with typical antipsychotic agents or risperidone. Antagonism at muscarinic receptors, H1-receptors, and alpha(1)-receptors also occurs with promazine.
Promazine 5-sulfoxide is only found in individuals that have used or taken Promazine. Promazine 5-sulfoxide is a metabolite of Promazine. Promazine 5-sulfoxide 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.
Asymmetric dimethylarginine (ADMA) is a naturally occurring chemical found in blood plasma. It is a metabolic by-product of continual protein modification processes in the cytoplasm of all human cells. It is closely related to L-arginine, a conditionally-essential amino acid. ADMA interferes with L-arginine in the production of nitric oxide, a key chemical to endothelial and hence cardiovascular health. Asymmetric dimethylarginine is created in protein methylation, a common mechanism of post-translational protein modification. This reaction is catalyzed by an enzyme set called S-adenosylmethionine protein N-methyltransferases (protein methylases I and II). The methyl groups transferred to create ADMA are derived from the methyl group donor S-adenosylmethionine, an intermediate in the metabolism of homocysteine. (Homocysteine is an important blood chemical, because it is also a marker of cardiovascular disease). After synthesis, ADMA migrates into the extracellular space and thence into blood plasma. Asymmetric dimethylarginine is measured using high performance liquid chromatography. ADMA has been identified as a uremic toxin according to the European Uremic Toxin Working Group (PMID: 22626821).
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.
Troleandomycin is only found in individuals that have used or taken this drug. It is a macrolide antibiotic that is similar to erythromycin.Troleandomycin acts by penetrating the bacterial cell membrane and reversibly binding to the 50 S subunit of bacterial ribosomes or near the "P" or donor site so that binding of tRNA (transfer RNA) to the donor site is blocked. Translocation of peptides from the "A" or acceptor site to the "P" or donor site is prevented, and subsequent protein synthesis is inhibited.
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
Manganese is an essential trace nutrient in all forms of life. Physiologically, it. exists as an ion in the body. It is concentrated in cell mitochondria, mostly in the pituitary gland, liver, pancreas, kidney, and bone, influences the synthesis of mucopolysaccharides, stimulates hepatic synthesis of cholesterol and fatty acids, and is a cofactor in many enzymes, including arginase and alkaline phosphatase in the liver.
Protriptyline hydrochloride is a dibenzocycloheptene-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, protriptyline does not affect mood or arousal, but may cause sedation. In depressed individuals, protriptyline 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. Protriptyline may be used for the treatment of depression.
(S)-Edulinine is found in pomes. (S)-Edulinine is an alkaloid from the bark of Casimiroa edulis (Mexican apple
2-Ketobutyric acid, also known as alpha-ketobutyrate or 2-oxobutyrate, 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. 2-Ketobutyric acid is a substance that is involved in the metabolism of many amino acids (glycine, methionine, valine, leucine, serine, threonine, isoleucine) as well as propanoate metabolism and C-5 branched dibasic acid metabolism. It is also one of the degradation products of threonine. It can be converted into propionyl-CoA (and subsequently methylmalonyl CoA, which can be converted into succinyl CoA, a citric acid cycle intermediate), and thus enter the citric acid cycle. More specifically, 2-ketobutyric acid is a product of the lysis of cystathionine.
Cysteinyl-Phenylalanine is a dipeptide composed of cysteine 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.
Oxidized-adrenal-ferredoxin, also known as Epinephrine racemic or Racepinefrine, is classified as a member of the Catechols. Catechols are compounds containing a 1,2-benzenediol moiety. Oxidized-adrenal-ferredoxin is considered to be soluble (in water) and acidic
N-Glycolylneuraminic acid (Neu5Gc) is a widely expressed sialic acid found in most mammalian cells. Although humans are genetically deficient in producing Neu5Gc, small amounts are present in human cells and biofluids. Humans cannot synthesize Neu5Gc because the human gene CMAH is irreversibly mutated, though it is found in apes. This loss of the CMAH gene was estimated to have occurred two to three million years ago, just before the emergence of the genus Homo. A dietary origin of Neu5Gc was suggested by human volunteer studies. These trace amounts of Neu5Gc were determined to come from the consumption of animals in the human diet (i.e. red meats such as lamb, pork, and beef). Neu5Gc can also be found in dairy products, but to a lesser extent. Neu5Gc is not found in poultry and is found in only trace amounts in fish (Wikipedia).
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.
3,4-Dimethoxyphenylethylamine, also known as 3,4-DMPEA or DMPEA is an endogenous metabolite found in urine that belongs to both the phenethylamine and catecholamine families. DMPEA is an analogue of dopamine (3,4-dihydroxyphenethylamine), with a substitution of the hydroxy groups with methoxy groups. DMPEA is also structurally similar to mescaline (3,4,5-trimethoxyphenylethylamine) and occurs naturally alongside it in various species of cacti such as the San Pedro and Peruvian Torch (PMID: 5511715, 925910, 600028). DMPEA received wide attention after it was proposed as a biomarker in schizophrenic patients urine, however later studies revealed that DMPEA is also excreted by non-schizophrenics (PMID: 709888). DMPEA has little known bioactivity, but it has some action as a monoamine oxidase inhibitor (PMID: 886445). DMPEA has also been shown to have neurotoxic effects, especially in the nigrostriatal system and among dopaminergic neurons (PMID: 9409711, 9134983). DMPEA appears to be an inhibitor of mitochondrial complex I (PMID: 9409711).
Dicloxacillin is only found in individuals that have used or taken this drug. It is one of the penicillins which is resistant to penicillinase. [PubChem]Dicloxacillin exerts a bactericidal action against penicillin-susceptible microorganisms during the state of active multiplication. All penicillins inhibit the biosynthesis of the bacterial cell wall. By binding to specific penicillin-binding proteins (PBPs) located inside the bacterial cell wall, dicloxacillin 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 dicloxacillin interferes with an autolysin inhibitor.
Histidinal (CAS: 23784-33-0), also known as histidinaldehyde, belongs to the class of organic compounds known as aralkylamines. These are alkylamines in which the alkyl group is substituted at one carbon atom by an aromatic hydrocarbyl group. Histidinal is a very strong basic compound (based on its pKa). Histidinal is involved in the histidine biosynthesis pathway. Histidinal is produced by the reaction between histidinol and NAD+, with NADH as a byproduct. The reaction is catalyzed by histidinol dehydrogenase. Histidinal reacts with NAD+ and H2O to produce L-histidine and NADH. Histidinol dehydrogenase catalyzes this reaction.
1-Octacosanol (also known as n-octacosanol, octacosyl alcohol, cluytyl alcohol, montanyl alcohol) is a straight-chain aliphatic 28-carbon primary fatty alcohol that is common in the epicuticular waxes of plants, including the leaves of many species of Eucalyptus, of most forage and cereal grasses, of Acacia, Trifolium, Pisum and many other legume genera among many others, sometimes as the major wax constituent. Octacosanol also occurs in wheat germ. Octacosanol is insoluble in water but freely soluble in low molecular-weight alkanes and in chloroform (CHCl3). 1-Octacosanol is found in apple.
It is used as a food additive
3,17-Androstanediol glucuronide is a natural human metabolite of 3,17-Androstanediol 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.
Phenmetrazine is only found in individuals that have used or taken this drug. It is a sympathomimetic drug used primarily as an appetite depressant. Its actions and mechanisms are similar to dextroamphetamine. [PubChem]Phenmetrazine is thought to block the reuptake of norepinephrine and dopamine into the presynaptic neuron leading to an increase in the release of these monoamines into the extraneuronal space. Dopamine integrates incoming sensory stimuli, initiates and controls fine movement (nigro-neostriatal pathway), controls emotional behavior (midbrain mesolimbic-forebrain system) and controls hypothalamic-pituitary endocrine system (tubero-infundibular system). It is this latter effect on the tubero-infundibular systm that seems to lead to reduced food intake. Phenmetrazine also acts as a monoamine oxidase inhibitor.
Tamoxifen N-oxide 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)
Grepafloxacin hydrochloride (Raxar&reg;, Glaxo Wellcome) is an oral broad-spectrum quinoline antibacterial agent used to treat bacterial infections. Grepafloxacin was withdrawn in the United States due to its side effect of lengthening the QT interval on the electrocardiogram, leading to cardiac events and sudden death. [Wikipedia]
Tetrahymanol is involved in the terpenoid biosynthesis pathway. Tetrahymanol is produced from squalene.
Tolmetin 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.
Allopurinol is an analog of the natural purines in the body, and is quickly metabolized to oxypurines which is also a xanthine oxidase inhibitor. Allopurinol is a white, powdery drug used to treat gout. Its use in the United States was started in 1964. It is an isomer of hypoxanthine and inhibits the production of uric acid, the metabolite responsible for gout, by inhibiting the enzyme xanthine oxidase. The side effects of high levels of precursors are usually minor. A small percentage of people develop a rash and must discontinue this drug. The most serious adverse event is a hypersensitivity syndrome consisting of fever, skin rash, eosinophilia, hepatitis, and worsening renal function. In some cases, allopurinol hypersensitivity syndrome.
5-Methyldeoxycytidine is a dinucleotide. Methylation of cytosine-guanine dinucleotide sequences (CpG dinucleotides) catalyzed by DNA methyltransferase, particularly in the 5&#8242;-promoter regions of mammalian genes, forms 5-methyldeoxycytidine (5-mdc) whose levels may regulate gene expression. Levels of 5-mdc and the expression of nm23-H1 (an anti-metastatic gene identified in and human cancer lines) are highly correlated with human hepatoma cells with different invasion activities. DNA hypermethylation is a common finding in malignant cells and has been explored as a therapeutic target for hypomethylating agents. The levels of 5-mdc in the urine of patients with breast cancer is not significantly different than controls. (PMID: 17044778, 17264127, 16799933).
Kyotorphin (L-tyrosyl-L-arginine) is a neuroactive dipeptide which plays a role in pain regulation in the brain. It was first isolated from bovine brain by Japanese scientists in 1979. Kyotorphin was named for the site of its discovery, Kyoto, Japan and because of its morphine- (or endorphin-) like analgesic activity. Kyotorphin has an analgesic effect, but it does not interact with the opioid receptors. Instead, it acts by releasing an Met-enkephalin and stabilizing it from degradation. It may also possess properties of neuromediator/neuromodulator. It has been shown that kyotorphin is present in the human cerebrospinal fluid and that it is lower in patients with persistent pain.
Irinotecan is an antineoplastic enzyme inhibitor primarily used in the treatment of colorectal cancer. It is a derivative of camptothecin that inhibits the action of topoisomerase I. Irinotecan prevents religation of the DNA strand by binding to topoisomerase I-DNA complex, and causes double-strand DNA breakage and cell death.
2-Indolecarboxylic acid is a strong inhibitor of lipid peroxidation, similar to melatonin and some structurally related indole compounds. Lipid peroxidation with tert-butyl hydroperoxide is a source of free radicals (PMID 12236544). 2-Indolecarboxylic acid is a phenolic components known to exist in Korean ginseng (Koryo Insam Hakhoechi (1996), 20(3), 284-290) and brown rice (Han'guk Nonghwa Hakhoechi (1995), 38(5), 478-83).
The major progestational steroid that is secreted primarily by the corpus luteum and the placenta. Progesterone acts on the uterus, the mammary glands and the brain. It is required in embryo implantation, pregnancy maintenance, and the development of mammary tissue for milk production. Progesterone, converted from pregnenolone, also serves as an intermediate in the biosynthesis of gonadal steroid hormones and adrenal corticosteroids. 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. 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 labor. In addition progesterone inhibits lactation during pregnancy. The fall in progesterone levels following delivery is one of the triggers for milk production. Progesterone is found to be associated with pregnene hydroxylation deficiency, which is an inborn error of metabolism.
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.
Isobutyric acid is a carboxylic or short chain fatty acid with characteristic sweat-like smell. Small amount of isobutyrate is generated via microbial (gut) metabolism. Small amounts may also be found in certain foods or fermented beverages. There is anosmia (genetic inability to smell) for the odor of isobutyric acid with a frequency of about 2.5%. (OMIM 207000). Isobutyric acid is slightly soluble in water but much more soluble in ethanol, ether and organic solvents. Isobutyric acid can affect people if breathed in and may be absorbed through the skin. Contact can irritate and burn the skin and eyes. Breathing Isobutyric acid can irritate the nose, throat and lungs causing coughing, wheezing and/or shortness of breath.
2-Oxovaleric acid is an alpha-ketoacid is a metabolite usually found in human biofluids. Ketoacids have been known to play an important part in the metabolism of valine, leucine, isoleucine. 2-Oxovaleric acid presence has been determined in human blood serum and urine in numerous scientific documents, although its origin remains unclear. (PMID: 11482739, 9869358, 3235498).
1-Methylnicotinamide is a metabolite of nicotinamide and is produced primarily in the liver. It has anti-inflammatory properties (PMID 16197374). It is a product of nicotinamide N-methyltransferase [EC 2.1.1.1] in the pathway of nicotinate and nicotinamide metabolism (KEGG). 1-Methylnicotinamide may be an endogenous activator of prostacyclin production and thus may regulate thrombotic as well as inflammatory processes in the cardiovascular system (PMID: 17641676).
4-Aminohippuric 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. Renal proximal tubules secrete various organic anions, including drugs and p-aminohippurate (PAH). Uptake of PAH from blood into tubule cells occurs by exchange with intracellular alpha-ketoglutarate and is mediated by the organic anion transporter 1. PAH exit into tubule lumen is species specific and may involve ATP-independent and -dependent transporters. (PMID 11443229). Enhanced secretion of p-aminohippuric acid occurs in Fanconi's syndrome (FS). FS is associated with numerous varieties of inherited and acquired conditions; FS is characterized by a generalized transport defect in the proximal tubules, leading to renal losses of glucose, phosphate, calcium, uric acid, amino acids, bicarbonates, and other organic compounds. (PMID 12552490).
3-methyl-9H-xanthine is a 3-methylxanthine tautomer where the imidazole proton is located at the 9-position. It has a role as a metabolite. It is a tautomer of a 3-methyl-7H-xanthine. 3-Methylxanthine, also known as 3 MX or purine analog, belongs to the class of organic compounds known as xanthines. These are purine derivatives with a ketone group conjugated at carbons 2 and 6 of the purine moiety.
Glucosamine 6-sulfate is a naturally occurring compound present in many of the body's tissues, and belongs to a class of compounds known as glycosaminoglycans (GAGs). Glucosamine 6-sulfate is being used in the treatment of arthritis. Glucosamine for arthritis products is usually formulated as the hydrochloride salt or glucosamine sulfate and often combined with chondroitin sulphate. It is notable that while both the hydrochloride salt and glucosamine sulfate are used in pharmaceutical preparations, glucosamine sulfate is thought to have a higher biological activity due to the presence of the sulfate. It should also be noted that there is a large cost difference between the two salts, with the hydrochloride salt being significantly less expensive. (PMID: 15925239).
N-Acetylmannosamine, also known as beta-ManNAcc or β-ManNAc, 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. Within humans, N-acetylmannosamine participates in a number of enzymatic reactions. In particular, N-acetylmannosamine can be biosynthesized from N-acetyl-D-glucosamine, which is catalyzed by the enzyme N-acylglucosamine 2-epimerase. In addition, N-acetylmannosamine and uridine 5'-diphosphate can be biosynthesized from uridine diphosphate-N-acetylglucosamine; which is mediated by the enzyme bifunctional UDP-N-acetyl glucosamine 2-epimerase / N-acetylmannosamine kinase. In humans, N-acetylmannosamine is involved in the metabolic disorder called the salla disease/infantile sialic acid storage disease pathway. In the rate-limiting step of the pathway, UDP-GlcNAc is converted into ManNAc by UDP-GlcNAc 2-epimerase, encoded by the epimerase domain of GNE. Improved sialylation after the addition of ManNAc and other supporting ingredients to the culture medium not only increases manufacturing yield, but also improves therapeutic efficacy by increasing solubility, increasing half-life and reducing immunogenicity by reducing the formation of antibodies to the therapeutic glycoprotein When the GNE epimerase kinase does not function correctly in the human body thereby reducing the available ManNAc, it is reasonable to assume that treatment with ManNAc could assist with improving health benefits. There is no available therapy to treat GNE myopathy. ManNAc is the first committed biological precursor of N-acetylneuraminic acid (Neu5Ac, sialic acid).
Ritalinic acid belongs to the family of Beta Amino Acids and Derivatives. These are amino acids having a (-NH2) group attached to the beta carbon atom.
Iminodiacetic acid (IDA) is a dicarboxylic acid amine. It is a strongly acidic compound that is very water soluble. It naturally exists as a white powder. IDA is food by-product or intermediate produced via the reaction of glycine with acrylamide through the heating, baking or frying of carbohydrate-rich foods such as potatoes (PMID: 25212154).  Acrylamide is typically produced through a Maillard reaction (a heating reaction) of asparagine and various reducing sugars in plant-derived foods (PMID: 12368844). Concentrations of IDA are reduced in the plasma of individuals with autism (PMID: 33087514) and elevated in individuals with acute respiratory distress syndrome (ARDS) (PMID: 30779905). In addition to its role in metabolism, IDA has many industrial applications or roles. For instance, it is an important intermediate in the manufacture the herbicide glyphosate. IDA is also used in capillary electrophoresis for modulating peptide mobility and can be used as a precursor for the manufacture of the indicator xylenol orange. The iminodiacetate anion can act as a tridentate ligand to form a metal complex with two, fused, five membered chelate rings. The proton on the nitrogen atom can be replaced by a carbon atom of a polymer to create an ion-exchange resin, such as chelex 100. Iminodiacetic acid is used in HIDA (hepatobiliary iminodiacetic acid) scans or cholescintigraphy scans, that employ the radionuclide Technetium 99m, to diagnose several diseases in the liver, gallbladder and bile duct.
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).
Galactonic acid is a sugar acid that is a metabolic breakdown product of galactose. Galactose dehydrogenase is responsible for converting galactose to galactonolactone, which then spontaneously or enzymatically converts to galactonic acid. Once formed, galactonic acid may enter the pentose phosphate pathway. Galactonic acid is increased in red blood cells of galactosemic patients, due to a galactose-1-phosphate uridyltransferase (GALT) deficiency (PMID: 14680973, OMMBID: The Online Metabolic and Molecular Bases of Inherited Disease, Ch.72). When present in sufficiently high levels, galactonic 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 galactonic acid are associated with at least two inborn errors of metabolism, including galactosemia and galactosemia type II. Galactonic 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, liver abnormalities (jaundice), kidney abnormalities, seizures, coma, and possibly death. These are also the characteristic symptoms of untreated galactosemia. Many affected children with organic acidemias experience intellectual disability or delayed development. High levels of galactonic acid in infants are specifically associated with hepatomegaly (an enlarged liver), cirrhosis, renal failure, cataracts, vomiting, seizure, hypoglycemia, lethargy, brain damage, and ovarian failure.
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.
D-myo-Inositol 3-phosphate, also known as inositol 3-phosphoric acid, 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 3-phosphate is an extremely weak basic (essentially neutral) compound (based on its pKa). D-myo-Inositol 3-phosphate is involved in the inositol phosphate metabolism and the phosphatidylinositol signalling systems. D-myo-Inositol 3-phosphate is created from D-myo-inositol 3,4-bisphosphate by inositol polyphosphate-4-phosphatase (EC 3.1.3.66) and is converted into myo-inositol by myo-inositol-1(or 4)-monophosphatase (EC 3.1.3.25).
m-Coumaric acid, also known as 3-coumarate, belongs to the class of organic compounds known as hydroxycinnamic acids. Hydroxycinnamic acids are compounds containing an cinnamic acid where the benzene ring is hydroxylated. m-Coumaric acid exists in all living organisms, ranging from bacteria to humans. m-Coumaric acid (CAS: 588-30-7) is a polyphenol metabolite from caffeic acid, formed by the gut microflora. Outside of the human body, m-Coumaric acid is found, on average, in the highest concentration within a few different foods, such as olives, corns, and beers. m-Coumaric acid has also been detected, but not quantified in several different foods, such as carrots, strawberries, grape wines, garden tomato, and bilberries. MCT-mediated absorption of phenolic compounds per se and their colonic metabolites would exert a significant impact on human health (PMID:16870009, 15479001, 15479001). m-Coumaric acid is transported by the monocarboxylic acid transporter (MCT). The amount of this compound in human biofluids is diet-dependant. m-Coumaric acid is detected after the consumption of whole grain.
4-Hydroxybenzaldehyde, also known as 4-formylphenol or 4-hydroxybenzenecarbonal, belongs to the class of organic compounds known as hydroxybenzaldehydes. These are organic aromatic compounds containing a benzene ring carrying an aldehyde group and a hydroxyl group. A hydroxybenzaldehyde that is benzaldehyde substituted with a hydroxy group at position C-4. 4-Hydroxybenzaldehyde exists in all living organisms, ranging from bacteria to humans. 4-Hydroxybenzaldehyde is a sweet, almond, and balsam tasting compound. 4-Hydroxybenzaldehyde is found, on average, in the highest concentration within vinegars and oats. 4-Hydroxybenzaldehyde has also been detected, but not quantified, in several different foods, such as cardoons, colorado pinyons, oyster mushrooms, common chokecherries, and potato. This could make 4-hydroxybenzaldehyde a potential biomarker for the consumption of these foods.
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.).
The ATP-dependent carboxylate-amine/thiol ligase superfamily is known to contain enzymes catalyzing the formation of various types of peptide, one of which is d-alanyl-d-alanine.(PMID: 16030213). The glycopeptide antibiotic vancomycin acts by binding to the D-alanyl-D-alanine terminus of the cell wall precursor lipid II in the cytoplasmic membrane.(PMID: 17418637). D-alanine-D-alanine ligase from Thermotoga maritima ATCC 43589 (TmDdl) was a useful biocatalyst for synthesizing D-amino acid dipeptides.D-Alanine-D-alanine ligase (Ddl) catalyzes the biosynthesis of an essential bacterial peptidoglycan precursor D-alanyl-D-alanine and it represents an important target for development of new antibacterial drugs. (PMID: 17267218). D-Alanyl-D-alanine is a microbial metabolite.
Glycylproline is a dipeptide composed of glycine and proline, and is an end product of collagen metabolism that is further cleaved by prolidase (EC 3.4.13.9). The resulting proline molecules are recycled into collagen or other proteins. Prolidase deficiency is a rare autosomal recessive disease characterized by chronic ulcerative dermatitis, mental retardation, frequent infections, and massive urinary excretion of iminodipeptides. Patients with this disease have reportedly decreased prolidase enzyme activity against glycylproline (Gly-Pro). The enzyme's activity against other substrates is not as affected. Some patients with prolidase deficiency have a marked urinary excretion of glycylproline. Patients with pressure sores contain significantly more urinary glycylproline than the control (PMID: 16009141, 7629169, 1536787, 10582130).
1-Methyladenine is the product of reaction between 1-methyladenosine and water which is catalyzed by 1-methyladenosine nucleosidase (EC:3.2.2.13). 1-Methyladenine is a product of alkylation damage in DNA which can be repaired by damage reversal by oxidative demethylation, a reaction requiring ferrous iron and 2-oxoglutarate as cofactor and co-substrate, respectively (PMID:15576352). 1-Methyladenine is found to be associated with adenosine deaminase (ADA) deficiency, which is an inborn error of metabolism.
Adenine is a purine base. Adenine is found in both DNA and RNA. Adenine is a fundamental component of adenine nucleotides. Adenine forms adenosine, a nucleoside, when attached to ribose, and deoxyadenosine when attached to deoxyribose; it forms adenosine triphosphate (ATP), a nucleotide, when three phosphate groups are added to adenosine. Adenosine triphosphate is used in cellular metabolism as one of the basic methods of transferring chemical energy between chemical reactions. Purine inborn errors of metabolism (IEM) are serious hereditary disorders, which should be suspected in any case of neonatal fitting, failure to thrive, recurrent infections, neurological deficit, renal disease, self-mutilation and other manifestations. Investigation usually starts with uric acid (UA) determination in urine and plasma. (OMIM 300322, 229600, 603027, 232400, 232600, 232800, 201450, 220150, 232200, 162000, 164050, 278300). (PMID: 17052198, 17520339).
Xanthosine, also known as xanthine riboside, 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. Xanthosine is a nucleoside derived from xanthine and ribose. Xanthosine exists in all living species, ranging from bacteria to plants to humans. In plants xanthosine is the biosynthetic precursor to 7-methylxanthosine which is produced by the action of the enzyme known as 7-methylxanthosine synthase. 7-Methylxanthosine in turn is the precursor to theobromine (the active alkaloid in chocolate), which in turn is the precursor to caffeine, the active alkaloid in coffee and tea. Within humans, xanthosine participates in a number of enzymatic reactions. In particular, xanthosine can be biosynthesized from xanthylic acid; which is catalyzed by the enzyme cytosolic purine 5'-nucleotidase. In addition, xanthosine can be converted into xanthine and ribose 1-phosphate; which is mediated by the enzyme purine nucleoside phosphorylase. Xanthosine monophosphate (XMP) is an intermediate in purine metabolism, formed from IMP (inosine monophosphate).
Deoxyuridine, also known as dU, belongs to the class of organic compounds known as pyrimidine 2'-deoxyribonucleosides. Pyrimidine 2'-deoxyribonucleosides are compounds consisting of a pyrimidine linked to a ribose which lacks a hydroxyl group at position 2. It is similar in chemical structure to uridine, but without the 2'-hydroxyl group. Deoxyuridine exists in all living organisms, ranging from bacteria to humans. Within humans, deoxyuridine participates in a number of enzymatic reactions. In particular, deoxyuridine can be biosynthesized from deoxycytidine through its interaction with the enzyme cytidine deaminase. In addition, deoxyuridine can be converted into uracil and deoxyribose 1-phosphate through its interaction with the enzyme thymidine phosphorylase. Deoxyuridine is considered to be an antimetabolite that is converted into deoxyuridine triphosphate during DNA synthesis. Laboratory suppression of deoxyuridine is used to diagnose megaloblastic anemia due to vitamin B12 and folate deficiencies. In humans, deoxyuridine is involved in the metabolic disorder called UMP synthase deficiency (orotic aciduria). Outside of the human body, deoxyuridine has been detected, but not quantified in, several different foods, such as lichee, highbush blueberries, agaves, macadamia nut (M. tetraphylla), and red bell peppers. This could make deoxyuridine a potential biomarker for the consumption of these foods.
Cytidine is a nucleoside that is composed of the base cytosine linked to the five-carbon sugar D-ribose. Cytidine is a pyrimidine that besides being incorporated into nucleic acids, can serve as a substrate for the salvage pathway of pyrimidine nucleotide synthesis. It is a precursor of cytidine triphosphate (CTP) needed in the phosphatidylcholine (PC) and phosphatidylethanolamine (PE) biosynthetic pathways. These variations probably reflect the species differences in cytidine deaminase, the enzyme that converts cytidine to uridine in the body. The transport of cytidine into the brain's extracellular fluid, and then into neurons and glia, are essential prerequisites for cytidine to be utilized in the brain. An efficient mechanism mediating the brain uptake of circulating cytidine has not yet been demonstrated. The biosynthesis of PC, the most abundant phosphatide in the brain, via the Kennedy pathway requires phosphocholine and cytidine triphosphate (CTP), a cytidine nucleotide involved in the rate-limiting step. The enzyme that converts CTP to endogenous CDP-choline (CTP:phosphocholine cytidylyltransferase) is unsaturated at physiological brain CTP levels. APOBEC is a family of enzymes that has been discovered with the ability to deaminate cytidines on RNA or DNA. The human apolipoprotein B mRNA-editing enzyme, catalytic polypeptide-like 3G protein (APOBEC3G, or hA3G), provides cells with an intracellular antiretroviral activity that is associated with the hypermutation of viral DNA through cytidine deamination. Indeed, hA3G belongs to a family of vertebrate proteins that contains one or two copies of a signature sequence motif unique to cytidine deaminases (CTDAs) (PMID: 16769123, 15780864, 16720547).
Thymidine, also known as deoxythymidine or deoxyribosylthymine or thymine deoxyriboside, is a pyrimidine deoxynucleoside. It consists of the nucleobase thymine attached to deoxyribose through a beta N- glycosidic bond. Thymidine also belongs to the class of organic compounds known as pyrimidine 2'-deoxyribonucleosides. Pyrimidine 2'-deoxyribonucleosides are compounds consisting of a pyrimidine linked to a ribose which lacks a hydroxyl group at position 2. Deoxythymidine (or thymidine) is the DNA nucleoside T, which pairs with deoxyadenosine (A) in double-stranded DNA. Therefore, thymidine is essential to all life. Indeed, thymidine exists in all living species, ranging from bacteria to plants to humans. Within humans, thymidine participates in a number of enzymatic reactions. In particular, thymidine can be biosynthesized from 5-thymidylic acid through its interaction with the enzyme cytosolic purine 5'-nucleotidase. In addition, thymidine can be converted into 5-thymidylic acid; which is catalyzed by the enzyme thymidine kinase. Deoxythymidine can be phosphorylated with one, two or three phosphoric acid groups, creating dTMP (deoxythymidine monophosphate), dTDP, or dTTP (for the di- and tri- phosphates, respectively). dTMP can be incorporated into DNA via DNA polymerases. In cell biology, thymidine can be used to synchronize the cells in S phase. Derivatives of thymidine are used in a number of drugs, including Azidothymidine (AZT), which is used in the treatment of HIV infection. AZT inhibits the process of reverse transcription in the human immunodeficiency virus.
Isopentenyl pyrophosphate, IPP or isopentenyl diphosphate, is an intermediate in the HMG-CoA reductase pathway used by organisms in the biosynthesis of terpenes and terpenoids. IPP is formed from Mevalonate-5-pyrophosphate, in a reaction catalyzed by the enzyme mevalonate-5-pyrophosphate decarboxylase. (wikipedia).
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).
Niacinamide, also known as nicotinamide (NAM), is a form of vitamin B3 found in food and used as a dietary supplement and medication. Niacinamide belongs to the class of organic compounds known as nicotinamides. These are heterocyclic aromatic compounds containing a pyridine ring substituted at position 3 by a carboxamide group. Its primary significance is in the prevention and/or cure of blacktongue and pellagra. The structure of nicotinamide consists of a pyridine ring to which a primary amide group is attached in the meta position. It is an amide of nicotinic acid. As an aromatic compound, it undergoes electrophilic substitution reactions and transformations of its two functional groups. Niacinamide and phosphoribosyl pyrophosphate can be converted into nicotinic acid mononucleotide and phosphate by the enzyme nicotinamide phosphoribosyltransferase. In humans, niacinamide is involved in the metabolic disorder called the nad+ signalling pathway (cancer). Niacinamide is an odorless tasting compound. Outside of the human body, niacinamide is found, on average, in the highest concentration within a few different foods, such as common sages, cow milk, and cocoa beans and in a lower concentration in common pea. Niacinamide has also been detected, but not quantified in several different foods, such as yardlong beans, roselles, apples, oyster mushrooms, and swiss chards. Niacinamide occurs in trace amounts mainly in meat, fish, nuts, and mushrooms, as well as to a lesser extent in some vegetables. It is commonly added to cereals and other foods. Many multivitamins contain 20–30 mg of vitamin B3 and it is also available in higher doses. Most animals cannot manufacture this compound in amounts sufficient to prevent nutritional deficiency and it therefore must be supplemented through dietary intake.
PC(20:0/20:4(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(20:0/20:4(5Z,8Z,11Z,14Z)), in particular, consists of one chain of arachidic acid at the C-1 position and one chain of arachidonic acid at the C-2 position. The arachidic acid moiety is derived from peanut oil, 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(15:0/18:4(6Z,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(15:0/18:4(6Z,9Z,12Z,15Z)), in particular, consists of one chain of pentadecanoic acid at the C-1 position and one chain of stearidonic acid at the C-2 position. The pentadecanoic acid moiety is derived from dairy products and milk fat, while the stearidonic 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.
12-HPETE is one of the six monohydroperoxy fatty acids produced by the non-enzymatic oxidation of arachidonic acid (Leukotrienes). Reduction of the hydroperoxide yields the more stable hydroxyl fatty acid (+/-)12-HETE. A family of biologically active compounds derived from arachidonic acid by oxidative metabolism through the 5-lipoxygenase pathway. They participate in host defense reactions and pathophysiological conditions such as immediate hypersensitivity and inflammation. They have potent actions on many essential organs and systems, including the cardiovascular, pulmonary, and central nervous system as well as the gastrointestinal tract and the immune system.
5-hydroxyeicosatetraenoic acid (5-HETE) is an endogenous eicosanoid. 5-HETE is an intermediate in arachidonic acid metabolism. It is converted from 5(S)-HPETE via the enzyme glutathione peroxidase (EC 1.11.1.9)and then converted to 5-OxoETE. It is also involved in the pathway of leukotriene synthesis. In addition, it is a modulator of tubuloglomerular feedback.
Adrenic acid, also known as 7,10,13,16-docosatetraenoic acid or adrenate, 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. Adrenic acid is practically insoluble (in water) and a weakly acidic compound (based on its pKa). Adrenic acid can be found in blood and in human myelin tissue. Within the cell, adrenic acid is primarily located in the cytoplasm, in the membrane (predicted from logP), and in the peroxisome. It can also be found in the extracellular space. In humans, adrenic acid is involved in alpha-linolenic acid and linoleic acid metabolism. Docosatetraenoic acid designates any straight chain 22:4 fatty acid. In particular, all-cis-7,10,13,16-docosatetraenoic acid is an ω-6 fatty acid with the trivial name adrenic acid (AdA). This is a naturally occurring polyunsaturated fatty acid formed through a 2-carbon chain elongation of arachidonic acid. It is one of the most abundant fatty acids in the early human brain. This unsaturated fatty acid is also metabolized by cells into biologically active products, such as dihomoprostaglandins and dihomo-epoxyeicosatrienoic acids (dihomo-EETs) (Wikipedia). Adrenic acid, which is a prostacyclin inhibitor, appears to be a potential prothrombotic agent (PMID: 1642692).
Dihomo-alpha-linolenic acid, also known as 11,14,17-eicosatrienoic acid, is a rare polyunsaturated fatty acid of the omega-3 series. In normal humans, it represents less than 0.25% of serum phospholipid fatty acids. However, it is one of the most active essential fatty acids when assayed for the inhibition of fatty acid elongation/desaturation reactions which convert dietary C-18 fatty acids to C-20 eicosanoid precursors. (http://www.caymanchem.com)
Lithocholic acid glycine conjugate is an acyl glycine and a bile acid-glycine conjugate. 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). 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).
Ursodeoxycholic acid, also known as ursodeoxycholate or acid deoxyursocholic, belongs to the class of organic compounds known as dihydroxy bile acids, alcohols and derivatives. Dihydroxy bile acids, alcohols and derivatives are compounds containing or derived from a bile acid or alcohol, and which bears exactly two carboxylic acid groups. Ursodeoxycholic acid is a very hydrophobic molecule, practically insoluble in water, and relatively neutral.
Glycoursodeoxycholic acid 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). 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).
Heptyl ketone belongs to the family of Ketones. These are organic compounds  in which a carbonyl group is bonded to two carbon atoms R2C=O (neither R may be H).
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.
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
Metaraminol is only found in individuals that have used or taken this drug. It is an adrenergic agonist that acts predominantly at alpha adrenergic receptors and also stimulates the release of norepinephrine. It has been used primarily as a vasoconstrictor in the treatment of hypotension. [PubChem]Metaraminol acts through peripheral vasoconstriction by acting as a pure alpha-1 adrenergic receptor agonist, consequently increasing systemic blood pressure (both systolic &amp; diastolic). Its effect is thought to be associated with the inhibition of adenyl cyclase which leads to an inhibition of the production of cAMP. Another effect of Metaraminol is that it releases norepinephrine from its storage sites indirectly.
6-O-Acetylaustroinulin is isolated from Stevia rebaudiana (stevia).
Mianserin is only found in individuals that have used or taken this drug. It is a tetracyclic compound with antidepressant effects. Mianserin was previously available internationally, however in most markets it has been phased out in favor of Mirtazapine.Mianserin's mechanism of therapeutic action is not well understood, although it apparently blocks alpha-adrenergic, histamine H1, and some types of serotonin receptors.
Bisnorcholic acid is one of a number of short side bile acids found in the urine from patients with cerebrotendinous xanthomatosis (CTX). The presence these short side bile acids in urine of the CTX patients suggests that bile alcohols may be further degraded to these bile acids. (PMID: 2079611).
Orphenadrine is only found in individuals that have used or taken this drug. It is a muscarinic antagonist used to treat drug-induced parkinsonism and to relieve pain from muscle spasm. [PubChem]Orphenadrine binds and inhibits both histamine H1 receptors and NMDA receptors. It restores the motor disturbances induced by neuroleptics, in particular the hyperkinesia. The dopamine deficiency in the striatum increases the stimulating effects of the cholinergic system. This stimulation is counteracted by the anticholinergic effect of orphenadrine. It may have a relaxing effect on skeletal muscle spasms and it has a mood elevating effect.
Mebendazole is only found in individuals that have used or taken this drug. It is a benzimidazole that acts by interfering with carbohydrate metabolism and inhibiting polymerization of microtubules. [PubChem]Mebendazole causes degenerative alterations in the tegument and intestinal cells of the worm by binding to the colchicine-sensitive site of tubulin, thus inhibiting its polymerization or assembly into microtubules. The loss of the cytoplasmic microtubules leads to impaired uptake of glucose by the larval and adult stages of the susceptible parasites, and depletes their glycogen stores. Degenerative changes in the endoplasmic reticulum, the mitochondria of the germinal layer, and the subsequent release of lysosomes result in decreased production of adenosine triphosphate (ATP), which is the energy required for the survival of the helminth. Due to diminished energy production, the parasite is immobilized and eventually dies.
1-Phenylethylamine, or alpha-phenethylamine, is an amine. Individual enantiomers of this basic compound are useful for performing chiral resolution of acidic compounds by forming diastereomeric salts. -- Wikipedia.
2,8-Dihydroxyadenine is a Purine metabolite usually not detectable in biofluids of normal individuals; this insoluble metabolite (at physiological urinary pH) cause urinary tract calculi and arthritis, and is identified in Adenine phosphoribosyltransferase deficiency (APRT, OMIM 102600). (PMID 16613999) In APRT, 2,8-dihydroxyadenine (DHA) accumulates in crystals within the tubular lumens (a feature of many kidney stone diseases) creating crystal-induced injury in human kidney epithelial cells. (PMID 16374038) Urinary DHA crystals are easily recognized under a microscope, and effective treatment can be offered and therefore the prognosis depends upon the renal function at diagnosis; treatment consists of adequate fluid intake, a low-purine diet and administration of allopurinol. (PMID 15764278).
deaminated metabolite of glutamine in csf of patients with hepatic coma; intermediate in the detoxification of ammonia in brain; structure.
2-Methylpropanal, also known as isobutylaldehyde or isobutyral, belongs to the class of organic compounds known as short-chain aldehydes. These are aldehydes with a chain length between 2 and 5 carbon atoms. 2-Methylpropanal exists in all eukaryotes, ranging from yeast to humans. 2-Methylpropanal is an aldehydic, floral, and fresh tasting compound. 2-Methylpropanal is found, on average, in the highest concentration within milk (cow). 2-Methylpropanal has also been detected, but not quantified, in several different foods, such as greenthread tea, wheats, common grapes, other cereal products, and oxheart cabbages.
3-Methyldioxyindole is a metabolite of aldehyde dehydrogenase (NAD+) (K00128)(EC 1.2.1.3) formed during 3-methylindole metabolism (PMID: 88251990). It is the major urinary metabolite of 3-methylindole. (PMID: 2519781). It is thought that 3-Methyldioxyindole is an in vivo oxidation product of 3-methylindole which is a metabolic product of tryptophan, produced by bacteria in the colon (PMID: 2796599).
3-Methylene-indolenine is an electrophilic molecule produced by the action of cytochrome P450 2F1 on 3-methylindole (3MI). 3-Methylindole (3MI) is a naturally occurring pulmonary toxin that requires metabolic activation. In particular, 3MI-induced pneumotoxicity arises from cytochrome P-450-catalyzed dehydrogenation of 3MI to an electrophilic methylene imine (3-methyleneindolenine), which covalently binds to cellular macromolecules. Members of the CYP2F gene subfamily are selectively expressed in lung tissues and have been implicated as important catalysts in the formation of reactive intermediates from several pneumotoxic chemicals. (PMID: 10383923).
3-Methyluridine is a modified nucleoside of cellular RNA. All modifications are formed post-transcriptionally in RNA from the normal nucleosides by modifying enzymes, especially specific RNA-methyltransferases and RNA-synthetases. Due to the lack of specific phosphorylases for modified nucleosides they cannot be recycled for synthesizing RNA, so they are excreted quantitatively in urine. (PMID 15906010).
3-O-Methyl-a-methyldopa 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)
Because of its ability to mimic a low energy status of the cell, the cell-permeable nucleoside 5-aminoimidazole-4-carboxamide (AICA) riboside was proposed as an antineoplastic agent switching off major energy-consuming processes associated with the malignant phenotype (lipid production, DNA synthesis, cell proliferation, cell migration, etc.). Key to the antineoplastic action of AICA riboside is its conversion to ZMP, an AMP mimetic that at high concentrations activates the AMP-activated protein kinase (AMPK). (PMID: 16985054).
Formation of 8-hydroxyguanine (8-OHG), a mutagenic base which is a marker for OH-mediated DNA damage, requires peroxidase and halides and occurs in the presence of transition metal chelators (DTPA +/- desferrioxamine), and is inhibited by catalase, superoxide dismutase (SOD), and scavengers of hypohalous acids. (PMID 10820020). 8-Hydroxyguanine is an oxidative stress marker for diagnosis of Alzheimer's disease (AD). (PMID 15977989).
Cytosine, also known as C, belongs to the class of organic compounds known as pyrimidones. Pyrimidones are compounds that contain a pyrimidine ring, which bears a ketone. Pyrimidine is a 6-membered ring consisting of four carbon atoms and two nitrogen centers at the 1- and 3- ring positions. Cytosine is also classified as a pyrimidine derivative, with a heterocyclic aromatic ring and two substituents attached (an amine group at position 4 and a keto group at position 2). Cytosine is one of the four main bases found in DNA and RNA, along with adenine, guanine, and thymine (uracil in RNA). The nucleoside of cytosine is cytidine. In Watson-Crick base pairing, cytosine forms three hydrogen bonds with guanine. Cytosine was discovered and named by Albrecht Kossel and Albert Neumann in 1894 when it was hydrolyzed from calf thymus tissues. Cytosine exists in all living species, ranging from bacteria to plants to humans. Within cells, cytosine can undergo several enzymatic reactions. It can be methylated into 5-methylcytosine by an enzyme called DNA methyltransferase (DNMT) or be methylated and hydroxylated to make 5-hydroxymethylcytosine. The DNA methyltransferase (DNMT) family of enzymes transfer a methyl group from S-adenosyl-l-methionine (SAM) to the 5‚Äô carbon of cytosine in a molecule of DNA. High levels of cytosine can be found in the urine of individuals with severe combined immunodeficiency syndrome (SCID). Cytosine concentrations as high as (23-160 mmol/mol creatinine) were detected in SCID patients compared to normal levels of <2 mmol/mol creatinine (PMID: 262183).
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.
Glycyl-Arginine is a dipeptide composed of glycine 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. This dipeptide has not yet been identified in human tissues or biofluids and so it is classified as an 'Expected' metabolite.
Glycyl-Lysine is a dipeptide composed of glycine 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. This dipeptide has not yet been identified in human tissues or biofluids and so it is classified as an 'Expected' metabolite.
Glycylproline is a dipeptide composed of glycine and proline, and is an end product of collagen metabolism that is further cleaved by prolidase (EC 3.4.13.9). The resulting proline molecules are recycled into collagen or other proteins. Prolidase deficiency is a rare autosomal recessive disease characterized by chronic ulcerative dermatitis, mental retardation, frequent infections, and massive urinary excretion of iminodipeptides. Patients with this disease have reportedly decreased prolidase enzyme activity against glycylproline (Gly-Pro). The enzyme's activity against other substrates is not as affected. Some patients with prolidase deficiency have a marked urinary excretion of glycylproline. Patients with pressure sores contain significantly more urinary glycylproline than the control (PMID: 16009141, 7629169, 1536787, 10582130).
L-homoarginine, also known as N6-(aminoiminomethyl)-L-lysine or N6-amidino-L-lysine, 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. More specifically, L-homoarginine is a naturally occurring, non-proteinogenic, cationic amino acid. It is formed in the liver in a reaction catalyzed by L-arginine:glycine amidinotransferase (AGAT) when transferring the amidino group from arginine to lysine. It is an alternative substrate for nitric oxide (NO) synthase. L-homoarginine increases the availability of NO and thereby affects endothelial function. High homoarginine levels may exert positive actions that are relevant to cardiovascular health, including enhanced endothelial function, inhibition of platelet aggregation and stimulation of insulin secretion (PMID: 30866658). Recent studies have demonstrated that low serum homoarginine levels are a strong predictor of cardiovascular mortality (PMID: 24583919). L-homoarginine is a substrate of the human cationic amino acid CAT1 [solute carrier family 7 (SLC7A1)], CAT2A (SLC7A2A) or CAT2B (SLC7A2B) (PMID: 28684763). According to published human metabolomic data, L-homoarginine can be found primarily in blood, cerebrospinal fluid (CSF), and urine, as well as in human intestinal and testes tissues. Moreover, L-homoarginine has been found to be associated with liver cirrhosis and the genetic disorder, hyperargininemia. Homoarginine is an organ-specific uncompetitive inhibitor of human liver and bone alkaline phosphohydrolase (PMID: 5063678).
Indole-3-carboxylic acid, also known as 3-carboxyindole or 3-indolecarboxylate, belongs to the class of organic compounds known as indolecarboxylic acids and derivatives. Indolecarboxylic acids and derivatives are compounds containing a carboxylic acid group (or a derivative thereof) linked to an indole. Naphthylmethylindoles: Any compound containing a 1H-indol-3-yl-(1-naphthyl)methane structure with substitution at the nitrogen atom of the indole ring by an alkyl, haloalkyl, alkenyl, cycloalkylmethyl, cycloalkylethyl, 1-(N-methyl-2-piperidinyl)methyl, or 2-(4-morpholinyl)ethyl group whether or not further substituted in the indole ring to any extent and whether or not substituted in the naphthyl ring to any extent. One example given is JWH-250. Outside of the human body, indole-3-carboxylic acid has been detected, but not quantified in several different foods, such as brassicas, broccoli, pulses, common beets, and barley. This could make indole-3-carboxylic acid a potential biomarker for the consumption of these foods. Notice the pentyl group substituted onto the nitrogen atom of the indole ring. Note that this definition encompasses only those compounds that have OH groups attached to both the phenyl and the cyclohexyl rings, and so does not include compounds such as O-1871 which lacks the cyclohexyl OH group, or compounds such as JWH-337 or JWH-344 which lack the phenolic OH group.
Gulose is an aldohexose sugar and a C-3 epimer of galactose. It is an unnatural monosaccharide that exists as a syrup with a sweet taste. It is soluble in water and slightly soluble in methanol. Both the D- and L-forms are not fermentable by yeast. L-gulose is an L-hexose sugar and an intermediate in the biosynthesis of L-Ascorbate (vitamin C). It can be oxidized to L-guluno-1-4-lactone and it is also produced by the hydrolysis of L-gulose-1-P. Vitamic C is an important antioxidant and an enzyme cofactor. Higher plants and higher animals (but not humans) can synthesize ascorbate. Plants provide the major dietary vitamin C source for humans. The plant ascorbate biosynthesis pathways have only been recently proposed and they differ from what was found in mammals. Gulose has been found to be a metabolite of Ketogulonicigenium (PMID: 15785002).
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.
Metenamine belongs to the family of Aminals. These are organic compounds containing the aminal functional group
6-Methyladenine is a methylated adenine residue. The formation of internal 6-methyladenine (m6A) residues in eucaryotic messenger RNA (mRNA) is a postsynthetic modification in which S-adenosyl-L-methionine (SAM) serves as the methyl donor. 6-Methyladenine residues have also been localized to heterogeneous nuclear RNA (HnRNA), and for the most part these residues are conserved during mRNA processing. Although the biological significance of internal adenine methylation in eucaryotic mRNA remains unclear, a great deal of research has indicated that this modification may be required for mRNA transport to the cytoplasm, the selection of splice sites or other RNA processing reactions. The presence of m6A residues increases the in vitro translation efficiency of dihydrofolate reductase; an inhibition of m6A residues in dihydrofolate reductase transcripts significantly alters their rate of translation. m6A is found in many human fluids: oviductal fluid, blood plasma and urine (PMID:1551452, 8925412, 10481270, 16083005, 16684535, 3506820, 3728186).
Metoprolol is a selective beta1 receptor blocker used in treatment of several diseases of the cardiovascular system. It is marketed under the brand name Lopressor by Novartis, and Toprol (in the USA); Seleken or Selokeen (elsewhere); A selective adrenergic beta-1-blocking agent with no stimulatory action. It's binding to plasma albumin is weaker than alprenolol and it may be useful in the treatment of several diseases of the cardiovascular system; Metoprolol is a selective beta1 receptor blocker used in treatment of several diseases of the cardiovascular system. It is marketed under the brand name Lopressor by Novartis, and Toprol (in the USA); Seleken or Selokeen (elsewhere); as Minax by Alphapharm (in Australia), as Betaloc by AstraZeneca and as Corvitol by Berlin-Chemie AG; A selective adrenergic beta-1-blocking agent with no stimulatory action. It's binding to plasma albumin is weaker than alprenolol and it may be useful in angina pectoris, hypertension, or cardiac arrhythmias; as Minax by Alphapharm (in Australia), as Betaloc by AstraZeneca and as Corvitol by Berlin-Chemie AG.
N-debutylhalofantrine is a metabolite of halofantrine. Halofantrine is a drug used to treat malaria. Halofantrine's structure contains a substituted phenanthrene, and is related to the antimalarial drugs quinine and lumefantrine. Marketed as Halfan, halofantrine is never used to prevent malaria and its mode of action is unknown. A crystallographic study have shown that halofantrine binds to hematin in vitro, suggesting a possible mechanism of action. (Wikipedia)
1-Pyrimidinylpiperazine is a metabolite of buspirone. Buspirone is an anxiolytic psychoactive drug of the azapirone chemical class, and is primarily used to treat generalized anxiety disorder (GAD) Bristol-Myers Squibb (BMS) gained FDA approval of buspirone in 1986 for treatment of GAD. The patent on Buspar by Bristol-Myers Squibb expired in 2001, and buspirone is available as a generic. (Wikipedia)
4-aminophenol is considered a minor nephrotoxic metabolite of phenacetin and acetaminophen (paracetamol) in man. 4-Aminophenol can undergo autoxidations and metal-catalyzed and enzymatic oxidations in man to produce reactive oxygen species. (PMID 1713494).
L-3-Aminodihydro-2(3H)-furanone is found in pulses. L-3-Aminodihydro-2(3H)-furanone is a constituent of pea Pisum sativum seedlings
Butabarbital (trade name Butisol) is a prescription barbiturate sleep aid. Butabarbital has a particularly fast onset of effects and short duration of action compared to other barbiturates, which makes it useful for certain applications such as treating severe insomnia and relieving anxiety before surgical procedures; however it is also relatively dangerous particularly when combined with alcohol, and so is now rarely used, although it is still prescribed in some Eastern European and South American countries. Its short duration of action gives butabarbital a high abuse potential, comparable to secobarbital. [Wikipedia]
Methylphenobarbital is only found in individuals that have used or taken this drug. It is a barbiturate that is metabolized to phenobarbital. It has been used for similar purposes, especially in epilepsy, but there is no evidence mephobarbital offers any advantage over phenobarbital. [PubChem]Methylphenobarbital 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.
Amobarbital is only found in individuals that have used or taken this drug. It is a barbiturate with hypnotic and sedative properties (but not antianxiety). Adverse effects are mainly a consequence of dose-related CNS depression and the risk of dependence with continued use is high. (From Martindale, The Extra Pharmacopoeia, 30th ed, p565)Amobarbital (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. Amobarbital also appears to bind neuronal nicotinic acetylcholine receptors.
4-Oxoretinal is a predominant retinoids during morphogenesis in mouse skin in vivo. Topical 4-oxoretinal and 4-oxoretinol promoted significant epidermal hyperplasia and metaplasia in mouse tail. They induced a moderate response for epidermal inflammation, compared with retinal, whereas neither 4-oxoretinal nor 4-oxoretinol prevented menadione-induced epidermal lipid peroxidation, unlike retinal and retinol. As analyzed by quantitative PCR, 4-oxoretinal and 4-oxoretinol did not reproduce the significant increased expression of genes coding for keratin 4, amphiregulin, heparin-EGF and CYP26A1, that did induce retinal and retinol. However, both retinal and 4-oxoretinal significantly inhibited the lipopolysaccharide-induced maturation of human dendritic cells in vitro. As analyzed in vivo and in vitro, 4-oxoretinal and 4-oxoretinol were not converted into retinoic acid. We conclude that 4-oxoretinal and 4-oxoretinol exert a moderate direct retinoid-like activity in vivo, thus confirming previous in vitro studies in amphibians showing 4-oxometabolites of vitamin A as bioactive agents rather than inactive catabolites.
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.↵↵↵
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.
N(omega)-Hydroxyarginine is a product of the arginine-nitric oxide pathway, and is the first intermediate in the process catalyzed by nitric oxide synthase (NOS) (EC 1.14.13.99). NOS is a heme protein that catalyzes the oxygenation of L-arginine in the presence of NADPH to form nitric oxide and citrulline. N(omega)-Hydroxyarginine appears to interfere with cell proliferation/cell growth by inhibiting arginase, a binuclear Mn(2+) metalloenzyme that catalyzes the hydrolysis of L-arginine to L-ornithine and urea (EC 3.5.3.1). Arginase has 6R-tetrahydrobiopterin (H4B) as an enzyme-bound cofactor (PMID: 11259671, 11258880, 14504282, 9735327).
Irinotecan is an antineoplastic enzyme inhibitor primarily used in the treatment of colorectal cancer. It is a derivative of camptothecin that inhibits the action of topoisomerase I. Irinotecan prevents religation of the DNA strand by binding to topoisomerase I-DNA complex, and causes double-strand DNA breakage and cell death.
Flavouring ingredient. It is used to modify the flavour of products acidified/preserved with acetic acid. It is used in preference to Sodium acetate <ht>KBX76-W</ht> for low-Na foods. Potassium acetate (CH3COOK) is a chemical compound.
Ibuprofen is a nonsteroidal anti-inflammatory drug (NSAID) widely marketed under various trademarks including Act-3, Advil, Brufen, Motrin, Nuprin, and Nurofen. It is used for relief of symptoms of arthritis, primary dysmenorrhoea, and fever; Ibuprofen is an NSAID which is believed to work through inhibition of cyclooxygenase (COX), thus inhibiting prostaglandin synthesis. There are at least 2 variations of cyclooxygenase (COX-1 and COX-2), ibuprofen inhibits both COX-1 and COX-2. It appears that its analgesic, antipyretic, and anti-inflammatory activity are achieved principally through COX-2 inhibition; whereas COX-1 inhibition is responsible for its unwanted effects on platelet aggregation and the GI mucosa. As with other NSAIDs, ibuprofen inhibits platelet aggregation, but is not used therapeutically for this action since it is a minor and reversible effect. -- Wikipedia.
Adenine is a purine base. Adenine is found in both DNA and RNA. Adenine is a fundamental component of adenine nucleotides. Adenine forms adenosine, a nucleoside, when attached to ribose, and deoxyadenosine when attached to deoxyribose; it forms adenosine triphosphate (ATP), a nucleotide, when three phosphate groups are added to adenosine. Adenosine triphosphate is used in cellular metabolism as one of the basic methods of transferring chemical energy between chemical reactions. Purine inborn errors of metabolism (IEM) are serious hereditary disorders, which should be suspected in any case of neonatal fitting, failure to thrive, recurrent infections, neurological deficit, renal disease, self-mutilation and other manifestations. Investigation usually starts with uric acid (UA) determination in urine and plasma. (OMIM 300322, 229600, 603027, 232400, 232600, 232800, 201450, 220150, 232200, 162000, 164050, 278300). (PMID: 17052198, 17520339).
Angiotensin I appears to have no biological activity and exists solely as a precursor to angiotensin 2. Angiotensin I is formed by the action of renin on angiotensinogen. Renin cleaves the peptide bond between the leucine (Leu) and valine (Val) residues on angiotensinogen, creating the ten-amino acid peptide (des-Asp) angiotensin I. Renin is produced in the kidneys in response to renal sympathetic activity, decreased intrarenal blood pressure at the juxtaglomerular cells, or decreased delivery of Na+ and Cl- to the macula densa.[3] If less Na+ is sensed by the macula densa, renin release by juxtaglomerular cells is increased. (Wikipedia)
In contrast to previous adult studies on urinary metabolites, plasma carboxyphosphamide concentrations did not support the existence of polymorphic metabolism. Plasma concentrations of dechlorethylcyclophosphamide and carboxyphosphamide were correlated in individual patients, suggesting that the activity of both aldehyde dehydrogenase and cytochrome P450 enzyme(s) determine carboxyphosphamide production in vivo. (PMID: 7850793) Detoxification of cyclophosphamide is effected, in part, by hepatic class 1 aldehyde dehydrogenase (ALDH-1)-catalyzed oxidation of aldophosphamide, a pivotal aldehyde intermediate, to the nontoxic metabolite, carboxyphosphamide. (PMID: 9394035) A key finding was the detection of a metabolite, most likely carboxyphosphamide, that is formed only by cytosols from cells expressing either class 3 or class 1 ALDH. (PMID: 8662659)
Measurement of this acid in the urine after oral administration of histidine provides the basis for the diagnostic test of folic acid deficiency and of megaloblastic anemia of pregnancy.
Preservative. Monosodium citrate, or sodium dihydrogen citrate, is an acid salt with the chemical formula NaH2C6H5O7, or C3H4OH(COOH)2COONa. Since it has two remaining open spots on the citrate anion, it is used as a relatively strong sequestrant. It is used to prevent platelet clumping in blood samples. It is one of the 3 citric acid salts.
Austin is a mycotoxin produced by the food storage mould (Aspergillus ustus). These are sesquiterpenes containing a lactone ring.
Benzyl acetate, also known as benzyl ethanoate or fema 2135, belongs to the class of organic compounds known as benzyloxycarbonyls. These are organic compounds containing a carbonyl group substituted with a benzyloxyl group. Benzyl acetate is a sweet, apple, and apricot tasting compound. Benzyl acetate is found, on average, in the highest concentration within sweet basils. Benzyl acetate has also been detected, but not quantified, in several different foods, such as figs, fruits, pomes, tea, and alcoholic beverages. On high concnetrations benzyl acetate is a potentially toxic compound. If the compound has entered the eyes, they should be washed with large quantities of isotonic saline or water.
(+)-3-Thujone is found in common sage. Thujone is a ketone and a monoterpene that occurs naturally in two diastereomeric forms: (-)-alpha-thujone and (+)-beta-thujone. It has a menthol odor. In addition to (-)-alpha-thujone and (+)-beta-thujone, there are their enantiomeric forms, (+)-alpha-thujone and (-)-beta-thujone. (Wikipedia
7-Dehydrocholesterol (7-DHC), also known as provitamin D3 or 5,7-cholestadien-3-b-ol, belongs to the class of organic compounds known as cholesterols and derivatives. Cholesterols and derivatives are compounds containing a 3-hydroxylated cholestane core. Thus, 7-dehydrocholesterol is also classified as a sterol. 7-Dehydrocholesterol is known as a zoosterol, meaning that it is a sterol isolated from animals (to distinguish those sterols isolated from plants which are called phytosterols). 7-DHC functions in the serum as a cholesterol precursor and is photochemically converted to vitamin D3 in the skin. Therefore 7-DHC functions as provitamin-D3. The presence of 7-DHC in human skin enables humans and other mammals to manufacture vitamin D3 (cholecalciferol) from ultraviolet rays in the sun light, via an intermediate isomer pre-vitamin D3. 7-DHC absorbs UV light most effectively at wavelengths between 290 and 320 nm and, thus, the production of vitamin D3 will occur primarily at those wavelengths (PMID: 9625080).  The two most important factors that govern the generation of pre-vitamin D3 are the quantity (intensity) and quality (appropriate wavelength) of the UVB irradiation reaching the 7-dehydrocholesterol deep in the stratum basale and stratum spinosum (PMID: 9625080). 7-DHC is also found in the milk of several mammalian species, including cows (PMID: 10999630; PMID: 225459). It was discovered by Nobel-laureate organic chemist Adolf Windaus. 7-DHC can be produced by animals and plants via different pathways (PMID: 23717318). It is not produced by fungi in significant amounts. 7-DHC is made by some algae and can also be produced by some bacteria.
3alpha,7alpha-Dihydroxy-5beta-cholestane is an intermediate in bile acid synthesis. 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).
Isoquercitrin is found in alcoholic beverages. Isoquercitrin occurs widely in plants. Isoquercitrin is present in red wine.Isoquercitin can be isolated from mangoes and from Rheum nobile, the Noble rhubarb or Sikkim rhubarb, a giant herbaceous plant native to the Himalaya. Quercetin glycosides are also present in tea. (Wikipedia
DG(18:2(9Z,12Z)/22:6(4Z,7Z,10Z,13Z,16Z,19Z)/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(18:2(9Z,12Z)/22:6(4Z,7Z,10Z,13Z,16Z,19Z)/0:0), in particular, consists of one chain of linoleic acid at the C-1 position and one chain of docosahexaenoic acid at the C-2 position. The linoleic acid moiety is derived from seed oils, while the docosahexaenoic acid moiety is derived from fish 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.
Glycerol alpha-monochlorohydrin is found in herbs and spices. By-product of vegetable protein hydrolysed by HCl. Identified in some soy sauce product
Norbuprenorphine is the primary active metabolite of buprenorphine. Norbuprenorphine acts as a Î¼-opioid, Î´-opioid, and nociceptin receptor full agonist, as well as a Îº-opioid receptor partial agonist. Norbuprenorphine crosses the blood-brain-barrier similarly to buprenorphine and likely contributes to its effects. It was observed that Intravenous administration of norbuprenorphine at 1 to 3 mg/kg decreased respiratory rate, whereas buprenorphine had no effect up to 3 mg/kg in rats. (Wikipedia)
Tauroursocholic acid is a bile acid 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).
N-methyl-2-pyridone-5-carboxamide (2PY) is one of the end products of nicotinamide-adenine dinucleotide (NAD) degradation. Increased serum 2PY concentrations are observed in chronic renal failure (CRF) patients, which along with the deterioration of kidney function and its toxic properties (significant inhibition of PARP-1), suggests that 2PY is an uremic toxin. (PMID 12694300). 2PY has been identified as a uremic toxin according to the European Uremic Toxin Working Group (PMID: 22626821).
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.
Endalin belongs to the family of Pyrimidine Nucleosides and Analogues. These are compounds comprising a pyrimidine base attached to a sugar.
Dexchlorpheniramine is the S-enantiomer of chlorphenamine (chloropheniramine) and is a first-generation alkylamine H1-antihistamine.
4-aminophenol is considered a minor nephrotoxic metabolite of phenacetin and acetaminophen (paracetamol) in man. 4-Aminophenol can undergo autoxidations and metal-catalyzed and enzymatic oxidations in man to produce reactive oxygen species. (PMID 1713494).
1,2-Diacylglycerol-LD-PI-pool, also known as PI or Carba0, is classified as a benzene or a Benzene derivative. Benzenes are aromatic compounds containing one monocyclic ring system consisting of benzene. 1,2-Diacylglycerol-LD-PI-pool is considered to be practically insoluble (in water) and basic.  1,2-Diacylglycerol-LD-PI-pool is a non-carcinogenic (not listed by IARC) potentially toxic compound
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.
Sulfamethizole is only found in individuals that have used or taken this drug. It is a sulfathiazole antibacterial agent. Sulfamethizole is a competitive inhibitor of bacterial enzyme dihydropteroate synthetase. The normal para-aminobenzoic acid (PABA) substrate is prevented from binding. The inhibited reaction is necessary in these organisms for the synthesis of folic acid.
Nutrient supplement. Iron(II) sulfate (Br.E. iron(II) sulphate) or ferrous sulfate is the chemical compound with the formula FeSO4. Known since ancient times as copperas and as green vitriol, the blue-green heptahydrate is the most common form of this material. All iron sulfates dissolve in water to give the same aquo complex [Fe(H2O)6]2+, which has octahedral molecular geometry and paramagnetic. Together with other iron compounds, ferrous sulfate is used to fortify foods and to treat iron-deficiency anemia.
Lucidenic acid D1 is found in mushrooms. Lucidenic acid D1 is a constituent of Ganoderma lucidum (reishi).
Glycopyrrolate is only found in individuals that have used or taken this drug. It is a synthetic anticholinergic agent with a quaternary ammonium structure. A muscarinic competitive antagonist used as an antispasmodic, in some disorders of the gastrointestinal tract, and to reduce salivation with some anesthetics. [PubChem]Glycopyrrolate binds competitively to the muscarinic acetylcholine receptor. Like other anticholinergic (antimuscarinic) agents, it inhibits the action of acetylcholine on structures innervated by postganglionic cholinergic nerves and on smooth muscles that respond to acetylcholine but lack cholinergic innervation. These peripheral cholinergic receptors are present in the autonomic effector cells of smooth muscle, cardiac muscle, the sinoatrial node, the atrioventricular node, exocrine glands and, to a limited degree, in the autonomic ganglia. Thus, it diminishes the volume and free acidity of gastric secretions and controls excessive pharyngeal, tracheal, and bronchial secretions.
cis-Miyabenol C is found in fennel. cis-Miyabenol C is a constituent of the fruit of Foeniculum vulgare (fennel).
Adrenosterone is a steroid hormone with weak androgenic effect. It was first isolated in 1936 from the adrenal cortex by Tadeus Reichstein at the Pharmaceutical Institute in the University of Basel. Originally, adrenosterone was called Reichstein's substance G.(Wikipedia). Andrenosterone is created from androst-4-ene-3,17-dione by the work of two enzymes, CYP11B (E1.14.15.4) and 11beta-hydroxysteroid dehydrogenase [EC:1.1.1.146].
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).
Norfluoxetine is a metabolite of fluoxetine. (S)-Norfluoxetine, also known as seproxetine, is a selective serotonin reuptake inhibitor (SSRI). It is the most important active metabolite of the widely used antidepressant fluoxetine but little is known about its pharmacological actions. Seproxetine was being investigated by Eli Lilly and Company as an antidepressant, however, a cardiac side effect was noted and development was discontinued (Wikipedia).
Nilutamide is an antineoplastic hormonal agent primarily used in the treatment of prostate cancer. Nilutamide is a pure, nonsteroidal anti-androgen with affinity for androgen receptors (but not for progestogen, estrogen, or glucocorticoid receptors). Consequently, Nilutamide blocks the action of androgens of adrenal and testicular origin that stimulate the growth of normal and malignant prostatic tissue. Prostate cancer is mostly androgen-dependent and can be treated with surgical or chemical castration. To date, antiandrogen monotherapy has not consistently been shown to be equivalent to castration.
Gibberellin A59 (GA59) belongs to the class of organic compounds known as C19-gibberellin 6-carboxylic acids. These are C19-gibberellins with a carboxyl group at the 6-position. Gibberellin A59 is found in pulses. Gibberellin A59 is a constituent of Canavalia gladiata (sword bean).
Methyleugenol, also known as 4-allylveratrole or eugenol methyl, belongs to the class of organic compounds known as dimethoxybenzenes. These are organic aromatic compounds containing a monocyclic benzene moiety carrying exactly two methoxy groups. FDA noted the action was despite its continuing stance that this substance does not pose a risk to public health under the conditions of its intended use. Methyleugenol is a sweet, anise, and apricot tasting compound. Methyleugenol is found, on average, in the highest concentration within a few different foods, such as allspices, tarragons, and sweet bay and in a lower concentration in sweet basils, rosemaries, and hyssops. Methyleugenol has also been detected, but not quantified, in several different foods, such as soy beans, evergreen blackberries, muskmelons, citrus, and pomes. This could make methyleugenol a potential biomarker for the consumption of these foods. As of October 2018, the US FDA withdrew authorization for the use of methyl eugenol as a synthetic flavoring substance for use in food because petitioners provided data demonstrating that these additives induce cancer in laboratory animals. Methyleugenol is formally rated as a possible carcinogen (by IARC 2B) and is also a potentially toxic compound. Methyl eugenol (allylveratrol) is a natural chemical compound classified as a phenylpropene, a type of phenylpropanoid. It is the methyl ether of eugenol and is important to insect behavior and pollination. Their ability to attract insects, particularly Bactrocera fruit flies was first noticed in 1915 by F. M. Howlett. The compound may have evolved in response to pathogens, as methyl eugenol has some antifungal activity. Methyl eugenol is found in a number of plants (over 450 species from 80 families including both angiosperm and gymnosperm families) and has a role in attracting pollinators. About 350 plant species have them as a component of floral fragrance.
ADP-mannose is one of the major substrates of human hydrolases. Nudix hydrolases catalyze the hydrolysis of a variety of nucleoside diphosphate derivatives, and ADP-sugar pyrophosphatase are non-specific nucleoside diphosphosugar or diphosphoalcohol (NDP-X) pyrophosphatases, which hydrolyse some nonreducing NDP-X substrates. It has been found in erythrocytes, placenta and liver. (PMID: 1128712, 10722730, 9693963).
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.
CDP-glucose is a substrate for Uridine diphosphate glucose pyrophosphatase.
Cdp-glycerol is part of the Purine metabolism, and Glycerophospholipid metabolism pathways. It is a substrate for: Manganese-dependent ADP-ribose/CDP-alcohol diphosphatase.
Glucosamine-1P is a substrate of enzyme UDP-N-acetylglucosamine diphosphorylase [EC 2.7.7.23] (KEGG).
2,3,6,7-Tetrahydro-7-methylcyclopent[b]azepin-8(1H)-one is found in alcoholic beverages. Proline-derived Maillard product with bitter taste. 2,3,6,7-Tetrahydro-7-methylcyclopent[b]azepin-8(1H)-one is present in roasted malt, wort and beer.
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).
The excellent tolerability of therapeutic doses of paracetamol (acetaminophen) is a major factor in the very wide use of the drug. The major problem in the use of paracetamol is its hepatotoxicity after an overdose. Hepatotoxicity has also been reported after therapeutic doses, but critical analysis indicates that most patients with alleged toxicity from therapeutic doses have taken overdoses. Importantly, prospective studies indicate that therapeutic doses of paracetamol are an unlikely cause of hepatotoxicity in patients who ingest moderate to large amounts of alcohol (PMID: 15733027). Single doses of paracetamol are effective analgesics for acute postoperative pain and give rise to few adverse effects (PMID: 14974073). Acetaminophen (AAP) overdose and the resulting hepatotoxicity is an important clinical problem. In addition, AAP is widely used as a prototype hepatotoxin to study mechanisms of chemical-induced cell injury and to test the hepatoprotective potential of new drugs and herbal medicines. Because of its importance, the mechanisms of AAP-induced liver cell injury have been extensively investigated and controversially discussed for many years (PMID: 16863451).
S-Aminoethyl-L-cysteine, also known as thialysine, is a toxic analog of the amino acid lysine in which the second carbon of the amino acid's R-group (side chain) has been replaced with a sulfur atom. 4-thialysine is a substrate of lysine 2,3-aminomutase.
trans-Nonachlor os one of the most common chlordane-related environmental contaminants. It is an organochlorine chemical, a class largely banned in the U.S. that builds up in the body over time, linked to cancer and reproductive harm. It is a bioaccumulating component of the pesticide chlordane, which can be detected in various environmental biota and in humans. Some studies also show that there is a dose-response relations between serum cencetrations of trans-nonachlor and the prevalence of diabetes. [PMID: 16801591]
Potential food contaminant arising from its use in epoxy resin coatings for cans, concrete vats and tanks, etc.
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.
3'-O-Methylguanosine 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, it 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).
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).
1H-Indole-2,3-dione belongs to the class of organic compounds known as indolines. These are compounds containing an indole moiety, which consists of pyrrolidine ring fused to benzene  to form 2,3-dihydroindole.
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.
mono-isopropyl-disopyramide is a metabolite of disopyramide. Disopyramide (trade names Norpace and Rythmodan) is an antiarrhythmic medication used in the treatment of Ventricular Tachycardia. It is a sodium channel blocker and therefor classified as a Class 1a anti-arrhythmic agent. ’ Disopyramide has a negative inotropic effect on the ventricular myocardium, significantly decreasing the contractility. ' Disopyramide also has an anticholinergic effect on the heart which accounts for many adverse side effects. (Wikipedia)
2,4-Dichlorophenol is a chlorinated organic chemical due to environmental exposure, that can be detected in breast milk. The free species of phenols and chlorinated organic appear to be most prevalent in milk. (PMID 16377264 ).
Nutrient supplement
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).
Tolterodine is only found in individuals that have used or taken this drug. It is an antimuscarinic drug that is used to treat urinary incontinence. Tolterodine acts on M2 and M3 subtypes of muscarinic receptors.Both tolterodine and its active metabolite, 5-hydroxymethyltolterodine, act as competitive antagonists at muscarinic receptors. This antagonism results in inhibition of bladder contraction, decrease in detrusor pressure, and an incomplete emptying of the bladder.
Demeclocycline is only found in individuals that have used or taken this drug. It is a tetracycline analog having a 7-chloro and a 6-methyl. Because it is excreted more slowly than tetracycline, it maintains effective blood levels for longer periods of time. [PubChem]Demeclocycline inhibits cell growth by inhibiting translation. It binds (reversibly) to the 30S and 50S ribosomal subunit and prevents the amino-acyl tRNA from binding to the A site of the ribosome, which impairs protein synthesis by bacteria. The binding is reversible in nature. The use in SIADH actually relies on a side-effect of tetracycline antibiotics; many may cause diabetes insipidus (dehydration due to the inability to concentrate urine). It is not completely understood why demeclocycline impairs the action of antidiuretic hormone, but it is thought that it blocks the binding of the hormone to its receptor.
Glutamyllysine is a dipeptide composed of glutamate and lysine, 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. Glutamyllysine 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. The absorption of glutamyllysine is facilitated by the human intestinal oligopeptide transporter (PEPT1) (PMID 16759105).
Artomunoxanthentrione is found in breadfruit. Artomunoxanthentrione is a constituent of Artocarpus communis (breadfruit).
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.
Famotidine is a histamine H2-receptor antagonist that inhibits stomach acid production, and is commonly used in the treatment of peptic ulcer disease (PUD) and gastroesophageal reflux disease (GERD/GORD). It is commonly marketed by Merck under the trade names Pepcidine and Pepcid.
N1-trans-Feruloylagmatine is found in cereals and cereal products. N1-trans-Feruloylagmatine is isolated from Triticum aestivum (wheat) exposed to low temps.
Clionasterol is a triterpenoid isolated from the Indian marine red alga Gracilaria edulis, the sponge Veronica aerophoba and the Kenyan Marine Green. Macroalga Halimeda macroloba. It is a potent inhibitor of complement component C1. (PMID 12624828).
Buffering agent; dough conditioner; dietary supplement. Magnesium lactate, the magnesium salt of lactic acid, is a mineral supplement.
Methazolamide is only found in individuals that have used or taken this drug. It is a potent carbonic anhydrase inhibitor that is used as a diuretic and in the treatment of glaucoma. [PubChem]Inhibition of carbonic anhydrase in the ciliary processes of the eye decreases aqueous humor secretion, presumably by slowing the formation of bicarbonate ions with subsequent reduction in sodium and fluid transport.
Levobunolol is only found in individuals that have used or taken this drug. It is a nonselective beta-adrenoceptor antagonist used in the treatment of glaucoma. [PubChem]Levobunolol's mechanism of action in reducing IOP is not clearly defined, but is believed to be due to a reduction of the production of aqueous humor via blockage of endogenous catecholamine-stimulated increases in cyclic adenosine monophosphate (AMP) concentrations within the ciliary processes.
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).
Red food colouring The source of this color is a picture of a "deep carmine pink" flower at the following website:; The source of this color is a watercolor color swatch called light carmine displayed at the following website:
4-(Methylnitrosamino)-1-(3-pyridyl)-1-butanone (also known as NNK) is a potent tobacco-specific nitrosamine derived from nicotine. It plays a key role in human tobacco-related cancers (PMID:24830349). NNK is found in cured tobacco and is also produced during its burning or combustion in cigarettes. NNK is abundantly present in cigarette smoke (20-280 ng/cigarette). Electronic cigarettes (e-cigarettes) do not convert nicotine to NNK due to their lower operating temperatures. NNK is a procarcinogen. This means it must be activated by cytochrome P450 enzymes (CYP2A6 and CYP2B6) to become a carcinogen (PMID:24830349). NNK can also be activated by myeloperoxidase (MPO) and epoxide hydrolase (EPHX1). All activation processes lead to the formation of 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanol from NNK, which is called NNAL (PMID:24830349). NNAL can be detoxified via glucuronidation via glucuronidases. Once NNK is activated to NNAL, this compound initiates a cascade of signalling pathways (for example ERK1/2, NF‚âà√≠‚Äö√†¬¥B, PI3K/Akt, MAPK, FasL, K-ras), resulting in uncontrolled cellular proliferation and tumorigenesis. NNK is known as a mutagen and can cause point mutations that affect cell growth proliferation and differentiation. NNK also targets the SULT1A1, TGF-beta, and angiotensin II genes. NNK plays a key role in gene silencing, gene modification, and carcinogenesis. NNK has been implicated in tumour promotion by activating nicotinic acetylcholine receptors (nAChRs) and ‚âà√≠‚Äö√¢¬ß-adrenergic receptors (‚âà√≠‚Äö√¢¬ß-AdrRs), leading to downstream activation of parallel signal transduction pathways that facilitate tumour progression (PMID:24830349). Antioxidants such as EGCG (from green tea) inhibit lung tumorigenesis by NNK.
Charantin, also known as naftidrofuryl or nafronyl, is a member of the class of compounds known as naphthalenes. Naphthalenes are compounds containing a naphthalene moiety, which consists of two fused benzene rings. Charantin is practically insoluble (in water) and a very strong basic compound (based on its pKa). Charantin can be found in bitter gourd, which makes charantin a potential biomarker for the consumption of this food product. Charantin is actually a 1:1 mixture of two steroidal saponins, beta-sitosteryl glucoside (C 35H 60O 6) and 5,25-stigmasteryl glucoside (C 35H 58O 6). It is a whitish crystalline substance, neutral and tasteless, melting at 266‚Äì268 ¬∞C. It is sparingly soluble in water or other highly polar solvents, as well as in apolar solvents like hexane, but is soluble in ether, ethanol and methanol, and can be efficiently extracted from the plant by pressurized ethanol or acetone at 100 ¬∞C .
11beta-Hydroxyprogesterone is a normal human metabolite. Plasma 11beta-Hydroxyprogesterone concentrations does not vary significantly as a function of age, sex, or phase of the menstrual cycle, in contrast to 17-hydroxyprogesterone. Increased plasma 11beta-Hydroxyprogesterone levels in late-onset adrenal 21-hydroxylase deficiency suggest a mild defect of the mineralocorticoid pathway. 21-hydroxylase deficiency (OMIM 201910) is probably the most frequent (if not the most frequent) autosomal recessive genetic disease, occurring in almost 1% of Caucasians and about 3% of Ashkenazi Jews. 21-hydroxylase deficiency is unusual among genetic diseases in that approximately 95% of the mutant alleles have apparently been generated by recombination between a normally active gene (CYP21) and a closely linked pseudogene (CYP21P). There are 4 recognized clinical forms of congenital adrenal hyperplasia, the majority of cases being associated with 21-hydroxylase deficiency: salt-wasting (SW), simple virilizing (SV), nonclassic (NC) late-onset (also called attenuated and acquired), and cryptic. (PMID: 3546944, 2537337). 11beta-hydroxyprogesterone acts as a mineralocorticoid agonist in stimulating Na+ absorption in mammalian principal cortical collecting duct cells.It activates the transiently expressed hMR in COS-7 cells in a dose-dependent manner (ED(50): 10(-8) M) and, like aldosterone, stimulated Ams I(sc) in mpkCCD(cl4) cells. Docking 11OHP within the hMR-ligand-binding domain homology model revealed that the agonist activity of 11OHP is caused by contacts between its 11 beta-hydroxyl group and Asn770. Furthermore, 11OHP was unable to activate the mutant hMR/N770A, in which Ala is substituted for Asn at position 770. These findings demonstrate that in the absence of the 21-hydroxyl group, the 11 beta-hydroxyl group can produce the contact with the hMR-Asn770 required for the hMR activation leading to stimulated Na(+) absorption.
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).
Mestranol is only found in individuals that have used or taken this drug. It is the 3-methyl ether of ethinyl estradiol. It must be demethylated to be biologically active. It is used as the estrogen component of many combination ORAL contraceptives. [PubChem]Mestranol is the 3-methyl ether of ethinylestradiol. Ethinylestradiol, is a synthetic derivative of estradiol. Ethinylestradiol is orally bio-active and the estrogen used in almost all modern formulations of combined oral contraceptive pills. It binds to (and activates) the estrogen receptor. Mestranol is a biologically inactive prodrug of ethinylestradiol to which it is demethylated in the liver with a conversion efficiency of 70%.Estrogens diffuse into their target cells and interact with a protein receptor. Target cells include the female reproductive tract, the mammary gland, the hypothalamus, and the pituitary. Estrogens increase the hepatic synthesis of sex hormone binding globulin (SHBG), thyroid-binding globulin (TBG), and other serum proteins and suppress follicle-stimulating hormone (FSH) from the anterior pituitary. The combination of an estrogen with a progestin suppresses the hypothalamic-pituitary system, decreasing the secretion of gonadotropin-releasing hormone (GnRH).
Broad- spectrum beta-lactam antibiotic similar in structure to the cephalosporins except for the substitution of an oxaazabicyclo moiety for the thiaazabicyclo moiety of certain cephalosporins. It has been proposed especially for the meningitides because it passes the blood-brain barrier and for anaerobic infections. [PubChem]
Lisuride is only found in individuals that have used or taken this drug. It is used for the management of Parkinson's Disease.Lisuride is an anti-Parkinson drug chemically related to the dopaminergic ergoline Parkinson's drugs. Lisuride binds to the 5-HT(1A) and 5-HT(2A/2C) receptors. It is also thought to bind to the dopamine receptor and to act as a dopamine agonist. Evidence has also emerged that Lisuride also binds to the Histamine H1 receptor. Lisuride is also used to lower prolactin and, in low doses, to prevent migraine attacks.
Methylnoradrenaline is a norepinephrine derivative used as a vasoconstrictor agent. -- Pubchem.
Pyrazine is found in fenugreek. Pyrazine is a maillard product In the Staedel-Rugheimer pyrazine synthesis (1876) 2-chloroacetophenone is reacted with ammonia to the amino ketone, then condensed and then oxidized to a pyrazine A variation is the Gutknecht Pyrazine Synthesis (1879) also based on this selfcondensation but differing in the way the alpha-ketoamine is synthesised (the chlorine compound in the above method is a lachrymatory agent); Pyrazine is a heterocyclic aromatic organic compound. Pyrazine is a symmetrical molecule with point group D2h. It is found in folic acid in the form of pterin. Derivatives like Phenazine are well known for their antitumor, antibiotic and diuretic activity. Pyrazine is less basic in nature than pyridine, pyridazine and pyrimidine. Tetramethylpyrazine (also known as ligustrazine) is reported to scavenge superoxide anion and decrease nitric oxide production in human polymorphonuclear leukocytes. Tetramethylpyrazine is also a component of some herbs in Traditional Chinese Medicine.
2-Hexanol, also known as hexan-2-ol, belongs to the class of organic compounds known as secondary alcohols. Secondary alcohols are compounds containing a secondary alcohol functional group, with the general structure HOC(R)(R') (R,R'=alkyl, aryl). 2-Hexanol is a very hydrophobic molecule, practically insoluble in water, and relatively neutral. Thus, 2-hexanol is considered to be a fatty alcohol lipid molecule. 2-Hexanol (or hexan-2-ol) is a six carbon alcohol in which the OH group is located on the second carbon atom. Its chemical formula is C6H14O or C6H13OH. 2-Hexanol is a chemical and winey tasting compound. 2-Hexanol is found, on average, in the highest concentration within safflowers. 2-Hexanol has also been detected, but not quantified, in several different foods, such as pepper (c. frutescens), tea, green bell peppers, corns, and orange bell peppers. This could make 2-hexanol a potential biomarker for the consumption of these foods. 2-Hexanol, with regard to humans, has been linked to the inborn metabolic disorder celiac disease. It is an isomer of the other hexanols. 2-Hexanol has a chiral center and can be resolved into enantiomers.
Stearoyl-CoA is a long-chain acyl CoA ester that acts as an intermediate metabolite in the biosynthesis of monounsaturated fatty acids; a critical committed step in the reaction is the introduction of the cis-configuration double bond into acyl-CoAs (between carbons 9 and 10). This oxidative reaction is catalyzed by the iron-containing, microsomal enzyme, stearoyl-CoA desaturase (SCD, EC 1.14.19.1). NADH supplies the reducing equivalents for the reaction, the flavoprotein is cytochrome b5-reductase and the electron carrier is the heme protein cytochrome b5. Stearoyl-CoA is converted into oleoyl-CoA and then used as a major substrate for the synthesis of various kinds of lipids including phospholipids, triglycerides, cholesteryl esters and wax esters. Oleic acid is the preferred substrate for acyl-CoA cholesterol acyltransferase (ACAT, EC 2.3.1.26) and diacylglycerol acyltransferase (DGAT, EC 2.3.1.20), the enzymes responsible for cholesteryl esters and triglycerides synthesis, respectively. In addition oleate is the major monounsaturated fatty acid in human adipose tissue and in the phospholipid of the red-blood-cell membrane. In the biosynthesis of sphinganine, stearoyl-CoA proceeds through the acyl-CoA + serine -> 3-keto-sphinganine -> sphinganine pathway, with the key enzyme being acyl-CoA serine acyltransferase (EC 2.3.1.50) to yield C20-(3-ketosphinganine) long-chain base. There is growing recognition that acyl-CoA esters could act as signaling molecules in cellular metabolism. (PMID: 12538075, 10998569, Prostaglandins Leukot Essent Fatty Acids. 2003 Feb;68(2):113-21.).
2-Phenoxyethanol is a flavouring ingredient [CCD].
This compound belongs to the family of Phenylpropanoic Acids. These are compounds whose structure contain a benzene ring conjugated to a propanoic acid.
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.
Asparaginylasparagine is a dipeptide composed of two asparagine 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.
Talbutal is only found in individuals that have used or taken this drug. It is a barbiturate with a short to intermediate duration of action. Talbutal is a schedule III drug in the U.S.Talbutal 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.
Diethylphosphate is product of metabolism and of environmental degradation of Chlorpyrifos (CPF; a commonly used diethylphosphorothionate organophosphorus (OP) insecticide) and are routinely measured in urine as biomarkers of exposure. (PMID: 17590257).
Calcipotriol is only found in individuals that have used or taken this drug. It is a synthetic derivative of calcitriol or Vitamin D.The precise mechanism of calcipotriol in remitting psoriasis is not well-understood. However, it has been shown to have comparable affinity with calcitriol for the Vitamin D receptor, while being less than 1% as active as the calcitriol in regulating calcium metabolism. The Vitamin D receptor (VDR) belongs to the steroid/thyroid receptor superfamily, and is found on the cells of many different tissues including the thyroid, bone, kindney, and T cells of the immune system. T cells are known to play a role in psoriasis, and it is thought that the binding of calcipotriol to the VDR modulates the T cells gene transcription of cell differentiation and proliferation related genes.
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.
8,11,14-Eicosatrienoic acid is a 20-carbon-chain omega-6 fatty acid, unsaturated at positions 8, 11, and 14. It differs from arachidonic acid (5,8,11,14-eicosatetraenoic acid) only at position 5. 8,11,14-Eicosatrienoic acid is also known as Dihomo-gamma-linolenic acid (DGLA). In physiological literature, it is given the name 20:3(n-6). DGLA is the elongation product of the 18 carbon gamma-linolenic acid (GLA). DGLA can be converted into prostaglandin E1 (PGE1). PGE1 inhibits platelet aggregation and also exerts a vasodilatory effect. DGLA competes with arachadonic acid for COX and lipoxygenase, inhibiting the production of arachadonic acid's eicosanoids.
Sodium ions are necessary for regulation of blood and body fluids, transmission of nerve impulses, heart activity, and certain metabolic functions. Physiologically, it exists as an ion in the body. Sodium is needed by animals, which maintain high concentrations in their blood and extracellular fluids, but the ion is not needed by plants. The human requirement for sodium in the diet is less than 500 mg per day, which is typically less than a tenth as much as many diets "seasoned to taste." Most people consume far more sodium than is physiologically needed. For certain people with salt-sensitive blood pressure, this extra intake may cause a negative effect on health.
Pirbuterol is a beta-2 adrenergic bronchodilator. In vitro studies and in vivo pharmacologic studies have demonstrated that pirbuterol has a preferential effect on beta-2 Adrenergic receptors compared with isoproterenol. While it is recognized that beta-2 adrenergic receptors are the predominant receptors in bronchial smooth muscle, data indicate that there is a population of beta-2 receptors in the human heart, existing in a concentration between 10-50%. The precise function of these receptors has not been established. The pharmacologic effects of beta adrenergic agonist drugs, including pirbuterol, are at least in proof attributable to stimulation through beta adrenergic receptors of intracellular adenyl cyclase, the enzyme which catalyzes the conversion of adenosine triphosphate (AlP) to cyclic-3â€  ,5â€ -adenosine monophosphate (c-AMP). Increased c-AMP levels are associated with relaxation of bronchial smooth muscle and inhibition of release of mediators of immediate hypersensitivity from cells, especially from mast cells.
Tuftsin (L-threonyl-L-lysyl-L-prolyl-L-arginine) is a peptide related primarily to the immune system function. Tuftsin is a tetrapeptide (Thr-Lys-Pro-Arg) produced by enzymatic cleavage of the Fc-domain of the heavy chain of immunoglobulin G. It is produced primarily in the spleen. Its biological activity is related primarily to the immune system function. Tuftsin binds to specific receptors on the surface of macrophages and polymorphonuclear leukocytes, stimulating their migration, phagocytic, bactericidal, and tumoricidal activity. It also influences antibody formation. Tuftsin deficiency, either hereditary or following splenectomy, results in increased susceptibility to certain infections. Tuftsin has been chemically synthesized and it is considered for use in immunotherapy.
3',4'-Dihydroxyacetophenone is found in coffee and coffee products. 3',4'-Dihydroxyacetophenone is extracted from coffee residues. Potential component of FEMA 3662. 3',4'-Dihydroxyacetophenone is a mixture of dihydroxyacetophenone isomers is used in food flavourin
Melizame is a sweetene
5'-Hydroxypiroxicam is only found in individuals that have used or taken Piroxicam. 5'-Hydroxypiroxicam is a metabolite of Piroxicam. 5'-hydroxypiroxicam belongs to the family of Benzothiazines. These are organic compounds containing a benzene fused to a thiazine ring (a six-member ring with four carbon atoms, one nitrogen atom and one sulfur atom).
Diacetoxyscirpenol is a constituent of Fusarium species Mycotoxin
5-Hydroxykynurenamine is an intermediate in the tryptophan metabolic pathway [Kegg: C05638]. It is generated from 5-hydroxykynurenine via the enzyme DOPA decarboxylase.
7,8-Dehydroastaxanthianthin is found in crustaceans. 7,8-Dehydroastaxanthianthin is found in lobster eggs.
Thiabendazole is active against a variety of nematodes and is the drug of choice for strongyloidiasis. It has CNS side effects and hepatototoxic potential. (From Smith and Reynard, Textbook of Pharmacology, 1992, p919)The precise mode of action of thiabendazole on the parasite is unknown, but it most likely inhibits the helminth-specific enzyme fumarate reductase. Thiabendazole is also used as a postharvest treatment for bananas, plantains and oranges. Registered in Canada for control of silver scurf in stored potatoes Thiabendazole is a fungicide and parasiticide. Thiabendazole is also a chelating agent, which means that it is used medicinally to bind metals in cases of metal poisoning, such as lead poisoning, mercury poisoning or antimony poisoning. Thiabendazole is vermicidal and/or vermifugal against <i>Ascaris lumbricoides</i> ("common roundworm"), <i>Strongyloides stercoralis</i> (threadworm), <i>Necator americanus</i>, <i>Ancylostoma duodenale</i> (hookworm), <i>Trichuris trichiura</i> (whipworm), <i>Ancylostoma braziliense</i> (dog and cat hookworm), <i>Toxocara canis</i>, <i>Toxocara cati</i> (ascarids), and <i>Enterobius vermicularis</i> (pinworm). Thiabendazole also suppresses egg and/or larval production and may inhibit the subsequent development of those eggs or larvae which are passed in the feces
Imidaprilat, is the active metabolite of Imidapril. Imidapril is a prodrug used to treat hypertension, chronic congestive heart failure (CHF), acute myocardial infarction (AMI), and diabetic nephropathy (PMID: 17547476,18192036,12177688, 17094051). Imidapril belongs to a class of long-acting, non-sulfhydryl angiotensin-converting enzyme (ACE) inhibitors (PMID: 8851752, 12177688). Imidaprilat competitively binds and inhibits the catalytic activity of ACE, which results in a reduction of peripheral resistance and a reduction in systemic blood pressure (BP) (PMID: 17547476). Imidaprilat is only found in individuals that have used or taken imidapril.
4-hydroxytriazolam is a metabolite of triazolam. Triazolam (marketed in English-speaking countries under the brand names Apo-Triazo, Halcion, Hypam, and Trilam) is a benzodiazepine drug. It possesses pharmacological properties similar to that of other benzodiazepines, but it is generally only used as a sedative to treat severe insomnia. In addition to the hypnotic properties triazolam possesses, amnesic, anxiolytic, sedative, anticonvulsant and muscle relaxant properties are also present. (Wikipedia)
2-Phenylglycine, also known as a-amino-a-toluate or L-PHG amino 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). Outside of the human body, 2-Phenylglycine has been detected, but not quantified in cow milk. This could make 2-phenylglycine a potential biomarker for the consumption of these foods. 2-Phenylglycine is a metabolite described in normal human urine (PMID 14473597) and plasma (PMID 5888801).
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.
Tetrahydrofuran (THF) is a cyclic ether. It is a colorless, water-miscible organic liquid with low viscosity and a smell similar to diethyl ether. At low concentrations it has a faint, fruity aroma. It is one of the most polar ethers. THF is naturally present in coffee aroma, floured chickpeas, and cooked chicken. It is used in the manufacture of polymers as well as agricultural, pharmaceutical, and commodity chemicals. Because of its widespread use (industrially) and its presence in many foods, THF is a contaminant of exposure and can appear in human biofluids. THF oxidizes readily, which can lead to instability and result in cytotoxicity. In chemical synthesis applications, THF is often used for hydroborations used to synthesize primary alcohols. THF is frequently used as a solvent for Grignard reagents because of the oxygen atom's ability to coordinate to the magnesium ion component of the Grignard reagent (an organometallic chemical reaction involving alkyl- or aryl-magnesium halides). THF is often used in polymer science. For example, it can be used to dissolve rubber prior to determining its molecular mass using gel permeation chromatography. THF tends to form peroxides on storage in air. (PMID: 16999122, 12742700, 14619948). THF can be degraded by certain strains of Rhodococcus bacteria (PMID: 19230656).
Nutrient supplement used in bread fortification and infant formulas. Iron(III) diphosphate (Fe4(P2O7)3) is found in cereals and cereal products.
Neuromedin N is a neuropeptide derived from the same precursor polypeptide as neurotensin, and with similar but subtly distinct expression and effects.
PC(15:0/16:1(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(15:0/16:1(9Z)), in particular, consists of one chain of pentadecanoic acid at the C-1 position and one chain of palmitoleic acid at the C-2 position. The pentadecanoic acid moiety is derived from dairy products and milk fat, 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.
Xanthan is an emulsion stabilizing and gelling agent Since xanthan gum is sometimes produced by a bacterium that is fed corn to grow, some people allergic to corn may also react to it[citation needed]. Yellow Phrygian Husk is a common source of bacterium in which xanthan gum is created. However, some xanthan gum is not corn-derived. Xanthan gum is a common ingredient in fake blood recipes, and in Gunge. Xanthan gum is a polysaccharide used as a food additive and rheology modifier. It is produced by fermentation of glucose or sucrose by the Xanthomonas campestris bacterium
Doxepin hydrochloride is a dibenzoxepin-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, doxepin does not affect mood or arousal, but may cause sedation. In depressed individuals, doxepin exerts a positive effect on mood. TCAs are potent inhibitors of serotonin and norepinephrine reuptake. Tertiary amine TCAs, such as doxepin and amitriptyline, are more potent inhibitors of serotonin reuptake than secondary amine TCAs, such as nortriptyline and desipramine. TCAs also 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. Doxepin has less sedative and anticholinergic effects than amitriptyline. See toxicity section below for a complete listing of side effects. Doxepin may be used to treat depression and insomnia. Unlabeled indications include chronic and neuropathic pain, and anxiety. Doxepin may also be used as a second line agent to treat idiopathic urticaria.
N1-trans-Feruloylagmatine is found in cereals and cereal products. N1-trans-Feruloylagmatine is isolated from Triticum aestivum (wheat) exposed to low temps.
2-Methylguanosine 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: 17336316, 17154124, 3506820, 17044778, 17264127).
Ubiquinone-8, also known as coenzyme q8 or coq8, is a member of the class of compounds known as ubiquinones. Ubiquinones 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). Thus, ubiquinone-8 is considered to be a quinone lipid molecule. Ubiquinone-8 is practically insoluble (in water) and an extremely weak basic (essentially neutral) compound (based on its pKa). Ubiquinone-8 can be found in a number of food items such as kumquat, celery leaves, hazelnut, and jicama, which makes ubiquinone-8 a potential biomarker for the consumption of these food products. Ubiquinone-8 may be a unique E.coli metabolite.
Chlorobenzene is an aromatic organic compound with the chemical formula C6H5Cl. This colorless, flammable liquid is a common solvent and a widely used intermediate in the manufacture of other chemicals. Rhodococcus phenolicus is a bacterium species able to degrade chlorobenzene as sole carbon sources.
4-chlorocatechol belongs to the family of Catechols. These are compounds containing a 1,2-benzenediol moeity.
Butyrylcholine belongs to the class of organic compounds known as acyl cholines. These are acylated derivatives of choline. Butyrylcholine is a very hydrophobic molecule, practically insoluble (in water), and relatively neutral. Butyrylcholine is a synthetic compound and does not occur in the body naturally. It is used as a tool to distinguish between acetyl- and butyrylcholinesterase. Butyrylcholine is an acetylcholine-like molecule, with activation of some of the same receptors as acetylcholine. It is hydrolyzed by acetylcholinesterase and butyrylcholinesterase (also known as pseudocholinesterase), with butyrylcholinesterase being more efficient than acetylcholinesterase. Butyrylcholine is a nicotinic receptor agonist and mimics the action of acetylcholine (ACh) at both enteric and epithelial nicotinic acetylcholine receptors (nAChRs). Additionally, butyrylcholine is also able to stimulate muscarinic acetylcholine receptors (mAChRs) (PMID: 6481626, 27423041).
Ethoxyquin is an antioxidant used in animal feeds and for the preservation of colour in the production of chili powder, paprika and ground chilli. Ethoxyquin is formerly used as an agricultural pesticide/herbicide, now superseded. Also used as a post-harvest dip for apples and pears to prevent scald.
Imazamethabenz-methyl is a herbicide. Activity and selectivity are due to differential de-esterification to the active parent acid in target and crop species. Imazamethabenz-methyl is used on cereals and sunflowers, especially against wild oat
Asteltoxin is a mycotoxin of Aspergillus stellatus and Emericella varicolo
2',3'-Dihydro-phytomenadione is found in agave. 2',3'-Dihydro-phytomenadione is present in hydrogenated vegetable oils and a wide range of foods prepared from them. Readily absorbed by humans from dietary sources. About 15-fold less potent than natural vitamin K1 in chick blood coagulation assa
Echothiophate is only found in individuals that have used or taken this drug. It is a potent, long-acting irreversible cholinesterase inhibitor used as an ocular hypertensive in the treatment of glaucoma. Occasionally used for accomodative esotropia.Echothiophate Iodide is a long-acting cholinesterase inhibitor for topical use which enhances the effect of endogenously liberated acetylcholine in iris, ciliary muscle, and other parasympathetically innervated structures of the eye. Echothiophate iodide binds irreversibly to cholinesterase, and is long acting due to the slow rate of hydrolysis by cholinesterase. It causes miosis, increase in facility of outflow of aqueous humor, fall in intraocular pressure, and potentiation of accommodation.
Carbon disulfide is found in kohlrabi. Obsolete fumigant against insects in stored grain and potatoes.
Gluten exorphin A5 is a pentapeptide with the sequence Gly-Tyr-Tyr-Pro-Thr.  Gluten exorphins are a group of opioid peptides which are formed during digestion of the gluten protein. It has been hypothesized that people with autism and schizophrenia have abnormal leakage from the gut of these compounds, which then pass into the brain and disrupt brain function. This is partly the basis for the gluten-free, casein-free diet. The scientific evidence for this diet and its effects is still disputed.
Gluten exorphin A5 is a pentapeptide with the sequence Gly-Tyr-Tyr-Pro-Thr.  Gluten exorphins are a group of opioid peptides which are formed during digestion of the gluten protein. It has been hypothesized that people with autism and schizophrenia have abnormal leakage from the gut of these compounds, which then pass into the brain and disrupt brain function. This is partly the basis for the gluten-free, casein-free diet. The scientific evidence for this diet and its effects is still disputed.
Nb-Feruloyltryptamine is found in cereals and cereal products. Nb-Feruloyltryptamine is found in kernels of sweet corn (Zea mays).
As most NSAIDs, loxoprofen is a non-selective cyclooxygenase inhibitor, and works by reducing the synthesis of prostaglandins from arachidonic acid. Loxoprofen (INN) is a non-steroidal anti-inflammatory drug in the propionic acid derivatives group, which also includes ibuprofen and naproxen among others. It is marketed in Brazil, Mexico and Japan by Sankyo as its sodium salt, loxoprofen sodium, under the trade name Loxonin, Argentina as Oxeno and in India as Loxomac. It is available in these countries for oral administration, and a transdermal preparation was approved for sale in Japan on January 2006. Loxoprofen is a prodrug. It is quickly converted to its active trans-alcohol metabolite following oral administration, and reaches its peak plasma concentration within 30 to 50 minutes.
Celastrol, a plant-derived triterpene, has antioxidant and anti-inflammatory activity that may prevent neuronal degeneration in Alzheimer's disease (AD). In the brains of patients with AD signs of neuronal degeneration are accompanied by markers of microglial activation, inflammation, and oxidant damage. The presence of nitrotyrosine in the cell bodies of neurons in AD suggests that peroxynitrite contributes to the pathogenesis of the disease. In low nanomolar concentrations celastrol was found to suppress the production by human monocytes and macrophages of the pro-inflammatory cytokines TNF-alpha and IL-1beta. Celastrol also decreased the induced expression of class II MHC molecules by microglia. In macrophage lineage cells and endothelial cells celastrol decreased induced but not constitutive NO production. Celastrol suppresses adjuvant arthritis in the rat, demonstrating in vivo anti-inflammatory activity. Low doses of celastrol administered to rats significantly improved their performance in memory, learning and psychomotor activity tests. The potent antioxidant and anti-inflammatory activities of celastrol, and its effects on cognitive functions, suggest that the drug may be useful to treat neurodegenerative diseases accompanied by inflammation, such as AD. (PMID: 11513350).
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).
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.
4'-Methoxymucidin is found in mushrooms. 4'-Methoxymucidin is isolated from Oudemansiella mucida (porcelain fungus
4',7-Dihydroxy-2',5-dimethoxyisoflavone is found in pulses. 4',7-Dihydroxy-2',5-dimethoxyisoflavone is from Phaseolus coccineus (scarlet runner bean
5-hydroxypropafenone is a metabolite of propafenone. Propafenone is a class of anti-arrhythmic medication, which treats illnesses associated with rapid heart beats such as atrial and ventricular arrhythmias. (Wikipedia)
Mometasone is a medium-potency synthetic corticosteroid with antiinflammatory, antipruritic, and vasoconstrictive properties. Studies in asthmatic patients have demonstrated that mometasone provides a favorable ratio of topical to systemic activity due to its primary local effect along with the extensive hepatic metabolism and the lack of active metabolites. Though effective for the treatment of asthma, glucocorticoids do not affect asthma symptoms immediately. Maximum improvement in symptoms following inhaled administration of mometasone furoate may not be achieved for 1 to 2 weeks or longer after starting treatment. he antiinflammatory actions of corticosteroids are thought to involve phospholipase A2 inhibitory proteins, lipocortins, which control the biosynthesis of potent mediators of inflammation such as prostaglandins and leukotrienes.
Pentosan Polysulfate is only found in individuals that have used or taken this drug. It is a sulfated pentosyl polysaccharide with heparin-like properties. [PubChem]Pentosan polysulfate is a polymer of xylose hydrogen sulfate and contains two sulfate groups per carbohydrate monomer. It binds Fibroblast growth factors (FGFs) as well as other heparin-binding growth factors. It has been shown to interact also with the heparin-binding site of FGFR-1. It inhibits the growth of SW13 adrenocortical cells transfected with FGF-4 and tumorigenicity of MCF-7 breast carcinoma cells transfected with FGF-1 or FGF-4.
Benzothiazole, also known as BT or benzosulfonazole, belongs to the class of organic compounds known as benzothiazoles. These are organic compounds containing a benzene fused to a thiazole ring (a five-membered ring with four carbon atoms, one nitrogen atom and one sulfur atom). This ring is a potential component in nonlinear optics (NLO). The nine atoms of the bicycle and the attached substituents are coplanar. Although the parent compound, benzothiazole is not widely used, many of its derivatives are found in commercial products or in nature. Benzothiazole is a coffee, cooked, and gasoline tasting compound. benzothiazole is found, on average, in the highest concentration in safflowers. benzothiazole has also been detected, but not quantified, in several different foods, such as common persimmons, fruits, guava, potato, and tea. This could make benzothiazole a potential biomarker for the consumption of these foods. Firefly luciferin can be considered a derivative of benzothiazole. The compound is used also used as an insecticide and food flavoring agent. Some drugs contain this group, examples being riluzole and pramipexole. It is colorless, slightly viscous liquid. It is a thermally stable electron-withdrawing moiety with numerous applications in dyes such as thioflavin. Benzothiazole is an aromatic heterocyclic compound with the chemical formula C7H5NS.
Amidosulfonic acid is a food contaminant arising from its use as an ingredient of paper and paperboard products used in packagin
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.
5-Fluorouridine 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)
Anibiotic approved as a feed additive for broiler chickens in the U
Flavouring ingredient, sequestrant
L-homoarginine, also known as N6-(aminoiminomethyl)-L-lysine or N6-amidino-L-lysine, 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. More specifically, L-homoarginine is a naturally occurring, non-proteinogenic, cationic amino acid. It is formed in the liver in a reaction catalyzed by L-arginine:glycine amidinotransferase (AGAT) when transferring the amidino group from arginine to lysine. It is an alternative substrate for nitric oxide (NO) synthase. L-homoarginine increases the availability of NO and thereby affects endothelial function. High homoarginine levels may exert positive actions that are relevant to cardiovascular health, including enhanced endothelial function, inhibition of platelet aggregation and stimulation of insulin secretion (PMID: 30866658). Recent studies have demonstrated that low serum homoarginine levels are a strong predictor of cardiovascular mortality (PMID: 24583919). L-homoarginine is a substrate of the human cationic amino acid CAT1 [solute carrier family 7 (SLC7A1)], CAT2A (SLC7A2A) or CAT2B (SLC7A2B) (PMID: 28684763). According to published human metabolomic data, L-homoarginine can be found primarily in blood, cerebrospinal fluid (CSF), and urine, as well as in human intestinal and testes tissues. Moreover, L-homoarginine has been found to be associated with liver cirrhosis and the genetic disorder, hyperargininemia. Homoarginine is an organ-specific uncompetitive inhibitor of human liver and bone alkaline phosphohydrolase (PMID: 5063678).
Penicillamine is only found in individuals that have used or taken this drug. It is the most characteristic degradation product of the penicillin antibiotics. It is used as an antirheumatic and as a chelating agent in Wilson's disease. [PubChem]Penicillamine is a chelating agent recommended for the removal of excess copper in patients with Wilson's disease. From in vitro studies which indicate that one atom of copper combines with two molecules of penicillamine. Penicillamine also reduces excess cystine excretion in cystinuria. This is done, at least in part, by disulfide interchange between penicillamine and cystine, resulting in formation of penicillamine-cysteine disulfide, a substance that is much more soluble than cystine and is excreted readily. Penicillamine interferes with the formation of cross-links between tropocollagen molecules and cleaves them when newly formed. The mechanism of action of penicillamine in rheumatoid arthritis is unknown although it appears to suppress disease activity. Unlike cytotoxic immunosuppressants, penicillamine markedly lowers IgM rheumatoid factor but produces no significant depression in absolute levels of serum immunoglobulins. Also unlike cytotoxic immunosuppressants which act on both, penicillamine in vitro depresses T-cell activity but not B-cell activity.
Dietary supplement, nutrient
Lysylglutamic acid is a dipeptide composed of lysine and glutamic acid. 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-Butoxyethanol is used in food processing as a processing aid, sanitizer, solvent, etc 2-Butoxyethanol is an organic solvent with the formula C6H14O2. It is a colorless liquid with a sweet, ether-like odour. It is a butyl ether of ethylene glycol, but should not be confused with it. The main use of 2-butoxyethanol is as a solvent in paints and surface coatings, followed by cleaning products and inks. Other products which contain 2-butoxyethanol include acrylic resin formulations, asphalt release agents, firefighting foam, leather protectors, oil spill dispersants, bowling pin and lane degreaser, and photographic strip solutions. 2-Butoxyethanol is a primary ingredient of various whiteboard cleaners, liquid soaps, cosmetics, dry cleaning solutions, lacquers, varnishes, herbicides, and latex paints. It also seems to be excellent at killing most insects and arachnids
Cyclohexane is found in kohlrabi. Diluent in colour additive mixtures for food us
2-[(Methylthio)methyl]-2-butenal is found in coffee and coffee products. 2-[(Methylthio)methyl]-2-butenal is a flavour component of potato crisps and other snack foods, krill seasoning, roasted coffee and yeast extract
Detoxification of cyclophosphamide is effected, in part, by hepatic class 1 aldehyde dehydrogenase (ALDH-1)-catalyzed oxidation of aldophosphamide, a pivotal aldehyde intermediate, to the nontoxic metabolite, carboxyphosphamide. Detoxification of aldophosphamide may also be effected by enzymes, viz. Thus, NAD-linked oxidation and NADPH-linked reduction of aldophosphamide catalyzed by relevant erythrocyte enzymes were quantified. (PMID: 9394035) It has already been demonstrated that horse liver alcohol dehydrogenase catalyzes the reduction of aldophosphamide to alcophosphamide. (PMID: 8216347)
Phosphothreonine is a phosphoamino acid. It is the phosphorylated ester of threonine. There are three amino acids that are typically phosphorylated in eukaryotes: serine, threonine, and tyrosine. Threonine residues in endogenous proteins undergo phosphorylation through the action of a threonine kinase. Small amounts of free phosphothreonine can be detected in urine [PMID: 7693088].
D-Pipecolic acid is a normal human metabolite found in human biofluids. Normal adults excrete pipecolic acid primarily as the D-enantiomer even though it is present in the blood stream mainly as the L-enantiomer. It is believed that D-pipecolic acid originates from the metabolism of intestinal bacteria and from dietary sources. High levels of D-pipecolic acid are not found in plasma, but they are increased in urine of patients with chronic liver disease (PMID: 6501504, 6490790, 11719476, 8398594).
Cyclopentadiene belongs to the class of organic compounds known as cycloalkenes. These are compounds containing a non-aromatic closed ring of carbon atoms in which at least 2 atoms are connected by a double bond.
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.
Arsenobetaine is found in crustaceans. Arsenobetaine is found in algae, lobsters, sharks, etc. Arsenobetaine is an organoarsenic compound that is the main source of arsenic found in fish. It is the arsenic analogue of trimethylglycine, commonly known as betaine. The biochemistry and its biosynthesis are similar to the biosynthesis of choline and betaine. The; Besides several other arsenic compounds, such as dimethylarsine and trimethylarsine, arsenobetaine is a common substance in the marine biological systems for arsenic detoxification.
Arsenocholine is found in crustaceans. Claimed isolation from marine crustacea (prawns
18-Hydroxycortisol is a derivative of cortIsolated It may be synthesized by zona fasciculata 11-beta hydroxylase in normal human adrenal cortex. (PMID 15356073; 1751390) Overproduction of 18-hydroxycortisol is an aid in the detection of Glucocorticoid-remediable aldosteronism which is an inherited form of mineralocorticoid excess associated with moderate overproduction of aldosterone, in which biochemical and clinical remission is dramatically induced by small amounts of glucocorticoids.(PMID: 1879399).
Glycogen is a highly-branched polymer of about 30,000 glucose residues. The simplest structure of glycogen is made up of four units of glucose with an approximate molecular weight of 666 daltons. However, large molecules of glycogen can reach molecular weights in the order of 5 million Da. Most of the glucose units are linked together by alpha-1,4 glycosidic bonds, and approximately 1 in 12 glucose residues also form a 1,6 glycosidic bond with a second glucose, resulting in the creation of a branch. Glycogen only has one reducing end and a large number of non-reducing ends with a free hydroxyl group at carbon 4. The glycogen granules contain both glycogen and the enzymes of glycogen synthesis (glycogenesis) and degradation (glycogenolysis). The enzymes are nested between the outer branches of the glycogen molecules and act on the non-reducing ends. Therefore, the many non-reducing end-branches of glycogen facilitate its rapid synthesis and breakdown. In hypoglycemia caused by excessive insulin, liver glycogen levels are high, but the high insulin level prevents the necessary glycogenolysis to take place to maintain normal blood sugar levels. Glucagon is a common treatment for this type of hypoglycemia. Glycogen is a polysaccharide that is the principal storage form of glucose (Glc) in animal cells. Glycogen is found in the form of granules in the cytosol in many cell types. Hepatocytes (liver cells) have the highest concentration of it - up to 8% of the fresh weight in well fed state, or 100 to 120 g in an adult - giving liver a distinctive, 'starchy taste'. In the muscles, glycogen is found in a much lower concentration (1% of the muscle mass), but the total amount exceeds that in liver. Small amounts of glycogen are found in the kidneys, and even smaller amounts in certain glial cells in the brain and white blood cells.
Piperolein B is found in herbs and spices. Piperolein B is a minor constituent of Piper nigrum (black pepper
all-trans-Retinoic acid is an isomer of retinoic acid, the oxidized form of vitamin A. Retinoic acid functions in determining position along embryonic anterior/posterior axis in chordates. It acts through Hox genes, which ultimately controls anterior/posterior patterning in early developmental stages (PMID:17495912). It is an important regulator of gene expression during growth and development, and in neoplasms. As a drug, all-trans-retinoic acid is known as tretinoin. Tretinoin is derived from maternal vitamin A and is essential for normal growth and embryonic development. An excess of tretinoin can be teratogenic. Tretinoin is used in the treatment of psoriasis, acne vulgaris, and several other skin diseases. It has also been approved for use in promyelocytic leukemia (leukemia, promyelocytic, acute).
Demecarium bromid is an indirect-acting parasympathomimetic agent that is used to treat glaucoma. It is a cholinesterase inhibitor or an anticholinesterase. Cholinesterase inhibitors prolong the effect of acetylcholine, which is released at the neuroeffector junction of parasympathetic postganglion nerves, by inactivating the cholinesterases that break it down. Demecarium inactivates both pseudocholinesterase and acetylcholinesterase. In the eye, this causes constriction of the iris sphincter muscle (causing miosis) and the ciliary muscle. The outflow of the aqueous humor is facilitated, which leads to a reduction in intraocular pressure.
17-alpha-ethinyl estradiol is a metabolite of mestranol. Mestranol is the 3-methyl ether of ethinylestradiol. It was the estrogen used in many of the first oral contraceptives. It is a biologically inactive prodrug of ethinylestradiol to which it is demethylated in the liver with a conversion efficiency of 70% (50 µg of mestranol is pharmacokinetically bioequivalent to 35 µg of ethinylestradiol). (Wikipedia)
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).
2,3-Dihydroxyvaleric acid (DHVA) belongs to the class of organic compounds known as hydroxy fatty acids. These are fatty acids in which the chain bears a hydroxyl group. This compound has been detected in extracts from the purple carrot (https://doi.org/10.3390/app10238493). It is likely a hydroxylation derivative of the more common 2-hydroxyvaleric acid (an algal metabolite derived from a valeric acid) or 3-hydroxyvaleric acid (a 5-carbon ketone body made from odd carbon fatty acids in the liver). Very little is known about the origin of this particular hydroxy fatty acid.
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.
Bleaching agent for flou
Cyclopentolate is only found in individuals that have used or taken this drug. It is a parasympatholytic anticholinergic used solely to obtain mydriasis or cycloplegia. [PubChem]By blocking muscarinic receptors, cyclopentolate produces dilatation of the pupil (mydriasis) and prevents the eye from accommodating for near vision (cycloplegia).
(±)-2-Methylhexanoic acid is a flavouring ingredien
Kaempferol, also known as rhamnolutein or c.i. 75640, belongs to the class of organic compounds known as flavonols. Flavonols are compounds that contain a flavone (2-phenyl-1-benzopyran-4-one) backbone carrying a hydroxyl group at the 3-position. Thus, kaempferol is considered to be a flavonoid molecule. A tetrahydroxyflavone in which the four hydroxy groups are located at positions 3, 5, 7 and 4'. Kaempferol is a very hydrophobic molecule, practically insoluble in water, and relatively neutral. Kaempferol exists in all eukaryotes, ranging from yeast to humans. Kaempferol is a bitter tasting compound. Kaempferol is found, on average, in the highest concentration within a few different foods, such as saffrons, capers, and cumins and in a lower concentration in lovages, endives, and cloves. Kaempferol has also been detected, but not quantified, in several different foods, such as shallots, pine nuts, feijoa, kombus, and chicory leaves. This could make kaempferol a potential biomarker for the consumption of these foods. Kaempferol is a potentially toxic compound.
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).
(13E)-11a-Hydroxy-9,15-dioxoprost-13-enoic acid is a substrate for Carbonyl reductase 1.Prostaglandins 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.
Gb3Cer, also known as GB3 Globotriaosylceramide or CD77 Antigen, is classified as a member of the Glycosyl-N-acylsphingosines. Glycosyl-N-acylsphingosines are compounds containing a sphingosine linked to a simple glucosyl moiety. Gb3Cer is considered to be practically insoluble (in water) and acidic
Sorgoleone 358 is found in cereals and cereal products. Sorgoleone 358 is a constituent of the etiolated seedlings of Sorghum bicolor (sorghum).
Methyl (9Z)-8'-oxo-6,8'-diapo-6-carotenoate is a constituent of Bixa orellana (annatto)
Bradykinin hydroxyproline is a bradykinin analog where the third amino acid, proline, is replaced with hydroxyproline. Bradykinin is a vasoactive kinin that is liberated from its substrate kininogen by the action of kallikrein, and is known to be involved in a wide range of biologic processes. It may play an important role in blood pressure regulation and the maintenance of normal blood flow. Moreover, in various pathologic states of the cardiovascular system, it appears to provide protective actions against ischemic injury, ventricular hypertrophy, congestive heart failure, and thrombosis. Bradykinin is a potent vasodilator that acts through endothelial B2 kinin receptors to stimulate the release of nitric oxide and endothelium-derived hyperpolarizing factor. Bradykinin deficiency states may play a role in some forms of hypertension, and a relative deficiency in bradykinin may be a contributing factor to worsening heart failure. Experimental studies revealed that mice lacking the B2 receptor gene were more likely to develop hypertension, cardiac hypertrophy, and myocardial damage. Kinins exert several biologic actions. They are involved in nociception, inflammation, capillary permeability, reactive hyperemia, and stimulation of cellular glucose uptake. Bradykinin is a polypeptide that circulates in the plasma in very low concentrations in comparison with the amount of bradykinin found in various body tissues. Kininogens (alpha-2 globulins) are synthesized in the liver and circulate at high concentrations in the plasma. There are two kininogenases that convert kininogens into bradykinin: plasma kallikrein, also known as Fletcher factor, and glandular kallikrein, also known as tissue kallikrein (PMID: 11975815).
Acetylisoniazid belongs to the family of Pyridinecarboxamides. These are compounds containing a pyridine ring bearing a carboxamide.
Kynuramines are endogenously occurring diamines derived from tryptophan.
m-Chlorobenzoic acid is a metabolic byproduct of the drug bupropion. Bupropion is sold as Wellbutrin, or Zyban and is an atypical antidepressant that acts as a norepinephrine and dopamine reuptake inhibitor, and nicotinic antagonist. In 2007 it was the fourth-most prescribed antidepressant in the United States retail market, with 20.184 million retail prescriptions.
Amodiaquine is only found in individuals that have used or taken this drug. It is a 4-aminoquinoquinoline compound with anti-inflammatory properties. [PubChem]The mechanism of plasmodicidal action of amodiaquine is not completely certain. Like other quinoline derivatives, it is thought to inhibit heme polymerase activity. This results in accumulation of free heme, which is toxic to the parasites. The drug binds the free heme preventing the parasite from converting it to a form less toxic. This drug-heme complex is toxic and disrupts membrane function.
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]
Nirvanol is a metabolite of Mephenytoin. Nirvanol, also known as ethylphenylhydantoin, is a derivative of hydantoin with anticonvulsant properties. Its 5-ethyl-5-phenyl substitution pattern is similar to that of phenobarbital. It is useful in the treatment of chorea. (Wikipedia)
2,4,6-Tribromophenol, also known as 2,4,6-TBP or bromol, belongs to the class of organic compounds known as p-bromophenols. These are bromophenols carrying a iodine at the C4 position of the benzene ring. 2,4,6-Tribromophenol has been detected, but not quantified, in a few different foods, such as crustaceans, fishes, and mollusks. This could make 2,4,6-tribromophenol a potential biomarker for the consumption of these foods. A bromophenol that is phenol in which the hydrogens at positions 2, 4 and 6 have been replaced by bromines. 2,4,6-Tribromophenol is a potentially toxic compound.
Alpha-Hydroxy-tamoxifen-O-glucuronide 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)
Acidissiminol is found in beverages. Acidissiminol is an alkaloid from the fruit of Limonia acidissima (wood apple).
2-Pyrrolidinone is a lactam cyclization product of gamma-aminobutyric acid (GABA) (PMID 10332870). Vigabatrin (VGB, an antiepileptic drug) increases human brain gamma-aminobutyric acid (GABA) and the related metabolites, including 2-pyrrolidinone. Patients taking VGB are expected to have an increase of these metabolites (PMID 10403220, 10840398). 2-Pyrrolidone is an organic compound consisting of a five-membered lactam. It is a colorless liquid which is used in industrial settings as a high-boiling non-corrosive polar solvent for a wide variety of applications. It is miscible with a wide variety of other solvents including water, ethanol, diethyl ether, chloroform, benzene, ethyl acetate and carbon disulfide.
Phenylmethanethiol is a flavouring agent
Cuminol or Cuminyl alcohol, also known as p-cumin-7-ol or 4-Isopropylbenzyl alcohol, belongs to the class of organic compounds known as aromatic monoterpenoids. These are monoterpenoids containing at least one aromatic ring. 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 the 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. Cuminol is an extremely weak basic (essentially neutral) compound (based on its pKa). Cuminol is an alcohol derivative of p-Cymene. It exists as a clear, colorless liquid that is poorly soluble in water. Cuminol can be used as a food additive or as a cosmetic fragrance. It has a cumin, caraway or spicy, herbal aroma and a similar spicy, herbal or peppery taste. Cuminol is found naturally in a number of plants, spices and foods including cumin seed and cumin oils, caraway eucalyptus oils, thyme, sunflowers, tuermeric, guava fruit and other spices and essential oils. Cumin, a widely used spice, is known to have anti-diabetic properties and two of its phytochemicals: cuminol and cuminaldehyde appear to be among the most active components. Cuminol is a potent insulinotrophic molecule that can enhance insulin secretion by up to 4-fold (in rat islet cells) (PMID:23507295 ). It also exhibits strong beta-cell protective action (PMID:23507295 ).
Sertindole, a neuroleptic, is one of the newer antipsychotic medications available. Serdolect is developed by the Danish pharmaceutical company H. Lundbeck. Like the other atypical antipsychotics, it has activity at dopamine and serotonin receptors in the brain. It is used in the treatment of schizophrenia. It is classified chemically as a phenylindole derivative. It was first marketed in 1996 in several European countries before being withdrawn two years later because of numerous cardiac adverse effects. It has once again been approved and should soon be available on the French and Australian market.
Indole is an aromatic heterocyclic organic compound. It has a bicyclic structure, consisting of a six-membered benzene ring fused to a five-membered nitrogen-containing pyrrole ring. The participation of the nitrogen lone electron pair in the aromatic ring means that indole is not a base, and it does not behave like a simple amine. Indole is a microbial metabolite and it can be produced by bacteria as a degradation product of the amino acid tryptophan. It occurs naturally in human feces and has an intense fecal smell. At very low concentrations, however, indole has a flowery smell and is a constituent of many flower scents (such as orange blossoms) and perfumes. As a volatile organic compound, indole has been identified as a fecal biomarker of Clostridium difficile infection (PMID: 30986230). Natural jasmine oil, used in the perfume industry, contains around 2.5% of indole. Indole also occurs in coal tar. Indole has been found to be produced in a number of bacterial genera including Alcaligenes, Aspergillus, Escherichia, and Pseudomonas (PMID: 23194589, 2310183, 9680309). Indole plays a role in bacterial biofilm formation, bacterial motility, bacterial virulence, plasmid stability, and antibiotic resistance. It also functions as an intercellular signalling molecule (PMID: 26115989). Recently, it was determined that the bacterial membrane-bound histidine sensor kinase (HK) known as CpxA acts as a bacterial indole sensor to facilitate signalling (PMID: 31164470). It has been found that decreased indole concentrations in the gut promote bacterial pathogenesis, while increased levels of indole in the gut decrease bacterial virulence gene expression (PMID: 31164470). As a result, enteric pathogens sense a gradient of indole concentrations in the gut to migrate to different niches and successfully establish an infection.
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.
Isovaleric acid, is a natural fatty acid found in a wide variety of plants and essential oils. Isovaleric acid is clear colorless liquid that is sparingly soluble in water, but well soluble in most common organic solvents. It has been suggested that isovaleric acid from pilot whales, a species frequently consumed in the Faroe Islands, may be the unusual dietary factor in prolonged gestation in the population of the Faroe Islands. Previous studies suggested that was due to the high intake of n-3 polyunsaturated fatty acids has been, but fatty acid data for eicosapentaenoic acid (EPA) and docosahexanoic acid (DHA) in blood lipids of Faroese and Norwegians was reviewed in terms of the type of fish eaten (mostly lean white fish with DHA much greater than EPA); the popular lean fish, thus, probably provides too little EPA to produce a marked effect on human biochemistry (PMID 2646392). Isovaleric acid is found to be associated with isovaleric acidemia, which is an inborn error of metabolism.
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.
D-myo-inositol (1,3,4)-trisphosphate, also known as ins(1,3,4)p3 or inositol 1,3,4-trisphosphoric acid, is a member of the class of compounds known as inositol phosphates. Inositol phosphates are compounds containing a phosphate group attached to an inositol (or cyclohexanehexol) moiety. D-myo-inositol (1,3,4)-trisphosphate is soluble (in water) and an extremely strong acidic compound (based on its pKa). D-myo-inositol (1,3,4)-trisphosphate can be found in a number of food items such as vanilla, hyacinth bean, japanese pumpkin, and green bean, which makes D-myo-inositol (1,3,4)-trisphosphate a potential biomarker for the consumption of these food products.
Ropinirole is a non-ergoline dopamine agonist, manufactured by GlaxoSmithKline. It is used in the treatment of Parkinson's disease, and is also one of two medications in the United States with an FDA-approved indication for the treatment of restless legs syndrome (the other being Pramipexole). [Wikipedia]
Bethanidine is only found in individuals that have used or taken this drug. It is a guanidinium antihypertensive agent that acts by blocking adrenergic transmission.Bethanidine, a guanidine derivative, is a peripherally acting antiadrenergic agent which primarily acts as an alpha2a adrenergic agonist. Bethanidine effectively decreases blood pressure by suppressing renin secretion or interfering with function of the sympathetic nervous system.
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
Bisphenol A, commonly abbreviated as BPA, is an organic compound with two phenol functional groups. It is a difunctional building block of several important plastics and plastic additives. With an annual production of 2–3 million metric tonnes, it is an important monomer in the production of polycarbonate. It is a potential food contaminant arising from its use in reusable polycarbonate food containers such as water carboys, baby bottles and kitchen utensils
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]
(18R)-Hydroxyarachidonate is a substrate for CYP4F8 or leukotriene-B4 20-monooxygenase (EC 1.14.13.30). This enzyme hydroxylates arachdonic acid (20:4n-6) to (18R)-hydroxyarachidonate in the endoplasmic reticulum. This reaction is irreversible. CYP4F8 is a member of the cytochrome P450 superfamily of enzymes. The cytochrome P450 proteins are monooxygenases which catalyze many reactions involved in drug metabolism and synthesis of cholesterol, steroids and other lipids. This protein localizes to the endoplasmic reticulum and functions as a 19-hydroxylase of prostaglandins in seminal vesicles. In particular, CYP4F8 catalyzes the 2-hydroxylation of PGH1 and PGH2, which will lead to biosynthesis of the two main PGs of human seminal fluid, (19R)-hydroxy-PGE1 and (19R)-hydroxy-PGE2 (PMID: 10791960). 18-Hydroxyarachidonic acid is an intermediate in eicosanoid metabolism.
Methyl nicotinate is found in alcoholic beverages. Methyl nicotinate is a flavouring ingredient. Methyl nicotinate is present in guava fruit, papaya, strawberry, soursop (Annona muricata), beer, grape brandy, coffee, roasted filbert, roasted peanut and Bourbon vanill
Systemic agricultural insecticide, acaricide and nematocid
Tizanidine is a short-acting drug for the management of spasticity. Tizanidine is an agonist at a2-adrenergic receptor sites and presumably reduces spasticity by increasing presynaptic inhibition of motor neurons. In animal models, tizanidine has no direct effect on skeletal muscle fibers or the neuromuscular junction, and no major effect on monosynaptic spinal reflexes. The effects of tizanidine are greatest on polysynaptic pathways. The overall effect of these actions is thought to reduce facilitation of spinal motor neurons. Tizanidine has two major metabolites: (1) 5-chloro-4-(2-imidazolin-4-on-2-ylamino)-2,1,3-benzothiazdiazole and (2) 5-chloro-4-(2-imidazolin-4-on-2-ylamino)-2,1,3-benzothiadiazole (PMID: 9929503, 19961320).
Androstanediol is a metabolite of dihydrotestosterone, itself a metabolite of testosterone. Androstanediol is implicated in the regulation of gonadotropin secretion. As a metabolite of dihydroxytestosterone formed in the peripheral tissues, androstanediol and androstnediol-glucuronide can be used to estimate peripheral androgen activity. Androstanediol is a potential GABA (A) receptor-modulating neurosteroid with anticonvulsant properties and hence could act as a key neuromodulator in the central nervous system. It is considered that androstanediol has hedonic effects; therefore it is anticipated that androgens that are readily metabolized to androstanediol may have higher abuse potential than androgens that are not as easily metabolized to androstanediol. These results add to the growing literature indicating that athletes and non-athletes may be at considerable risk when they abuse androgens. (PMID: 11500254, 16040068, 11744084).
Germanium is not an essential element. Physiologically, it exists as an ion in the body. Its acute toxicity is low. Germanium-containing dietary supplements became popular in the 1970s in Japan and later in other countries, as elixirs for certain diseases (e.g., cancer and AIDS). However, at least 31 reported human cases linked prolonged intake of germanium products with renal failure and even death.
N-Acetyl-alpha-neuraminate is a sialic acid. Sialic acids are an important family of related 9-carbon sugars acids, present on the surface of many different cells and functioning in a wide range of different biological processes. They mediate a variety of cell-cell and cell-molecule interactions in eukaryotes and can be utilized by pathogens to evade the host immune response. N-acetylneuraminic acid is the most common sialic acid, and the predominant form present in humans. It can be found as a terminal sugar on a wide range of surface glycoconjugates. A number of bacteria that can colonize humans (such as E. coli) make use of N-acetylneuraminic acid as a nutrient source.
Plicamycin is only found in individuals that have used or taken this drug. It is an antineoplastic antibiotic produced by Streptomyces plicatus. It has been used in the treatment of testicular cancer, Paget's disease of bone, and, rarely, the management of hypercalcemia. The manufacturer discontinued plicamycin in 2000. Plicamycin is presumed to inhibit cellular and enzymic RNA synthesis by forming a complex with DNA. Plicamycin may also lower calcium serum levels by inhibiting the effect of parathyroid hormone upon osteoclasts or by blocking the hypercalcemic action of pharmacologic doses of vitamin D.
Glutamylmethionine is a dipeptide composed of glutamate and methionine, 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. Glutamylmethionine 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.
Arginylglutamine is a dipeptide composed of arginine and glutamine. 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.
Oleanolic acid 3-[glucosyl-(1->4)-xyloside] is found in pulses. Oleanolic acid 3-[glucosyl-(1->4)-xyloside] is a constituent of the stems of Pisum sativum (pea)
In vivo, 9-cis-retinal is formed through oxidation of 9-cis-retinol by cis-retinol dehydrogenase (cRDH). (PMID:15572038). The generation of retinoic acid from retinol is a two-step reaction, with the rate-limiting step being the oxidation of retinol into the intermediate retinaldehyde. Two classes of. unrelated enzymes have been implicated in the oxidation of retinol, the classical cytosolic medium chain alcohol dehydrogenases and recently identified microsomal members of the short chain alcohol dehydrogenase reductase (SDR) superfamily. Further oxidation of the retinaldehyde to the retinoic acid is believed to be catalyzed by several cytosolic aldehyde dehydrogenases. Retinoids are micronutrients required to maintain and promote health of vertebrates. They act physiologically by participating in the visual cycle, in regulating cell differentiation, in embryonic development (PMID:10893430), in maintaining normal reproduction, and in the immune response (PMID:8882153). In non-ocular tissues, the effects of retinoids within the body are mediated through retinoic acid receptors (RARs) and retinoid X receptors (RXRs), which act to regulate gene expression as ligand-dependent transcription factors. The naturally occurring ligands for these nuclear receptors are thought to be all-trans-retinoic acid for RARs and 9-cis-retinoic acid for RXRs (PMID:10322133). While many details of the molecular actions of the RARs and RXRs in regulating gene transcription are understood (PMID:10418975), tissue-specific synthetic pathway(s) of their ligands has not been adequately defined. Nevertheless, the therapeutic efficacy of retinoids, including 9-cis-retinoic acid, is well established in both tissue culture and animal models of breast cancer (PMID:8825126, PMID:12743994).
N-desisopropylpropranolol is a metabolite of propranolol. Propranolol is a sympatholytic non-selective beta blocker. Sympatholytics are used to treat hypertension, anxiety and panic. It was the first successful beta blocker developed. Propranolol is available in generic form as propranolol hydrochloride, as well as an AstraZeneca and Wyeth product under the brand names Inderal, Inderal LA, Avlocardyl, Deralin, Dociton, Inderalici, InnoPran XL, Sumial, Anaprilinum, Bedranol SR. (Wikipedia)
p-Hydroxyphenobarbital is a metabolite of Phenobarbital. Phenobarbital (INN) is a barbiturate and the most widely used anticonvulsant worldwide, and the oldest still commonly used. It also has sedative and hypnotic properties. (Wikipedia)
Polypropylene glycol (m w 1,200-3,000) is used as a food additive [EAFUS] ("EAFUS: Everything Added to Food in the United States. [http://www.eafus.com/]")
2-Ethoxyethanol is a diluent in colour additive mixtures for marking food. 2-Ethoxyethanol, also known by the trademark Cellosolve or ethyl cellosolve, is a solvent used widely in commercial and industrial applications. It is a clear, colorless, nearly odorless liquid that is miscible with water, ethanol, diethyl ether, acetone, and ethyl acetate. As with other glycol ethers, 2-ethoxyethanol has the useful property of being able to dissolve chemically diverse compounds. It will dissolve oils, resins, grease, waxes, nitrocellulose, and lacquers. This is an ideal property as a multi-purpose cleaner and therefore 2-ethoxyethanol is used in products such as varnish removers and degreasing solutions
Mitomycin is only found in individuals that have used or taken this drug. It is an antineoplastic antibiotic produced by Streptomyces caespitosus. It is one of the bi- or tri-functional alkylating agents causing cross-linking of DNA and inhibition of DNA synthesis. [PubChem]Mitomycin is activated in vivo to a bifunctional and trifunctional alkylating agent. Binding to DNA leads to cross-linking and inhibition of DNA synthesis and function. Mitomycin is cell cycle phase-nonspecific.
Glaucamine is an alkaloid from Papaver rhoeas (corn poppy
Drospirenone is a synthetic progestin that is an analog to spironolactone. It is found in a number of birth control formulations. Drospirenone differs from other synthetic progestins in that its pharmacological profile in preclinical studies shows it to be closer to the natural progesterone. As such it has anti-mineralocorticoid properties, counteracts the estrogen-stimulated activity of the renin-angiotensin-aldosterone system, and is not androgenic.
Nonoxynol-9 (N-9) is a typical surfactant used as a vaginal spermicide. Spermicides are locally acting non-hormonal contraceptives. When present in the vagina during intercourse, they immobilize/inactivate/damage and/or kill sperms without eliciting systemic effects. N-9 has been in use for more than 30 years as an over-the-counter (OTC) drug in creams, gels, foams and condom lubricants. It is the most commonly used spermicidal contraceptive in the UK and the USA. In several European countries, spermicides are no longer on the market.
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]
Homocystine is the oxidized form of homocysteine.  Homocystine is a dipeptide consisting of two homocysteine molecules joined by a disulfide bond. Homocysteine is a sulfur-containing amino acid that arises during methionine metabolism. Homocystine occurs only transiently before being reduced to homocysteine and converted to the harmless cystathionine via a vitamin B6-dependent enzyme. Homocystine and homocysteine-cysteine mixed disulfides account for >98% of total homocysteine in plasma from healthy individuals (PMID 11592966).  Homocystine has been shown to stereospecifically induce endothelial nitric oxide synthase-dependent lipid peroxidation in endothelial cells, thereby inducing a vascular cell type-specific oxidative stress. This vascular stress is associated with atherothrombotic cardiovascular disease (PMID: 14980706).  High levels of homocysteine (and homocysteine) can be found in individuals suffering from homocystinura due to cystathionine synthase deficiency (PMID: 4685596)
Cyprodinil is a fungicide
Cinolazepam is only found in individuals that have used or taken this drug. It is a benzodiazepine derivative. It possesses anxiolytic, anticonvulsant, sedative and skeletal muscle relaxant properties. Cinolazepam is not approved for sale in the United States or Canada.Cinolazepam 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.
Ethyl 4-methylphenoxyacetate is a flavouring ingredient.
Phenindione is only found in individuals that have used or taken this drug. It is an indandione that has been used as an anticoagulant. Phenindione has actions similar to warfarin, but it is now rarely employed because of its higher incidence of severe adverse effects. (From Martindale, The Extra Pharmacopoeia, 30th ed, p234)Phenindione inhibits vitamin K reductase, resulting in depletion of the reduced form of vitamin K (vitamin KH2). As vitamin K is a cofactor for the carboxylation of glutamate residues on the N-terminal regions of vitamin K-dependent proteins, this limits the gamma-carboxylation and subsequent activation of the vitamin K-dependent coagulant proteins. The synthesis of vitamin K-dependent coagulation factors II, VII, IX, and X and anticoagulant proteins C and S is inhibited. Depression of three of the four vitamin K-dependent coagulation factors (factors II, VII, and X) results in decreased prothrombin levels and a decrease in the amount of thrombin generated and bound to fibrin. This reduces the thrombogenicity of clots.
4-Oxoretinal is a predominant retinoids during morphogenesis in mouse skin in vivo. Topical 4-oxoretinal and 4-oxoretinol promoted significant epidermal hyperplasia and metaplasia in mouse tail. They induced a moderate response for epidermal inflammation, compared with retinal, whereas neither 4-oxoretinal nor 4-oxoretinol prevented menadione-induced epidermal lipid peroxidation, unlike retinal and retinol. As analyzed by quantitative PCR, 4-oxoretinal and 4-oxoretinol did not reproduce the significant increased expression of genes coding for keratin 4, amphiregulin, heparin-EGF and CYP26A1, that did induce retinal and retinol. However, both retinal and 4-oxoretinal significantly inhibited the lipopolysaccharide-induced maturation of human dendritic cells in vitro. As analyzed in vivo and in vitro, 4-oxoretinal and 4-oxoretinol were not converted into retinoic acid. We conclude that 4-oxoretinal and 4-oxoretinol exert a moderate direct retinoid-like activity in vivo, thus confirming previous in vitro studies in amphibians showing 4-oxometabolites of vitamin A as bioactive agents rather than inactive catabolites.
Bromodichloromethane, also known as dichlorobromomethane or monobromodichloromethane, is classified as a member of the trihalomethanes. Trihalomethanes are organic compounds in which exactly three of the four hydrogen atoms of methane (CH4) are replaced by halogen atoms. Bromodichloromethane is a colorless, nonflammable liquid. Small amounts are formed naturally by algae in the oceans. Some of it will dissolve in water, but it readily evaporates into air. Only small quantities of bromodichloromethane are produced in the United States. The small quantities that are produced are used in laboratories or to make other chemicals. However, most bromodichloromethane is formed as a by-product when chlorine is added to drinking water to kill bacteria. Bromodichloromethane has been formerly used as a flame retardant, and a solvent for fats and waxes and because of its high density for mineral separation. Now it is only used as a reagent or intermediate in organic chemistry. Bromodichloromethane can also occur in municipally-treated drinking water as a by-product of the chlorine disinfection process.
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.
Azlocillin is only found in individuals that have used or taken this drug. It is a semisynthetic ampicillin-derived acylureido penicillin.By binding to specific penicillin-binding proteins (PBPs) located inside the bacterial cell wall, azlocillin 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 azlocillin interferes with an autolysin inhibitor.
The major progestational steroid that is secreted primarily by the corpus luteum and the placenta. Progesterone acts on the uterus, the mammary glands and the brain. It is required in embryo implantation, pregnancy maintenance, and the development of mammary tissue for milk production. Progesterone, converted from pregnenolone, also serves as an intermediate in the biosynthesis of gonadal steroid hormones and adrenal corticosteroids. 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. 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 labor. In addition progesterone inhibits lactation during pregnancy. The fall in progesterone levels following delivery is one of the triggers for milk production. Progesterone is found to be associated with pregnene hydroxylation deficiency, which is an inborn error of metabolism.
2-Amino-6-methyldipyrido[1,2-a:3',2'-d]imidazole is a powerful mutagen presumed present in cooked food
Dehydrocyanaropicrin is found in globe artichoke. Dehydrocyanaropicrin is a constituent of Cynara scolymus (artichoke)
Lucidone A is found in mushrooms. Lucidone A is a constituent of Ganoderma lucidum (reishi)
Octanoyl-CoA is a substrate for Trifunctional enzyme beta subunit (mitochondrial), Acyl-coenzyme A oxidase 1 (peroxisomal), 3-ketoacyl-CoA thiolase (mitochondrial), 3-ketoacyl-CoA thiolase (peroxisomal), Nuclear receptor-binding factor 1, Acyl-CoA dehydrogenase (long-chain specific, mitochondrial), Acyl-coenzyme A oxidase 3 (peroxisomal), HPDHase, Acyl-CoA dehydrogenase (medium-chain specific, mitochondrial), Acyl-coenzyme A oxidase 2 (peroxisomal) and Peroxisomal carnitine O-octanoyltransferase.
Daunorubicin is only found in individuals that have used or taken this drug. It is a very toxic anthracycline aminoglycoside antineoplastic isolated from Streptomyces peucetius and others, used in treatment of leukemia and other neoplasms. [PubChem]Daunorubicin has antimitotic and cytotoxic activity through a number of proposed mechanisms of action: Daunorubicin forms complexes with DNA by intercalation between base pairs, and it inhibits topoisomerase II activity by stabilizing the DNA-topoisomerase II complex, preventing the religation portion of the ligation-religation reaction that topoisomerase II catalyzes.
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.
Altretamine is only found in individuals that have used or taken this drug. It is an alkylating agent proposed as an antineoplastic. It also acts as a chemosterilant for male houseflies and other insects. [PubChem]The precise mechanism by which altretamine exerts its cytotoxic effect is unknown although it is classified as an alkylating anti-neoplastic agent. Through this mechanism, the drug is metabolized into alkylating agents by N-demethylation. These alkylating species consequently damage tumor cells.
Clorazepate is only found in individuals that have used or taken this drug. It is a water-soluble benzodiazepine derivative effective in the treatment of anxiety. It has also muscle relaxant and anticonvulsant actions. [PubChem]Benzodiazepines bind nonspecifically to benzodiazepine receptors BNZ1, which mediates sleep, and BNZ2, which affects 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.
Lucidone A is found in mushrooms. Lucidone A is a constituent of Ganoderma lucidum (reishi)
N-Acryloylglycine 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. N-Acryloylglycine is an acylglycines found in normal human biofluids (PMID 7364920; 912020; 7438429).
Nicotinic acid, also known as niacin or vitamin B3, is a water-soluble vitamin whose derivatives such as NADH, NAD, NAD+, and NADP play essential roles in energy metabolism in the living cell and DNA repair. The designation vitamin B3 also includes the amide form, nicotinamide or niacinamide. Severe lack of niacin causes the deficiency disease pellagra, whereas a mild deficiency slows down the metabolism decreasing cold tolerance. The recommended daily allowance of niacin is 2-12 mg a day for children, 14 mg a day for women, 16 mg a day for men, and 18 mg a day for pregnant or breast-feeding women. It is found in various animal and plant tissues and has pellagra-curative, vasodilating, and antilipemic properties. The liver can synthesize niacin from the essential amino acid tryptophan, but the synthesis is extremely slow and requires vitamin B6; 60 mg of tryptophan are required to make one milligram of niacin. Bacteria in the gut may also perform the conversion but are inefficient.
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.
Pyridoxine, also known vitamin B6, is commonly found in food and is used as a dietary supplement. Pyridoxine is an essential nutrient, meaning the body cannot synthesize it, and it must be obtained from the diet. Sources in the diet include fruit, vegetables, and grain. Although pyridoxine and vitamin B6 are still frequently used as synonyms, especially by medical researchers, this practice is sometimes misleading (PMID: 2192605). Technically, pyridoxine is one of the compounds that can be called vitamin B6 or it is a member of the family of B6 vitamins. Healthy human blood levels of pyridoxine are 2.1 - 21.7 ng/mL. Pyridoxine is readily converted to pyridoxal phosphate which is a coenzyme for synthesis of amino acids, neurotransmitters (serotonin, norepinephrine), sphingolipids and aminolevulinic acid. Pyridoxine assists in the balancing of sodium and potassium as well as promoting red blood cell production. Therefore pyridoxine is required by the body to make amino acids, carbohydrates, and lipids. It is linked to cancer immunity and helps fight the formation of homocysteine. It has been suggested that pyridoxine might help children with learning difficulties, and may also prevent dandruff, eczema, and psoriasis. In addition, pyridoxine can help balance hormonal changes in women and aid in immune system. Lack of pyridoxine may cause anemia, nerve damage, seizures, skin problems, and sores in the mouth (Wikipedia). Deficiency of pyridoxine, though rare because of widespread distribution in foods, leads to the development of peripheral neuritis in adults and affects the central nervous system in children (DOSE - 3rd edition). As a supplement pyridoxine is used to treat and prevent pyridoxine deficiency, sideroblastic anaemia, pyridoxine-dependent epilepsy, certain metabolic disorders, problems from isoniazid, and certain types of mushroom poisoning. Pyridoxine in combination with doxylamine is used as a treatment for morning sickness in pregnant women.
Pyrimidine is a heterocyclic aromatic organic compound similar to benzene and pyridine, containing two nitrogen atoms at positions 1 and 3 of the six-member ring. Pyrimidines are heterocyclic, six-membered, nitrogen-containing carbon ring structures, with uracil, cytosine and thymine being the basal structures of ribose-containing nucleosides (uridine, cytidine and thymidine respectively), or deoxyribose-containing deoxynucleosides, and their corresponding ribonucleotides or deoxyribonucleotides. Pyrimidines serve essential functions in human metabolism as ribonucleotide bases in RNA (uracil and cytosine), and as deoxyribonucleotide bases in DNA (cytosine and thymine), and are linked by phosphodiester bridges to purine nucleotides in double-stranded DNA, in both the nucleus and the mitochondria. Pyrimidine activated sugars are also involved in polysaccharide and phospholipid synthesis, glucuronidation in detoxification processes, glycosylation of proteins and lipids and in the recently identified novel endothelium-derived vasoactive dinucleotides. Pyrimidines are synthesized de novo from simple precursors. Synthesis occurs in six steps, with cellular compartmentalization of specific steps in the cytosol or mitochondria, enabling changes in metabolic rate with need. Pyrimidine synthesis differs from purine synthesis, in that the single pyrimidine ring is assembled first and is then linked to ribose phosphate to form UMP. The enzymes that catalyse UMP synthesis, CAD [carbamoylphosphate synthetase II (CPSII), aspartate transcarbamoylase (ATCasea) and dihydroorotase (DHOase)], dihydroorotate dehydrogenase (DHODH) and uridine monophosphate synthase (UMPS), are encoded by only three genes - CAD, DHODH and UMPS (chromosomal locations 2p21, 16q22 and 3q13, respectively). (PMID:16098809).
Succinyladenosine (SAdo) is one of the dephosphorylated enzyme substrate that accumulates in body fluids of patients with adenylosuccinate lyase (ADSL) deficiency, the other being 5-amino-4-imidazole-N-succinocarboxamide riboside (SAICAr). ADSL is an inherited metabolic disease characterized by various degrees of psychomotor retardation (PMID 15902552). The severity of the clinical presentation correlates with a low S-Ado/SAICAr ratio in body fluids (PMID: 15571235). Normally Succinyladenosine is not found in blood or CSF but may be detected in trace amounts in urine (OMIM 103050). Succinyladenosine is also found to be associated with fumarase deficiency, another inborn error of metabolism.
Tyrosyl-Aspartate is a dipeptide composed of tyrosine and aspartate. 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.
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.
Vinylacetylglycine 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. Vinylacetylglycine is a human metabolite that had been identified in a GC/MS urine screen. Increased amounts of this metabolite in the urine has been linked to a metabolomic disorder termed Isovaleric acidemia. (Gas-Chromatographic Method of Analysis for Urinary Organic Acids. I. Retention indices of 155 metaboically Important Compounds; Kay Tanaka, David G. Hine, Agnes West-Dull, and Theodore B. Lynn.).
Xanthurenic acid, also known as xanthurenate or 8-hydroxykynurenic acid, is a member of the class of compounds known as quinoline carboxylic acids. Quinoline carboxylic acids are quinolines in which the quinoline ring system is substituted by a carboxyl group at one or more positions. Xanthurenic acid is slightly soluble (in water). Xanthurenic acid can be found primarily in blood, feces, and urine, as well as in human epidermis tissue. Within the cell, xanthurenic acid is primarily located in the membrane. Xanthurenic acid exists in all eukaryotes, ranging from yeast to humans. In humans, xanthurenic acid is involved in the tryptophan metabolism. Moreover, xanthurenic acid is found to be associated with citrullinemia type I, which is an inborn error of metabolism. Xanthurenic acid is a metabolite from tryptophan catabolism. It is a substrate of the enzyme methyltransferases (EC 2.1.1.-) in pathway tryptophan metabolism (KEGG).
4,6-Dihydroxyquinoline is the product of the conversion of 5-hydroxykynurenamine by the enzyme monoamine oxidase, both metabolites from the 5-hydroxytryptophan metabolism. (PMIDs 7160021, 312499).
5-L-Glutamyl-taurine is an intermediate in Taurine and hypotaurine metabolism. 5-L-Glutamyl-taurine is produced from Taurine via the enzyme gamma-glutamyltranspeptidase (EC 2.3.2.2).
3-Indole carboxylic acid glucuronide is a natural human metabolites of Indole-3-carboxylic acid. Indole-3-carboxylic acid is a normal urinary indolic tryptophan metabolite (PMID 4844607) and has been found elevated in patients with liver diseases (PMID 13905029). 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.
L-homocysteic acid is a homocysteic acid with L-configuration. It has a role as a NMDA receptor agonist. It is an enantiomer of a D-homocysteic acid. L-Homocysteic acid is a sulfur-containing glutamic acid analog and a potent NMDA receptor agonist. It is related to homocysteine, a by-product of methionine metabolism. It 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.
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.
4-Methoxycinnamic acid, also known as para-methoxycinnamate or O-methyl-p-coumarate, belongs to the class of organic compounds known as cinnamic acids. These are organic aromatic compounds containing a benzene and a carboxylic acid group forming 3-phenylprop-2-enoic acid. Outside of the human body, 4-Methoxycinnamic acid is found, on average, in the highest concentration within turmerics. 4-Methoxycinnamic acid has also been detected, but not quantified in cow milk and wild celeries. This could make 4-methoxycinnamic acid a potential biomarker for the consumption of these foods.
Homoagmatine is found in pulses. Homoagmatine is a constituent of Lathyrus sativus (chickling pea)
Valylcysteine is a dipeptide composed of valine and cysteine. 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.
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
3-Oxohexanoic acid is fatty acid formed by the action of Fatty acid synthases from acetyl-CoA and malonyl-CoA precursors. This fatty acid is involved in fatty acid biosynthesis. Specifically, it is the product of reaction between malonic acid and three enznymes; beta-ketoacyl -acyl-carrier- protein synthase, fatty-acid Synthase, and beta- ketoacyl -acyl-carrier- protein synthase II.
Homoserine is a more reactive variant of the amino acid serine. In this variant, the hydroxyl side chain contains an additional CH2 group which brings the hydroxyl group closer to its own carboxyl group, allowing it to chemically react to form a five-membered ring. This occurs at the point that amino acids normally join to their neighbours in a peptide bond. Homoserine is therefore unsuitable for forming proteins and has been eliminated from the repertoire of amino acids used by living things. Homoserine is the final product on the C-terminal end of the N-terminal fragment following a cyanogen bromide cleavage. (wikipedia). Homoserine is also a microbial metabolite.
Tyrosyl-Threonine is a dipeptide composed of tyrosine and threonine. 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.
Histidyltyrosine is a dipeptide composed of histidine and tyrosine. 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-coumaric acid, also known as o-coumaric acid, is a monohydroxycinnamic acid in which the hydroxy substituent is located at C-2 of the phenyl ring. It has a role as a plant metabolite. It is a conjugate acid of a 2-coumarate. It is a hydroxycinnamic acid, an organic compound that is a hydroxy derivative of cinnamic acid. There are three isomers of coumaric acids: o-coumaric acid, m-coumaric acid, and p-coumaric acid, that differ by the position of the hydroxy substitution of the phenyl group. 2-Hydroxycinnamic acid belongs to the class of organic compounds known as hydroxycinnamic acids. Hydroxycinnamic acids are compounds containing an cinnamic acid where the benzene ring is hydroxylated. 2-Hydroxycinnamic acid exists in all living organisms, ranging from bacteria to humans. 2-Hydroxycinnamic acid has been found in a few different foods, such as corns, hard wheats, and olives and in a lower concentration in pomegranates, american cranberries, and peanuts. 2-Hydroxycinnamic acid has also been detected, but not quantified in several different foods, such as carrots, soy beans, ryes, rye bread, and turmerics.
Canavanine reacts with water to produce L-canaline and urea. The reaction is catalyzed by arginase. L-canaline reacts with carbamoyl-phosphate to produce O-ureidohomoserine and phosphate. The reaction is catalyzed by ornithine carbamoyltransferase.
Indoxyl, also known as 1H-indol-3-ol, belongs to the class of organic compounds known as hydroxyindoles. These are organic compounds containing an indole moiety that carries a hydroxyl group. Indoxyl is isomeric with oxindol and is obtained as an oily liquid. Indoxyl exists in all living organisms, ranging from bacteria to humans. Indoxyl is obtained from indican, which is a glycoside. Obermayer's reagent is a dilute solution FeCl3 in hydrochloric acid. The hydrolysis of indican yields β-D-glucose and indoxyl. Indigo dye is a product of the reaction of indoxyl by a mild oxidizing agent such as atmospheric oxygen. In chemistry, indoxyl is a nitrogenous substance with the chemical formula: C8H7NO. Indoxyl can be found in urine and is titrated with Obermayer's reagent.
1-Methylxanthine is one of the major metabolites of caffeine in humans. The oxidation of 1-methylxanthine to 1-methyluric acid occurs so rapidly that the parent compound could not be detected in plasma, and only low concentrations could be detected in the brain (PMID: 28863020).
12-Methyltridecanoic acid is found in fishes. 12-Methyltridecanoic acid occurs in Baltic salmon and sperm whal
Indole is an aromatic heterocyclic organic compound. It has a bicyclic structure, consisting of a six-membered benzene ring fused to a five-membered nitrogen-containing pyrrole ring. The participation of the nitrogen lone electron pair in the aromatic ring means that indole is not a base, and it does not behave like a simple amine. Indole is a microbial metabolite and it can be produced by bacteria as a degradation product of the amino acid tryptophan. It occurs naturally in human feces and has an intense fecal smell. At very low concentrations, however, indole has a flowery smell and is a constituent of many flower scents (such as orange blossoms) and perfumes. As a volatile organic compound, indole has been identified as a fecal biomarker of Clostridium difficile infection (PMID: 30986230). Natural jasmine oil, used in the perfume industry, contains around 2.5% of indole. Indole also occurs in coal tar. Indole has been found to be produced in a number of bacterial genera including Alcaligenes, Aspergillus, Escherichia, and Pseudomonas (PMID: 23194589, 2310183, 9680309). Indole plays a role in bacterial biofilm formation, bacterial motility, bacterial virulence, plasmid stability, and antibiotic resistance. It also functions as an intercellular signalling molecule (PMID: 26115989). Recently, it was determined that the bacterial membrane-bound histidine sensor kinase (HK) known as CpxA acts as a bacterial indole sensor to facilitate signalling (PMID: 31164470). It has been found that decreased indole concentrations in the gut promote bacterial pathogenesis, while increased levels of indole in the gut decrease bacterial virulence gene expression (PMID: 31164470). As a result, enteric pathogens sense a gradient of indole concentrations in the gut to migrate to different niches and successfully establish an infection.
Threonylproline is a dipeptide composed of threonine 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.
Asymmetric dimethylarginine (ADMA) is a naturally occurring chemical found in blood plasma. It is a metabolic by-product of continual protein modification processes in the cytoplasm of all human cells. It is closely related to L-arginine, a conditionally-essential amino acid. ADMA interferes with L-arginine in the production of nitric oxide, a key chemical to endothelial and hence cardiovascular health. Asymmetric dimethylarginine is created in protein methylation, a common mechanism of post-translational protein modification. This reaction is catalyzed by an enzyme set called S-adenosylmethionine protein N-methyltransferases (protein methylases I and II). The methyl groups transferred to create ADMA are derived from the methyl group donor S-adenosylmethionine, an intermediate in the metabolism of homocysteine. (Homocysteine is an important blood chemical, because it is also a marker of cardiovascular disease). After synthesis, ADMA migrates into the extracellular space and thence into blood plasma. Asymmetric dimethylarginine is measured using high performance liquid chromatography. ADMA has been identified as a uremic toxin according to the European Uremic Toxin Working Group (PMID: 22626821).
Guanidinosuccinic acid (GSA) has been identified as a uremic toxin according to the European Uremic Toxin Working Group (PMID:22626821). It is one of the earliest uremic toxins isolated and its toxicity identified. Its metabolic origins show that it arose from the oxidation of argininosuccinic acid (ASA) by free radicals. The stimulus for this oxidation, occurring optimally in the presence of the failed kidney, is the rising level of urea which, through enzyme inhibition, results in a decline in hepatic levels of the semi-essential amino acid, arginine. It is further noted that concentrations of GSA in both serum and urine decline sharply in animals and humans exposed to the essential amino acid, methionine. Uremic patients suffer from a defective ability to generate methyl groups due to anorexia, dietary restrictions and renal protein leakage. This leads to the accumulation of homocysteine, a substance known to produce vascular damage. Even in healthy subjects intake of choline together with methionine is insufficient to satisfy total metabolic requirements for methyl groups. In end-stage renal disease, therefore, protein restriction contributes to the build-up of toxins in uremia. Replacement using specific amino acid mixtures should be directed toward identified deficiencies and adequacy monitored by following serum levels of the related toxins, in this case GSA and homocysteine. (PMID 12701806).
Heptanoic acid or heptanoate, also known as enanthylic acid, or enanthic acid, is an organic compound composed of a seven-carbon chain terminating in a carboxylic acid. It 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. Heptanoate is a very weakly acidic compound, is slightly soluble in water, but very soluble in ethanol and ether. It is an oily Liquid with an unpleasant, rancid odor that contributes to the odor of some rancid oils. Present in essential oils, such as violet leaf oil, palm oil, it is also found in apple, feijoa fruit, clove bud, ginger, black tea, morello cherry, grapes, rice bran, scallops, leek and other foodstuffs such as strawberry jam, soups and sauces. Heptanoic acid is used in the preparation of esters, such as ethyl heptanoate, which are used in fragrances and as artificial flavors. It is one of many additives in cigarettes. Heptanoic acid is used to esterify steroids in the preparation of drugs such as testosterone enanthate, trenbolone enanthate, drostanolone enanthate, and methenolone enanthate (Primobolan). It is used as one of the components in washing solutions and used to assist lye peeling (by immersion into a lye solution) of fruit and vegetables.
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).
Pimelic acid, also known as heptanedioic acid is a dicarboxylic acid.  Derivatives of pimelic acid are involved in the biosynthesis of the amino acid called lysine. Pimelic acid is one methylene longer than a related dicarboxylic acid, adipic acid, a precursor to many polyesters and polyamides. Pimelic acid is essential for the synthesis of biotin (also called vitamin B7). Biotin is a heterocyclic, S-containing monocarboxylic acid that is made from two precursors, alanine and pimeloyl-CoA. Biotin is important in fatty acid synthesis, branched-chain amino acid catabolism, and gluconeogenesis. Biotin is found in a wide range of foods. Likewise, intestinal bacteria synthesize biotin, which is then absorbed by the host animal. Pimelic acid (which is the precursor for pimeloyl-CoA) is synthesized in many bacteria via a head-to-tail incorporation of acetate units through a modified fatty acid synthetic pathway using O-methyl esters disguised to resemble the canonical intermediates of the fatty acid synthetic pathway (PMID:21435937). Some bacteria and yeast synthesize pimelic acid not by biosynthesis, but via cleavage of longer chain fatty acids (such as linolenic acid) via a cytochrome P450-like enzyme (PMID:28196402, 21435937, 3236079). Pimelic acid is excreted in elevated amounts in the urine of individuals with mitochondrial beta-oxidation disorders and peroxisomal beta oxidation disorders (PMID:1527989)
Triethanolamine, also known as H3TEA or trolamine, 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. A 2009 study stated that patch test reactions reveal a slight irritant potential instead of a true allergic response in several cases, and also indicated the risk of skin sensitization to TEOA seems to be very low. Triethanolamine is a drug. Triethanolamine is a potentially toxic compound. Triethanolamine aka Trolamine (abbr. as TEOA to distinguish it from TEA which is for triethylamine) is a viscous organic compound that is both a tertiary amine and a triol. TEOA is used to provide a sensitivity boost to silver-halide-based holograms, and also as a swelling agent to color shift holograms. Approximately 150,000 tonnes were produced in 1999.
Imidazol-4-ylacetic acid is a monocarboxylic acid that is acetic acid in which one of the methyl hydrogens has been replaced by an imidazol-4-yl group. It has a role as a mouse metabolite. It is a monocarboxylic acid and a member of imidazoles. It derives from an acetic acid. It is a conjugate acid of an imidazol-4-ylacetate. It is a tautomer of an imidazol-5-ylacetic acid and a 2H-imidazol-4-ylacetic acid. Imidazoleacetic acid, also known as 4(5)-imidazoleacetate or IAA, belongs to the class of organic compounds known as imidazolyl carboxylic acids and derivatives. These are organic compounds containing a carboxylic acid chain (of at least 2 carbon atoms) linked to an imidazole ring. Imidazoleacetic acid exists in all living organisms, ranging from bacteria to humans. imidazoleacetic acid can be biosynthesized from imidazole-4-acetaldehyde through its interaction with the enzyme aldehyde dehydrogenase, mitochondrial. In humans, imidazoleacetic acid is involved in histidine metabolism. Outside of the human body, Imidazoleacetic acid has been detected, but not quantified in several different foods, such as chinese cinnamons, jostaberries, vanilla, butternut squash, and red rices. Imidazoleacetic acid is a potentially toxic compound. Imidazoleacetic acid is a metabolite product of Histamine metabolism.
N-Acetyl-3-methylhistidine, an N-acetyl-L-amino acid, 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-3-methylhistidine is an acetylated derivative of 3-methylhistidine and a very strong basic compound (based on its pKa). N-Acetyl-3-methylhistidine has been found to be associated with prostate cancer (PMID: 28423352).
Isovalerylglycine (IVG) 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. Isovalerylglycine is a byproduct of the catabolism of the aminoacid leucine. Accumulation of isovalerylglycine occurs in Isovaleric Acidemia (IVA). IVA (OMIM/ McKusick 243500) is an autosomal recessive disorder caused by mutations in the isovaleryl-CoA dehydrogenase (EC 1.3.99.10) gene. The deficiency of this enzyme in the metabolism of leucine leads to the accumulation of a series of isovaleryl-CoA metabolites, such as isovalerylglycine. It is very important to caution for false positive results when screening for isovaleric acidemia by tandem mass spectrometry based on dried blood-spot levels of C5-acylcarnitines, including isovalerylcarnitine and its isomer, pivaloylcarnitine; pivaloylcarnitine is derived from pivalate-generating antibiotics, and has caused many false-positive results (PMID: 17850781). Isovalerylglycine is a biomarker for the consumption of cheese.
2-Oxoadipic acid is produced from lysine in the cytosol of cells via the saccharopine and the pipecolic acid pathways. Catabolites of hydroxylysine and tryptophan enter these pathways as 2-aminoadipic- -semialdehyde and 2-oxoadipate, respectively. In the matrix of mitochondria, 2-oxoadipate is decarboxylated to glutaryl-CoA by the 2-oxoadipate dehydrogenase complex and then converted to acetyl-CoA. 2-Oxoadipic aciduria is an in-born error of metabolism of lysine, tryptophan, and hydroxylysine, in which abnormal quantities of 2-aminoadipic acid are found in body fluids along with 2-oxoadipic acid. Patients with 2-Oxoadipic acidemias are mentally retarded with hypotonia or seizures. 2-Oxoadipic aciduria can occur in patients with Kearns-Sayre Syndrome, a progressive disorder with onset prior to 20 years of age in which multiple organ systems are affected, including progressive external ophthalmoplegia, retinopathy, and the age of onset, and these are associated classically with abnormalities in cardiac conduction, cerebellar signs, and elevated cerebrospinal fluid protein (PMID: 10655159, 16183823, 11083877). Oxoadipic acid is found to be associated with alpha-aminoadipic aciduria, which is an inborn error of metabolism.
N-Acetylmethionine sulfoxide (CAS: 3054-51-1), also known as N-ACMSO or 2-(acetylamino)-4-(methylsulfinyl)butanoic acid, 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-Acetylmethionine sulfoxide has been identified in the human placenta (PMID: 32033212).
N-Acetyltaurine (also known as NAT) is a highly water-soluble and hygroscopic compound formed by the acetylation of taurine. It is both an endogenous metabolite that is constitutively synthesized in the body and an exogenous metabolite formed by ethanol metabolism. NAT is formed by one or multiple N-acetylation reactions between taurine and ethanol metabolites (primarily acetate). The enzyme responsible for NAT synthesis is called NAT synthase, a cytosolic metalloenzyme located in the kidney and liver that can directly catalyze the esterification reaction between taurine and acetate, without the involvement of ATP and CoA. NAT is a potential biomarker of hyperacetatemia as well as ethanol consumption (PMID: 22228769). NAT is typically found in human urine with normal concentrations of 0.599-1.38 umol/mmol creatinine in alcohol-abstinent subjects. NAT can reach average levels of 8.38 umol/mmol creatinine (range 5.39-10.47 umol/mmol creatinine) in subjects consuming alcohol within 3 to 6 h after the start of drinking. Positive NAT results can be used as an indicator for recent alcohol consumption (PMID: 27520321). NAT is considered a direct alcohol biomarker that specifically represents the oxidative pathway of ethanol metabolism. Other direct alcohol biomarkers such as fatty acid ethyl esters (FAEE), ethyl glucuronide, ethyl sulfate, and phosphatidylethanol reflect the non-oxidative pathway of alcohol metabolism. NAT is also elevated in urine after periods of endurance exercise. NAT was previously found in nature as a major component in the sticky droplet of orb spider web. Due to its high hygroscopicity, N-acetyltaurine appears to ensure the orb spider’s web flexibility.
N-formyl-L-methionine is a L-methionine derivative in which one of the hydrogens attached to the nitrogen is replaced by a formyl group. It has a role as a metabolite. It is a proteinogenic amino acid, a N-formyl amino acid and a L-methionine derivative. It is a conjugate acid of a N-formyl-L-methioninate. N-Formyl-L-methionine belongs to the class of organic compounds known as methionine and derivatives. Methionine and derivatives are compounds containing methionine or a derivative thereof resulting from reaction of methionine at the amino group or the carboxy group, or from the replacement of any hydrogen of glycine by a heteroatom. N-Formyl-L-methionine is effective in the initiation of protein synthesis. The initiating methionine residue enters the ribosome as N-formylmethionyl-tRNA. This process occurs in Escherichia coli and other bacteria as well as in the mitochondria of eukaryotic cells.
4-Hydroxycinnamic acid, also known as p-Coumaric acid, is a coumaric acid in which the hydroxy substituent is located at C-4 of the phenyl ring. It has a role as a plant metabolite. It is a conjugate acid of a 4-coumarate. p-coumaric acid is an organic compound that is a hydroxy derivative of cinnamic acid. There are three isomers of coumaric acid: o-coumaric acid, m-coumaric acid, and p-coumaric acid, that differ by the position of the hydroxy substitution of the phenyl group. p-Coumaric acid is the most abundant isomer of the three in nature. p-Coumaric acid exists in two forms trans-p-coumaric acid and cis-p-coumaric acid. It is a crystalline solid that is slightly soluble in water, but very soluble in ethanol and diethyl ether. 4-Hydroxycinnamic acid belongs to the class of organic compounds known as hydroxycinnamic acids. Hydroxycinnamic acids are compounds containing an cinnamic acid where the benzene ring is hydroxylated. 4-Hydroxycinnamic acid exists in all living species, ranging from bacteria to humans. Outside of the human body, 4-Hydroxycinnamic acid is found, on average, in the highest concentration within a few different foods, such as pepper (Capsicum frutescens), pineapples, and sunflowers and in a lower concentration in spinachs, kiwis, and sweet oranges. 4-Hydroxycinnamic acid has also been detected, but not quantified in several different foods, such as wild rices, soursops, garden onions, hyssops, and avocado.
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).
Isoleucyl-Glycine is a dipeptide composed of isoleucine 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. This dipeptide has not yet been identified in human tissues or biofluids and so it is classified as an 'Expected' metabolite.
Isoleucyl-Aspartate is a dipeptide composed of isoleucine and aspartate. 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.
gamma-Glutamyltryptophan is a dipeptide composed of gamma-glutamate and tryptophan, 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-Glutamyltryptophan 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.
1,2,3-Propanetricarboxylic acid is found in corn. 1,2,3-Propanetricarboxylic acid is isolated from plants e.g. sugarbeet sap, sap of Acer saccharinum (maple syrup). Propane-1,2,3-tricarboxylic acid, also known as tricarballylic acid, carballylic acid, and beta-carboxyglutaric acid, is a tricarboxylic acid that has three carboxylic acid functional groups. The compound is an inhibitor of the enzyme aconitase and interferes with the Krebs cycle. 1,2,3-Propanetricarboxylic acid can be produced by Bacteroides, Butyrivibrio, Megasphaera, Wolinella and fungi Nectriaceae (PMID:22815244; PMID:16346691). It is also associated with Fumonisins. Fumonisins are fungal toxins produced by Fusarium verticilloides. Detection of this compound indicates presence of fumonisins in gastrointestinal tract. Corn intake or corn contaminated with fumonisins can lead to increased levels of tricarballylic acid (PMID:22815244).
Propionylglycine 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-acylglycineThe level of propionylglycine is elevated in patients with propionic acidemia, which is an inherited deficiency of propionyl-CoA carboxylase. (Disorders of propionate and methylmalonate metabolism. In The Metabolic and Molecular Bases of Inherited Disease).
N-Heptanoylglycine is an acylglycine with C-7 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.
Hexanoylglycine 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-acylglycineHexanoylglycine is a fatty acid metabolite, it appears in the urine of patients with hereditary medium-chain acyl-CoA dehydrogenase (MCAD) deficiency (PMID 2775902), which is a genetic disorder.
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.
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).
Ureidopropionic acid, also known as 3-ureidopropanoate or N-carbamoyl-beta-alanine, belongs to the class of organic compounds known as ureas. Ureas are compounds containing two amine groups joined by a carbonyl (C=O) functional group. Ureidopropionic acid is an intermediate in the metabolism of uracil. More specifically, it is a breakdown product of dihydrouracil and is produced by the enzyme dihydropyrimidase. It is further decomposed into beta-alanine via the enzyme beta-ureidopropionase. Ureidopropionic acid is essentially a urea derivative of beta-alanine. High levels of ureidopropionic acid are found in individuals with beta-ureidopropionase (UP) deficiency (PMID: 11675655). Enzyme deficiencies in pyrimidine metabolism are associated with a risk for severe toxicity against the antineoplastic agent 5-fluorouracil. Ureidopropionic acid has been detected, but not quantified in, several different foods, such as gram beans, broccoli, climbing beans, oriental wheat, and mandarin orange (clementine, tangerine). This could make ureidopropionic acid a potential biomarker for the consumption of these foods.
Gulonic acid, also known as gulonate, belongs to the class of organic compounds known as medium-chain hydroxy acids and derivatives. These are hydroxy acids with a 6 to 12 carbon atoms long side chain.It is a gulonic acid having D-configuration.
Nicotinamide N-oxide is recognized as an in vivo metabolite of nicotinamide which is a precurser of nicotinamide-adenine dinucleotide (NAD+) in animals. The enzyme that catalyses the reduction of nicotinamide N-oxide to nicotinamide in liver is xanthine oxidase.
3-Hydroxypyridine sulfate belongs to the class of organic compounds known as arylsulfates. These are organic compounds containing a sulfate group that carries an aryl group through an ether group. 3-Hydroxypyridine sulfate is a potential urinary biomarker of whole grain intake (PMID: 27805021).
4-Hydroxychlorothalonil (SDS 3701) is a metabolite of the widely used fungicide chlorothalonil which is used to manage fungal diseases affecting agricultural crops around the world (PMID: 31265862). 4-Hydroxychlorothalonil was identified as one of forty plasma metabolites that could be used to predict gut microbiome Shannon diversity (PMID: 31477923). Shannon diversity is a metric that summarizes both species abundance and evenness, and it has been suggested as a marker for microbiome health.
6-Oxopiperidine-2-carboxylic acid, also known as 6-Oxo-pipecolinic acid, or 6-Oxo-piperidine-2-carboxylic acid, is associated with penicillin V in the production on Penicillium chrysogenum fermentations. Analysis of a 13C NMR spectrum of a concentrated broth from Penicillium chrysogenum fermentation revealed the presence of penicillin V and 6-oxo-piperidine-2-carboxylic acid(1) as the principal constituents. The latter lactam, identical to an authentic sample prepared by the cyclization of alpha-aminoadipic acid was present to the extent of 28 mol% of penicillin V. The lactam isolated form the broth was nearly racemic, having a slight excess of the L-isomer. This isolation provides further evidence regarding the biosynthetic precursors of the hydrophobic penicillins. (PMID: 6788737
2-Piperidinone is a derivative of piperidine which is an organic compound. Piperidine is a colorless fuming liquid with an odor described as ammoniacal, pepper-like, the name comes from the genus name Piper, which is the Latin word for pepper. Piperidine is a widely used building block and chemical reagent in the synthesis of organic compounds, including pharmaceuticals.The piperidine structural motif is present in numerous natural alkaloids. These include piperine, which gives black pepper the hot taste. This gave the compound its name.
Daidzein is one of several known isoflavones. Isoflavones compounds are found in a number of plants, but soybeans and soy products like tofu and textured vegetable protein are the primary food source. Up until recently, daidzein was considered to be one of the most important and most studied isoflavones, however more recently attention has shifted to isoflavone metabolites. Equol represents the main active product of daidzein metabolism, produced via specific microflora in the gut. The clinical effectiveness of soy isoflavones may be a function of the ability to biotransform soy isoflavones to the more potent estrogenic metabolite, equol, which may enhance the actions of soy isoflavones, owing to its greater affinity for estrogen receptors, unique antiandrogenic properties, and superior antioxidant activity. However, not all individuals consuming daidzein produce equol. Only approximately one-third to one-half of the population is able to metabolize daidzein to equol. This high variability in equol production is presumably attributable to interindividual differences in the composition of the intestinal microflora, which may play an important role in the mechanisms of action of isoflavones. But, the specific bacterial species in the colon involved in the production of equol are yet to be discovered. (PMID:18045128, 17579894). Daidzein is a biomarker for the consumption of soy beans and other soy products.
L-allothreonine is the L-enantiomer of allothreonine. It has a role as an Escherichia coli metabolite and a Saccharomyces cerevisiae metabolite. It is an enantiomer of a D-allothreonine. It is a tautomer of a L-allothreonine zwitterion. Allothreonine is the substrate of the enzyme Serine hydroxymethyltransferase1 (SHMT, EC 2.1.2.1), a human cytoplasmic mRNA binding protein. SHMT uses pyridoxal 5'-phosphate (PLP) and tetrahydropteroylglutamate (H4PteGlu) as coenzymes and catalyzes the reversible interconversion of serine and glycine. In addition to these physiological reactions, SHMT also catalyzes, in the absence of H4PteGlu, the retroaldol cleavage of several 3-hydroxyamino acids, such as allothreonine. Allothreonine is a plant metabolite that appears in the human diet in variable concentrations depending on: plant species, physiological changes during plant growth, senescence, and reactions to environmental stress or to changes due to plant transformation (PMID:10858298, 10952545).
3-[3-(sulfooxy)phenyl]propanoic acid, also known as 3-(3-Hydroxyphenyl)propanoate sulfate or Mhppa sulfate, is classified as a member of the phenylsulfates. Phenylsulfates are compounds containing a sulfuric acid group conjugated to a phenyl group. 3-[3-(sulfooxy)phenyl]propanoic acid is considered to be a slightly soluble (in water) and an extremely strong acidic compound. 3-[3-(sulfooxy)phenyl]propanoic acid can be found in feces.
Homocarnosine is a normal human metabolite, the brain-specific dipeptide of gamma-aminobutyric acid (GABA) and histidine. (PMID 1266573). Increased concentration of CSF homocarnosine has been found in familial spastic paraplegia. (PMID 842287). Homocarnosinosis (an inherited disorder, OMIM 236130) is characterized by an elevated level of the dipeptide homocarnosine (Hca) in the Cerebrospinal fluid (CSF) and the brain and by carnosinuria and serum carnosinase deficiency, and can co-exist with paraplegia, retinitis pigmentosa, and a progressive mental deficiency. (PMID 3736769). In glial tumors of human brain the content of homocarnosine has been found to be lower than in brain tissue (PMID 1032224), while an increase in content of homocarnosine was observed in brain tissue of animals under experimental trauma of cranium. (PMID 1025883).
N-Acetylglucosamine 6-phosphate (CAS: 1746-32-3), also known as GlcNAc6P, belongs to the class of organic compounds known as acylaminosugars. These are organic compounds containing a sugar linked to a chain through an N-acyl group. Outside of the human body, N-acetylglucosamine 6-phosphate has been detected, but not quantified in, several different foods, such as butternut squash, breakfast cereals, babassu palms, vaccinium (blueberry, cranberry, huckleberry), and cauliflowers. This could make N-acetylglucosamine 6-phosphate a potential biomarker for the consumption of these foods. N-Acetylglucosamine 6-phosphate has been identified in the human placenta (PMID: 32033212).
2-Phosphoglyceric acid (2PGA) is a glyceric acid which serves as the substrate in the ninth step of glycolysis. It is catalyzed by enolase into phosphoenolpyruvate (PEP), the penultimate step in the conversion of glucose to pyruvate. Enolase catalyzes the beta-elimination reaction in a stepwise manner wherein OH- is eliminated from C3 of a discrete carbanion (enolate) intermediate. This intermediate is created by removal of the proton from C2 of 2PGA by a base in the active site (PMID: 8994873, Wikipedia).
Uridine diphosphate glucuronic acid is a nucleoside diphosphate sugar which serves as a source of glucuronic acid for polysaccharide biosynthesis. It may also be epimerized to UDP Iduronic acid, which donates Iduronic acid to polysaccharides. In animals, UDP glucuronic acid is used for formation of many glucosiduronides with various aglycones. The transfer of glucuronic acid from UDP-alpha-D-glucuronic acid onto a terminal galactose residue is done by beta1,3-glucuronosyltransferases, responsible for the completion of the protein-glycosaminoglycan linkage region of proteoglycans and of the HNK1 epitope of glycoproteins and glycolipids. In humans the enzyme galactose-beta-1,3-glucuronosyltransferase I completes the synthesis of the common linker region of glycosaminoglycans (GAGs) by transferring glucuronic acid (GlcA) onto the terminal galactose of the glycopeptide primer of proteoglycans. The GAG chains of proteoglycans regulate major biological processes such as cell proliferation and recognition, extracellular matrix deposition, and morphogenesis. (PMID:16815917).
2-Indolecarboxylic acid is a strong inhibitor of lipid peroxidation, similar to melatonin and some structurally related indole compounds. Lipid peroxidation with tert-butyl hydroperoxide is a source of free radicals (PMID 12236544). 2-Indolecarboxylic acid is a phenolic components known to exist in Korean ginseng (Koryo Insam Hakhoechi (1996), 20(3), 284-290) and brown rice (Han'guk Nonghwa Hakhoechi (1995), 38(5), 478-83).
Tirofiban prevents the blood from clotting during episodes of chest pain or a heart attack, or while the patient is undergoing a procedure to treat a blocked coronary artery. It is a non-peptide reversible antagonist of the platelet glycoprotein (GP) IIb/IIIa receptor, and inhibits platelet aggregation.
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).
Tantalum is a transition metal (atomic number 73; atomic weight 180.05) that remains relatively inert in vivo. Dating back to the mid-1900s multiple medical devices have been fabricated that utilize this material, including: pacemaker electrodes, foil and mesh for nerve repair, radiopaque markers, and cranioplasty plates. Tantalum-based implants have displayed an exceptional biocompatibility and safety record in orthopedic, cranio-facial, and dentistry literature. The basic structure of this porous tantalum metal yields a high volumetric porosity, a low modulus of elasticity, and relatively high frictional characteristics. Tantalum is known to be relatively inert in vivo and is now used as plates, sutures, radio-markers, and prostheses covering a wide variety of medical subspecialties and procedures. Dental implants have yielded excellent 8-year follow-up with tantalum-based components used for osseous anchorage. The oxide formed on the surface of tantalum implants (self-passivation) in vivo has been found to be quite stable over a wide range of pH and potential ranges. On high-resolution examination, titanium was found to have no multi-nucleated macrophages in the tissue surrounding the metallic implant, while tantalum implants displayed an occasional peri-implant macrophage. Physiologically, it exists as an ion in the body. Overall porous tantalum is corrosion resistant, may be associated with less peri-implant stress shielding, and has the potential to allow for immediate weight bearing (given its high frictional characteristics). These inherent properties and proven biocompatibility make porous tantalum an intriguing metal for the design and manufacture of: press-fit or cementless components for total joint arthroplasty, bone graft substitute, or a scaffold for potential cartilage resurfacing. (PMID: 16737737).
Phenmetrazine is only found in individuals that have used or taken this drug. It is a sympathomimetic drug used primarily as an appetite depressant. Its actions and mechanisms are similar to dextroamphetamine. [PubChem]Phenmetrazine is thought to block the reuptake of norepinephrine and dopamine into the presynaptic neuron leading to an increase in the release of these monoamines into the extraneuronal space. Dopamine integrates incoming sensory stimuli, initiates and controls fine movement (nigro-neostriatal pathway), controls emotional behavior (midbrain mesolimbic-forebrain system) and controls hypothalamic-pituitary endocrine system (tubero-infundibular system). It is this latter effect on the tubero-infundibular systm that seems to lead to reduced food intake. Phenmetrazine also acts as a monoamine oxidase inhibitor.
D-Arabino-hexos-2-ulose is formed during sterilisation of foods by irradiation
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).
Tamarixetin is a flavanoid component of the Ginko Biloba extract. Exhibits antioxidant properties.
Clobetasol is only found in individuals that have used or taken this drug. It is a derivative of prednisolone with high glucocorticoid activity and low mineralocorticoid activity. Absorbed through the skin faster than fluocinonide, it is used topically in treatment of psoriasis but may cause marked adrenocortical suppression. [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. 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>. Initially, however, clobetasol, like other corticosteroids, bind to the glucocorticoid receptor, which complexes, enteres the cell nucleus and modifies genetic transcription (transrepression/transactivation).
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-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).
Polythiazide is only found in individuals that have used or taken this drug. It is a thiazide diuretic with actions and uses similar to those of hydrochlorothiazide. (From Martindale, The Extra Pharmacopoeia, 30th ed, p826)As a diuretic, polythiazide inhibits active chloride reabsorption at the early distal tubule via the thiazide-sensitive Na-Cl cotransporter (TSC), resulting in an increase in the excretion of sodium, chloride, and water. Thiazides like polythiazide 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 polythiazide 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.
3-Indolebutyric acid is an indolic tryptophan metabolite occasionally found in human urine. (PMID:7130309). 3-Indolebutyric acid is a plasma and urinary tryptophan-related metabolite related to metabolic and skin diseases. (PMID:15206797). Plasma levels of tryptophan metabolites in the umbilical vein and artery are significantly higher than those in the maternal vein. (PMID:1506727). 3-Indolebutyric acid has been shown to accelerated glucose uptake in the rat diaphragm. (PMID:6025019). 3-Indolebutyric acid is also a microbial netabolite, urinary indole-3-butyrate is produced by Clostridia sp. (PMID:6630445).
Glutethimide is only found in individuals that have used or taken this drug. It is a hypnotic and sedative. Its use has been largely superseded by other drugs. [PubChem]Glutethimide seems to be a GABA agonist which helps induced sedation. It also induces CYP 2D6. When taken with codeine, it enables the body to convert higher amounts of the codeine (higher than the average 5 - 10%) to morphine. The general sedative effect also adds to the power of the combination.
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.
Adenosine monophosphate, also known as 5'-adenylic acid and abbreviated AMP, is a nucleotide that is found in RNA. It is an ester of phosphoric acid with the nucleoside adenosine. AMP consists of the phosphate group, the pentose sugar ribose, and the nucleobase adenine. AMP can be produced during ATP synthesis by the enzyme adenylate kinase. AMP has recently been approved as a 'Bitter Blocker' additive to foodstuffs. When AMP is added to bitter foods or foods with a bitter aftertaste it makes them seem 'sweeter'. This potentially makes lower calorie food products more palatable.
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.
1-salicylate glucuronide is a natural human metabolite of 1-salicylate 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.
Aflatoxin M1 is found in milk and milk products. Minor mycotoxin of Aspergillus flavus, also found in the milk of cows and sheep fed toxic meal. Metab. of Aflatoxin B1 <ht>JHZ87-P</ht> [CCD].Aflatoxins are naturally occurring mycotoxins that are produced by many species of Aspergillus, a fungus, most notably Aspergillus flavus and Aspergillus parasiticus. Aflatoxins are toxic and among the most carcinogenic substances known. Aflatoxin M1 is a metabolite of aflatoxin B1 in humans and animals. (Wikipedia)
Trigonelline, also known as caffearin or gynesine, belongs to the class of organic compounds known as alkaloids and derivatives. These are naturally occurring chemical compounds that contain mostly basic nitrogen atoms. This group also includes some related compounds with neutral and even weakly acidic properties. 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. It is also found in coffee, where it may help to prevent dental caries by preventing the bacteria Streptococcus mutans from adhering to teeth. Trigonelline is an alkaloid with chemical formula C7H7NO2 and CAS number 535-83-1. Trigonelline is a product of the metabolism of niacin (vitamin B3) which is excreted in the urine. High amounts of trigonelline have been found in arabica coffee, fenugreeks, and common peas. Another foods such as yellow bell peppers, orange bellpeppers and muskmelons also contain trigonelline but in lower concentrations. Trigonelline has also been detected but not quantified in several different foods, such as rices, triticales, alfalfa, cereals and cereal products, and ryes. Trigonelline in the urine is a biomarker for the consumption of coffee, legumes and soy products.
Urocanic acid (CAS: 104-98-3) is a breakdown (deamination) product of histidine. In the liver, urocanic acid is an intermediate in the conversion of histidine to glutamic acid, whereas, in the epidermis, it accumulates and may be both a UV protectant and an immunoregulator. Urocanic acid (UA) exists as a trans isomer (t-UA, approximately 30 mg/cm2) in the uppermost layer of the skin (stratum corneum). t-UA is formed as the cells of the second layer of the skin become metabolically inactive. During this process, proteins and membranes degrade, histidine is released, and histidase (histidine ammonia lyase) catalyzes the deamination of histidine to form t-UA. t-UA accumulates in the epidermis until removal by either the monthly skin renewal cycle or sweat. Upon absorption of UV light, the naturally occurring t-UA isomerizes to its cis form, c-UA. Because DNA lesions (e.g., pyrimidine dimers) in the lower epidermis can result from UV-B absorption, initial research proposed that t-UA acted as a natural sunscreen absorbing UV-B in the stratum corneum before the damaging rays could penetrate into lower epidermal zones. Researchers have found that c-UA also suppresses contact hypersensitivity and delayed hypersensitivity, reduces the Langerhans cell count in the epidermis, prolongs skin-graft survival time, and affects natural killer cell activity. (E)-Urocanic acid is found in mushrooms. It has been isolated from Coprinus atramentarius (common ink cap) and Phallus impudicus (common stinkhorn).
Lactapiperanol B is found in mushrooms. Lactapiperanol B is a constituent of Lactarius piperatus.
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.
OR-1896 is a metabolite of levosimendan. Levosimendan is a calcium sensitiser used in the management of acutely decompensated congestive heart failure. It is marketed under the trade name Simdax. (Wikipedia)
Emulsifier, flavour-enhancer, humectant, pH control agent, glycerol substitute and other food processing uses. Sodium lactate is the sodium salt of lactic acid produced by fermentation of a sugar source, such as corn or beets. As a food additive, sodium lactate has the E number E325 and naturally is a Liquid product, but also is available in powder form.
Emulsifier, flavour-enhancer, humectant, pH control agent, glycerol substitute and other food processing uses. Sodium lactate is the sodium salt of lactic acid produced by fermentation of a sugar source, such as corn or beets. As a food additive, sodium lactate has the E number E325 and naturally is a Liquid product, but also is available in powder form.
Derivative of noroxymorphone that is the N-cyclopropylmethyl congener of naloxone. It is a narcotic antagonist that is effective orally, longer lasting and more potent than naloxone, and has been proposed for the treatment of heroin addiction. The FDA has approved naltrexone for the treatment of alcohol dependence. [PubChem]
2-Methoxybenzenethiol is used as a food additive [EAFUS] ("EAFUS: Everything Added to Food in the United States. [http://www.eafus.com/]")
12(S)-HETrE is also known as (12S)-Hydroxy-(8Z,10E,14Z)-eicosatrienoic acid or 12S-HETrE.  12(S)-HETrE is considered to be practically insoluble (in water) and acidic
15(S)-hydroxyeicosatrienoic acid (15S-HETrE) is the in vivo metabolite of gamma-linolenic acid, a polyunsaturated fatty acid that have been reported to modulate arachidonic acid (AA) metabolism and tumorigenesis. 15S-HETrE suppress cyclooxygenase-2 (COX-2) over expression and/or Prostaglandin E2 (PGE2) biosynthesis (PMID 15197770), and inhibits [(3)H]thymidine uptake in parallel with the upregulation of peroxisome proliferator-activated receptor-gamma expression (a growth modulating nuclear receptor, PPARgamma). (PMID 12445673).
(E,E)-N-4-Methoxystyrylcinnamide is found in fruits. (E,E)-N-4-Methoxystyrylcinnamide is an alkaloid from the leaves of Aegle marmelos (bael fruit
Dopexamine is a 1 and 2-adrenergic receptor agonist. It also acts at dopamine receptors.
Atherosperminine is found in fruits. Atherosperminine is an alkaloid from the stem bark of Annona muricata (soursop
Atherosperminine is found in fruits. Atherosperminine is an alkaloid from the stem bark of Annona muricata (soursop
Sweetening agent, sweetness 1300x sucrose.
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.
Gibberellic acid, also known as gibberellin A3, GA, or GA3, is a very potent hormone whose natural occurrence in plants controls their development. Since GA regulates growth, applications of very low concentrations can have a profound effect while too much will have the opposite effect. Gibberellic acid is a hormone found in plants. Gibberellic acid is a simple gibberellin promoting the growth and elongation of cells. It affects the decomposition of plants. It also helps plants grow if used in small amounts but eventually, plants grow a tolerance for it. Gibberellic acid stimulates the cells of germinating seeds to produce mRNA molecules that code for hydrolytic enzymes.
1-Methoxy-4-methylbenzene, also known as 4-methoxy-toluene or 4-methyl anisole, belongs to the class of organic compounds known as anisoles. These are organic compounds containing a methoxybenzene or a derivative thereof. 1-Methoxy-4-methylbenzene is a camphoraceous, cedar, and cresol tasting compound. 1-methoxy-4-methylbenzene has been detected, but not quantified, in a few different foods, such as garden tomato, herbs and spices, and milk and milk products.
pH-control agent; drying agent; buffer and anticaking agent Magnesium carbonate, MgCO3, is a white solid that occurs in nature as a mineral. Several hydrated and basic forms of magnesium carbonate also exist as minerals. In addition, MgCO3 has a variety of uses.
Acetone cyanohydrin (ACH) is an organic compound used in the production of methyl methacrylate, the monomer of the transparent plastic polymethyl methacrylate (PMMA), also known as acrylic. (Wikipedia)
3-Methylcyclopentadecanone is a flavouring ingredient.Muscone is an organic compound that is the primary contributor to the odor of musk.
2-Naphthol is a colorless crystalline solid and an isomer of 1-naphthol, differing by the location of the hydroxyl group on naphthalene. The naphthols are naphthalene homologues of phenol, with the hydroxyl group being more reactive than in the phenols. 2-Naphthol has several different uses including dyes, pigments, fats, oils, insecticides, pharmaceuticals, perfumes, antiseptics, synthesis of fungicides, and antioxidants for rubber. Detection of 2-Naphthol in urine usually results from long-term persistent exposure to pesticides such as chlorpyrifos, but also due to exposure to naphthalene in older types of mothballs, fires that produce polyaromatic hydrocarbons (PAHs), and tobacco smoke.
Adrenochrome (CAS: 54-06-8) belongs to the class of organic compounds known as indoles and derivatives. These are organic compounds containing an indole, which is a bicyclic ring system made up of a six-membered benzene ring fused to a five-membered nitrogen-containing pyrrole ring. Adrenochrome is a red-coloured oxidation product of adrenaline (epinephrine) that was first isolated and identified by Green and Richter in 1937 (PMID: 16746378). It is highly soluble in water. Adrenochrome can be synthesized from adrenalin via oxidation with silver oxide (PMID: 4581204).
3-Deoxyglucosone (3DG) is a dicarbonyl sugar used as a marker of hyperglycemia in diabetic patients (PMID: 10491986). 3DG is naturally synthesized from the Maillard reaction. It forms after glucose reacts with primary amino groups of lysine and arginine, found in proteins. 3DG also arises via the degradation of fructose 3-phsophate (PMID: 2300805). 3DG is highly reactive toward amine groups. It reacts with amino groups of proteins and forms advanced glycation end-products (AGEs). 3DG as well as AGEs play a role in the modification and cross-linking of long-lived proteins such as crystallin and collagen, contributing to diseases such as the vascular complications of diabetes, atherosclerosis, hypertension, Alzheimer's disease, inflammation, and aging (PMID: 27164965, 10491986, 9836531, 9430981). 3DG inactivates aldehyde reductase (PMID: 7827091).  Aldehyde reductase is the cellular enzyme that protects the body from 3DG. Detoxification of 3DG to 3-deoxyfructose (3DF) is impaired in diabetics. Aminoguanidine (AG) is an investigational drug used to deactivate 3-DG (PMID: 8194672).
Iodipamide is only found in individuals that have used or taken this drug. It is a water-soluble radiographic contrast media for cholecystography and intravenous cholangiography. [PubChem]Organic iodine compounds block x-rays as they pass through the body, thereby allowing body structures containing iodine to be delineated in contrast to those structures that do not contain iodine. The degree of opacity produced by these iodinated organic compounds is directly proportional to the total amount (concentration and volume) of the iodinated contrast agent in the path of the x-rays. Iodipamide's primary excretion through the hepato-biliary system and concentration in bile allows visualization of the gallbladder and biliary ducts.
norsertraline is a metabolite of sertraline. Sertraline hydrochloride (trademark names Zoloft and Lustral) is an antidepressant of the selective serotonin reuptake inhibitor (SSRI) class. It was introduced to the market by Pfizer in 1991. Sertraline is primarily used to treat major depression in adult outpatients as well as obsessive–compulsive, panic, and social anxiety disorders in both adults and children. In 2007, it was the most prescribed antidepressant on the U.S. retail market, with 29,652,000 prescriptions. (Wikipedia)
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.
10Z-Nonadecenoic acid is a monounsaturated fatty acid that has a C19 chain as a backbone and a cis double bond at the C10 position. It 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. 10Z-Nonadecenoic acid is practically insoluble (in water) and a very weakly acidic compound (based on its pKa). 10Z-Nonadecenoic acid can be found in blood and feces. Within the cell, 10Z-nonadecenoic acid is primarily located in the membrane (predicted from logP). It can also be found in the extracellular space.
Vitamin E supplement and antioxidant for foodstuff
Adenosine monophosphate, also known as 5'-adenylic acid and abbreviated AMP, is a nucleotide that is found in RNA. It is an ester of phosphoric acid with the nucleoside adenosine. AMP consists of the phosphate group, the pentose sugar ribose, and the nucleobase adenine. AMP can be produced during ATP synthesis by the enzyme adenylate kinase. AMP has recently been approved as a 'Bitter Blocker' additive to foodstuffs. When AMP is added to bitter foods or foods with a bitter aftertaste it makes them seem 'sweeter'. This potentially makes lower calorie food products more palatable.
Glutamylhydroxyproline is likely a proteolytic breakdown product of collagen. It 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 the formation of a covalent bond from the carbonyl carbon of one to the nitrogen atom of another. It is found in urine (PMID: 3782411).
Ethylene brassylate is a component of fragrances for soaps, detergents, food etc.
1,3-Diphenylpropane is a styrene dimer. Present as an impurity in polystyrene food containers and other products - liberated on heatin
Diisobutylcarbinol is a flavouring ingredien
cevimeline trans-sulfoxide is a metabolite of cevimeline. Cevimeline (Evoxac) is a parasympathomimetic and muscarinic agonist, with particular effect on M3 receptors. It is used in the treatment of dry mouth associated with Sjögren's syndrome. (Wikipedia)
5-Hydroxykynurenamine is an intermediate in the tryptophan metabolic pathway [Kegg: C05638]. It is generated from 5-hydroxykynurenine via the enzyme DOPA decarboxylase.
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).
Homochlorcyclizine is a diphenylmethylpiperazine H1-antihistamine.↵
Prohibited from use in food Chloroacetic acid is the chemical compound with the formula ClCH2CO2H. This carboxylic acid is a useful building block in organic synthesis. Like other chloroacetic acids and related halocarbons, it is a potentially dangerous alkylating agent
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.
Ceftibuten is only found in individuals that have used or taken this drug. It is a third-generation cephalosporin antibiotic. It is an orally-administered agent. Cefalexin is used to treat acute bacterial exacerbations of chronic bronchitis (ABECB), acute bacterial otitis media, pharyngitis, and tonsilitis.Ceftibuten exerts its bactericidal action by binding to essential target proteins of the bacterial cell wall. This binding leads to inhibition of cell-wall synthesis.
Norambreinolide is found in herbs and spices. Norambreinolide is used to enhance the flavour of beverages and foodstuffs. Norambreinolide is a flavouring ingredient. Norambreinolide is a constituent  of labdanum oil and clary sage (Salvia sclarea).
Glycinexylidide 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)
14-hydroxyclarithromycin is a metabolite of clarithromycin. Clarithromycin is a macrolide antibiotic used to treat pharyngitis, tonsillitis, acute maxillary sinusitis, acute bacterial exacerbation of chronic bronchitis, pneumonia (especially atypical pneumonias associated with Chlamydia pneumoniae or TWAR), skin and skin structure infections. In addition, it is sometimes used to treat Legionellosis, Helicobacter pylori, and lyme disease. (Wikipedia)
Neuromedin c is a neuropeptide derived from the same precursor polypeptide as neurotensin, and with similar but subtly distinct expression and effect. Neurotensin is a 13 amino acid neuropeptide that is implicated in the regulation of luteinizing hormone and prolactin release and has significant interaction with the dopaminergic system. Neurotensin was first isolated from extracts of bovine hypothalamus based on its ability to cause a visible vasodilation in the exposed cutaneous regions of anesthetized rats. This structure shows neuromedin C.
T2 Toxin is isolated from Fusarium species and Trichoderma lignorum. T2 Toxin is an important mycotoxin occurring naturally in various agricultural products.
Bitter flavouring It is used in tonics and bitter drinks Quinine is a natural white crystalline alkaloid having antipyretic, antimalarial, analgesic, anti-inflammatory properties and a bitter taste. It is a stereoisomer of quinidine which, unlike quinine, is an anti-arrhythmic. Though it has been synthesized in the lab, the bark of the cinchona tree is the only known natural source of quinine. Quinine was the first effective treatment for malaria caused by Plasmodium falciparum, appearing in therapeutics in the 17th century. It remained the antimalarial drug of choice until the 1940s, when other drugs replaced it.
Acteoside is found in bitter gourd. It is the main hydroxycinnamic derivative in olives
Dedimethylchlorpromazine is a metabolite of chlorpromazine. Chlorpromazine (as chlorpromazine hydrochloride, abbreviated CPZ; marketed in the United States as Thorazine and elsewhere as Largactil) is a typical antipsychotic. First synthesized on December 11, 1950, chlorpromazine was the first drug developed with specific antipsychotic action, and would serve as the prototype for the phenothiazine class of drugs, which later grew to comprise several other agents. (Wikipedia)
Dideoxycytidine 5'-Triphosphate belongs to the class of organic compounds known as pyrimidine 2',3'-dideoxyribonucleoside diphosphates. These are pyrimidine nucleotides with diphosphate group  linked to the ribose moiety lacking a hydroxyl group at positions 2 and 3.
3-keto-Digoxigenin is a metabolite of digoxin. Digoxin is a purified cardiac glycoside and extracted from the foxglove plant, Digitalis lanata. Its corresponding aglycone is digoxigenin, and its acetyl derivative is acetyldigoxin. Digoxin is widely used in the treatment of various heart conditions, namely atrial fibrillation, atrial flutter and sometimes heart failure that cannot be controlled by other medication. Digoxin preparations are commonly marketed under the trade names Lanoxin, Digitek, and Lanoxicaps. (Wikipedia)
Temocapril belongs to the class of organic compounds known as alpha amino acid esters. These are ester derivatives of alpha amino acids.
Temocaprilat belongs to the class of organic compounds known as phenylpropylamines. These are compounds containing a phenylpropylamine moiety, which consists of a phenyl group substituted at the third carbon by an propan-1-amine.
N,N-Dimethylsphingosine is an inhibitor of sphingosine kinase. It is a natural metabolite of sphingosine in some cancer cell lines and tissues. N,N-Dimethylsphingosine inhibited U937 cell sphingosine kinase with a Ki value of 3.1 ¬µM. N,N-Dimethylsphingosine induces apoptosis, but it is not an inhibitor of protein kinase C. N,N-Dimethylsphingosine (DMS) has recently been identified as an inducer of pain in a rat model of chronic pain. (PMID: 22267119) It has properties similar to capsaicin (PMID: 16740613). Other studies have indicated that DMS inhibits airway inflammation in asthma (PMID: 18359884) and is cardioprotective (PMID: 16831409).
N4-Acetylsulfamethoxazole is a metabolite of the sulfonamide bacteriostatic antibiotic sulfamethoxazole. Sulfamethoxazole is metabolized via acetylation catalyzed by liver extramitochondrial N-acetyl transferases. Acetylsulfamethoxazole is excreted in urine. Acetylsulfamethoxazole and sulfamethoxazole can be used as a probe for the molecular percentage enrichment of liver extramitochondrial acetyl-CoA. N4-Acetylsulfamethoxazole can be used as a reference for measuring sulfamethoxazole impurities and waste determination (PMID: 15307787). It is one of the critical aspects of urine and stone analysis (PMID: 3811034) and its quantitative determination in body fluids could be performed by reversed-phase high-performance liquid chromatography, a rapid, precise and simple procedure (PMID: 6668314). It is also reported the renal excretion rate of the metabolite N4-acetylsulfamethoxazole is not dependent on the urinary pH (PMID: 670346). N4-Acetylsulfamethoxazole is only found in individuals who have consumed the drug sulfamethoxazole.
Nickel is a solid, silver-white, hard, malleable transition metal with an atomic number of 28. It resists corrosion even at high temperatures. It is present in many alloys in widespread use, including stainless steels. It may also be present as an impurity in any alloy. Nickel is used in the production of coins, jewellery, and nickel-cadmium batteries, and as a catalyst for the hydrogenation of liquid oils to solid fats such as oleomargarine and vegetable shortening. Nickel-containing dental alloys continue to be used successfully in the provision of various forms of dental care. Many of these alloys have applications in the construction of restorations designed to remain in clinical service for many years, including crowns, fixed bridgework, and removable partial dentures. Furthermore, nickel containing alloys find extensive application in orthodontics, including metallic brackets, arch wires, bands, springs and ligature wires. Many instruments and devises, for example, endodontic instruments also contain nickel. Allergic responses are mediated through the immune system. In a sensitized individual, allergic responses can be initiated by relatively small amounts of the allergen; for example, if nickel ions are released from a nickel plated material following direct and prolonged contact with the skin. Individuals are first sensitized to the allergen. Subsequent exposures, if sufficiently high, may then result in an allergic reaction. A number of allergens are used in the clinical practice of dentistry, notably eugenol, mercury, nickel, chromium, cobalt, components of resin-based materials and a host of other chemical agents. The majority of dental allergies, including allergic responses to nickel-containing dental alloys, comprise Type IV hypersensitivity reactions, cell-mediated by T-lymphocytes. Physiologically, it exists as an ion in the body.(PMID: 17243350, 16405986).
Induces formation of Epstein Barr Virus lymphocytes immediately following infection. (282990).
Licarin C is found in herbs and spices. Licarin C is isolated from nutmeg.
Isomammein is found in fruits. Isomammein is a constituent of Mammea americana (mamey) seeds
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.
3-Hydroxy-2H-pyran-2-one is found in alcoholic beverages. 3-Hydroxy-2H-pyran-2-one is a component of brandy spirit.
5,6-Dihydroxyindole is a substrate for Tyrosinase.
Gestrinone was developed in the early 1970s and was tested clinically as a weekly oral contraceptive in European and North American countries. ]. Without significant advantages over other oral contraceptives and with its high price, gestrinone was no longer used after the Stage II clinical trial. However, from 1982 aroused widespread interest due to substantial therapeutic effects in treating endometriosis. Under different endocrine conditions, gestrinone possesses estrogenic, progestational, androgenic, antiestrogenic and antiprogesterone actions. Starting from gestrinone, chemists can synthesize tetrahydrogestrinone (THG) in one reaction step. THG is a real designer steroid; designer steroids (chemically modified steroids) pose a threat to the integrity of the sport community. These compounds have recently been detected in urine specimens from athletes, resulting in temporary or permanent suspension from amateur and/or professional competition. (PMID: 15934041, 17707720).
Ercalcitriol is the active circulating metabolite of vitamin D2. Vitamin D2 is modified by 25-hydroxylase in the liver and 25-hydroxyvitamin D *-hydroxylase in the kidney to form the active metabolite, ercalcitriol, which is then metabolized by 25-hydroxyvitamin D-24-hydroxylase (24-OHase, CYP24A1, EC 1.14.13.13). The binding of ercalcitriol or their analogs to Vitamin D receptor (VDR), a nuclear receptor, activates VDR to interact with retinoid X receptor (RXR) and forms the VDR/RXR/cofactor complex, which binds to Vitamin D response elements in the promoter region of target genes to regulate gene transcription. The kidney is the major site of 25-hydroxyvitamin D*-hydroxylase (CYP27B1, EC 1.14.13.13), which is responsible for the activation of 25-hydroxyvitamin D. Of all the steroid hormones, ercalcitriol represents the most difficult challenge to the analytical biochemist with respect to quantization. Ercalcitriol circulates at pmol concentrations, is highly lipophilic and its precursor, 25-hydroxyvitamin D2, circulates at nmol levels. (PMID: 16242929, 17867378, 17197173).
3,4-Dihydro-2H-1-benzopyran-2-one, also known as 3,4-dihydrocoumarin or 1,2-benzodihydropyrone, belongs to the class of organic compounds known as 3,4-dihydrocoumarins. These are 3,4-dihydrogenated coumarins. Coumarin is a bicyclic compound that are 1-benzopyran carrying an oxo group at the 2-position. 3,4-Dihydro-2H-1-benzopyran-2-one exists in all living organisms, ranging from bacteria to humans. 3,4-Dihydro-2H-1-benzopyran-2-one is a sweet, almond, and cinnamon tasting compound. 3,4-Dihydro-2H-1-benzopyran-2-one has been detected, but not quantified, in several different foods, such as green vegetables, pulses, sour cherries, and tarragons. A chromanone that is the 3,4-dihydro derivative of coumarin.
3-Propylidene-1(3H)-isobenzofuranone is a flavouring ingredien
6-Methylcoumarin is used as a food additive [EAFUS] ("EAFUS: Everything Added to Food in the United States. [http://www.eafus.com/]")
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).
5beta-cholestane, also known as coprostane or pseudocholestane, is a member of the class of compounds known as cholestane steroids. Cholestane steroids are steroids with a structure containing the 27-carbon cholestane skeleton. Thus, 5beta-cholestane is considered to be a sterol lipid molecule. 5beta-cholestane can be found in rice, which makes 5beta-cholestane a potential biomarker for the consumption of this food product.
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).
Okadaic acid is found in mollusks. Okadaic acid is found in the marine sponges Halichondria okadai and Halichondria melanodocia and shellfish. It is a metabolite of Prorocentrum lima. It is a diarrhetic shellfish toxin. Okadaic acid is a toxin that accumulates in bivalves and causes diarrhetic shellfish poisoning. The molecular formula of okadaic acid, which is a derivative of a C38 fatty acid, is C44H68O13. The IUPAC name of okadaic acid is (2R)-2-hydroxy-3-{(2S,5R,6R,8S)-5-hydroxy-[(1R,2E)-3-((2R,5R,6'S,8'R,8a'S)-8'-hydroxy-6'-{(1S,3S)-1-hydroxy-3-[(3R,6S)-3-methyl-1,7-dioxaspiro[5.5]undec-2-yl]butyl}-7'-methyleneoctahydro-3H,3'H-spiro[furan-2,2'-pyrano[3,2-b]pyran]-5-yl)-1-methylprop-2-en-1-yl]-10-methyl-1,7-dioxaspiro[5.5]undec-10-en-2-yl}-2-methylpropanoic acid. Okadaic acid was named from the marine sponge Halichondria okadai, from which okadaic acid was isolated for the first time. It has also been isolated from another marine sponge, H. malanodocia, as a cytotoxin. The real producer of okadaic acid is a marine dinoflagellate
2,6-Dimethoxyphenol, also known as syringol, 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. 2,6-Dimethoxyphenol is a bacon, balsamic, and medicine tasting compound.
Arginylglycine is a dipeptide composed of arginine 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.
Ajoene is found in onion-family vegetables. Ajoene is isolated from garlic (Allium sativum) extracts. Nutriceutical with anti-cancer properties Ajoene is a chemical compound available from garlic (Allium sativum). The name (and pronunciation) is derived from "ajo", the Spanish word for garlic. It is found as a mixture of two isomers, E-, and Z- 4,5,9-trithiadodeca-1,6,11-triene 9-oxide. Ajoene, an unsaturated disulfide, is formed from the bonding of three allicin molecules. Allicin is a sulfinyl compound that gives garlic its strong odor and flavor. The release of allicin occurs after a garlic clove is crushed or finely chopped. Subsequent formation of ajoene occurs when allicin is dissolved in various solvents including edible oils. Ajoene is also found in garlic extract. Ajoene is most stable and most abundant in macerate of garlic (chopped garlic in edible oil)
Mukonal is found in herbs and spices. Mukonal is an alkaloid from the stem bark of Murraya koenigii (curryleaf tree
Homocysteinesulfinic acid, is involved in many metabolic pathways including trans-sulfuration in cysteine synthesis, re-methylation in methionine synthesis,. trans-methylation of DNA, proteins, and lipids, and biosynthesis of small hormonal and neuronal signaling molecules.
Indolylacryloylglycine (IAG) is a compound that is derived, in the same way as many other indole compounds, from tryptophan or indole compounds in the diet. It is likely a product of gut metabolism although the exact source is still unclear. IAG is elevated in the urine of autistic children with gastrointestinal disturbances.
Atenolol is a so-called beta1-selective (or 'cardioselective') drug. That means that it exerts greater blocking activity on myocardial beta1-receptors than on beta2 ones in the lung. The beta2 receptors are responsible to keep the bronchial system open. If these receptors are blocked, bronchospasm with serious lack of oxygen in the body can result. However, due to its cardioselective properties, the risk of bronchospastic reactions if using atenolol is reduced compared to nonselective drugs as propranolol. Nonetheless, this reaction may also be encountered with atenolol, particularly with high doses. Extreme caution should be exerted if atenolol is given to asthma patients, who are particularly at risk; the dose should be as low as possible. If an asthma attack occurs, the inhalation of a beta2-mimetic antiasthmatic, such as hexoprenalin or salbutamol, will usually suppress the symptoms. Atenolol (trade name Tenormin) can be used to treat cardiovascular diseases such as hypertension, coronary heart disease, arrhythmias, and treatment of myocardial infarction after the acute event. Patients with compensated congestive heart failure may be treated with atenolol as a co medication (usually together with an ACE inhibitor, a diuretic and a digitalis-glycoside, if indicated). In patients with congestive heart failure, it reduces the need for and the consumption of oxygen of the heart muscle. It is very important to start with low doses, as atenolol reduces also the muscular power of the heart, which is an undesired effect in congestive heart failure.
Enterodiol is one of the most important lignan-type phytoestrogens identified in serum, urine, bile, and seminal fluids of humans and animals. Phytoestrogens are a diverse group of compounds found in many edible plants that have, as their common denominator, a phenolic group that they share with estrogenic steroids. This phenolic group appears to play an important role in determining the estrogenic agonist/antagonistic properties of these compounds. Phytoestrogens have been categorized according to their chemical structures as isoflavones, lignans, and coumestans. Enterodiol is formed by bacteria in the intestinal tract from the plant lignans matairesinol and secoisolariciresinol, which exist in various whole-grain cereals (barley, rye, and wheat), seeds, nuts, legumes, and vegetables (PMID: 12270221, J Chromatogr B Analyt Technol Biomed Life Sci. 2002 Sep 25;777(1-2):289-309.). Enterodiol is a biomarker for the consumption of soy beans and other soy products.
Methyloxirane, also known as 2,3-epoxypropane or propylene oxide, belongs to the class of organic compounds known as epoxides. Epoxides are compounds containing a cyclic ether with three ring atoms(one oxygen and two carbon atoms). Methyloxirane is a sweet and ethereal tasting compound. Methyloxirane is a potentially toxic compound.
(E)-Herclavine is found in herbs and spices. (E)-Herclavine is an alkaloid from the bark of Zanthoxylum clava-herculis (Hercules' club
1,3-Diaminopropane, also known as DAP or trimethylenediamine, belongs to the class of organic compounds known as monoalkylamines. These are organic compounds containing a primary aliphatic amine group. 1,3-Diaminopropane is a stable, flammable, and highly hygroscopic fluid. It is a polyamine that is normally quite toxic if swallowed, inhaled, or absorbed through the skin. It is a catabolic byproduct of spermidine. It is also a precursor in the enzymatic synthesis of beta-alanine. 1,3-Diaminopropane is involved in the arginine/proline metabolic pathways and the beta-alanine metabolic pathway. 1,3-Diaminopropane has been detected, but not quantified in, several different foods, such as cassava, shiitakes, oyster mushrooms, muscadine grapes, and cinnamons. This could make 1,3-diaminopropane a potential biomarker for the consumption of these foods.
2-Hydroxyadenine (2-OH-Ade) is formed by hydroxyl radical attack on DNA bases and shows a genotoxicity in human, being the source of the mutations induced by reactive oxygen species. 2-OH-Ade in DNA is miscoding and elicits various mutations, and is a mutagenic in bacterial and mammalian cells. (Recent Research Developments in Biochemistry (2000)2:41-50).
It is used as a food additive .
1-Piperideine-2-carboxylic acid (P2C), also known as Δ1-pipecolic acid, is classified as a member of the tetrahydropyridines. Tetrahydropyridines are derivatives of pyridine in which two double bonds in the pyridine moiety are reduced by adding four hydrogen atoms. 1-Piperideine-2-carboxylic acid is considered to be slightly soluble (in water) and acidic. 1-Piperideine-2-carboxylic acid is an intermediate of the L-lysine metabolic pathway in the brain; the uptake of P2C into the synaptosome of the cerebral cortex was Na+ and temperature-dependent (PMID: 7654748).
2,6-di-tert-butylbenzoquinone is not used for fragrances or flavors.
Ibuprofen is a nonsteroidal anti-inflammatory drug (NSAID) widely marketed under various trademarks including Act-3, Advil, Brufen, Motrin, Nuprin, and Nurofen. It is used for relief of symptoms of arthritis, primary dysmenorrhoea, and fever; Ibuprofen is an NSAID which is believed to work through inhibition of cyclooxygenase (COX), thus inhibiting prostaglandin synthesis. There are at least 2 variations of cyclooxygenase (COX-1 and COX-2), ibuprofen inhibits both COX-1 and COX-2. It appears that its analgesic, antipyretic, and anti-inflammatory activity are achieved principally through COX-2 inhibition; whereas COX-1 inhibition is responsible for its unwanted effects on platelet aggregation and the GI mucosa. As with other NSAIDs, ibuprofen inhibits platelet aggregation, but is not used therapeutically for this action since it is a minor and reversible effect. -- Wikipedia.
4-(Methylnitrosamino)-1-(3-pyridyl)-1-butanone (also known as NNK) is a potent tobacco-specific nitrosamine derived from nicotine. It plays a key role in human tobacco-related cancers (PMID:24830349). NNK is found in cured tobacco and is also produced during its burning or combustion in cigarettes. NNK is abundantly present in cigarette smoke (20-280 ng/cigarette). Electronic cigarettes (e-cigarettes) do not convert nicotine to NNK due to their lower operating temperatures. NNK is a procarcinogen. This means it must be activated by cytochrome P450 enzymes (CYP2A6 and CYP2B6) to become a carcinogen (PMID:24830349). NNK can also be activated by myeloperoxidase (MPO) and epoxide hydrolase (EPHX1). All activation processes lead to the formation of 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanol from NNK, which is called NNAL (PMID:24830349). NNAL can be detoxified via glucuronidation via glucuronidases. Once NNK is activated to NNAL, this compound initiates a cascade of signalling pathways (for example ERK1/2, NF‚âà√≠‚Äö√†¬¥B, PI3K/Akt, MAPK, FasL, K-ras), resulting in uncontrolled cellular proliferation and tumorigenesis. NNK is known as a mutagen and can cause point mutations that affect cell growth proliferation and differentiation. NNK also targets the SULT1A1, TGF-beta, and angiotensin II genes. NNK plays a key role in gene silencing, gene modification, and carcinogenesis. NNK has been implicated in tumour promotion by activating nicotinic acetylcholine receptors (nAChRs) and ‚âà√≠‚Äö√¢¬ß-adrenergic receptors (‚âà√≠‚Äö√¢¬ß-AdrRs), leading to downstream activation of parallel signal transduction pathways that facilitate tumour progression (PMID:24830349). Antioxidants such as EGCG (from green tea) inhibit lung tumorigenesis by NNK.
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).
Nitecapone belongs to the family of Nitrophenols and Derivatives. These are compounds containing a nitrophenol moiety, which consists of a benzene ring bearing both an hydroxyl group and a nitro group on two different ring carbon atoms.
Girinimbine is found in herbs and spices. Girinimbine is an alkaloid from the roots of Murraya koenigii (curry leaf tree
Tolmetin is only found in individuals that have used or taken this drug. It is a non-steroidal anti-inflammatory agent (anti-inflammatory agents, NON-steroidal) similar in mode of action to indomethacin. [PubChem]The mode of action of tolmetin is not known. However, studies in laboratory animals and man have demonstrated that the anti-inflammatory action of tolmetin is not due to pituitary-adrenal stimulation. Tolmetin inhibits prostaglandin synthetase in vitro and lowers the plasma level of prostaglandin E in man. This reduction in prostaglandin synthesis may be responsible for the anti-inflammatory action. Tolmetin does not appear to alter the course of the underlying disease in man.
In patients with chronic fatigue syndrome (CFS) we found increased IgM levels to S-farnesyl-L-cysteine. S-farnesyl-L-cysteine plays a key role in regulating cell growth, differentiation and apoptosis through RAS protein activity. The latter depends on their anchorage to the inner surface of the plasma membrane, which is promoted by their common carboxy-terminal S-farnesyl-cysteine. The presence of antibodies to S-farnesyl-L-cysteine suggest that RAS functions may have undergone damage by oxidative/nitrosative stress, causing disturbed functional activity in the regulation of cell growth. (PMID 17159817).
Cabbage identification factor 2 is found in brassicas. Cabbage identification factor 2 is an alkaloid found on the leaf surfaces of Brassica oleracea cv. botrytis (cauliflower).
7-Azaindolizine is found in animal foods. 7-Azaindolizine is a component of roast beef aroma.
2-Undecyl-4(1H)-quinolinone is found in herbs and spices. 2-Undecyl-4(1H)-quinolinone is an alkaloid from and roots of Ruta graveolens (rue) (as the main component of an inseparable mixture of 2-alkylquinolones contg. the 2-dodecyl, 2-tridecyl and 2-tetradecyl homologues) (Rutaceae).
Bopindolol is only found in individuals that have used or taken this drug. It is a beta blocker. It is an ester which acts as a prodrug for 'pindolol':http://drugbank.ca/drugs/DB00960. Bopindolol (as 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.
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).
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).
Hexaglutamyl folate is a naturally occurring form of folic acid. The bioavailability of dietary folate may be hampered by the need of the glutamate moieties to be deconjugated before absorption. Folate deficiency in humans leads to anemia, neural tube defects and, possibly, chronic diseases such as cardiovascular disease, colon cancer, and neurocognitive dysfunction. Folate status is ascertained not only by the intake of folate but also by its bioavailability. Bioavailability is defined as the proportion of ingested folate that is absorbed and available for metabolic processes and storage. In humans, the bioavailability of folate from the diet is assumed to be {approx}50%, whereas the bioavailability of synthetic folic acid used in supplements and as a food fortificant is estimated to range from 76% to 97%. (PMID: 17093166). Patients with pernicious anemia in relapse and postgastrectomy macrocytic anemia cannot readily utilize for hematopoiesis a naturally occurring conjugate of pteroylglutamic acid although they respond promptly to administration of the free vitamin. This effect varies in different patients. Inability to utilize the conjugated vitamin appears to depend at least in part upon a conjugase-inhibiting substance present in natural sources of conjugate. (PMID: 1082804).
o-Tyrosine is a normal human metabolite. Its presence is possible due to the hydroxylation of l-phenylalanine by hydroxyl radical (*OH), and is proposed as an hydroxy radical biomarker of oxidative damage to proteins. o-Tyrosine might also be included in the diet and absorbed. It has been associated with disease such as Kwashiorkor, a severe form of protein-energy malnutrition. However, many publications mention that the results are inconclusive, and o-tyrosine is not selectively altered by antioxidant intervention, exercise training or age. (PMID:14670743, 10969271, 9887186).
Dibromochloromethane belongs to the family of Organochlorides. These are organic compounds containing a chlorine atom
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).
1-Heptanol is found in alcoholic beverages. 1-Heptanol is found in a few essential oils, e.g. Rosa rugosa. Also present in roasted peanut, roasted filbert, plum brandy, rice bran, cooked rice, peated malt, Bourbon vanilla, banana, morello cherry, orange, guava fruit, pineapple and plum. 1-Heptanol is a flavouring ingredient.1-Heptanol is an alcohol with a seven carbon chain and the structural formula of CH3(CH2)6OH. It is a clear colorless liquid that is very slightly soluble in water, but miscible with ether and ethanol
Arginylarginine is a dipeptide composed of two arginine 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.
Heptanoic acid, or C7:0 also known as enanthic acid or heptylic acid, belongs to the class of organic compounds known as medium-chain fatty acids. Medium-chain fatty acids (MCFA) are fatty acids with aliphatic tails of 6 to 12 carbons, which can form medium-chain triglycerides Heptanoic acid is an oily liquid with an unpleasant, rancid odor. It contributes to the odor of some rancid oils. It is slightly soluble in water, but very soluble in ethanol and ether. Its name derives from the Latin oenanthe which is in turn derived from the Ancient Greek oinos "wine" and anthos "blossom." Heptanoic acid is used in the preparation of esters, such as ethyl enanthate, which are used in fragrances and as artificial flavors.  The triglyceride ester of heptanoic acid is the triheptanoin, which is used in certain medical conditions as a nutritional supplement.
2,3,6-Trimethylphenol is a flavouring ingredien
<p>Phosphatidylinositol (3,4,5)-trisphosphate (PtdIns(3,4,5)P3) commonly abbreviated to PIP3 is the product of the class I phosphoinositide 3-kinases (PI 3-kinases) activity on phosphatidylinositol (4,5)-bisphosphate. PtdIns(3,4,5)P3 is dephophosphorylated by the phosphatase, PTEN on the 3 position and by SHIPs (SH2-containing inositol phosphatase) on the 5' position of the inositol ring.</p>. <p>The PH domain in a number of proteins binds to PtdIns(3,4,5)P3. Such proteins include Akt/PKB, PDK1, Btk1 and ARNO. The generation of PtdIns(3,4,5)P3 at the plasma membrane upon the activation of class I PI 3-kinases causes these proteins to translocate to the plasma membrane and accordingly affects their activity. The PH domain allows binding between PtdIns(3,4,5)P3 and G-protein coupled receptor kinases (GRKs). This enhances the binding of the GRK to the plasma membrane. (Wikipedia)</p>.
Cefpirome is a fourth-generation cephalosporin. Trade names include Cefrom, Keiten, Broact, Cefir. Cefpirome is considered highly active against Gram-negative bacteria, including Pseudomonas aeruginosa, and Gram-positive bacteria. It is marketed under the brand name of CEFROM by sanofi aventis group india.
Ebastine (trade names Evastin, Kestine, Ebastel, Aleva) is a non-sedating H1 antihistamine. It does not penetrate the blood–brain barrier and thus allows an effective block of the H1 receptor in peripheral tissue without a central side effect, i. e not causing sedation or drowsiness. The basic patent for ebastine in Europe is EP-B-134124. It is often provided in micronised form, due to poor water solubility. (Wikipedia) CYP2J2, an arachidonic acid epoxygenase, is recognized for its role in the first-pass metabolism of astemizole and ebastine. (PMID: 22328583)
1-Octene is used as a food additive [EAFUS] ("EAFUS: Everything Added to Food in the United States. [http://www.eafus.com/]")
Thymol methyl ether is found in citrus. Naturally occurring, e.g. in oil of sea fennel (Crithmum maritimum) and Citrus specie
Isoastragalin is found in fats and oils. Isoastragalin is isolated from Gossypium hirsutum (cotton) and other plant species.
3,3',7-Trihydroxy-4'-methoxyflavone is isolated from quebracho heartwoo
Isorhamnetin is the methylated metabolite of quercetin. Quercetin is an important dietary flavonoid with in vitro antioxidant activity. However, it is found in human plasma as conjugates with glucuronic acid, sulfate or methyl groups, with no significant amounts of free quercetin present. Isorhamnetin prevents endothelial cell injuries from oxidized LDL via inhibition of lectin-like ox-LDL receptor-1 upregulation, interference of ox-LDL-mediated intracellular signaling pathway (p38MAPK activation, NF-kappaB nuclear translocation, eNOS expression) and the antioxidant activity of isorhamnetin. Isorhamnetin prevents endothelial dysfunction, superoxide production, and overexpression of p47phox induced by angiotensin II. Isorhamnetin appears to be a potent drug against esophageal cancer due to its in vitro potential to not only inhibit proliferation but also induce apoptosis of Eca-109 cells. (PMID: 15493462, 17368593, 17374653, 16963021).
Nordihydrocodeine belongs to the family of Morphinans. These are polycyclic compounds with a four-ring skeleton with three condensed six-member rings forming a partially hydrogenated phenanthrene moiety, one of which is aromatic while the two others are alicyclic.
Dihydroisomorphine-3-glucuronide is a metabolite of hydromorphone. Hydromorphone, a more common synonym for dihydromorphinone, commonly a hydrochloride (brand names Palladone, Dilaudid, and numerous others) is a very potent centrally acting analgesic drug of the opioid class. It is a derivative of morphine, to be specific, a hydrogenated ketone thereof and, therefore, a semi-synthetic drug. It is, in medical terms, an opioid analgesic and, in legal terms, a narcotic. (Wikipedia)
Repaglinide is an oral antihyperglycemic agent used for the treatment of non-insulin-dependent diabetes mellitus (NIDDM). It belongs to the meglitinide class of short-acting insulin secretagogues, which act by binding to cells of the pancreas to stimulate insulin release. Repaglinide induces an early insulin response to meals decreasing postprandial blood glucose levels. It should only be taken with meals and meal-time doses should be skipped with any skipped meal. Approximately one month of therapy is required before a decrease in fasting blood glucose is seen. Meglitnides may have a neutral effect on weight or cause a slight increase in weight. The average weight gain caused by meglitinides appears to be lower than that caused by sulfonylureas and insulin and appears to occur only in those naive to oral antidiabetic agents. Due to their mechanism of action, meglitinides may cause hypoglycemia although the risk is thought to be lower than that of sulfonylureas since their action is dependent on the presence of glucose. In addition to reducing postprandial and fasting blood glucose, meglitnides have been shown to decrease glycosylated hemoglobin (HbA1c) levels, which are reflective of the last 8-10 weeks of glucose control. Meglitinides appear to be more effective at lowering postprandial blood glucose than metformin, sulfonylureas and thiazolidinediones. Repaglinide is extensively metabolized in the liver and excreted in bile. Repaglinide metabolites do not possess appreciable hypoglycemic activity. Approximately 90% of a single orally administered dose is eliminated in feces and 8% in urine.
Leanness enhancer for pigs. Approved for use in the USA
1-Hexanol arabinosylglucoside is found in pomes. 1-Hexanol arabinosylglucoside is a constituent of apples (Malus sylvestris)
Tianeptine (INN) was discovered by The French Society of Medical Research in the 1960s. Under the trade-names (Stablon, Coaxil, Tatinol) it is a drug used for treating major depressive episodes (mild, moderate, or severe). It has structural similarities to the tricyclic antidepressants, but it has different pharmacological properties. Tianeptine is a selective serotonin reuptake enhancer (SSRE), opposite to the action of SSRIs. One review points to the cancellative effects of tianeptine and fluoxetine coadministration on serotonin reuptake. Another suggests that long-term administration of tianeptine has no effect on serotonin pathways. Tianeptine enhances the extracellular concentration of dopamine in the nucleus accumbens and modulates the D2 and D3 dopamine receptors, but this effect is modest and almost certainly indirect. There is also action on the NMDA and AMPA receptors. Recent reviews point to this pathway as a hypothesized mechanism of action, based on tianeptine's effect of reversing impaired neuroplasticity associated with stress.
Cefmenoxime is only found in individuals that have used or taken this drug. It is a third-generation cephalosporin antibiotic. [Wikipedia]The bactericidal activity of cefmenoxime results from the inhibition of cell wall synthesis via affinity for penicillin-binding proteins (PBPs). Cefmenoxime is stable in the presence of a variety of b-lactamases, including penicillinases and some cephalosporinases.
Carbenicillin is only found in individuals that have used or taken this drug. It is a broad-spectrum semisynthetic penicillin derivative used parenterally. It is susceptible to gastric juice and penicillinase and may damage platelet function. [PubChem]Free carbenicillin is the predominant pharmacologically active fraction of the salt. Carbenicillin exerts its antibacterial activity by interference with final cell wall synthesis of susceptible bacteria. Penicillins acylate the penicillin-sensitive transpeptidase C-terminal domain by opening the lactam ring. This inactivation of the enzyme prevents the formation of a cross-link of two linear peptidoglycan strands, inhibiting 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 carbenicillin interferes with an autolysin inhibitor.
5-Acetylamino-6-amino-3-methyluracil (AAMU) is one of caffeine major metabolites. Analysis of caffeine and its metabolites is of interest with respect to caffeine exposure, for kinetic and metabolism studies and for opportunistic in vivo estimation of drug metabolizing enzyme activity in humans and animals. Urinary caffeine metabolite ratios are used in humans to assess the activity of cytochrome P450 1A2 (CYP1A2), xanthine oxidase and N-acetyltransferase 2 (NAT2), which are involved in the activation or detoxification of various xenobiotic compounds, including carcinogens. Investigating the activity of these enzymes is of clinical relevance for assessing intra- and inter-individual differences in NAT2- and CYP1A2-mediated drug metabolism, and for evaluating the risk of developing specific exposure-related diseases. (PMID: 3506820, 15685651, 12534641).
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.
N,N'-Diacetylhydrazine is a metabolite of isoniazid. Isoniazid (Laniazid, Nydrazid), also known as isonicotinylhydrazine (INH), is an organic compound that is the first-line medication in prevention and treatment of tuberculosis. (Wikipedia)
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).
Isoquinoline is a flavouring agent Being an analog of pyridine, isoquinoline is a weak base, with a pKb of 8.6. It protonates to form salts upon treatment with strong acids, such as HCl. It forms adducts with Lewis acids, such as BF3. Isoquinoline is a colorless hygroscopic liquid at room temperature with a penetrating, unpleasant odor. Impure samples can appear brownish, as is typical for nitrogen heterocycles. It crystallizes platelets that have a low solubility in water but dissolve well in ethanol, acetone, diethyl ether, carbon disulfide, and other common organic solvents. It is also soluble in dilute acids as the protonated derivative. Isoquinoline is a heterocyclic aromatic organic compound. It is a structural isomer of quinoline. Isoquinoline and quinoline are benzopyridines, which are composed of a benzene ring fused to a pyridine ring. In a broader sense, the term isoquinoline is used to make reference to isoquinoline derivatives. 1-Benzylisoquinoline is the structural backbone in naturally occurring alkaloids including papaverine and morphine. The isoquinoline ring in these natural compound derives from the aromatic amino acid tyrosine
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.
As it is an organic compound, hypothiocyanite occurs naturally in the antimicrobial immune system of the human respiratory tract in a redox reaction catalyzed by the enzyme lactoperoxidase. It has been researched extensively for its capabilities as an alternative antibiotic as it is harmless to human body cells while being cytotoxic to bacteria. Of late, the exact processes for making hypothiocyanite have been patented as such an effective antimicrobial has many commercial applications. Whether or not this antimicrobial compound comprises the entirety of the immune system of the respiratory tract remains to be seen. Hypothiocyanite is the anion [OSCN]- and the conjugate base of hypothiocyanous acid. It is an organic compound part of the thiocyanates as it contains the functional group SCN. It is formed when an oxygen is singly bonded to the thiocyanate group. Hypothiocyanous acid (HOSCN) is a fairly weak acid as its acid dissociation constant is 5.3.
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).
Zinc is an essential element, necessary for sustaining all life. It is a trace element in the diet, forming an essential part of many enzymes, and playing an important role in protein synthesis and in cell division. Physiologically, it exists as an ion in the body. It is estimated that 3000 of the hundreds of thousands of proteins in the human body contain zinc prosthetic groups. In addition, there are over a dozen cell types in the human body that secrete zinc ions, and the roles of these secreted zinc signals in medicine and health are now being actively studied. Intriguingly, brain cells in the mammalian forebrain are one type of cell that secretes zinc, along with its other neuronal messenger substances. Cells in the salivary gland, prostate, immune system, and intestine are other types that secrete zinc. Obtaining a sufficient zinc intake during pregnancy and in young children is a problem, especially among those who cannot afford a good and varied diet. Zinc deficiency is associated with anemia, short stature, hypogonadism, impaired wound healing, and geophagia. Brain development is stunted by zinc deficiency in utero and in youth. Zinc is an activator of certain enzymes, such as carbonic anhydrase. Carbonic anhydrase is important in the transport of carbon dioxide in vertebrate blood. Even though zinc is an essential requirement for a healthy body, too much zinc can be harmful. Excessive absorption of zinc can also suppress copper and iron absorption. The free zinc ion in solution is highly toxic to plants, invertebrates, and even vertebrate fish. The Free Ion Activity Model (FIAM) is well-established in the literature and shows that just micromolar amounts of the free ion kill some organisms.
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.
omega-hydroxyfinasteride is a metabolite of finasteride. Finasteride (brand names Proscar and Propecia by Merck, among other generic names) is a synthetic 5α-reductase inhibitor, an inhibitor of the enzyme that converts testosterone to dihydrotestosterone (DHT). Finasteride is approved for the treatment of benign prostatic hyperplasia (BPH) and male pattern baldness (MPB). (Wikipedia)
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.
L-homoarginine, also known as N6-(aminoiminomethyl)-L-lysine or N6-amidino-L-lysine, 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. More specifically, L-homoarginine is a naturally occurring, non-proteinogenic, cationic amino acid. It is formed in the liver in a reaction catalyzed by L-arginine:glycine amidinotransferase (AGAT) when transferring the amidino group from arginine to lysine. It is an alternative substrate for nitric oxide (NO) synthase. L-homoarginine increases the availability of NO and thereby affects endothelial function. High homoarginine levels may exert positive actions that are relevant to cardiovascular health, including enhanced endothelial function, inhibition of platelet aggregation and stimulation of insulin secretion (PMID: 30866658). Recent studies have demonstrated that low serum homoarginine levels are a strong predictor of cardiovascular mortality (PMID: 24583919). L-homoarginine is a substrate of the human cationic amino acid CAT1 [solute carrier family 7 (SLC7A1)], CAT2A (SLC7A2A) or CAT2B (SLC7A2B) (PMID: 28684763). According to published human metabolomic data, L-homoarginine can be found primarily in blood, cerebrospinal fluid (CSF), and urine, as well as in human intestinal and testes tissues. Moreover, L-homoarginine has been found to be associated with liver cirrhosis and the genetic disorder, hyperargininemia. Homoarginine is an organ-specific uncompetitive inhibitor of human liver and bone alkaline phosphohydrolase (PMID: 5063678).
. 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.
Glucobrassicin is found in brassicas. Glucobrassicin is a constituent of Brassica and Raphanus species, e.g. rape (Brassica napus var. napus) and Brussels sprouts (Brassica oleracea var. gemmifera)
3-Indoleacetonitrile is a phytoalexin. Phytoalexins are antibiotics produced by plants that are under attack. Phytoalexins tend to fall into several classes including terpenoids, glycosteroids, and alkaloids; however, researchers often find it convenient to extend the definition to include all phytochemicals that are part of the plant's defensive arsenal. Phytoalexins produced in plants act as toxins to the attacking organism. They may puncture the cell wall, delay maturation, disrupt metabolism, or prevent the reproduction of the pathogen in question. However, phytoalexins are often targeted to specific predators; a plant that has anti-insect phytoalexins may not have the ability to repel a fungal attack. 3-Indoleacetonitrile is common in cruciferous vegetables such as cabbage, cauliflower, broccoli, and Brussels sprouts. Dietary indoles in cruciferous vegetables induce cytochrome P450 enzymes and have prevented tumours in various animal models. Consumption of Brassica vegetables is associated with a reduced risk of cancer of the alimentary tract in animal models and human populations (PMID:15612779, 15884814, 2342128, 3014947, 3880668, 6334634, 6419397, 6426808, 6584878, 6725517, 6838646, 7123561).
5,6-Dihydro-5-fluorouracil 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)
Protogonyautoxin 3 is found in mollusks. Protogonyautoxin 3 is from Gonyaulax and Protogonyaulax species.
Metipranolol is only found in individuals that have used or taken this drug. It is a beta-adrenergic antagonist effective for both beta-1 and beta-2 receptors. It is used as an antiarrhythmic, antihypertensive, and antiglaucoma agent. [PubChem]Although it is known that metipranolol binds the beta1 and beta2 adrenergic receptors, the mechanism of metipranolol's action is not known. It has no significant intrinsic sympathomimetic activity, and has only weak local anesthetic (membrane-stabilizing) and myocardial depressant activity. It appears that the ophthalmic beta-adrenergic blocking agents reduce aqueous humor production, as demonstrated by tonography and fluorophotometry. A slight increase in aqueous humor outflow may be an additional mechanism.
Isodomoic acid F is found in mollusks. Isodomoic acid F is isolated from mussels.
demethylmaprotiline is a metabolite of maprotiline. Maprotiline (sold as Deprilept, Ludiomil, Psymion) is a tetracyclic antidepressant (TeCA). However, Maprotiline's fourth ring is spurious, as formed by a bridge across the central tricyclic ring. It is a strong norepinephrine reuptake inhibitor with only weak effects on serotonin and dopamine reuptake. (Wikipedia)
N-acetyl-s-(n-methylcarbamoyl)cysteine 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 his terminal nitrogen atom.
Dimethylphosphate, also known as dimethyl hydrogen phosphate, is classified as a member of the Dialkyl phosphates. Dialkyl phosphates are organic compounds containing a phosphate group that is linked to exactly two alkyl chain. Dimethylphosphate is considered to be soluble (in water) and acidic. (ChemoSummarizer)
4alpha-Methylzymosterol belongs to the class of organic compounds known as cholesterols and derivatives. Cholesterols and derivatives are compounds containing a 3-hydroxylated cholestane core. Thus, 4alpha-methylzymosterol is considered to be a sterol lipid molecule. 4alpha-Methylzymosterol is a very hydrophobic molecule, practically insoluble (in water), and relatively neutral. Outside of the human body, 4alpha-methylzymosterol has been detected, but not quantified in, several different foods, such as redcurrants, sunflowers, robusta coffees, white mustards, and sesbania flowers. This could make 4alpha-methylzymosterol a potential biomarker for the consumption of these foods. 4alpha-Methylzymosterol is an intermediate in the biosynthesis of steroids. It is the seventh to last step in the synthesis of vitamin D2 and is converted from 3-keto-4-methylzymosterol via the enzyme 3-keto steroid reductase (EC 1.1.1.270). It is then converted into zymosterol.
8,11,14-Eicosatrienoic acid is a 20-carbon-chain omega-6 fatty acid, unsaturated at positions 8, 11, and 14. It differs from arachidonic acid (5,8,11,14-eicosatetraenoic acid) only at position 5. 8,11,14-Eicosatrienoic acid is also known as Dihomo-gamma-linolenic acid (DGLA). In physiological literature, it is given the name 20:3(n-6). DGLA is the elongation product of the 18 carbon gamma-linolenic acid (GLA). DGLA can be converted into prostaglandin E1 (PGE1). PGE1 inhibits platelet aggregation and also exerts a vasodilatory effect. DGLA competes with arachadonic acid for COX and lipoxygenase, inhibiting the production of arachadonic acid's eicosanoids.
Bovinic acid is a conjugated linoleic acid, present in human adipose tissue; the amount of bovinic acid in humans is significantly related to milk fat intake. Conjugated linoleic acids (CLAs) are a group of naturally occurring fatty acids present mainly in fats from ruminants. Milk contains over 20 isomers of CLA but the predominant one is cis-9,trans-11-CLA (bovinic acid). Biomedical studies with animal models have shown that this isomer has anticarcinogenic and anti-atherogenic activities. Bovinic acid is produced as an intermediate in the rumen biohydrogenation of linoleic acid but not of linolenic acid. However, it is only a transient intermediate, and the major source of milk fat CLA is from endogenous synthesis (PMID: 10393134, 15736916).
Endalin belongs to the family of Pyrimidine Nucleosides and Analogues. These are compounds comprising a pyrimidine base attached to a sugar.
Cycloserine is only found in individuals that have used or taken this drug. It is an antibiotic substance produced by Streptomyces garyphalus. [PubChem]Cycloserine is an analog of the amino acid D-alanine. It interferes with an early step in bacterial cell wall synthesis in the cytoplasm by competitive inhibition of two enzymes, L-alanine racemase, which forms D-alanine from L-alanine, and D-alanylalanine synthetase, which incorporates D-alanine into the pentapeptide necessary for peptidoglycan formation and bacterial cell wall synthesis.
Boiler water additive.
1,3-Butanediol, also known as b-butylene glycol or BD, belongs to the class of organic compounds known as secondary alcohols. Secondary alcohols are compounds containing a secondary alcohol functional group, with the general structure HOC(R)(R') (R,R'=alkyl, aryl). 1,3-Butanediol is a bitter and odorless tasting compound. 1,3-Butanediol has been detected, but not quantified, in several different foods, such as green bell peppers, orange bell peppers, pepper (c. annuum), red bell peppers, and yellow bell peppers. This could make 1,3-butanediol a potential biomarker for the consumption of these foods. A butanediol compound having two hydroxy groups in the 1- and 3-positions.
Pitheduloside G is found in fruits. Pitheduloside G is a constituent of Pithecellobium dulce (Manila tamarind)
Elatoside E is found in green vegetables. Elatoside E is a constituent of Aralia elata (Japanese angelica tree).
Fumitremorgin C is produced by Aspergillus fumigatus and Neosartorya fischeri.
Miglitol is an oral anti-diabetic drug that acts by inhibiting the ability of the patient to breakdown complex carbohydrates into glucose. It is primarily used in diabetes mellitus type 2 for establishing greater glycemic control by preventing the digestion of carbohydrates (such as disaccharides, oligosaccharides, and polysaccharides) into monosaccharides which can be absorbed by the body. Miglitol inhibits glycoside hydrolase enzymes called alpha-glucosidases. Since miglitol works by preventing digestion of carbohydrates, it lowers the degree of postprandial hyperglycemia. It must be taken at the start of main meals to have maximal effect. Its effect will depend on the amount of non-monosaccharide carbohydrates in a person's diet. In contrast to acarbose (another alpha-glucosidase inhibitor), miglitol is systemically absorbed; however, it is not metabolized and is excreted by the kidneys.
alpha-Linolenic acid (ALA) is a polyunsaturated fatty acid (PUFA). It is a member of the group of essential fatty acids called omega-3 fatty acids. alpha-Linolenic acid, in particular, is not synthesized by mammals and therefore is an essential dietary requirement for all mammals. Certain nuts (English walnuts) and vegetable oils (canola, soybean, flaxseed/linseed, olive) are particularly rich in alpha-linolenic acid. Omega-3 fatty acids get their name based on the location of one of their first double bond. In all omega-3 fatty acids, the first double bond is located between the third and fourth carbon atom counting from the methyl end of the fatty acid (n-3). Although humans and other mammals can synthesize saturated and some monounsaturated fatty acids from carbon groups in carbohydrates and proteins, they lack the enzymes necessary to insert a cis double bond at the n-6 or the n-3 position of a fatty acid. Omega-3 fatty acids like alpha-linolenic acid are important structural components of cell membranes. When incorporated into phospholipids, they affect cell membrane properties such as fluidity, flexibility, permeability, and the activity of membrane-bound enzymes. Omega-3 fatty acids can modulate the expression of a number of genes, including those involved with fatty acid metabolism and inflammation. alpha-Linolenic acid and other omega-3 fatty acids may regulate gene expression by interacting with specific transcription factors, including peroxisome proliferator-activated receptors (PPARs) and liver X receptors (LXRs). alpha-Linolenic acid is found to be associated with isovaleric acidemia, which is an inborn error of metabolism.
endo-1,4-beta-Xylanase is used in baked goods and brewing to treat whole grain, grain mashes and doughs to reduce viscosity for processing. Hydrolyses 1,4-b-D-xylosidic linkages in xylans.
Cymene, or p-cymene also known as p-cymol or isopropyltoluene, is a naturally occurring aromatic organic compound. It is classified as a hydrocarbon related to a monoterpene. Its structure consists of a benzene ring para-substituted with a methyl group and an isopropyl group. It is insoluble in water, but miscible with ethanol and ether. Cymene is a constituent of a number of essential oils, most commonly the oil of cumin and thyme. There are two less common geometric isomers. o-Cymene, in which the alkyl groups are ortho-substituted, and m-cymene, in which they are meta-substituted. p-Cymene is the only natural isomer. Cymene is a common ligand for ruthenium.
Gamma-terpinene is one of four isomeric monoterpenes (the other three being alpha terpinene, beta terpinene and delta terpinene). It is a naturally occurring terpinene and has been isolated from a variety of plant sources. It has the highest boiling point of the four known terpinene isomers. It is a major component of essential oils made from citrus fruits and has a strong antioxidant activity. It has a lemon-like or lime-like odor and is widely used in food, flavours, soaps, cosmetics, pharmaceutical, tabacco, confectionery and perfume industries (http://www.gyanflavoursexport.com). The other isomers of gamma-terpinene, such as alpha-terpinene and delta-terpinene, have been isolated from cardamom and marjoram oils while beta terpinene appears to have no natural source.
Tertatolol (Artex, Artexal, Prenalex) is a medication in the class of beta blockers, used in the treatment of high blood pressure. It was discovered by the French pharmaceutical company Servier and is marketed in Europe.
It is used in foods as a binder, emulsifier and anticaking agent
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.
Panaxytriol is found in tea. Panaxytriol is found in ginsen
(±)-Hydroxycitronellol is a flavouring ingredien
(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
Roxarsone is used to control enteric infections in chicken and to improve growth and feed efficiency. Roxarsone is a fda approved additive for chicken, turkey and swine feeds.
N-acetyl-5-aminosalicylic acid is a metabolite of mesalazine. Mesalazine, also known as mesalamine or 5-aminosalicylic acid (5-ASA), is an anti-inflammatory drug used to treat inflammatory bowel disease, such as ulcerative colitis and mild-to-moderate Crohn's disease. Mesalazine is a bowel-specific aminosalicylate drug that acts locally in the gut and has its predominant actions there, thereby having few systemic side effects. (Wikipedia)
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).
Tetrahydrobiopterin (BH4) is essential for catalyzing the conversion of phenylalanine into tyrosine by phenylalanine hydroxylase. During this physiological reaction, the oxidation of BH4 creates 4a-hydroxytetrahydropterin (CAS: 70110-58-6) intermediates and hydrogen peroxide is formed. The hydrogen peroxide and the hydroxytetrahydropterin can both be derived from alternate breakdown routes of a common precursor, the corresponding 4a-hydroperoxytetrahydropterin (PMID: 8323303).
Colupulone is found in alcoholic beverages. Colupulone is a constituent of the resin of English hops
Lc3Cer, also known as NLC(4)Cer or Paragloboside, is classified as a member of the Glycosyl-N-acylsphingosines. Glycosyl-N-acylsphingosines are compounds containing a sphingosine linked to a simple glucosyl moiety. Lc3Cer is considered to be practically insoluble (in water) and acidic
Arginylvaline is a dipeptide composed of arginine 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.
noracymethadol is a metabolite of levomethadyl acetate. Levacetylmethadol, levomethadyl acetate (USAN), Orlaam (trade name) or levo-α-acetylmethadol (LAAM) is a synthetic opioid similar in structure to methadone. It has a long duration of action due to its active metabolites. (Wikipedia)
dinor-Levomethadyl acetate is a metabolite of levomethadyl acetate. Levacetylmethadol, levomethadyl acetate, Orlaam (trade name) or levo-α-acetylmethadol (LAAM) is a synthetic opioid similar in structure to methadone. It has a long duration of action due to its active metabolites. (Wikipedia)
9-(beta-D-Ribofuranosyl)-(Z)-Zeatin is found in alfalfa. Zeatin is a plant hormone derived from the purine adenine. It is a member of the plant growth hormone family known as cytokinins. Zeatin was first discovered in immature corn kernels from the genus Zea. Zeatin and derivatives were discovered to be the primary active ingredient in coconut milk, which has long been known to actively induce plant growth. As in the case of kinetin, zeatin has also been reported to have several in vitro anti-aging effects on human skin fibroblasts.(Wikipedia).
Guanadrel is a postganglionic sympathetic adrenergic antagonist that is administered orally to treat hypertension (high blood pressure). It was used in the form of its sulfate (trade name: Hylorel) but has been largely superseded by other antihypertensive agents due to its unpleasant side effect of orthostatic hypotension (i.e. dizziness when standing) (PMID: 6143629). Guanadrel both prevents noradrenaline (norepinephrine) release and depletes noradrenaline stores which effectively creates a peripheral sympathetic blockade. This serves to reduce vasoconstriction which subsequently lowers blood pressure (PMID: 3896742).
Cob(I)alamin is the substrate of the enzyme ATP:cob(I)alamin adenosyltransferase (EC 2.5.1.17), that converts reduced cob(I)alamin to the adenosylcobalamin co-factor required for the functional activity of methylmalonyl-CoA mutase (EC 5.4.99.2). Mutations in the human MMAB gene result in a block in adenosylcobalamin synthesis and are responsible for the cblB complementation group of inherited vitamin B12 disorders, such as cobalamin malabsorption, which is an inborn error of metabolism. Vitamin B12 (cobalamin) is a complex cobalt-containing molecule that is essential to human health. It is synthesized in bacteria where it catalyzes numerous methyl transfer and intramolecular rearrangement reactions. In mammals, it is the co-factor of only two enzymes: methionine synthase, which catalyzes the transfer of a methyl group from methyltetrahydrofolate to homocysteine to form methionine, and methylmalonyl-CoA mutase, which catalyzes the rearrangement of methylmalonyl-CoA to form succinyl-CoA. For both enzymes, the vitamin must be modified through intracellular metabolism to co-factor forms: methylcobalamin (MeCbl)1 for methionine synthase and adenosylcobalamin (AdoCbl) for methylmalonyl-CoA mutase (PMID: 16439175).
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).
Mammea B/AB is found in fruits. Mammea B/AB is a constituent of Mammea americana (mamey) seeds
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.
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.
2-Hydroxyclomipramine 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)
Dyspropterin, an intermediate formed from dihydroneopterin triphosphate in the biosynthetic pathway of tetrahydrobiopterin.
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.
2-Phenylbutyric acid, also known as alpha-phenylbutyrate or alpha-ethyl-alpha-toluate, belongs to the class of organic compounds known as phenylpropanes. Phenylpropanes are organic compounds containing a phenylpropane moiety. 2-Phenylbutyric acid is slightly soluble (in water) and a weakly acidic compound (based on its pKa). 2-Phenylbutyric acid can be biosynthesized from butyric acid. 2-Phenylbutyric acid is used as an anticholesteremic.
Homolanthionine is formed from homocysteine and homoserine by a condensation analogous to that normally leading to cystathionine. The only other known occurrence of homolanthionine in nature is in a methionine-requiring mutant strain of Escherichia coli. Patients with homocystinuria excrete small amounts of L-homolanthionine in their urine.
N-Caffeoyltryptophan is found in coffee and coffee products. N-Caffeoyltryptophan is a constituent of green coffee beans
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.
Adrenic acid, also known as 7,10,13,16-docosatetraenoic acid or adrenate, 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. Adrenic acid is practically insoluble (in water) and a weakly acidic compound (based on its pKa). Adrenic acid can be found in blood and in human myelin tissue. Within the cell, adrenic acid is primarily located in the cytoplasm, in the membrane (predicted from logP), and in the peroxisome. It can also be found in the extracellular space. In humans, adrenic acid is involved in alpha-linolenic acid and linoleic acid metabolism. Docosatetraenoic acid designates any straight chain 22:4 fatty acid. In particular, all-cis-7,10,13,16-docosatetraenoic acid is an ω-6 fatty acid with the trivial name adrenic acid (AdA). This is a naturally occurring polyunsaturated fatty acid formed through a 2-carbon chain elongation of arachidonic acid. It is one of the most abundant fatty acids in the early human brain. This unsaturated fatty acid is also metabolized by cells into biologically active products, such as dihomoprostaglandins and dihomo-epoxyeicosatrienoic acids (dihomo-EETs) (Wikipedia). Adrenic acid, which is a prostacyclin inhibitor, appears to be a potential prothrombotic agent (PMID: 1642692).
Nutrient supplement
Suprofen is only found in individuals that have used or taken this drug. It is an ibuprofen-type anti-inflammatory analgesic and antipyretic. It inhibits prostaglandin synthesis and has been proposed as an anti-arthritic. [PubChem]Suprofen binds to the cyclooxygenase-1 (COX-1) and cyclooxygenase-2 (COX-2) isoenzymes, preventing the synthesis of prostaglandins and reducing the inflammatory response. Cyclooxygenase catalyses the formation of prostaglandins and thromboxane from arachidonic acid (itself derived from the cellular phospholipid bilayer by phospholipase A<sub>2</sub>). Prostaglandins act (among other things) as messenger molecules in the process of inflammation. The overall result is a reduction in pain and inflammation in the eyes and the prevention of pupil constriction during surgery. Normally trauma to the anterior segment of the eye (especially the iris) increases endogenous prostaglandin synthesis which leads to constriction of the iris sphincter.
N,N'-Diacetylhydrazine is a metabolite of isoniazid. Isoniazid (Laniazid, Nydrazid), also known as isonicotinylhydrazine (INH), is an organic compound that is the first-line medication in prevention and treatment of tuberculosis. (Wikipedia)
2,4-dimethylquinoline belongs to quinolines and derivatives class of compounds. Those are compounds containing a quinoline moiety, which consists of a benzene ring fused to a pyrimidine ring to form benzo[b]azabenzene. 2,4-dimethylquinoline is practically insoluble (in water) and a very strong basic compound (based on its pKa). 2,4-dimethylquinoline can be found in tea, which makes 2,4-dimethylquinoline a potential biomarker for the consumption of this food product.
Indomethacin is a non-steroidal antiinflammatory agent (NSAIA) with antiinflammatory, analgesic and antipyretic activity. Its pharmacological effect is thought to be mediated through inhibition of the enzyme cyclooxygenase (COX), the enzyme responsible for catalyzes the rate-limiting step in prostaglandin synthesis via the arachidonic acid pathway.
Pipemidic acid is a member of the pyridopyrimidine class of antibacterials, which display some overlap in mechanism of action with analogous pyridone-containing quinolones.
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-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).
3,5-Diiodothyronine, also known as 3,5-T2, belongs to the class of organic compounds known as phenylalanines and derivatives. Phenylalanine and derivatives 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. It is also a member of the class of compounds known as iodothyronines. Iodothyronines are phenolic amino acids with iodine substituents. 3,5-Diiodothyronine is a metabolite of the two main thyroid hormones T3 and T4 (thyroxine and triiodo-L-thyronine). It is a biologically active iodothyronine with mitochondria and bioenergetic mechanisms being the major targets of 3,5-T2. Nanomolar concentrations of 3,5-T2 significantly increases cytochrome oxidase (COX) activity (PMID: 30090086). It increases COX activity by preventing the interaction of adenosine triphosphate (ATP) as an allosteric inhibitor. At 1 pM concentration, 3,5-T2 stimulates oxygen consumption more rapidly than thyroxine (T3). A case report involving two human participants revealed that administration of 3,5-T2 to humans (1‚Äì5 ug/kg BW) rapidly (after 4‚Äì6 h) increased resting metabolic rate. Chronic 3,5-T2 administration (28 days, approximately 5 ug/kg BW) increased resting metabolic rate by approximately 15% and decreased body weight by approximately 4 kg in both participants (PMID: 22217997). 3,5-T2 stimulates the thyroid receptor (TR)-beta receptor for thyroid hormones and thus increases energy expenditure. It has agonistic (thyromimetic) effects on myocardial tissue and on the pituitary, which results in 3,5-T2 suppressing thyroid stimulating hormone release.
2,5-Dimethylpyrazine, also known as fema 3272 or pyrazine,2,5-dimethyl, 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. 2,5-Dimethylpyrazine is a cocoa, grass, and medicinal tasting compound. 2,5-Dimethylpyrazine is found, on average, in the highest concentration within kohlrabis. 2,5-Dimethylpyrazine has also been detected, but not quantified, in several different foods, such as green vegetables, soy beans, asparagus, tortilla chips, and fenugreeks. This could make 2,5-dimethylpyrazine a potential biomarker for the consumption of these foods. It occurs naturally in baked potato, black or green tea, crispbread, French fries, malt, peated malt, raw asparagus, roasted barley, roasted filberts or pecans, squid, wheat bread, wild rice (Zizania aquatica), and wort. Alkylpyrazines are chemical compounds based on pyrazine with different substitution patterns. Some alkylpyrazines are naturally occurring highly aromatic substances which often have a very low odor threshold and contribute to the taste and aroma of various foods including coffee and wines. Alkylpyrazines are also formed during the cooking of some foods via Maillard reactions.
Rotigotine (Neupro) is a non-ergoline dopamine agonist indicated for the treatment of Parkinson's disease (PD) and restless legs syndrome (RLS) in Europe and the United States. It is formulated as a once-daily transdermal patch which provides a slow and constant supply of the drug over the course of 24 hours. Like other dopamine agonists, rotigotine has been shown to possess antidepressant effects and may be useful in the treatment of depression as well. Rotigotine was developed by Aderis Pharmaceuticals. In 1998, Aderis licensed worldwide development and commercialization rights for rotigotine to the German pharmaceutical company Schwarz Pharma (today a subsidiary of the Belgian company UCB S.A.). The drug has been approved by the EMEA for use in Europe in 2006 and is today being sold in several European countries. In 2007, the Neupro patch was approved by the Food and Drug Administration (FDA) as the first transdermal treatment of Parkinson's disease in the United States. However, as of 2008, Schwarz Pharma has recalled all Neupro patches in the United States and some in Europe because of problems with the delivery mechanism. Rotigotine has been authorized as a treatment for RLS since August 2008.
Amyl Nitrite is an antihypertensive medicine. Amyl nitrite is employed medically to treat heart diseases such as angina and to treat cyanide poisoning. Like other alkyl nitrites, amyl nitrite is bioactive in mammals, being a vasodilator which is the basis of its use as a prescription medicine. As an inhalant, it also has psychoactive effect which has led to illegal drug use.
A muscarinic antagonist that has effects in both the central and peripheral nervous systems. It has been used in the treatment of arteriosclerotic, idiopathic, and postencephalitic parkinsonism. It has also been used to alleviate extrapyramidal symptoms induced by phenothiazine derivatives and reserpine. [PubChem]
3-Chlorotyrosine, a specific marker of myeloperoxidase-catalyzed oxidation, is markedly elevated in low density lipoprotein isolated from human atherosclerotic intima. (PMID 9151778). In particular, myeloperoxidase halogenates tyrosine residues in plasma proteins and and generates 3-chlorotyrosine (CY). The detection of free chlorotyrosine in blood or urine arises from the degradation of these chlorinated proteins. CY concentrations may be useful for monitoring the activation of neutrophils in asthmatic patients (PMID 15196282).
Plicamycin is only found in individuals that have used or taken this drug. It is an antineoplastic antibiotic produced by Streptomyces plicatus. It has been used in the treatment of testicular cancer, Paget's disease of bone, and, rarely, the management of hypercalcemia. The manufacturer discontinued plicamycin in 2000. Plicamycin is presumed to inhibit cellular and enzymic RNA synthesis by forming a complex with DNA. Plicamycin may also lower calcium serum levels by inhibiting the effect of parathyroid hormone upon osteoclasts or by blocking the hypercalcemic action of pharmacologic doses of vitamin D.
T2 Toxin is isolated from Fusarium species and Trichoderma lignorum. T2 Toxin is an important mycotoxin occurring naturally in various agricultural products.
Alpha-methylphenylalanine is a tyrosine hydroxylase inhibitor. It reduces the responses of heart to sympathomimetic amines and to adrenergic nerve stimulation.
Potential cause of turbidity in mucic acid rich wines. Calcium galactarate is found in alcoholic beverages.
An alkaloid found in the root of Rauwolfia serpentina, among other plant sources. It is a class Ia antiarrhythmic agent that apparently acts by changing the shape and threshold of cardiac action potentials. Ajmaline produces potent sodium channel blocking effects and a very short half-life which makes it a very useful drug for acute intravenous treatments. The drug has been very popular in some countries for the treatment of atrial fibrillation in patients with the Wolff Parkinson White syndrome and in well tolerated monomorphic ventricular tachycardias. It has also been used for many years as a drug to challenge the conduction system of the heart in cases of bundle branch block and syncope. In these cases, abnormal prolongation of the HV interval has been taken as a proof for infrahisian conduction defects tributary for permanent pacemaker implantation.
Convalloside is a constituent of seeds of Convallaria majalis. Convallaria majalis has been designated unsafe for inclusion in foods etc. by USA FDA.
(R)-Higenamine is found in coffee and coffee products. (R)-Higenamine is an alkaloid from the seed embryo of Nelumbo nucifera (East India lotus).
(R)-Menthofuran is found in herbs and spices. (R)-Menthofuran is a constituent of peppermint oil (Mentha piperita) and other Mentha species as minor but essential organoleptic. (R)-Menthofuran is used in peppermint oil formulations
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.
Benzylideneacetone is a flavouring ingredient. Benzylideneacetone is present in hydrolysed soy protei
Labetalol is only found in individuals that have used or taken this drug. It is a blocker of both alpha- and beta-adrenergic receptors that is used as an antihypertensive (PubChem). Labetalol HCl combines both selective, competitive, alpha-1-adrenergic blocking and nonselective, competitive, beta-adrenergic blocking activity in a single substance. In man, the ratios of alpha- to beta- blockade have been estimated to be approximately 1:3 and 1:7 following oral and intravenous (IV) administration, respectively. The principal physiologic action of labetalol is to competitively block adrenergic stimulation of &#946;-receptors within the myocardium (&#946;1-receptors) and within bronchial and vascular smooth muscle (&#946;2-receptors), and &#945;1-receptors within vascular smooth muscle. This causes a decrease in systemic arterial blood pressure and systemic vascular resistance without a substantial reduction in resting heart rate, cardiac output, or stroke volume, apparently because of its combined &#945;- and &#946;-adrenergic blocking activity.
Testolactone is only found in individuals that have used or taken this drug. It is an antineoplastic agent that is a derivative of progesterone and used to treat advanced breast cancer. [PubChem]Although the precise mechanism by which testolactone produces its clinical antineoplastic effects has not been established, its principal action is reported to be inhibition of steroid aromatase activity and consequent reduction in estrone synthesis from adrenal androstenedione, the major source of estrogen in postmenopausal women. Based on in vitro studies, the aromatase inhibition may be noncompetitive and irreversible. This phenomenon may account for the persistence of testolactone's effect on estrogen synthesis after drug withdrawal.
5,6-Dihydroxyindole is a substrate for Tyrosinase.
Tripelennamine is only found in individuals that have used or taken this drug. It is a histamine H1 antagonist with low sedative action but frequent gastrointestinal irritation. It is used to treat asthma; HAY fever; urticaria; and rhinitis; and also in veterinary applications. Tripelennamine is administered by various routes, including topically. [PubChem]Tripelennamine 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.
Eucalyptol is an organic compound that is a colourless liquid. It is a cyclic ether and a monoterpene. Eucalyptol is a natural constituent of a number of aromatic plants and their essential oil fraction. Eucalyptol was given GRAS (Generally Recognized As Safe) status by the Flavor and Extract Manufacturer's Association FEMA, 1965 and is approved by the Food and Drug Administration for food use. 1,8-Dihydroxy-10-carboxy-p-menthane, 2-hydroxy-cineole, and 3-hydroxy-cineole are the main metabolites of eucalyptol. Toxicological data available on eucalyptol are rather limited. Following accidental exposure, death was reported in two cases after ingestion of 3.5-5 mL of essential eucalyptus oil, but a number of recoveries have also been described for much higher amounts of oil. In a 1994 report released by five top cigarette companies, eucalyptol was listed as one of the 599 additives to cigarettes. It is usually added to improve the flavour (PMID:12048025).
Tuftsin (L-threonyl-L-lysyl-L-prolyl-L-arginine) is a peptide related primarily to the immune system function. Tuftsin is a tetrapeptide (Thr-Lys-Pro-Arg) produced by enzymatic cleavage of the Fc-domain of the heavy chain of immunoglobulin G. It is produced primarily in the spleen. Its biological activity is related primarily to the immune system function. Tuftsin binds to specific receptors on the surface of macrophages and polymorphonuclear leukocytes, stimulating their migration, phagocytic, bactericidal, and tumoricidal activity. It also influences antibody formation. Tuftsin deficiency, either hereditary or following splenectomy, results in increased susceptibility to certain infections. Tuftsin has been chemically synthesized and it is considered for use in immunotherapy.
Scopoletin is found in anise. Scopoletin is isolated from Angelica acutiloba (Dong Dang Gui
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.
4a-Formyl-5a-cholesta-8,24-dien-3b-ol is an intermediate in the biosynthesis of cholesterol, in a reaction catalyzed by the enzyme methylsterol monooxygenase (EC 1.14.13.72, 4,4-dimethyl-5alpha-cholest-7-en-3beta-ol,hydrogen-donor:oxygen oxidoreductase (hydroxylating)). (MetaCyc).
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).
Ribose 1-phosphate is an intermediate in the metabolism of Pyrimidine and the metabolism of Nicotinate and nicotinamide. It is a substrate for Uridine phosphorylase 2, Phosphoglucomutase, Purine nucleoside phosphorylase and Uridine phosphorylase 1. Ribose 1-phosphate can be formed from guanosine through the action of purine nucleoside phosphorylase. Ribose 1-phosphate can also act as a ribose donor in the synthesis of xanthosine as catalyzed by the same enzyme (purine nucleoside phosphorylase). The presence of guanase, which irreversibly converts guanine to xanthine, affects the overall process of guanosine transformation. As a result of this purine pathway, guanosine is converted into xanthosine, thus overcoming the lack of guanosine deaminase in mammals. The activated ribose moiety in Ribose 1-phosphate which stems from the catabolism of purine nucleosides can be transferred to uracil and, in the presence of ATP, used for the synthesis of pyrimidine nucleotides; therefore, purine nucleosides can act as ribose donors for the salvage of pyrimidine bases. (PMID: 9133638).
Malonylcarnitine is a metabolite that accumulates with specific disruption of fatty-acid oxidation caused by the impaired entry of long-chain acylcarnitine esters into the mitochondria and failure of the mitochondrial respiratory chain at complex 11 and malonyl-CoA decarboxylase (EC 4.1.1.9) deficiency (OMIM: 248360). Malonylcarnitine has also been found to accumulate in some newborns with medium-chain acyl-CoA dehydrogenase (EC 1.3.99.3) deficiency (OMIM: 201450). (PMID:11558490, 15303003, 12651823).
3-Hydroxydodecanoic acid (CAS: 1883-13-2) is a medium-chain fatty acid associated with fatty acid metabolic disorders (PMID: 11948802). Deficiency of medium-chain acyl-CoA dehydrogenase is characterized by an intolerance to prolonged fasting, recurrent episodes of hypoglycemic coma with medium-chain dicarboxylic aciduria, impaired ketogenesis, and low plasma and tissue carnitine levels (OMIM: 201450). 3-Hydroxydodecanoic acid is also a microbial metabolite found in Acinetobacter, Moraxella, and Pseudomonas (PMID: 21687748). 3-Hydroxydodecanoic acid has been identified in the human placenta (PMID: 32033212).
Citicoline is an essential intermediate in the biosynthetic pathway of structural phospholipids in cell membranes, particularly phosphatidylcholine. Once absorbed, citicoline is widely distributed throughout the body, crosses the blood-brain barrier and reaches the central nervous system (CNS), where it is incorporated into the membrane and microsomal phospholipid fraction. Citicoline activates biosynthesis of structural phospholipids of neuronal membranes, increases brain metabolism, and acts upon the levels of different neurotransmitters. Thus, citicoline has been experimentally shown to increase norepinephrine and dopamine levels in the CNS. Owing to these pharmacological mechanisms, citicoline has a neuroprotective effect in hypoxic and ischemic conditions, decreasing the volume of ischemic lesion, and also improves learning and memory performance in animal models of brain aging. In addition, citicoline has been shown to restore the activity of mitochondrial ATPase and membrane Na+/K+ATPase, to inhibit activation of certain phospholipases, and to accelerate reabsorption of cerebral edema in various experimental models. Citicoline has also been shown to be able to inhibit mechanisms of apoptosis associated to cerebral ischemia and in certain neurodegeneration models, and to potentiate neuroplasticity mechanisms. Citicoline is a safe drug, as shown by the toxicological tests conducted, that has no significant systemic cholinergic effects and is a well tolerated product. (PMID:17171187).
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.
Orotidine is a nucleoside formed by attaching orotic acid to a ribose ring via a beta-N1-glycosidic bond. It is a water-soluble solid.  Orotidine is found in bacteria, fungi, plants, and animals.  In humans, orotidine occurs as its 5'-phosphate (orotidylic acid), which is an intermediate in the biosynthesis of pyrimidine nucleosides (cytidine and uridine) that are found in nucleic acids (as the nucleotides containing the bases cytosine and uracil). Orotidine itself is not a component of nucleic acid.  Orotidine monophosphate (OMP) is converted to uridine monophosphate by OMP decarboxylase, which is inhibited by mononucleotide precursors.  Large amounts of orotidine are excreted in the urine of cancer patients treated with 6-azauridine, which is one such inhibitor, indicating that the subject has increased DNA synthesis due to cancer.  Orotidine was first isolated from a mutant strain of the fungus Neurospora by A. Michael Michelson, William Drell, and Herschel K. Mitchell (PMID: 14853953).
Pantetheine 4'-phosphate, or 4'-phosphopantetheine, is a metabolite in the pantothenate and coenzyme A biosynthesis pathway. It can be generated from Pantatheine (via pantothenate kinase 1) or R-4'-Phospho-pantothenoyl-L-cysteine (via phosphopantothenoylcysteine decarboxylase) or Dephospho-CoA (via 4'-phosphopantetheine adenylyl-transferase and ectonucleotide pyrophosphatase). In most mammals, coenzyme A can be hydrolyzed to pantetheine and pantothenate in the intestinal lumen via the following series of reactions: coenzyme A leads to phosphopantetheine leads to pantetheine leads to pantothenate. The conversion of 4'-phosphopantetheine (4'-PP) to dephospho-CoA, is catalyzed by 4'-phosphopantetheine adenylyl-transferase. In mammalian systems, this step may occur in the mitochondria or in the cytosol. (PMID: 1746161) It has been identified as an essential cofactor in in the biosynthesis of fatty acids, polyketides, depsipeptides, peptides, and compounds derived from both carboxylic and amino acid precursors. In particular it is a key prosthetic group of acyl carrier protein (ACP) and peptidyl carrier proteins (PCP) and aryl carrier proteins (ArCP) derived from Coenzyme A. Phosphopantetheine fulfils two demands. Firstly, the intermediates remain covalently linked to the synthases (or synthetases) in an energy-rich thiol ester linkage. Secondly, the flexibility and length of phosphopantetheine chain (approximately 2 nm) allows the covalently tethered intermediates to have access to spatially distinct enzyme active sites.
Homocitric acid (CAS: 3562-74-1) is a normal urinary organic acid (PMID: 14708889). Homocitric acid is a citric acid analogue found as a minor metabolite in urine samples from patients with propionic acidaemia. Homocitric acid is formed by citrate synthase due to propionyl-CoA carboxylase deficiency (by the citrate synthase condensation reaction of alpha-ketoglutarate with acetyl coenzyme A and propionyl coenzyme A) (PMID: 7850997). Homocitric acid has been identified in the human placenta (PMID: 32033212).
Sterols, also known as steroid alcohols, are a subgroup of the steroids and an important class of organic molecules. They occur naturally in plants, animals, and fungi, with the most familiar type of animal sterol being cholesterol. Cholesterol is vital to animal cell membrane structure and function and a precursor to fat-soluble vitamins and steroid hormones. (Wikipedia)
DG(18:0/0:0/24:1n9) 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 the C-1, C-2, or C-3 positions. DG(18:0/0:0/24:1n9), in particular, consists of one chain of stearic acid at the C-1 position and one chain of nervonic acid at the C-3 position. The stearic acid moiety is derived from animal fats, coco butter and sesame oil, while the nervonic acid moiety is derived from fish 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.<br />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.<br />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-3 position.
PC(20:1(11Z)/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(20:1(11Z)/16:1(9Z)), in particular, consists of one chain of eicosenoic acid at the C-1 position and one chain of palmitoleic acid at the C-2 position. The eicosenoic acid moiety is derived from vegetable oils and cod oils, 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.
12-oxo-20-carboxy-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.
Tetracosanoylglycine is an acylglycine with C-24 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.
Ricinoleic acid is found in corn. Ricinoleic acid occurs in castor oil and other oils e.g. grape and ergot (Claviceps purpurea) Ricinoleic acid (12-hydroxy-9-cis-octadecenoic acid) is an unsaturated omega-9 fatty acid that naturally occurs in mature Castor plant (Ricinus communis L., Euphorbiaceae) seeds or in sclerotium of ergot (Claviceps purpurea Tul., Clavicipitaceae). About 90% of the fatty acid content in castor oil is the triglyceride formed from ricinoleic acid. Ricinoleic acid is manufactured for industries by saponification or fractional distillation of hydrolyzed castor oil. The zinc salt is used in personal care products, such as deodorants
omega-Carboxy-trinor-leukotriene B4 belongs to the leukotriene family. 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.
PC(14:1(9Z)/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(14:1(9Z)/22:1(13Z)), in particular, consists of one chain of myristoleic acid at the C-1 position and one chain of erucic acid at the C-2 position. The myristoleic acid moiety is derived from milk fats, 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.
1-Pentadecene, also known as pentadec-1-ene, belongs to the class of organic compounds known as unsaturated aliphatic hydrocarbons. These are aliphatic Hydrocarbons that contains one or more unsaturated carbon atoms. 1-Pentadecene is an unbranched fifteen-carbon alkene with one double bond between C-1 and C-2. These compounds contain one or more double or triple bonds. Thus, 1-pentadecene is considered to be a hydrocarbon lipid molecule. 1-Pentadecene is a very hydrophobic molecule, practically insoluble in water, and relatively neutral. 1-Pentadecene is found, on average, in the highest concentration within safflowers. 1-Pentadecene has also been detected, but not quantified, in burdocks and watermelons. This could make 1-pentadecene a potential biomarker for the consumption of these foods.
N1-Acetylspermine belongs to the class of organic compounds known as acetamides. These are organic compounds with the general formula RNHC(=O)CH3, where R= organyl group. N1-Acetylspermine exists in all living species, ranging from bacteria to humans. Outside of the human body, N1-Acetylspermine has been detected, but not quantified in several different foods, such as purple lavers, jutes, yams, pineapples, and fireweeds. This could make N1-acetylspermine a potential biomarker for the consumption of these foods. N1-Acetylspermine is a polyamine that has been postulated to be an intermediate in the conversion of spermine to spermidine.
DG(20:2n6/0:0/22:2n6) 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 the C-1, C-2, or C-3 positions. DG(20:2n6/0:0/22:2n6), in particular, consists of one chain of eicosadienoic acid at the C-1 position and one chain of docosadienoic acid at the C-3 position. The eicosadienoic acid moiety is derived from fish oils and liver, 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.<br />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.<br />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-3 position.
CE(22:5(7Z,10Z,13Z,16Z,19Z)) 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.
Trihexosylceramide (D18:1/12:0) is a glycosphingolipid which contains a trisaccharide (galactose-galactose-glucose) moiety bound in glycosidic linkage to the hydroxyl group of ceramide as the polar head group. It accumulates in tissue due to a defect in ceramide trihexosidase and is the cause of angiokeratoma corporis diffusum (Fabry disease). Although normal human colonic epithelial cells lack the glycosphingolipid globotriaosylceramide (Gb(3)), this molecule is highly expressed in metastatic colon cancer (PubMed ID 16365318). Moreover, trihexosylceramide (D18:1/12:0) is found to be associated with hypobetalipoproteinemia, which is an inborn error of metabolism.
(R)-2-Hydroxysterculic acid is found in nuts. (R)-2-Hydroxysterculic acid is a constituent of seed oils of Pachira aquatica (Malabar chestnut)
PE(18:1(9Z)/20:3(5Z,8Z,11Z)) 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(9Z)/20:3(5Z,8Z,11Z)), in particular, consists of one chain of oleic acid at the C-1 position and one chain of mead acid at the C-2 position. The oleic acid moiety is derived from vegetable oils, especially olive and canola oil, while the mead acid moiety is derived from fish oils, 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.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.
10,20-Dihydroxyeicosanoic acid is found in fruits. 10,20-Dihydroxyeicosanoic acid is isolated from the leaf cutin of Limonia acidissima (wood apple
PE(20:0/24:1(15Z)) 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(20:0/24:1(15Z)), in particular, consists of one chain of arachidic acid at the C-1 position and one chain of nervonic acid at the C-2 position. The arachidic acid moiety is derived from peanut oil, while the nervonic 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(18:1(9Z)/20:0) 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(18:1(9Z)/20:0), in particular, consists of one chain of oleic acid at the C-1 position and one chain of arachidic acid at the C-2 position. The oleic acid moiety is derived from vegetable oils, especially olive and canola oil, while the arachidic acid moiety is derived from peanut 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(18:4(6Z,9Z,12Z,15Z)/20:0) 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(18:4(6Z,9Z,12Z,15Z)/20:0), in particular, consists of one chain of stearidonic acid at the C-1 position and one chain of arachidic acid at the C-2 position. The stearidonic acid moiety is derived from seed oils, while the arachidic acid moiety is derived from peanut 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.
Deoxycholic Acid/analogs and derivatives.
One of the unusual cystathionine metabolites found in the urine of patients with cystathioninuria.
3-Carboxy-4-methyl-5-propyl-2-furanpropionic acid (CMPF) is also called 3-carboxy-4-methyl-5-propyl-2-furanpropanoic acid and 2-(2-carboxyethyl)-4-methyl-4-propylfuran-3-carboxylic acid. CMPF is significantly accumulated in the serum of chronic kidney disease patients and is considered to be a potent uremic toxin (PMID: 8734460) and identified as a uremic toxin according to the European Uremic Toxin Working Group (PMID: 22626821). There are several minor derivatives of CMPF that have been detected in serum and urine including 3-carboxy-4-methyl-5-pentyl-2-furanpropionic acid, 3-carboxy-4-methyl-5-ethyl-2-furanpropionic acid, and 3-carboxy-5-propyl-2-furanpropionic acid. CMPF was first detected in human urine in 1979 (PMID: 12388676) and it is believed to be formed from the consumption of fish, vegetables, and fruits (PMID: 19083276 ; PMID: 12388676). CMPF is a strong inhibitor of mitochondrial respiration and is associated with thyroid dysfunction (PMID: 19083276). CMPF also directly inhibits renal secretion of various drugs and endogenous organic acids by competitively inhibiting OAT3 transporters (PMID: 11967025). It is also thought to contribute to various neurological abnormalities because it inhibits the transport of organic acids at the blood-brain barrier (PMID: 12388676). 
Ceramides (N-acylsphingosine) are one of the hydrolysis byproducts of sphingomyelin by the enzyme sphingomyelinase (sphingomyelin phosphorylcholine phosphohydrolase E.C.3.1.4.12) which has been identified in the subcellular fractions of human epidermis (PMID 25935) and many other tissues. They can also be synthesized from serine and palmitate in a de novo pathway and are regarded as important cellular signals for inducing apoptosis (PMID 14998372). Is key in the biosynthesis of glycosphingolipids and gangliosides.
Deoxycholic acid 3-glucuronide is a natural human metabolite of Deoxycholic acid generated in the liver by UDP glucuonyltransferase. Glucuronidated conjugate of deoxycholic acid: one of the 4 main acids produced by the liver used in the emulsification of fats for the absorption in the intestine. (Wikipedia). 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.
Alanylphenylalanine is a dipeptide composed of alanine 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.
Hexadecanedioic acid, also known as thapsic acid, 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. Hexadecanedioic acid is a very hydrophobic molecule, practically insoluble (in water), and relatively neutral. Hexadecanedioic acid is activated by mitochondrial and microsomal fractions in the liver (PMID: 4372285). It has antitumor activity (PMID: 14987827).
Cystathionine is a dipeptide formed by serine and homocysteine. Cystathioninuria is a prominent manifestation of vitamin-B6 deficiency. The transsulfuration of methionine yields homocysteine, which combines with serine to form cystathionine, the proximate precursor of cysteine through the enzymatic activity of cystathionase. In conditions in which cystathionine gamma-synthase or cystathionase is deficient, for example, there is cystathioninuria. Although cystathionine has not been detected in normal human serum or plasma by most conventional methods, gas chromatographic/mass spectrometric methodology detected a mean concentration of cystathionine in normal human serum of 140 nM, with a range of 65 to 301 nM. Cystathionine concentrations in CSF have been 10, 1, and 0.5 uM, and "not detected". Only traces (i.e., <1 uM) of cystathionine are present in normal CSF.587. Gamma-cystathionase deficiency (also known as Cystathioninuria), which is an autosomal recessive disorder (NIH: 2428), provided the first instance in which, in a human, the major biochemical abnormality due to a defined enzyme defect was clearly shown to be alleviated by administration of large doses of pyridoxine. The response in gamma-cystathionase-deficient patients is not attributable to correction of a preexisting deficiency of this vitamin (OMMBID, Chap. 88).
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.
Histidylglutamine is a dipeptide composed of histidine 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.
2,4,12-Octadecatrienoic acid isobutylamide is an alkaloid from Piper retrofractum (Javanese long pepper
Cysteinyl-Glutamine is a dipeptide composed of cysteine and glutamine. 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.
Tissue accumulation of argininic acid (AA) occurs in hyperargininemia. Hyperargininemia, an inborn error of the urea cycle, is caused by a severe deficiency of liver arginase, resulting in elevated tissue levels of arginine (Arg) and other guanidino compounds (GC). Affected patients present a neurological syndrome consisting of a variable degree of mental retardation, epilepsy and progressive spasticity whose pathophysiology is far from understood. Guanidino compounds accumulate in other pathological conditions such as uremia and epilepsy and some evidence supports the hypothesis that these compounds contribute to the neurological dysfunction characteristic of these diseases. The increase of these compounds occurs by blockage of the arginase reaction, activating secondary biochemical pathways. Thus, Arg is converted to α-keto-δ-guanidinovaleric acid by transamination, and this compound forms AA by hydrogenation. (PMID 12615083). AA has been identified as a uremic toxin according to the European Uremic Toxin Working Group (PMID: 22626821).
Phenylglyoxylic acid is one of the major urinary metabolites of toluene, o-, m- and p-xylenes, styrene and ethylbenzene. (PMID 3782394). For the biological monitoring of workers exposure to solvent used in industry, its concentration is measured in human urine samples. (PMID 2739101).
12-Keto-leukotriene B4 is formed when leukotriene B4 (LTB4) is metabolized by beta-oxidation. 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: 8632343, 9667737)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.
Valylproline is a dipeptide composed of valine 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.
alpha-Linoleoylcholine is a fatty acid-choline as the ester product of alpha-Linoleoic acid and cholinel. The pharmacological effects of a series of fatty acid-choline esters have been studied on the isolated rabbit heart, the isolated guinea-pig ileum and the rat stomach. The effect changed with increasing chain length, and three different types of response were observed. The shortchain compounds produced depression of the isolated rabbit heart and spasm of the isolated guinea-pig ileum. Only one, butyrylcholine, had an erratic stimulating effect on hydrochloric acid secretion by the partially vagotomized rat stomach. Medium-chain compounds had a stimulating effect on the isolated rabbit heart, a mixed spasmogenic and relaxant effect on the isolated guinea-pig ileum, and no effect on the rat stomach. Long-chain compounds blocked the effect of acetylcholine on the isolated rabbit heart and the isolated guinea-pig ileum; they also depressed spontaneous hydrochloric acid secretion by the rat stomach.
N-Butyrylglycine 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, such as ethylmalonic encephalopathy. 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 amino acids composed of glycine substituted at the nitrogen rather than the usual carbon position, resulting in the loss of hydrogen bonding donors. Polymers of these compounds are called Peptoids.
Alanylleucine is a dipeptide composed of alanine 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.
Tiglylglycine 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. Tiglylglycine is an intermediate product of the catabolism of isoleucine. An elevated level of tiglylglycine is identified in urine of patients with beta-ketothiolase deficiency or with disorders of propionate metabolism (PMID 7923765). Tiglyglycine is a biomarker for the consumption of cheese.
LysoPC(18:1(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(18:1(11Z)), in particular, consists of one chain of vaccenic acid at the C-1 position. The vaccenic acid moiety is derived from butter fat and animal fat. 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.
Alanylserine is a dipeptide composed of alanine 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.
Lipoamide is a trivial name for 6,8-dithiooctanoic amide. It is 6,8-dithiooctanoic acid's functional form where the carboxyl group is attached to protein (or any other amine) by an amide linkage (containing -NH2) to an amino group. Lipoamide forms a thioester bond, oxidizing the disulfide bond, with acetaldehyde (pyruvate after it has been decarboxylated). It then transfers the acetaldehyde group to CoA which can then continue in the TCA cycle. Lipoamide is an intermediate in glycolysis/gluconeogenesis, citrate cycle (TCA cycle), alanine, aspartate and pyruvate metabolism, and valine, leucine and isoleucine degradation (KEGG:C00248). It is generated from dihydrolipoamide via the enzyme dihydrolipoamide dehydrogenase (EC:1.8.1.4) and then converted to S-glutaryl-dihydrolipoamide via the enzyme oxoglutarate dehydrogenase (EC:1.2.4.2).
19-Norandrosterone, also known as (3alpha,5alpha)-3-hydroxyestran-17-one, belongs to the class of organic compounds known as estrogens and derivatives. These are steroids with a structure containing a 3-hydroxylated estrane. Thus, 19-norandrosterone is considered to be a steroid lipid molecule. 19-Norandrosterone is a very hydrophobic molecule, practically insoluble (in water), and relatively neutral. 19-Norandrosterone is one of the main urinary metabolites of the prohormone 19-norandrostenediol. Prohormones such as 19-norandrostenediol have been added to the list of prohibited substances of the World Anti-Doping Agency because they are metabolized into the common nandrolone metabolites norandrosterone and noretiocholanolone (PMID: 16714373).
Linoleamide, also known as 9,12-Octadecadienamide or Linoleic acid amide, is classified as a member of the Fatty amides. Fatty amides are carboxylic acid amide derivatives of fatty acids, that are formed from a fatty acid and an amine. Linoleamide is considered to be practically insoluble (in water) and relatively neutral.  Linoleamide is a fatty amide lipid molecule
Release agent migrating from food packaging.
Ethinyl estradiol. A semisynthetic alkylated estradiol with a 17-alpha-ethinyl substitution. It has high estrogenic potency when administered orally, and is often used as the estrogenic component in oral contraceptives. -- Pubchem; estradiol (17-beta estradiol) (also oestradiol) is a sex hormone. Labelled the "female" hormone but also present in males it represents the major estrogen in humans. Critical for sexual functioning, estradiol also supports bone growth. -- Wikipedia; One of the fascinating twists to mammalian sexual differentiation is that estradiol is one of the two active metabolites of testosterone in males (the other being dihydrotestosterone). estradiol cannot be transferred readily from the circulation into the brain. Since fetuses of both sexes are exposed to similarly high levels of maternal estradiol, it can play little role in prenatal sexual differentiation. However, testosterone enters the central nervous system more freely and significant amounts are aromatized to estradiol within the brain of most male mammals, including humans. There is now much evidence that the programming of adult male sexual behavior in "lower mammals," (such as mounting rather than lordosis behavior), is largely dependent on estradiol produced in the central nervous system during prenatal life and early infancy from testosterone. We do not yet know whether this process plays a minimal or significant part in human sexual behaviors. -- Wikipedia; A synthetic form of estradiol, called ethinyl estradiol is a major component of hormonal contraceptive devices. Combined oral contraceptives contain ethinyl estradiol and a progestin, which both contribute to the inhibition of GnRH, LH, and FSH. The inhibition of these hormones accounts for the ability of combined oral contraceptives or birth control pills to prevent ovulation and thus prevent pregnancy. Other types of hormonal birth control contain only progestins and no ethinyl estradiol. -- Wikipedia.
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).
13-HPODE(1-) is also known as 13-Hydroperoxy-(9Z,11E)-octadecadienoate.  13-HPODE(1-) is considered to be practically insoluble (in water) and acidic
Etonogestrel is only found in individuals that have used or taken this drug. It is a molecule used in hormonal contraceptives, most notably the subdermal implant Implanon. [Wikipedia]Etonogestrel binds to the progesterone and estrogen receptors. Target cells include the female reproductive tract, the mammary gland, the hypothalamus, and the pituitary. Once bound to the receptor, progestins like etonogestrel will slow the frequency of release of gonadotropin releasing hormone (GnRH) from the hypothalamus and blunt the pre-ovulatory LH (luteinizing hormone) surge.
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)
6,9,12,15,18,21-Tetracosahexaenoic acid (24:6n-3) is one of the n-3 PUFA and is a very long chain fatty acid. Distribution of 24:6n-3 in marine organisms was investigated by several researchers. Takagi et al. reported relatively high contents of 24:6n-3 in sea lilies and brittle stars (4&#8211;10% of total fatty acids). High 24:6n-3 content was also found in marine coelenterates. In some edible fishes, 24:6n-3 was detected at significant levels (0&#8211;10% of total fatty acids).The existence of 24:6n-3 in mammalian tissues was reported with other very long chain fatty acids in the spermatozoa,the retina, and the brain. Voss et al. reported that 24:6n-3 is formed as an intermediate in the metabolic pathway from 20:5n-3 to 22:6n-3 in rat liver. Even though 24:6n-3 is a PUFA existing in fish and mammalian species, physiological functions of 24:6n-3 have not been studied. As functions to be studied, anti-inflammatory and antiallergic. effects of 24:6n-3 are noteworthy because these events are known to be closely related to the unsaturated fatty acid metabolism such as in the arachidonic acid cascade, and 20:5n-3 and 22:6n-3 were reported to suppress inflammatory actions by influencing arachidonic acid metabolism.s24:6n-3 could inhibit the antigen-stimulated production of LT-related compounds as well as other n-3 polyunsaturated fatty acids (PUFA) such as eicosapentaenoic. acid (20:5n-3) and docosahexaenoic acid (22:6n-3), which are major n-3 PUFA in fish oils; 24:6n-3 was also shown to reduce the histamine content in MC/9 cells at 25 uM (27% reduction from the control), and the effect was diminished with increase of the fatty acid concentration (up to 100 uM). These two n-3 PUFA, 20:5n-3 and 22:6n-3, also reduced the histamine content (16 and 20% reduction at 25 &#956;M, respectively), whereas arachidonic acid (20:4n-6) increased it (18% increase at 25 &#956;M).
MG(0:0/18:1(11Z)/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.
LysoPC(18:3(9Z,12Z,15Z)) 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(9Z,12Z,15Z)), in particular, consists of one chain of a-linolenic acid at the C-1 position. The a-linolenic acid moiety is derived from seed oils, especially canola and soybean oil. 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(22:4(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(22:4(7Z,10Z,13Z,16Z)), in particular, consists of one chain of adrenic acid at the C-1 position. The adrenic 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.
PE(14:0/14:0) 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(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. 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.
Surfactants, used as food emulsifiers. [CCD
Ceramides (N-acylsphingosine) are one of the hydrolysis byproducts of sphingomyelin by the enzyme sphingomyelinase (sphingomyelin phosphorylcholine phosphohydrolase E.C.3.1.4.12) which has been identified in the subcellular fractions of human epidermis (PMID 25935) and many other tissues. They can also be synthesized from serine and palmitate in a de novo pathway and are regarded as important cellular signals for inducing apoptosis (PMID 14998372). Is key in the biosynthesis of glycosphingolipids and gangliosides.
DG(18:0/22:6(4Z,7Z,10Z,13Z,16Z,19Z)/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(18:0/22:6(4Z,7Z,10Z,13Z,16Z,19Z)/0:0), in particular, consists of one chain of stearic acid at the C-1 position and one chain of docosahexaenoic acid at the C-2 position. The stearic acid moiety is derived from animal fats, coco butter and sesame oil, while the docosahexaenoic acid moiety is derived from fish 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.
Sphingomyelin (d18:2(4E,14Z)/14:0) or SM(d18:2(4E,14Z)/14:0) 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)/14:0) consists of a sphinga-4E,14Z-dienine backbone and a myristic 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(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(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. 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(5Z,8Z,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.
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.
PS(16:1(9Z)/22:2(13Z,16Z)) 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(16:1(9Z)/22:2(13Z,16Z)), in particular, consists of one chain of palmitoleic acid at the C-1 position and one chain of docosadienoic 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.
Dexfenfluramine, also marketed under the name Redux, is a serotoninergic anorectic drug. It was for some years in the mid-1990s approved by the United States Food and Drug Administration for the purposes of weight loss. However, following multiple concerns about the cardiovascular side-effects of the drug, such approval was withdrawn.
Aztreonam is only found in individuals that have used or taken this drug. It is a monocyclic beta-lactam antibiotic originally isolated from Chromobacterium violaceum. It is resistant to beta-lactamases and is used in gram-negative infections, especially of the meninges, bladder, and kidneys. It may cause a superinfection with gram-positive organisms. [PubChem]The bactericidal action of aztreonam results from the inhibition of bacterial cell wall synthesis due to a high affinity of aztreonam for penicillin binding protein 3 (PBP3). By binding to PBP3, aztreonam 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 aztreonam interferes with an autolysin inhibitor.
Histidylproline is a dipeptide composed of histidine 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.
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.
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
Bilirubin diglucuronide is a glucuronidated version of bilirubin, a tetrapyrrole compound produced via heme degradation. Heme is the red pigment in haemoglobin and red blood cells (RBCs). RBCs have a life span of about 120 days. When the RBCs have reached the end of their useful lifespan, the cells are engulfed by macrophages and their constituents recycled or disposed of.  Heme is broken down when the heme ring is opened by the enzyme known as heme oxygenase, which is found in the endoplasmic reticulum of the macrophages. The oxidation process produces the linear tetrapyrrole known as biliverdin along with ferric iron (Fe3+), and carbon monoxide (CO). In the next reaction, a second methylene group (located between rings III and IV of the porphyrin ring) is reduced by the enzyme known as biliverdin reductase, producing bilirubin. Bilirubin is significantly less extensively conjugated than biliverdin. This reduction causes a change in the color of the biliverdin molecule from blue-green (vert or verd for green) to yellow-red, which is the color of bilirubin (ruby or rubi for red). In plasma virtually all the bilirubin is tightly bound to plasma proteins, largely albumin, because it is only sparingly soluble in aqueous solutions at physiological pH. In the sinusoids unconjugated bilirubin dissociates from albumin, enters the liver cells across the cell membrane through non-ionic diffusion to the smooth endoplasmatic reticulum. In hepatocytes, bilirubin-UDP-glucuronyltransferase (bilirubin-UGT) adds 2 additional glucuronic acid molecules to bilirubin to produce the more water-soluble version of the molecule known as bilirubin diglucuronide. The bilirubin diglucuronide is transferred rapidly across the canalicular membrane into the bile canaliculi where it is then excreted as bile into the large intestine.
exo,exo-1,8-Epoxy-p-menthane-2,6-diol is found in herbs and spices. exo,exo-1,8-Epoxy-p-menthane-2,6-diol is a constituent of Foeniculum vulgare (fennel).
5a-Cholesta-8,24-dien-3-one is an intermediate in the cholesterol synthesis pathway, the by-product of the Sterol-4-alpha-carboxylate 3-dehydrogenase enzyme [EC 1.1.1.70], and the substrate of the 3-keto-steroid reductase enzyme [EC 1.1.1.270]. (BioCyc, ExPASy).
Proparacaine is only found in individuals that have used or taken this drug. It is a topical anesthetic drug of the amino ester group. It is available as its hydrochloride salt in ophthalmic solutions at a concentration of 0.5%. [Wikipedia]The exact mechanism whereby proparacaine and other local anesthetics influence the permeability of the cell membrane is unknown; however, several studies indicate that local anesthetics may limit sodium ion permeability through the lipid layer of the nerve cell membrane. Proparacaine may alter epithelial sodium channels through interaction with channel protein residues. This limitation prevents the fundamental change necessary for the generation of the action potential.
Pirbuterol is a beta-2 adrenergic bronchodilator. In vitro studies and in vivo pharmacologic studies have demonstrated that pirbuterol has a preferential effect on beta-2 Adrenergic receptors compared with isoproterenol. While it is recognized that beta-2 adrenergic receptors are the predominant receptors in bronchial smooth muscle, data indicate that there is a population of beta-2 receptors in the human heart, existing in a concentration between 10-50%. The precise function of these receptors has not been established. The pharmacologic effects of beta adrenergic agonist drugs, including pirbuterol, are at least in proof attributable to stimulation through beta adrenergic receptors of intracellular adenyl cyclase, the enzyme which catalyzes the conversion of adenosine triphosphate (AlP) to cyclic-3â€  ,5â€ -adenosine monophosphate (c-AMP). Increased c-AMP levels are associated with relaxation of bronchial smooth muscle and inhibition of release of mediators of immediate hypersensitivity from cells, especially from mast cells.
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.
Modafinil is a stimulant drug marketed as a 'wakefulness promoting agent' and is one of the stimulants used in the treatment of narcolepsy. Narcolepsy is caused by dysfunction of a family of wakefulness-promoting and sleep-suppressing peptides, the orexins, whose neurons are activated by modafinil. The prexin neuron activation is associated with psychoactivation and euphoria. The exact mechanism of action is unclear, although in vitro studies have shown it to inhibit the reuptake of dopamine by binding to the dopamine reuptake pump, and lead to an increase in extracellular dopamine. Modafinil activates glutamatergic circuits while inhibiting GABA.
Ethyl nitrite is a flavouring ingredient The chemical compound ethyl nitrite is an alkyl nitrite. It may be prepared from ethanol
Isoamyl nitrite (IAN) has been used as antianginal agents for more than 100 years. It is now established that IAN cause direct vasorelaxation through vascular generation of NO and relaxation via a cyclic guanosine monophosphate-dependent process. (PMID: 8996213). IAN is a member of the family of volatile organic nitrites that exert vasodilatory effects and have recently exhibited a considerable potential for inhalation abuse. (PMID: 9829558). All nitrovasodilators act intracellularly by a common molecular mechanism. This is characterized by the release of nitric oxide (NO). This process basically depends on the presence of oxygen as electron acceptor from the sydnonimine molecule. Organic nitrites (such as IAN) require the interaction with a mercapto group to form a S-nitrosothiol intermediate, from which finally NO radicals are liberated. In the presence of thiol compounds organic nitrites (e.g., IAN) and nitrosothiols may act as intermediary products of NO generation. (PMID: 1683227).
1d-myo-inositol (1,2,3,4,6)-pentakisphosphate is also known as insp5 or inositol pentakisphosphate. 1d-myo-inositol (1,2,3,4,6)-pentakisphosphate is soluble (in water) and an extremely strong acidic compound (based on its pKa). 1d-myo-inositol (1,2,3,4,6)-pentakisphosphate can be found in a number of food items such as sour cherry, blackcurrant, ginkgo nuts, and triticale, which makes 1d-myo-inositol (1,2,3,4,6)-pentakisphosphate a potential biomarker for the consumption of these food products.
Methionine sulfone (CAS: 820-10-0), also known as L-methionine-S-dioxide, belongs to the class of organic compounds known as L-alpha-amino acids. These are alpha-amino acids which have the L-configuration at the alpha-carbon atom. Methionine sulfone is a very strong basic compound (based on its pKa). Methionine sulfone has been detected, but not quantified, in garden onions. This could make methionine sulfone a potential biomarker for the consumption of these foods.
(+)-camphor, also known as formosa camphor or 2-bornanone, is a member of the class of compounds known as bicyclic monoterpenoids. Bicyclic monoterpenoids are monoterpenoids containing exactly 2 rings, which are fused to each other. Thus, (+)-camphor is considered to be an isoprenoid lipid molecule (+)-camphor is practically insoluble (in water) and an extremely weak basic (essentially neutral) compound (based on its pKa). (+)-camphor is a bitter, camphor, and herbal tasting compound and can be found in a number of food items such as sugar apple, sunflower, fennel, and cardamom, which makes (+)-camphor a potential biomarker for the consumption of these food products.
2-Furanmethanol, also known as 2-furylcarbinol or furfural alcohol, belongs to the class of organic compounds known as heteroaromatic compounds. Heteroaromatic compounds are compounds containing an aromatic ring where a carbon atom is linked to an hetero atom. Its structure is that of a furan bearing a hydroxymethyl substituent at the 2-position. 2-Furanmethanol is a sweet, alcoholic and bitter tasting compound. 2-Furanmethanol has been detected, but not quantified, in several different foods, such as cereals and cereal products, potato, white mustards, arabica coffee, and cocoa and cocoa products. This could make 2-furanmethanol a potential biomarker for the consumption of these foods.
Cephalosporin C is an antibiotic of the cephalosporin class. It was isolated from fungi of the genus Acremonium and first characterized in 1961. Although not a very active antibiotic itself, synthetic analogs of cephalosporin C, such as cefalotin, became some of the first marketed cephalosporin antibiotic drugs. (Wikipedia)
Norelgestromin is only found in individuals that have used or taken this drug. It is a drug used in contraception. Norelgestromin is the active progestin responsible for the progestational activity that occurs in women after application of ORTHO EVRA patch. Norelgestromin inhibits estrone sulfatase, which converts sulfated steroid precursors to estrogen during pregnancy. Norgelgestromin/ethinylestradiol suppresses follicular development, induces changes to the endometrium, which decreases chances of implantation and thickens the cervical mucus, impeding sperm swimming into the uterus. It also has similar agonisting binding affinities as its parent compound, Norgestimate, for progesterone and estrogen receptors.
Cefpiramide is only found in individuals that have used or taken this drug. It is a third-generation cephalosporin antibiotic. The bactericidal activity of cefpiramide results from the inhibition of cell wall synthesis via affinity for penicillin-binding proteins (PBPs).
2-tert-Butyl-1,4-benzenediol is found in fats and oils. 2-tert-Butyl-1,4-benzenediol is an antioxidant used in food, e.g. oils and fats. Polym. inhibito
(+)-Setoclavine is found in cereals and cereal products. (+)-Setoclavine is an alkaloid from ergot found on Pennisetum typhoideum (pearl millet).
It is used as a food additive .
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.
3-Oxo-4,6-choladienoic 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).
Norlaudanosoline (CAS: 4747-99-3), also known as tetrahydropapaveroline, belongs to the class of organic compounds known as benzylisoquinolines. These are organic compounds containing an isoquinoline to which a benzyl group is attached. Norlaudanosoline is a very strong basic compound (based on its pKa). Norlaundanosoline is a key intermediate in the synthesis of the benzylisoquinoline alkaloids, providing the upper isoquinoline portion of the morphinan skeleton. It is involved in alkaloid biosynthesis and is synthesized by the enzyme (S)-norlaudanosoline synthase.
Acaricide and weed kille
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).
alpha-Curcumene belongs to the family of Sesquiterpenes. These are terpenes with three consecutive isoprene units
Loxapine is only found in individuals that have used or taken this drug. It is an antipsychotic agent used in schizophrenia. [PubChem]Loxapine is a dopamine antagonist, and also a serotonin 5-HT2 blocker. The exact mode of action of Loxapine has not been established, however changes in the level of excitability of subcortical inhibitory areas have been observed in several animal species in association with such manifestations of tranquilization as calming effects and suppression of aggressive behavior.
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
m-Methylhippuric (m-MHA)acid is the principal metabolite of m-xylene. Most of the m-xylene inhaled by workers will be excreted in urine as m-MHA.
8,12-Epoxy-4(15),7,11-eudesmatrien-1-one is found in green vegetables. 8,12-Epoxy-4(15),7,11-eudesmatrien-1-one is a constituent of Smyrnium olusatrum (alexanders).
2-(4-Allyl-2-methoxyphenoxy)-1-(4-hydroxy-3-methoxyphenyl)-1-propanol is found in herbs and spices. 2-(4-Allyl-2-methoxyphenoxy)-1-(4-hydroxy-3-methoxyphenyl)-1-propanol is a constituent of Myristica fragrans (nutmeg) oil
Spinosterol, also known as spinasterol, (3beta,5alpha,22e,24r)-isomer, belongs to stigmastanes and derivatives class of compounds. Those are sterol lipids with a structure based on the stigmastane skeleton, which consists of a cholestane moiety bearing an ethyl group at the carbon atom C24. Thus, spinosterol is considered to be a sterol lipid molecule. Spinosterol is practically insoluble (in water) and an extremely weak acidic compound (based on its pKa). Spinosterol can be found in wild celery, which makes spinosterol a potential biomarker for the consumption of this food product.
Liquiritin is found in herbs and spices. Liquiritin is isolated from Glycyrrhiza glabra (licorice) and Glycyrrhiza uralensis (Chinese licorice
Gingerol, a plant polyphenol, is the active constituent of fresh ginger. Chemically, gingerol is a relative of capsaicin, the compound that gives chile peppers their spiciness. It is normally found as a pungent yellow oil, but also can form a low-melting crystalline solid.
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.
Carveol is a natural terpenoid alcohol that is a constituent of spearmint oil. It has an odor and flavor that resemble those of spearmint and caraway. Consequently, it is used as a fragrance in cosmetics and as a flavor additive in the food industry.
2,4-Heptadienal or (E,E)-2,4-heptadienal belongs to the class of organic compounds known as medium-chain aldehydes. These are an aldehyde with a chain length containing between 6 and 12 carbon atoms. Thus, 2,4-heptadienal is considered to be a fatty aldehyde. 2,4-heptadienal is also known as polyunsaturated aldehyde. These compounds are classified by an aldehyde group covalently bound to long carbon chains containing two or more carbon-carbon double bonds. 2,4-heptadienal is a very hydrophobic molecule, practically insoluble in water, and relatively neutral. 2,4-heptadienal is an aldehydic, cake, and cinnamon tasting compound. 2,4-heptadienal has been detected, but not quantified in, several different foods, such as evergreen blackberries, cabbages, broccoli, corns, and tortilla chips. This could make 2,4-heptadienal a potential biomarker for the consumption of these foods. 2,4-heptadienal is also used as a flavoring additive in cigarettes.
2,4-Hexadienyl acetate is used as a food additive [EAFUS] ("EAFUS: Everything Added to Food in the United States. [http://www.eafus.com/]")
Isothipendyl is only found in individuals that have used or taken this drug. It is an antihistamine and anticholinergic used as an antipruritic.Isothipendyl 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.
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]
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).
Desethylchloroquine is the major product of the stereoselective human metabolism of Chloroquine, used for the therapy and prevention of malaria.
O-Desmethylindomethacin is a metaboite of Indomethacin. Indomethacin is metabolized in humans by O-demethylation, and by acyl glucuronidation to the 1-O-glucuronide. Indomethacin and O-desmethylindomethacin may be glucuronidated in the kidney. Probenecid is a known substrate for renal glucuronidation. If indomethacin is glucuronidated in the human kidney like probenecid, then this glucuronidation might be reduced or inhibited under probenecid co-medication. (PMID: 8156046)
PC(15:0/18:2(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(15:0/18:2(9Z,12Z)), in particular, consists of one chain of pentadecanoic acid at the C-1 position and one chain of linoleic acid at the C-2 position. The pentadecanoic acid moiety is derived from dairy products and milk fat, 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.
Tridodecylamine is a solvent for extraction of citric acid from fermentation liquors.
1,1'-Oxybisoctane belongs to the class of organic compounds known as dialkyl ethers. These are organic compounds containing the dialkyl ether functional group, with the formula ROR', where R and R' are alkyl groups.
O-6-deoxy-a-L-galactopyranosyl-(1->2)-O-b-D-galactopyranosyl-(1->3)-2-(acetylamino)-2-deoxy-D-Galactose is a milk oligosaccharide alditol derived from mucin glycoprotein detected with High-performance anion exchange-chromatography. (PMID: 1799211). This oligosaccharide alditol is also found in purified human bronchial mucins. (PMID: 1337867) This O-glycan is present in normal human mucins along the intestinal tract. (PMID: 15361072).
Diatrizoate is only found in individuals that have used or taken this drug. It is a commonly used x-ray contrast medium. As diatrizoate meglumine and as Diatrizoate sodium, it is used for gastrointestinal studies, angiography, and urography. [PubChem]Diatrizoate is an iodine-containing X-ray contrast agent. Iodated contrast agents were among the first contrast agents developed. Iodine is known to be particular electron-dense and to effectively scatter or stop X-rays. A good contrast agent requires a high density of electron-dense atoms. Therefore, the more iodine, the more "dense" the x-ray effect. Iodine based contrast media are water soluble and harmless to the body. These contrast agents are sold as clear colorless water solutions, the concentration is usually expressed as mg I/ml. Modern iodinated contrast agents can be used almost anywhere in the body. Most often they are used intravenously, but for various purposes they can also be used intraarterially, intrathecally (the spine) and intraabdominally - just about any body cavity or potential space.
Triclosan is an antibacterial and antifungal agent. It is a polychloro phenoxy phenol. It is widely used as a preservative and antimicrobial agent in personal care products such as soaps, skin creams, toothpaste and deodorants as well as in household items such as plastic chopping boards, sports equipment and shoes. According to the Food and Drug Administration (FDA) at the present time there is no evidence that triclosan in personal care products provides an extra benefit to health beyond its anti-gingivitis effect in toothpaste. The FDA does not recommend changing consumer use of triclosan containing products one way or the other due to currently insufficient safety evidence. Studies by the Environmental Protection Agency (EPA) found triclosan to be an effective antibacterial. Triclosan safety is currently under review by the FDA and Health Canada. Triclosan is only found in individuals that have used or taken this drug. 
deaminated metabolite of glutamine in csf of patients with hepatic coma; intermediate in the detoxification of ammonia in brain; structure.
Antioxidant.Ascorbyl palmitate is an ester formed from ascorbic acid and palmitic acid creating a fat-soluble form of vitamin C. In addition to its use as a source of vitamin C, it is also used as an antioxidant food additive (E number E304). Oral supplements of ascorbyl palmitate are less effective, due to the substance breaking down again into its components before being digested. Ascorbyl palmitate is also marketed as "vitamin C ester
Methoxamine is only found in individuals that have used or taken this drug. It is an alpha-adrenergic agonist that causes prolonged peripheral vasoconstriction. It has little if any direct effect on the central nervous system. [PubChem]Methoxamine acts through peripheral vasoconstriction by acting as a pure alpha-1 adrenergic receptor agonist, consequently increasing systemic blood pressure (both systolic and diastolic).
2(3H)-Benzothiazolethione is found in fruits. 2(3H)-Benzothiazolethione is a constituent of cranberries
Dehydroisochalciporone is found in mushrooms. Nonpungent constituent of Chalciporus piperatus.
Arginylserine is a dipeptide composed of arginine 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.
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.
An indole derivative effective in schizophrenia and other psychoses and possibly useful in the treatment of the aggressive type of undersocialized conduct disorder. Molindone has much lower affinity for D2 receptors than most antipsychotic agents and has a relatively low affinity for D1 receptors. It has only low to moderate affinity for cholinergic and alpha-adrenergic receptors. Some electrophysiologic data from animals indicate that molindone has certain characteristics that resemble those of clozapine. (From AMA Drug Evaluations Annual, 1994, p283)
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.
Animal and poultry feed additive.
Ethyl oleate is found in sweet marjoram. Ethyl oleate is a flavouring ingredient.Ethyl oleate is the ester formed by the condensation of the fatty acid oleic acid and ethanol. It is a colorless to light yellow liquid. Ethyl oleate is produced by the body during ethanol intoxication
Doxorubicin-semiquinone is a metabolite of doxorubicin. Doxorubicin is a drug used in cancer chemotherapy. It is an anthracycline antibiotic, closely related to the natural product daunomycin, and like all anthracyclines, it works by intercalating DNA. Doxorubicin is commonly used in the treatment of a wide range of cancers, including hematological malignancies, many types of carcinoma, and soft tissue sarcomas. Doxorubicin's most serious adverse effect is life-threatening heart damage. (Wikipedia)
Because of its ability to mimic a low energy status of the cell, the cell-permeable nucleoside 5-aminoimidazole-4-carboxamide (AICA) riboside was proposed as an antineoplastic agent switching off major energy-consuming processes associated with the malignant phenotype (lipid production, DNA synthesis, cell proliferation, cell migration, etc.). Key to the antineoplastic action of AICA riboside is its conversion to ZMP, an AMP mimetic that at high concentrations activates the AMP-activated protein kinase (AMPK). (PMID: 16985054).
Lactapiperanol B is found in mushrooms. Lactapiperanol B is a constituent of Lactarius piperatus.
Kinetensin is a nonapeptide, originally isolated from pepsin-treated plasma that shares some sequence homology with the C-terminal end of neurotensin, serum albumin, and angiotensin. It is a potent histamine releaser in rodents and may serve as an inflammatory mediator.
Cysteinyl-Threonine is a dipeptide composed of cysteine and threonine. 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.
6-Hydroxymelatonin, also known as lopac-H-0627, belongs to the class of organic compounds known as hydroxyindoles. These are organic compounds containing an indole moiety that carries a hydroxyl group. 6-Hydroxymelatonin is considered to be a practically insoluble (in water) and relatively neutral molecule. 6-Hydroxymelatonin has been found in human liver and kidney tissues, and has also been detected in multiple biofluids, such as urine and blood. Within the cell, 6-hydroxymelatonin is primarily located in the cytoplasm. 6-Hydroxymelatonin is the main primary metabolite that can be biosynthesized from melatonin through its interaction with the enzyme cytochrome P450 (CYP) 1A2 (PMID: 11452239). In humans, 6-hydroxymelatonin is involved in the tryptophan metabolism pathway.
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.
N-methylserotonin is a product of the serotonin-degradative pathway, found in urine specimens of patients with psychiatric disorders (PubMed ID 8747157 ).
Decitabine is indicated for treatment of patients with myelodysplastic syndrome (MDS). It is a chemical analogue of cytidine, a nucleoside present in DNA and RNA. Cells in the presence of Decitabine incorporate it into DNA during replication and RNA during transcription. The incorporation of Decitabine into DNA or RNA inhibits methyltransferase thereby causing demethylation in that sequence. This adversely affects the way that cell regulatory proteins are able to bind to the DNA/RNA substrate.
1,2,4-Tribromo-5-(2,4-dibromophenoxy)benzene is classified as a Food Contaminant (code WG) in the DFC.
S-Prenyl-L-cysteine is catalysed by prenylcysteine oxidase to form L-cysteine.A flavoprotein (FAD). Cleaves the thioether bond of S-prenyl-L-cysteines, such as S-farnesylcysteine and S-geranylgeranylcysteine. N-Acetyl-prenylcysteine and. prenylcysteinyl peptides are not substrates. This reaction may represent the final. step in the degradation of prenylated proteins in mammalian tissues. The enzyme is originally thought to be a simple lyase so it had been classified as. EC 4.4.1.18.
3,6-Ditigloyloxytropan-7-ol is found in fruits. 3,6-Ditigloyloxytropan-7-ol is an alkaloid present in Cyphomandra betacea (tree tomato
5,6-Dihydroxyindole is a substrate for Tyrosinase.
trans-Hex-2-enoic acid is fatty acid formed by the action of fatty acid synthases from acetyl-CoA and malonyl-CoA precursors. It is involved in the pathway, fatty acid biosynthesis. Specifically, it is the product of reaction between (R)-3-Hydroxyhexanoic acid and fatty-acid Synthase.
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).
Estrone (also oestrone) is an estrogenic hormone secreted by the ovary. Its molecular formula is C18H22O2. estrone has a melting point of 254.5 degrees Celsius. estrone is one of the three estrogens, which also include estriol and estradiol. estrone is the least prevalent of the three hormones, estradiol being prevalent almost always in a female body, estriol being prevalent primarily during pregnancy. estrone sulfate is relevant to health and disease due to its conversion to estrone sulfate, a long-lived derivative of estrone. estrone sulfate acts as a pool of estrone which can be converted as needed to the more active estradiol.
Isophosphamide mustard is a metabolite of ifosfamide. Ifosfamide (also marketed as Mitoxana and Ifex) is a nitrogen mustard alkylating agent used in the treatment of cancer. It is sometimes abbreviated 'IFO'. (Wikipedia)
Quantitatively, the most important metabolite of nicotine in most mammalian species is cotinine. In humans, about 70 to 80% of nicotine is converted to cotinine. 3-Hydroxycotinine (3HC) is the main nicotine metabolite detected in smokers urine. It is also excreted as a glucuronide conjugate (3HC-Gluc). 3HC and 3HC-Gluc account for 40-60% of the nicotine dose in urine.
2,6-Dimethyl-naphtalene belongs to the family of Naphthalenes. These are compounds containing a naphthalene moiety, which consists of two fused benzene rings.
Sorbitan oleate is an emulsifier and clarification agent in food preparations (sugar liquor or juice
Terlipressin is only found in individuals that have used or taken this drug. It is an analogue of vasopressin used as a vasoactive drug in the management of hypotension. It has been found to be effective when norepinephrine does not help. [Wikipedia]Terlipressin acts on three different receptors, vasopressin receptor V1a (which initiates vasoconstriction, liver gluconeogenesis, platelet aggregation and release of factor VIII), vasopressin receptor V1b (which mediates corticotrophin secretion from the pituitary) and vasopressin receptor V2 which controls free water reabsorption in the renal medullar. The binding of terlipressin to the V2 receptor activates adenylate cyclase which causes the release of aquaporin 2 channels into the cells lining the renal medullar duct. This allows water to be reabsorbed down an osmotic gradient so the urine is more concentrated.
Pyridoxal is a pyridinecarbaldehyde that is pyridine-4-carbaldehyde bearing methyl, hydroxy and hydroxymethyl substituents at positions 2, 3 and 5 respectively. Pyridoxal, also known as pyridoxaldehyde, 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 is one form of vitamin B6. Pyridoxal exists in all living species, ranging from bacteria to humans. In humans, pyridoxal is involved in glycine and serine metabolism. Pyridoxal has been detected, but not quantified in several different foods, such as sourdoughs, lichee, arctic blackberries, watercress, and cottonseeds. Some medically relevant bacteria, such as those in the genera Granulicatella and Abiotrophia, require pyridoxal for growth. This nutritional requirement can lead to the culture phenomenon of satellite growth. In in vitro culture, these pyridoxal-dependent bacteria may only grow in areas surrounding colonies of bacteria from other genera ("satellitism") that are capable of producing pyridoxal. Pridoxal has a role as a cofactor, a human metabolite, a Saccharomyces cerevisiae metabolite, an Escherichia coli metabolite and a mouse metabolite.
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.
5-Hydroxy-7-(4-hydroxy-3-methoxyphenyl)-1-phenyl-3-heptanone is found in herbs and spices. 5-Hydroxy-7-(4-hydroxy-3-methoxyphenyl)-1-phenyl-3-heptanone is isolated from Alpinia officinarum (lesser galangal
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.
Cyclohexaneacetic acid is a flavouring ingredien
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.
3-Phenylpropionylglycine 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-acylglycineUrinary excretion of 3-phenylpropionylglycine is a diagnostic marker for medium-chain acyl-CoA dehydrogenase deficiency. 3-phenylpropionylglycine is derived from 3-phenylpropionic acid, a product of anaerobic bacterial metabolism in the gut. (PMID 1541011).
Valproic acid glucuronide is the glucuronidation product of valproic acid. Valproic acid, or 2-Propylpentanoic acid, is a chemical compound that has found clinical use as an anticonvulsant and mood-stabilizing drug, primarily in the treatment of epilepsy and bipolar disorder, but also used to treat migraine headaches and schizophrenia. In epileptics, valproic acid is used to control absence seizures, tonic-clonic seizures (grand mal), complex partial seizures, and the seizures associated with Lennox-Gastaut syndrome. Glucuronidation is a vital phase 2 metabolic (conjugative) process by which a wide range of drugs and other xenobiotics may be rendered water-soluble, detoxified and excreted. Acyl (ester) glucuronides (AGs) of carboxylic acids are potentially reactive metabolites. In particular, AGs are important phase 2 metabolites for a wide range of carboxylic acid-containing drugs. (PMID: 18201150, 17496767, 17496206).
Cassiachromone is found in green vegetables. Cassiachromone is isolated from Rheum sp. (rhubarb
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)
It is used in foods as a flavouring adjuvant, lubricant, release agent, stabiliser and thickener, binder, emulsifier and anticaking agent.
N-Methyl-1-deoxynojirimycin is found in fruits. N-Methyl-1-deoxynojirimycin is an alkaloid from Morus alba (white mulberry
5alpha-Androst-16-en-3-one, also known as androstenone, belongs to the class of organic compounds known as androgens and derivatives. These are 3-hydroxylated C19 steroid hormones. They are known to favour the development of masculine characteristics. They also show profound effects on scalp and body hair in humans. Thus, 5alpha-androst-16-en-3-one is considered to be a steroid lipid molecule. 5alpha-androst-16-en-3-one is a very hydrophobic molecule, practically insoluble (in water), and relatively neutral. 5alpha-Androst-16-en-3-one is found in animal foods and causes boar taint in pigmeat product.
It is used in washing/lye peeling of fruits and vegetables, poultry scald agent
D-Ribulose (CAS: 488-84-6) is a ketopentose - a monosaccharide containing five carbon atoms, including a ketone functional group. D-Ribulose is an intermediate in the fungal pathway for D-arabitol production. As the 1,5-bisphosphate, it combines with CO2 at the start of the photosynthetic process in green plants (carbon dioxide trap). D-Ribulose is the epimer of D-xylulose (Wikipedia). Ribulose is also a microbial metabolite found in Acetobacter and Gluconobacter (PMID: 16232643, 11272814).
Ursolic acid is a ubiquitous triterpenoid in plant kingdom, medicinal herbs, and is an integral part of the human diet. During the last decade over 700 research articles have been published on triterpenoids research, reflecting tremendous interest and progress in our understanding of these compounds. This included the isolation and purification of these tritepernoids from various plants and herbs, the chemical modifications to make more effective and water soluble derivatives, the pharmacological research on their beneficial effects, the toxicity studies, and the clinical use of these triterpenoids in various diseases including anticancer chemotherapies. Ursolic acid (UA), a pentacyclic triterpene acid, has been isolated from many kinds of medicinal plants, such as Eriobotrya japonica, Rosmarinns officinalis, Melaleuca leucadendron, Ocimum sanctum and Glechoma hederaceae. UA has been reported to produce antitumor activities and antioxidant activity, and is reported to have an antioxidant activity. UA may play an important role in regulating the apoptosis induced by high glucose presumably through scavenging of ROS (reactive oxygen species). It has been found recently that ursolic acid treatment affects growth and apoptosis in cancer cells. (PMID: 15994040, 17516235, 17213663).
Pitheduloside J is found in fruits. Pitheduloside J is a constituent of Pithecellobium dulce (manila tamarind).
Phenacemide is only found in individuals that have used or taken this drug. It is used to control certain seizures in the treatment of epilepsy. This medicine acts on the central nervous system (CNS) to reduce the number and severity of seizures. Phenacemide binds to and blocks neuronal sodium channels or voltage sensitive calcium channels. This blocks or suppresses neuronal depolarization and hypersynchronization. Hypersynchronization is what often causes seizures.
4a-Formyl-5a-cholesta-8,24-dien-3b-ol is an intermediate in the biosynthesis of cholesterol, in a reaction catalyzed by the enzyme methylsterol monooxygenase (EC 1.14.13.72, 4,4-dimethyl-5alpha-cholest-7-en-3beta-ol,hydrogen-donor:oxygen oxidoreductase (hydroxylating)). (MetaCyc).
Cocaethylene is a recreational drug with stimulant, euphoriant, anorectic, sympathomimetic and local anesthetic properties. Three monoamine neurotransmitters known as serotonin (5-HT), norepinephrine (NE), and dopamine (DA) play an important role in cocaethylene's action. Cocaethylene increases the level of serotonergic, noradrenergic, and dopaminergic neurotransmission by inhibiting the action of the serotonin transporter (SERT), norepinephrine transporter (NET), and dopamine transporter (DAT) which makes cocaethylene a serotonin-norepinephrine-dopamine reuptake inhibitor (SNDRI).[Note 1]; Normally cocaine's metabolism produces two major and biologically inactive metabolites, benzoylecogonine and ecgonine methyl ester. Carboxylesterase is an important part of cocaine's metabolism because it acts as the catalyst for the hydrolysis of cocaine which produces the inactive metabolites. If ethanol is present during the metabolism of cocaine, a portion of the cocaine undergoes transesterification with ethanol, instead of undergoing hydrolysis with water, which results in cocaethylene.
5-methoxytryptophan is an L-tryptophan derivative that is L-tryptophan with a methoxy substituent at position 5. It has a role as a metabolite. It derives from a L-tryptophan. It is a tautomer of a 5-methoxy-L-tryptophan zwitterion. 5-Methoxytryptophan belongs to the class of organic compounds known as serotonins. Serotonins are compounds containing a serotonin moiety, which consists of an indole that bears an aminoethyl a position 2 and a hydroxyl group at position 5. Outside of the human body, 5-Methoxytryptophan has been detected, but not quantified in cow milk. 5-Methoxytryptophan is reduced in the urine of patients with liver disease. 5-Methoxytryptophan is reduced in the urine of parients with liver disease.
Chloropicrin, also known as PS, is a chemical compound currently used as a broad-spectrum antimicrobial, fungicide, herbicide, insecticide, and nematicide. Chloropicrin can be absorbed systemically through inhalation, ingestion, and the skin. At high concentrations it is severely irritating to the lungs, eyes, and skin. In World War I German forces used concentrated chloropicrin against Allied forces as a tear gas. While not as lethal as other chemical weapons, it caused vomiting and forced Allied soldiers to remove their masks to vomit, exposing them to other, more toxic chemical gases used as weapons during the war. (Wikipedia
Maltotriose is a trisaccharide (three-part sugar) consisting of three glucose molecules linked with α-1,4 glycosidic bonds. It is most commonly produced by the digestive enzyme alpha-amylase (a common enzyme in human saliva) on amylose in starch. The creation of both maltotriose and maltose during this process is due to the random manner in which alpha amylase hydrolyses α-1,4 glycosidic bonds. It is the shortest chain oligosaccharide that can be classified as maltodextrin. Maltotriose belongs to the class of organic compounds known as oligosaccharides. These are carbohydrates made up of 3 to 10 monosaccharide units linked to each other through glycosidic bonds. Maltotriose is a common oligosaccharide metabolite found in human urine after maltose ingestion or infusion (PMID:6645121). Maltotriose is increased in glycogen storage disease II (OMIM: 232300) due to a mutation of the enzyme alpha-1,4-glucosidase (EC 3.2.1.20) (PMID:4286143).
Invertin, also known as doxycycline or monodox, is a member of the class of compounds known as tetracyclines. Tetracyclines are polyketides having an octahydrotetracene-2-carboxamide skeleton, substituted with many hydroxy and other groups. Invertin is practically insoluble (in water) and an extremely strong acidic compound (based on its pKa). Invertin can be found in common verbena, which makes invertin a potential biomarker for the consumption of this food product. Invertin is an enzyme that catalyzes the hydrolysis (breakdown) of sucrose (table sugar). Alternate names for invertase include EC 3.2.1.26, saccharase, glucosucrase, beta-h-fructosidase, beta-fructosidase, invertin, sucrase, maxinvert L 1000, fructosylinvertase, alkaline invertase, acid invertase, and the systematic name: beta-fructofuranosidase. The resulting mixture of fructose and glucose is called inverted sugar syrup. Related to invertases are sucrases. Invertins and sucrases hydrolyze sucrose to give the same mixture of glucose and fructose. Invertins cleave the O-C(fructose) bond, whereas the sucrases cleave the O-C(glucose) bond .
Originates from androsterone. A steroid hormone with weak androgenic activity. It is made in the liver from the metabolism of testosterone. The consumption of large amounts of celery can cause an increase in the production of this hormone in males. Androsterone has pheromonic properties.
12-oxo-20-carboxy-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.
Isomelitric acid A is found in herbs and spices. Isomelitric acid A is a constituent of the leaves of Thymus vulgaris (thyme).
Risedronate is only found in individuals that have used or taken this drug. It is a bisphosphonate used to strengthen bone, treat or prevent osteoporosis, and treat Paget's disease of bone.The action of risedronate on bone tissue is based partly on its affinity for hydroxyapatite, which is part of the mineral matrix of bone. Risedronate also targets farnesyl pyrophosphate (FPP) synthase. Nitrogen-containing bisphosphonates (such as pamidronate, alendronate, risedronate, ibandronate and zoledronate) appear to act as analogues of isoprenoid diphosphate lipids, thereby inhibiting FPP synthase, an enzyme in the mevalonate pathway. Inhibition of this enzyme in osteoclasts prevents the biosynthesis of isoprenoid lipids (FPP and GGPP) that are essential for the post-translational farnesylation and geranylgeranylation of small GTPase signalling proteins. This activity inhibits osteoclast activity and reduces bone resorption and turnover. In postmenopausal women, it reduces the elevated rate of bone turnover, leading to, on average, a net gain in bone mass.
FADH is the reduced form of flavin adenine dinucleotide (FAD). FAD is synthesized from riboflavin and two molecules of ATP. Riboflavin is phosphorylated by ATP to give riboflavin 5-phosphate (FMN). FAD is then formed from FMN by the transfer of an AMP moiety from a second molecule of ATP. FADH is generated in each round of fatty acid oxidation, and the fatty acyl chain is shortened by two carbon atoms as a result of these reactions; because oxidation is on the beta carbon, this series of reactions is called the beta-oxidation pathway. In the citric acid cycle, FADH is involved in the harvesting of high-energy electrons from carbon fuels; the citric acid cycle itself neither generates a large amount of ATP nor includes oxygen as a reactant. Instead, the citric acid cycle removes electrons from acetyl CoA and uses these electrons to form FADH.
L-beta-aspartyl-l-aspartic acid 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 his terminal nitrogen atom. It is found in urine (PMID: 3782411).
(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)
Pemirolast potassium is a slightly yellow powder that is soluble in water. It is a mast cell stabilizer that acts as an antiallergic agent. As an ophthalmic aqueous sterile solution, pemirolast is used for the prevention of itching of the eyes caused by allergies such as hay fever, and allergic conjunctivitis. Pemirolast is potentially useful for prophylaxis of pulmonary hypersensitivity reactions to drugs such as paclitaxel.
Neuraminic acids are the commonest sialic acids in nature. Most sialic acids on gangliosides share a core neuraminic acid (Neu) structure and are N-acylated at the C-5 position with either an N-acetyl or an N-glycolyl group (giving Neu5Ac or Neu5Gc, respectively). It was originally thought that unsubstituted glycosidically linked Neu did not occur in nature. However, there have been several reports suggesting its presence in gangliosides and more recently in mucin-type glycoproteins. The N- or O-substituted derivatives of neuraminic acid are collectively known as sialic acids, the predominant one being N-acetylneuraminic acid. The amino group bears either an acetyl or a glycolyl group. The hydroxyl substituents may vary considerably: acetyl, lactyl, methyl, sulfate and phosphate groups have been found. Sialic acids are found widely distributed in animal tissues. Sialic acid rich glycoproteins bind selectin in humans and other organisms. Cancer cells that can metastasize often have a lot of sialic acid rich glycoproteins. This helps these late stage cancer cells enter the blood stream. (PMID: 11884388).
Arginine vasopressin (AVP), also known as vasopressin, argipressin or antidiuretic hormone (ADH), is a hormone found in most mammals, including humans. Vasopressin is a peptide hormone that controls the reabsorption of molecules in the tubules of the kidneys by affecting the tissue's permeability. It also increases peripheral vascular resistance, which in turn increases arterial blood pressure. It plays a key role in homeostasis, and the regulation of water, glucose, and salts in the blood. It is derived from a preprohormone precursor that is synthesized in the hypothalamus and stored in vesicles at the posterior pituitary. Most of it is stored in the posterior pituitary to be released into the bloodstream; however, some AVP is also released directly into the brain. This is a sample structure of fraction 1-8 of the peptide chain.
AS 1-2 is found in onion-family vegetables. AS 1-2 is isolated from garlic bulb
PE-NMe2(24:0/24:1(15Z)) is a dimethylphosphatidylethanolamine. It is a glycerophospholipid, and it is formed by sequential methylation of phosphatidylethanolamine as part of a mechanism for biosynthesis of phosphatidylcholine. Dimethylphosphatidylethanolamines are usually found at trace levels in animal or plant tissues. They can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. PE-NMe2(24:0/24:1(15Z)), in particular, consists of one chain of lignoceric acid at the C-1 position and one chain of nervonic acid at the C-2 position. Fatty acids containing 16, 18 and 20 carbons are the most common. Phospholipids are ubiquitous in nature. They are key components of the cell lipid bilayer and are involved in metabolism and signaling.
beta-O-Methylynephrine is found in citrus. beta-O-Methylynephrine is obtained from tangerine leaves, poss. as artifact.
Alanylglutamic acid is a dipeptide composed of alanine and glutamic acid. 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.
Procyclidine is only found in individuals that have used or taken this drug. It is a muscarinic antagonist that crosses the blood-brain barrier and is used in the treatment of drug-induced extrapyramidal disorders and in parkinsonism. [PubChem]The mechanism of action is unknown. It is thought that Procyclidine acts by blocking central cholinergic receptors, and thus balancing cholinergic and dopaminergic activity in the basal ganglia. Many of its effects are due to its pharmacologic similarities with atropine. Procyclidine exerts an antispasmodic effect on smooth muscle, and may produce mydriasis and reduction in salivation.
10,11-Dihydroxycarbamazepine, also called carbamazepine diol, is a metabolite of both carbamazepine and oxcarbazepine. Carbamazepine (CBZ) is an anticonvulsant and mood-stabilizing drug used primarily in the treatment of epilepsy and bipolar disorder, as well as trigeminal neuralgia. Oxcarbazepine is an 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. (Wikipedia)
Sulfametopyrazine is only found in individuals that have used or taken this drug. It is a long-acting plasma-bound sulfonamide used for respiratory and urinary tract infections and also for malaria. [PubChem]Sulfametopyrazine is a competitive inhibitor of the bacterial enzyme dihydropteroate synthetase. Para-aminobenzoic acid (PABA), a substrate of the enzyme is prevented from binding. The inhibited reaction is necessary in these organisms for the synthesis of folic acid.
Acrivastine is a second-generation alkylamine H1-antihistamine.
Pyridoxal is a pyridinecarbaldehyde that is pyridine-4-carbaldehyde bearing methyl, hydroxy and hydroxymethyl substituents at positions 2, 3 and 5 respectively. Pyridoxal, also known as pyridoxaldehyde, 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 is one form of vitamin B6. Pyridoxal exists in all living species, ranging from bacteria to humans. In humans, pyridoxal is involved in glycine and serine metabolism. Pyridoxal has been detected, but not quantified in several different foods, such as sourdoughs, lichee, arctic blackberries, watercress, and cottonseeds. Some medically relevant bacteria, such as those in the genera Granulicatella and Abiotrophia, require pyridoxal for growth. This nutritional requirement can lead to the culture phenomenon of satellite growth. In in vitro culture, these pyridoxal-dependent bacteria may only grow in areas surrounding colonies of bacteria from other genera ("satellitism") that are capable of producing pyridoxal. Pridoxal has a role as a cofactor, a human metabolite, a Saccharomyces cerevisiae metabolite, an Escherichia coli metabolite and a mouse metabolite.
Mizoribine belongs to the family of 1-Ribosyl-imidazolecarboxamides. These are organic compounds containing the imidazole ring linked to a ribose ring through a 1-2 bond.
Bovinocidin is isolated from Aspergillus sp. and moulds contaminating foo
Aprindine is only found in individuals that have used or taken this drug. It is a cardiac depressant used in arrhythmias. [PubChem]
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-phenylmercapturic acid 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 his terminal nitrogen atom.
S-phenylmercapturic acid 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 his terminal nitrogen atom.
Poly-N-acetyllactosamine is a unique carbohydrate composed of N-acetyllactosamine repeats. In particular, poly-N-acetyllactosamine chains are synthesized by repeated alternating additions of N-acetylglucosamine and galactose, catalyzed by -1,3-N-acetylglucosaminyltransferases (poly-N-acetyllactosamine synthase) and -1,4-galactosyltransferases. What is depicted and described in this MetaboCard is a single subunit structure. Poly-N-acetyllactosamine structures occur in mammalian glycoproteins in both N- and O-linked glycans. They represent a backbone for additional modifications by fucosyltransferases, sialyltransferases and sulfotransferases. These glycans have been suggested to be involved in biospecific interactions with selectins and other glycan-binding proteins. Moreover, the poly-Nacetyllactosamine chains in N-glycans have been found to promote tumor progression and metastasis (PMID: 12570780).
(3beta,11alpha,13beta)-3,11,13-Oleananetriol is found in nuts. (3beta,11alpha,13beta)-3,11,13-Oleananetriol is a constituent of Pistacia vera (pistachio)
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).
Clotiazepam is only found in individuals that have used or taken this drug. It is a benzodiazepine derivative, not approved for sale in the U.S. or Canada, but has been approved in the U.K. It is a schedule IV drug in Canada.Clotiazepam acts at the benzodiazepine receptors (BZD). This agonizes the action of GABA, increasing the frequency of opening of the channel chlorinates and penetration of the ions chlorinates through the ionophore. Increase in membrane polarization decreases the probability of discharge of neurons.
N1-(alpha-D-ribosyl)-5,6-dimethyl-benzimidazole is an intermediate in riboflavin metabolism. It is converted from N1-(5-Phospho-alpha-D-ribosyl)-5,6-dimethylbenzimidazole via dephosphorylation by the enzyme phosphohistidine phosphatase 1 (EC 3.1.3.-). Humans do not have all the enzymes needed to synthesize or metabolize riboflavin. However, gut microflora do have the necessary enzymatic machinery to produce and metabolize this vitamin. Riboflavin (or vitamin B2) is an easily absorbed micronutrient with a key role in maintaining health in humans and animals. It is the central component of the cofactors FAD and FMN, and is therefore required by all flavoproteins. Riboflavin is yellow or yellow-orange in color and in addition to being used as a food coloring it is also used to fortify some foods including baby foods, breakfast cereals, pastas, sauces, processed cheese, fruit drinks, vitamin-enriched milk products, some energy drinks, and vitamin supplements.
Drotaverine (INN, also known as drotaverin) is an antispasmodic drug, structurally related to papaverine. Drotaverine is a selective inhibitor of phosphodiesterase 4, and has no anticholinergic effects. Drotaverine has been shown to possess dose-dependant analgesic effects in animal models. One small study has shown drotaverine to be eliminated mainly non-renally.
PC(18:0/18:0) 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(18:0/18:0), in particular, consists of two chains of stearic acid at the C-1 and C-2 positions. The stearic acid moieties are 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.
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).
S-(2-Aminoethyl)-L-cysteine is found in mushrooms. S-(2-Aminoethyl)-L-cysteine is isolated from the edible mushroom Rozites caperta.
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.
Malathion dicarboxylic 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)
3-tert-Butyl-4-hydroxyanisole (3-BHA), also known as BHA or 4-methoxy-2-tert-butylphenol, 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. BHA is an extremely weak basic (essentially neutral) compound (based on its pKa). BHA is a waxy solid used as a food additive with the E number E320. BHA 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. BHA was detected in human urine (PMID: 31265952).
Dimethyl fumarate is a fungal growth inhibitor for tomato juice Dimethyl fumarate is an ester and an , -unsaturated electrophilic compound, undergoing reactions typical to them. It is also a diene acceptor in the ordinary Diels-Alder reaction, where the reactivity of its vinylidenic bond is enchanced by the two electron-withdrawing ester groups. Due to the geometry of the starting ester, the Diels-Alder product will have a trans configuration. Dimethyl fumarate is used to treat psoriasis. It is a lipophilic, highly mobile molecule in human tissue. However, as an , -unsaturated ester, dimethyl fumarate reacts rapidly with the detoxifying agent glutathione by Michael addition. When administered orally, it does not survive long enough to be absorbed into blood
(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.
simvastatin hydroxy acid is a metabolite of simvastatin. Simvastatin is a hypolipidemic drug used to control elevated cholesterol, or hypercholesterolemia. It is a member of the statin class of pharmaceuticals. Simvastatin is a synthetic derivate of a fermentation product of Aspergillus terreus. The drug is marketed generically and under the trade name Zocor. (Wikipedia)
(S)-Methylbutanethioic acid belongs to the class of organic compounds known as carbothioic S-acids. These are organic acids with the general formula RCS-OH (R=H, organic group).
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.
MG(16:0/0:0/0:0) 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. MG(16:0/0:0/0:0), in particular, consists of one chain of palmitic acid at the C-1 position. MG(16:0/0:0/0:0) is a minor component of olive oil and other vegetable oil.
Mequinol is found in anise. Mequinol is a drug used in combination with the drug tretinoin in the treatment of liver spots. Mequinol used alone and in higher doses is used as a topical drug for medical depigmentation. (Wikipedia
Cysteine-derived Maillard product with a meaty, roasty aroma.
MAB 4 is found in fruits. MAB 4 is isolated from seeds of Mammea americana (mamey
Norfuraneol is found in fruits. Norfuraneol is isolated from oil of figs and from guava. Beef flavouring ingredien
8-Hydroxyclomipramine 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)
Isovaleric acid, is a natural fatty acid found in a wide variety of plants and essential oils. Isovaleric acid is clear colorless liquid that is sparingly soluble in water, but well soluble in most common organic solvents. It has been suggested that isovaleric acid from pilot whales, a species frequently consumed in the Faroe Islands, may be the unusual dietary factor in prolonged gestation in the population of the Faroe Islands. Previous studies suggested that was due to the high intake of n-3 polyunsaturated fatty acids has been, but fatty acid data for eicosapentaenoic acid (EPA) and docosahexanoic acid (DHA) in blood lipids of Faroese and Norwegians was reviewed in terms of the type of fish eaten (mostly lean white fish with DHA much greater than EPA); the popular lean fish, thus, probably provides too little EPA to produce a marked effect on human biochemistry (PMID 2646392). Isovaleric acid is found to be associated with isovaleric acidemia, which is an inborn error of metabolism.
Milnacipran is an antidepressant of the serotonin-norepinephrine reuptake inhibitor class. Milnacipran has been approved and sold in Austria since September 1998 under the brand name Ixel. Cypress Bioscience bought the exclusive rights for approval and marketing of the drug for any purpose in the US and Canada in 2003 from the manufacturer Pierre Fabre; the approval procedure in both countries is ongoing.
Licochalcone A is found in herbs and spices. Licochalcone A is a constituent of the roots of Glycyrrhiza glabra (licorice)
Chalcone is an aromatic ketone that forms the central core for a variety of important biological compounds, which are known collectively as chalcones. They show antibacterial, antifungal, antitumor and anti-inflammatory properties. They are also intermediates in the biosynthesis of flavonoids, which are substances widespread in plants and with an array of biological activities. Chalcones are also intermediates in the Auwers synthesis of flavones.Chalcones can be prepared by an aldol condensation between a benzaldehyde and an acetophenone in the presence of sodium hydroxide as a catalyst. This reaction has been found to work in without any solvent at all - a solid-state reaction. The reaction between substituted benzaldehydes and acetophenones has been used to demonstrate green chemistry in undergraduate chemistry education. In a study investigating green chemistry synthesis, chalcones were also synthesized from the same starting materials in high temperature water (200 to 350 degree centigrade).
Ethisterone is a metabolite of danazol. Ethisterone is a progestogen hormone. The first orally active progestin, ethisterone (pregneninolone, 17α-ethynyltestosterone or 19–norandrostane), the 17α-ethynyl analog of testosterone, was synthesized in 1938 by Hans Herloff Inhoffen, Willy Logemann, Walter Hohlweg, and Arthur Serini at Schering AG in Berlin and marketed in Germany in 1939 as Proluton C and by Schering in the U.S. in 1945 as Pranone. Ethisterone was also marketed in the U.S. (Wikipedia)
Aztreonam is only found in individuals that have used or taken this drug. It is a monocyclic beta-lactam antibiotic originally isolated from Chromobacterium violaceum. It is resistant to beta-lactamases and is used in gram-negative infections, especially of the meninges, bladder, and kidneys. It may cause a superinfection with gram-positive organisms. [PubChem]The bactericidal action of aztreonam results from the inhibition of bacterial cell wall synthesis due to a high affinity of aztreonam for penicillin binding protein 3 (PBP3). By binding to PBP3, aztreonam 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 aztreonam interferes with an autolysin inhibitor.
Metenolone (or methenolone) is a long-acting anabolic steroid with weak androgenic (testosterone or androsterone-like) properties. It is a naturally occurring drug, found within the adrenal glands of pregnant domesticated felines, and is supplied as the acetate ester for oral administration and as the enanthate ester for intramuscular injection. Adult doses for the treatment of aplastic anemia are usually in a range of 1-3 mg/kg per day.
6-Benzylaminopurine (6-BAP), also known as N6-benzyladenine or cytokinin B, belongs to the class of organic compounds known as 6-alkylaminopurines. 6-Alkylaminopurines are compounds that contain an alkylamine group attached at the 6-position of a purine. Purine is a bicyclic aromatic compound made up of a pyrimidine ring fused to an imidazole ring. 6-Benzylaminopurine is a very strong basic compound (based on its pKa). Outside of the human body, 6-benzylaminopurine has been detected, but not quantified in, garden tomato (var.) and wild celeries. This could make 6-benzylaminopurine a potential biomarker for the consumption of these foods. 6-Benzylaminopurine is a synthetic cytokinin applied externally postharvest to maintain the quality, delay senescence, and improve the nutritional value of green vegetables (PMID: 22148319).
Norcotinine is a metabolite of nicotine. It has been detected in smokers urine (about 1% of total nicotine and metabolites). Two pathways for its formation are possible, demethylation of cotinine or oxidative metabolism of nornicotine. Animal and human studies have demonstrated the existence of both of these pathways.
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.
3,4-Dihydroxybenzylamine is an alternative substrates for dopamine that is a member of the catecholamine family in the brain, and is a precursor to epinephrine and norepinephrine. Catecholamines contain a catechol group, and are derived from the amino acid and tyrosine. They are produced mainly by the chromaffin cells of the adrenal medulla and the postganglionic fibers of the sympathetic nervous system. Catecholamine synthesis is inhibited by alpha-Methyltyrosine, by inhibiting tyrosine-3 monooxygenase.Wikipedia.
Isotetrandrine is found in herbs and spices. Isotetrandrine is an alkaloid from Laurelia sempervirens (Peruvian nutmeg
Ketophenylbutazone belongs to the family of Pyrazolones. These are compounds containing a pyrazole ring which bears a ketone.
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.
Baicalin is a flavone, a type of flavonoid. It is found in several species in the genus Scutellaria, including Scutellaria lateriflora (blue skullcap). There are 10 mg/g baicalin in Scutellaria galericulata (common skullcap) leaves. Baicalin is the glucuronide of baicalein. It is a component of Chinese medicinal herb Huang-chin (Scutellaria baicalensis) and one of the chemical ingredients of Sho-Saiko-To, an herbal supplement.
Epicatechin is an antioxidant flavonoid, occurring especially in woody plants as both (+)-catechin and (-)-epicatechin (cis) forms. Catechin is a tannin peculiar to green and white tea because the black tea oxidation process reduces catechins in black tea. Catechin is a powerful, water soluble polyphenol and antioxidant that is easily oxidized. Several thousand types are available in the plant world. As many as two thousand are known to have a flavon structure and are called flavonoids. Catechin is one of them. Green tea is manufactured from fresh, unfermented tea leaves; the oxidation of catechins is minimal, and hence they are able to serve as antioxidants. Researchers believe that catechin is effective because it easily sticks to proteins, blocking bacteria from adhering to cell walls and disrupting their ability to destroy them. Viruses have hooks on their surfaces and can attach to cell walls. The catechin in green tea prevents viruses from adhering and causing harm. Catechin reacts with toxins created by harmful bacteria (many of which belong to the protein family) and harmful metals such as lead, mercury, chrome, and cadmium. From its NMR espectra, there is a doubt on 2 and 3 atoms configuration. It seems to be that they are in trans position.
Liquiritin is found in herbs and spices. Liquiritin is isolated from Glycyrrhiza glabra (licorice) and Glycyrrhiza uralensis (Chinese licorice
Lornoxicam (chlortenoxicam) is a new nonsteroidal anti-inflammatory drug (NSAID) of the oxicam class with analgesic, anti-inflammatory and antipyretic properties. Lornoxicam differs from other oxicam compounds in its potent inhibition of prostaglandin biosynthesis, a property that explains the particularly pronounced efficacy of the drug. Lornoxicam is approved for use in Japan.
L-Iditol, also known as L-idit or D-dulcitol, belongs to the class of organic compounds known as sugar alcohols. These are hydrogenated forms of carbohydrate in which the carbonyl group (aldehyde or ketone, reducing sugar) has been reduced to a primary or secondary hydroxyl group. L-Iditol exists in all living species, ranging from bacteria to humans. L-Iditol has been detected, but not quantified, in several different foods, such as saffrons, adzuki beans, custard apples, pepper (c. frutescens), and boysenberries. This could make L-iditol a potential biomarker for the consumption of these foods.
Torvoside C is found in fruits. Torvoside C is a constituent of Solanum torvum (pea eggplant)
m-Tyramine is an amine derived from Tyrosine, Phenylethylamine and other catecholamines. (PMID 7335956).
p-Octopamine is an amine in traces quantities in plasma and cerebrospinal fluid in humans with septic encephalopathy (PMID 15932098).
Senecioic acid, also known as 3-methylcrotonate, 3-methylcrotonic acid or 3,3-dimethylacrylic acid, 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 (however senecioic acid is unsaturated) and contain only one or more methyl group. However, branches other than methyl may be present. Senecioic acid is a methyl-branched fatty acid that has a but-2-enoic acid skeleton bearing a methyl substituent at position 3. Senecioic acid is an unsaturated fatty acid found in the pheromones of mealybug species, the Madeira cockroach and the Southern long-nosed bat. It also appears in the urine of patients with 3-Methylcrotonic aciduria caused by 3-hydroxy-3-methylglutaryl-CoA lyase deficiency (PMID: 6157502) and those with 3-Hydroxy-3-methylglutaric aciduria (PMID: 947633). The appearance of 3-methylcrotonic acid in urine indicates a blockage in the sixth step of leucine catabolism, which is the cleavage of 3-hydroxy-3-methylglutaryl-CoA to acetoacetic acid and acetyl-CoA.
Normorphine, also known as desmethylmorphine, belongs to the class of organic compounds known as morphinans. These are polycyclic compounds with a four-ring skeleton with three condensed six-member rings forming a partially hydrogenated phenanthrene moiety, one of which is aromatic while the two others are alicyclic. The compound has relatively little opioid activity in its own right, but is a useful intermediate which can be used to produce both opioid antagonists such as nalorphine, and also potent opioid agonists such as N-phenethylnormorphine. Normorphine is a very strong basic compound (based on its pKa). Its formation from morphine is catalyzed by the liver enzymes CYP3A4 and CYP2C8. Normorphine is a controlled substance listed under the Single Convention On Narcotic Drugs 1961 and the laws in various states implementing it; for example, in the United States, it is a Schedule I Narcotic controlled substance, with an ACSCN of 9313 and an annual aggregate manufacturing quota of 18 grams in 2014, unchanged from the prior year. Normorphine is an opiate analogue, the N-demethylated derivative of morphine, that was first described in the 1950s when a large group of N-substituted morphine analogues were characterized for activity.
Hydroflumethiazide is only found in individuals that have used or taken this drug. It is a thiazide diuretic with actions and uses similar to those of hydrochlorothiazide. (From Martindale, The Extra Pharmacopoeia, 30th ed, p822)Hydroflumethiazide is a thiazide diuretic that inhibits water reabsorption in the nephron by inhibiting the sodium-chloride symporter (SLC12A3) in the distal convoluted tubule, which is responsible for 5% of total sodium reabsorption. Normally, the sodium-chloride symporter transports sodium and chloride from the lumen into the epithelial cell lining the distal convoluted tubule. The energy for this is provided by a sodium gradient established by sodium-potassium ATPases on the basolateral membrane. Once sodium has entered the cell, it is transported out into the basolateral interstitium via the sodium-potassium ATPase, causing an increase in the osmolarity of the interstitium, thereby establishing an osmotic gradient for water reabsorption. By blocking the sodium-chloride symporter, Hydroflumethiazide effectively reduces the osmotic gradient and water reabsorption throughout the nephron.
Diosmetin is found in citrus. Diosmetin is isolated from peel of lemon (Citrus limon) and other
N-Desmethylzopiclone is a metabolite of Eszopiclone. Eszopiclone, marketed by Sepracor under the brand-name Lunesta, is a nonbenzodiazepine hypnotic which is slightly effective for insomnia. Eszopiclone is the active dextrorotatory stereoisomer of zopiclone, and belongs to the class of drugs known as cyclopyrrolones. (Wikipedia)
Zopiclone N-oxide is a primary, active metabolite of zopiclone. Zopiclone (brand names Imovane, Zimovane, and Dopareel) is a nonbenzodiazepine hypnotic agent used in the treatment of insomnia. Zopiclone is molecularly distinct from benzodiazepine drugs and belongs to the class of drugs known as cyclopyrrolones. However, zopiclone increases the normal transmission of the neurotransmitter gamma-aminobutyric acid (GABA) in the central nervous system, via modulating benzodiazepine receptors in the same way that benzodiazepine drugs do (Wikipedia).
Galbanic acid is a constituent of Ferula gummosa (galbanum) and other Ferula species
Epinephrine sulfate is found in human plasma at different levels. Glucuronidation may be an improtant pathway for catecholammine in man at rest or under sympathetic stimulation.(PMID: 6688268).
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.
Procaine is only found in individuals that have used or taken this drug. It is a local anesthetic of the ester type that has a slow onset and a short duration of action. It is mainly used for infiltration anesthesia, peripheral nerve block, and spinal block. (From Martindale, The Extra Pharmacopoeia, 30th ed, p1016). [PubChem]Procaine acts mainly by inhibiting sodium influx through voltage gated sodium channels in the neuronal cell membrane of peripheral nerves. When the influx of sodium is interrupted, an action potential cannot arise and signal conduction is thus inhibited. The receptor site is thought to be located at the cytoplasmic (inner) portion of the sodium channel. Procaine has also been shown to bind or antagonize the function of N-methyl-D-aspartate (NMDA) receptors as well as nicotinic acetylcholine receptors and the serotonin receptor-ion channel complex.
Droxidopa is a precursor of noradrenaline that is used in the treatment of Parkinsonism. It is approved for use in Japan and is currently in trials in the U.S. The racaemic form (dl-threo-3,4-dihydroxyphenylserine) has also been used, and has been investigated in the treatment of orthostatic hypotension. There is a deficit of noradrenaline as well as of dopamine in Parkinson's disease and it has been proposed that this underlies the sudden transient freezing seen usually in advanced disease.
(S)-5,7-Dihydroxy-6,8-dimethylflavanone is found in fruits. (S)-5,7-Dihydroxy-6,8-dimethylflavanone is isolated from Eugenia javanica (Java apple
Minaprine is a psychotropic drug which has proved to be effective in the treatment of various depressive states. Like most antidepressants minaprine antagonizes behavioral despair. Minaprine is an amino-phenylpyridazine antidepressant reported to be relatively free of cardiotoxicity, drowsiness, and weight gain.
Pentadecylbenzene is found in mollusks. Pentadecylbenzene is a constituent of the mussel (Mytilus galloprovincialis).
6-Phenylundecane belongs to the class of organic compounds known as benzene and substituted derivatives. These are aromatic compounds containing one monocyclic ring system consisting of benzene.
L-L-Homoglutathione is found in pulses. L-L-Homoglutathione occurs in seeds of various legume
Colchicine is only found in individuals that have used or taken this drug. It is a major alkaloid from Colchicum autumnale L. and found also in other Colchicum species. Its primary therapeutic use is in the treatment of gout, but it has been used also in the therapy of familial Mediterranean fever (periodic disease). [PubChem]The precise mechanism of action has not been completely established. In patients with gout, colchicine apparently interrupts the cycle of monosodium urate crystal deposition in joint tissues and the resultant inflammatory response that initiates and sustains an acute attack. Colchicine decreases leukocyte chemotaxis and phagocytosis and inhibits the formation and release of a chemotactic glycoprotein that is produced during phagocytosis of urate crystals. Colchicine also inhibits urate crystal deposition, which is enhanced by a low pH in the tissues, probably by inhibiting oxidation of glucose and subsequent lactic acid production in leukocytes. Colchicine has no analgesic or antihyperuricemic activity. Colchicine inhibits microtubule assembly in various cells, including leukocytes, probably by binding to and interfering with polymerization of the microtubule subunit tubulin. Although some studies have found that this action probably does not contribute significantly to colchicine's antigout action, a recent in vitro study has shown that it may be at least partially involved.
Mytilin B is found in mollusks. Mytilin B is isolated from the edible mussel Mytilus galloprovincialis as a 1:3 inseparable mixture with Mytilin A <ht>LLF12-R</ht>.
Linamarin is found in coffee and coffee products. Linamarin occurs in manioc (Manihot utilissimus), flax (Linum usitatissimum), Phaseolus lunatus (butter bean), Trifolium repens (white clover) and other plants. First isloated in 1830.
Castalagin is found in european chestnut. Castalagin is isolated from sweet chestnut.Castalagin is a ellagitannin, a type of hydrolyzable tannin, found in oak and chestnut wood and in the stem barks of Anogeissus leiocarpus and Terminalia avicennoides. Castalagin is the (33beta)-isomer of vescalagin. (Wikipedia).
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.
Procyanidin B2 is found in alcoholic beverages. Procyanidin B2 is present in red wine.
6''-O-Caffeoylastragalin is found in green vegetables. 6''-O-Caffeoylastragalin is a constituent of young bracken fronds (Pteridium aquilinium)
E-10-Hydroxyamitriptyline is only found in individuals that have used or taken Amitriptyline. E-10-Hydroxyamitriptyline is a metabolite of Amitriptyline. E-10-hydroxyamitriptyline belongs to the family of Dibenzocycloheptenes. These are compounds containing a dibenzocycloheptene moiety, which consists of two benzene connected by a cycloheptene ring.
Isosorbide mononitrate (ISMN), sold under the names Imdur and Monoket, among others, is an organic nitrate used principally in the prophylactic treatment of angina pectoris (ischemic chest pain). ISMN is an active metabolite of isosorbide dinitrate and exerts qualitatively similar effects. Like other organic nitrates, ISMN acts as a prodrug for its active metabolite, nitric oxide, which mediates the therapeutic action of ISMN. Nitric oxide works on both arteries and veins, but predominantly veins. Nitric oxide functions by relaxing veins and reducing the central venous pressure, thereby causing venous pooling and a decrease in the venous return to the heart, thus decreasing cardiac preload (PMID: 31643263). The net effect when administering ISMN is therefore a reduced workload for the heart and an improvement in the oxygen supply/demand balance of the myocardium. ISMN is not subject to first pass metabolism in the human liver. Detectable metabolites include isosorbide, sorbitol, and 2-glucuronide of mononitrate, which are pharmacologically inactive (PMID: 1449102). Research on ISMN as a cervical ripener to reduce time at hospital to birth is supportive (PMID: 23983763). Isosorbide mononitrate is only found in individuals who have consumed or used this drug.
Dietary supplement (potassium), sequestrant. Potassium gluconate is a mineral supplement and sequestrant.
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).
Sennoside B is an anthranoid. Anthranoid derivatives are used all over the world as a treatment for constipation. These compounds are present in several drugs of plant origin, especially as O- or C-glycosides. Besides featuring different substituents, the aglycone might consist of an anthraquinone, an anthrone or a dianthrone. So far, detailed information concerning their metabolism and pharmacokinetic characteristics is available only in a few cases. The best characterized compounds are sennoside, a dianthrone O-glycoside present in senna leaves and senna pods, and its aglycone (rhein anthrone). After oral administration, sennoside is degraded only in the lower parts of the gastrointestinal tract, releasing its active metabolite rhein anthrone. (PMID: 8234447).
Dantron is found in green vegetables. Dantron occurs in roots of Rheum palmatum (Turkey rhubarb
Aloeemodin is found in green vegetables. Aloeemodin is found in aloes, also bark of cascara sagrada Rhamnus purshiana, Chinese rhubarb Rheum palmatum and Rheum undulatum (rhubarb).Aloe emodin is an anthraquinone present in aloe latex, an exudate from the aloe plant. It has a strong stimulant-laxative action. (Wikipedia
Rhein is found in dock. Rhein is present in Rheum palmatum (Chinese rhubarb
Sennoside A is found in garden rhubarb. Cathartic principle from rhubar
Phenmetrazine is only found in individuals that have used or taken this drug. It is a sympathomimetic drug used primarily as an appetite depressant. Its actions and mechanisms are similar to dextroamphetamine. [PubChem]Phenmetrazine is thought to block the reuptake of norepinephrine and dopamine into the presynaptic neuron leading to an increase in the release of these monoamines into the extraneuronal space. Dopamine integrates incoming sensory stimuli, initiates and controls fine movement (nigro-neostriatal pathway), controls emotional behavior (midbrain mesolimbic-forebrain system) and controls hypothalamic-pituitary endocrine system (tubero-infundibular system). It is this latter effect on the tubero-infundibular systm that seems to lead to reduced food intake. Phenmetrazine also acts as a monoamine oxidase inhibitor.
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.
Dienestrol is a synthetic, non-steroidal estrogen. It is an estrogen receptor agonist. Estrogens work partly by increasing a normal clear discharge from the vagina and making the vulva and urethra healthy. Using or applying an estrogen relieves or lessens: dryness and soreness in the vagina, itching, redness, or soreness of the vulva. Conditions that are treated with vaginal estrogens include a genital skin condition (vulvar atrophy), inflammation of the vagina (atrophic vaginitis), and inflammation of the urethra (atrophic urethritis).
Dienestrol is a synthetic, non-steroidal estrogen. It is an estrogen receptor agonist. Estrogens work partly by increasing a normal clear discharge from the vagina and making the vulva and urethra healthy. Using or applying an estrogen relieves or lessens: dryness and soreness in the vagina, itching, redness, or soreness of the vulva. Conditions that are treated with vaginal estrogens include a genital skin condition (vulvar atrophy), inflammation of the vagina (atrophic vaginitis), and inflammation of the urethra (atrophic urethritis).
1,3,5-Trichloro-(2-methylsulfonyl)benzene is found in alcoholic beverages. 1,3,5-Trichloro-(2-methylsulfonyl)benzene is isolated from lettuce, potatoes and soil.
Stevioside is a constituent of Stevia rebaudiana (stevia). Sweetening agent which is 300 times sweeter than sucrose. Stevia rebaudiana is extensively cultivated in Japan, and Stevioside is a permitted sweetener in that country Rebaudioside B, D, and E may also be present in minute quantities; however, it is suspected that rebaudioside B is a byproduct of the isolation technique. The two majority compounds stevioside and rebaudioside, primarily responsible for the sweet taste of stevia leaves, were first isolated by two French chemists in 1931
Steviol is found in fruits. Steviol is isolated from Cucurbita maxima Rebaudioside B, D, and E may also be present in minute quantities; however, it is suspected that rebaudioside B is a byproduct of the isolation technique. The two majority compounds stevioside and rebaudioside, primarily responsible for the sweet taste of stevia leaves, were first isolated by two French chemists in 1931.
2-Pyrrolidinone is a lactam cyclization product of gamma-aminobutyric acid (GABA) (PMID 10332870). Vigabatrin (VGB, an antiepileptic drug) increases human brain gamma-aminobutyric acid (GABA) and the related metabolites, including 2-pyrrolidinone. Patients taking VGB are expected to have an increase of these metabolites (PMID 10403220, 10840398). 2-Pyrrolidone is an organic compound consisting of a five-membered lactam. It is a colorless liquid which is used in industrial settings as a high-boiling non-corrosive polar solvent for a wide variety of applications. It is miscible with a wide variety of other solvents including water, ethanol, diethyl ether, chloroform, benzene, ethyl acetate and carbon disulfide.
Ciclopirox is only found in individuals that have used or taken this drug. It is a synthetic antifungal agent for topical dermatologic use. [Wikipedia] Unlike antifungals such as itraconazole and terbinafine, which affect sterol synthesis, ciclopirox is thought to act through the chelation of polyvalent metal cations, such as Fe<sup>3+</sup> and Al<sup>3+</sup>. These cations inhibit many enzymes, including cytochromes, thus disrupting cellular activities such as mitochondrial electron transport processes and energy production. Ciclopirox also appears to modify the plasma membrane of fungi, resulting in the disorganization of internal structures. The anti-inflammatory action of ciclopirox is most likely due to inhibition of 5-lipoxygenase and cyclooxygenase. Ciclopirox may exert its effect by disrupting DNA repair, cell division signals and structures (mitotic spindles) as well as some elements of intracellular transport.
Alpha-Tetrasaccharide is a metabolite that accumulates in the urine of glucosidase I deficient patients, a defect due to missense mutations in the glucosidase I gene. (PMID 10788335). A tetrasaccharide is a carbohydrate which gives upon hydrolysis four molecules of the same or different monosaccharides. For example, stachyose upon hydrolysis gives one molecule each of glucose and fructose and two molecules of galactose. The general formula of a tetrasaccharide is typically C24H42O21. (Wikipedia).
Methylparaben, also known as methyl 4-hydroxybenzoate or p-carbomethoxyphenol, 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. Methylparaben is an antimicrobial agent, preservative, and flavouring agent. methylparaben has been detected, but not quantified, in a few different foods, such as alcoholic beverages, saffrons, and fruits (particularly blueberries). It is also a constituent of cloudberry, yellow passion fruit, white wine, botrytized wine, and Bourbon vanilla. Methylparaben is the most frequently used antimicrobial preservative in cosmetics.
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.
4-Hydroxychalcone is found in herbs and spices. 4-Hydroxychalcone is a constituent of Glycyrrhiza glabra (licorice) roots
Ethylphosphate is produced by the reaction between diethylphosphate and water, with ethanol as a byproduct.
alpha-Chaconine is found in potato. alpha-Chaconine is an alkaloid from Solanum chacoense and very many other Solanum species (Solanaceae
28-Glucosylarjunolate 3-[rhamnosyl-(1->3)-glucuronide] is found in cereals and cereal products. 28-Glucosylarjunolate 3-[rhamnosyl-(1->3)-glucuronide] is a constituent of Amaranthus cruentus (purple amaranth).
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.
Trifluridine is only found in individuals that have used or taken this drug. It is an antiviral derivative of thymidine used mainly in the treatment of primary keratoconjunctivitis and recurrent epithelial keratitis due to herpes simplex virus. (From Martindale, The Extra Pharmacopoeia, 30th ed, p557)The mechanism of action of trifluridine has not been fully determined, but appears to involve the inhibition of viral replication. Trifluridine does this by incorporating into viral DNA during replication, which leads to the formation of defective proteins and an increased mutation rate. This drug also reversibly inhibits thymidylate synthetase, an enzyme that is necessary for DNA synthesis.
[6]-Gingerdiol 4'-O-beta-D-glucopyranoside is found in herbs and spices. [6]-Gingerdiol 4'-O-beta-D-glucopyranoside is a constituent of ginger (Zingiber officinale) rhizomes
Butanal, also known as butyral or butyl aldehyde, belongs to the class of organic compounds known as alpha-hydrogen aldehydes. These are aldehydes with the general formula HC(H)(R)C(=O)H, where R is an organyl group. It is miscible with most organic solvents. Butanal exists in all living organisms, ranging from bacteria to humans. Upon prolonged exposure to air, butyraldehyde oxidizes to form butyric acid. Butanal is an apple, bready, and chocolate tasting compound. Outside of the human body, Butanal is found, on average, in the highest concentration within cow milk and carrots. Butanal has also been detected, but not quantified in several different foods, such as hard wheats, borages, ostrich ferns, skunk currants, and fennels. This could make butanal a potential biomarker for the consumption of these foods. The dominant technology involves the use of rhodium catalysts derived from the water-soluble ligand Tppts. Butyraldehyde is produced almost exclusively by the hydroformylation of propylene:CH3CHCH2 + H2 + CO → CH3CH2CH2CHO. Traditionally, hydroformylation was catalyzed by cobalt carbonyl and later rhodium complexes of triphenylphosphine. At one time, it was produced industrially by the catalytic hydrogenation of crotonaldehyde, which is derived from acetaldehyde. Butyraldehyde can be produced by the catalytic dehydrogenation of n-butanol. This compound is the aldehyde derivative of butane. An aqueous solution of the rhodium catalyst converts the propylene to the aldehyde, which forms a lighter immiscible phase. About 6 billion kilograms are produced annually by hydroformylation. It is a colourless flammable liquid with an unpleasant smell.
Decanal, also known as 1-decyl aldehyde or capraldehyde, belongs to the class of organic compounds known as medium-chain aldehydes. These are an aldehyde with a chain length containing between 6 and 12 carbon atoms. Thus, decanal is considered to be a fatty aldehyde lipid molecule. Decanal is a very hydrophobic molecule, practically insoluble in water, and relatively neutral. Decanal exists in all eukaryotes, ranging from yeast to humans. Decanal is a sweet, aldehydic, and citrus tasting compound. Decanal is found, on average, in the highest concentration within a few different foods, such as corianders, dills, and gingers and in a lower concentration in limes, sweet oranges, and safflowers. Decanal has also been detected, but not quantified, in several different foods, such as fishes, cauliflowers, citrus, fats and oils, and lemon grass. This could make decanal a potential biomarker for the consumption of these foods. Decanal is a potentially toxic compound. Decanal, with regard to humans, has been found to be associated with several diseases such as uremia, asthma, and perillyl alcohol administration for cancer treatment; decanal has also been linked to the inborn metabolic disorder celiac disease. Decanal occurs naturally and is used in fragrances and flavoring. Chronic exposure of uremic toxins can lead to a number of conditions including renal damage, chronic kidney disease and cardiovascular disease. Uremic toxins tend to accumulate in the blood either through dietary excess or through poor filtration by the kidneys.
Tetrahydroneopterin is a reduced form of neopterin.
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.
Leucylproline is a dipeptide composed of leucine 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).
2-Acetyl-4,5-dihydrothiazole is found in alcoholic beverages. 2-Acetyl-4,5-dihydrothiazole is reported in beef broth, roast beef and overpasteurized beer. Roasted meat-like flavour ingredient.
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.
PS(16:0/22:2(13Z,16Z)) 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(16:0/22:2(13Z,16Z)), in particular, consists of one chain of palmitic acid at the C-1 position and one chain of docosadienoic 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(18:1(9Z)/22:4(7Z,10Z,13Z,16Z)) 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(18:1(9Z)/22:4(7Z,10Z,13Z,16Z)), in particular, consists of one chain of oleic acid at the C-1 position and one chain of adrenic 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(18:1(9Z)/22:2(13Z,16Z)) 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(18:1(9Z)/22:2(13Z,16Z)), in particular, consists of one chain of oleic acid at the C-1 position and one chain of docosadienoic 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(20:2(11Z,14Z)/22:4(7Z,10Z,13Z,16Z)) 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(20:2(11Z,14Z)/22:4(7Z,10Z,13Z,16Z)), in particular, consists of one chain of eicosadienoic acid at the C-1 position and one chain of adrenic 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(22:2(13Z,16Z)/22:6(4Z,7Z,10Z,13Z,16Z,19Z)) 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(22:2(13Z,16Z)/22:6(4Z,7Z,10Z,13Z,16Z,19Z)), in particular, consists of one chain of docosadienoic acid at the C-1 position and one chain of docosahexaenoic 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.
PC(20:0/14:0) 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(20:0/14:0), in particular, consists of one chain of arachidic acid at the C-1 position and one chain of myristic acid at the C-2 position. The arachidic acid moiety is derived from peanut oil, 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.
Linalyl propionate is found in ginger. Linalyl propionate is found in lavender and sage oils in an enantiomeric form. Linalyl propionate is used in perfumery and food flavourin
N-Undecanoylglycine is an acylglycine with C-11 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.
all-trans-Retinoic acid is an isomer of retinoic acid, the oxidized form of vitamin A. Retinoic acid functions in determining position along embryonic anterior/posterior axis in chordates. It acts through Hox genes, which ultimately controls anterior/posterior patterning in early developmental stages (PMID:17495912). It is an important regulator of gene expression during growth and development, and in neoplasms. As a drug, all-trans-retinoic acid is known as tretinoin. Tretinoin is derived from maternal vitamin A and is essential for normal growth and embryonic development. An excess of tretinoin can be teratogenic. Tretinoin is used in the treatment of psoriasis, acne vulgaris, and several other skin diseases. It has also been approved for use in promyelocytic leukemia (leukemia, promyelocytic, acute).
Docosa-4,7,10,13,16-pentaenoyl 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.).
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.
LysoPC(18:1(9Z)) 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(18:19Z)), in particular, consists of one chain of oleic acid at the C-1 position. The oleic acid moiety, an omega-9 fatty acid, is derived from various animal and vegetable sources such as olive oil, acai and grapeseed oil. 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.
Platelet-activating factor, also known as PAF and PC(O-16:0/2:0), is a ubiquitous, potent phospholipid activator and mediator of inflammation that has an important role in the pathogenesis of inflammatory disorders and cardiovascular disease. PAF is able to cause platelet aggregation and anaphylaxis. PAF is synthesized continuously in low quantities in many different types of cells, but especially those involved in host defence, such as macrophages, monocytes, granulocytes, neutrophils, platelets, and endothelial cells. Platelet-activating factor receptor (PAFR) is a G-protein coupled receptor (GPCR) located on the cell membranes of a variety of cells. Once bound to its receptor, PAF mobilizes calcium and activates a wide range of signalling pathways (e.g. phospholipase C-mediated signalling (PMID: 26616844).
Vitamin D2 3-glucuronide is a natural human metabolite of Vitamin D2 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.
CerP(d18:1/16:0) is a ceramide 1-phosphate belonging to the sphingolipid class of molecules. Ceramides are amides of fatty acids with long-chain di- or trihydroxy bases, the commonest in animals being sphingosine and in plants phytosphingosine. The acyl group of ceramides is generally a long-chain saturated or monounsaturated fatty acid. The most frequent fatty acids found in animal ceramides are 18:0, 24:0 and 24:1(n-9). Ceramide 1-phosphates are produced by phosphorylation of ceramide by a specific ceramide kinase. Ceramide-1-phosphate was shown to be a specific and potent inducer of arachidonic acid and prostanoid synthesis in cells through the translocation and activation of the cytoplasmic phospholipase A2.
PE(16:1(9Z)/16:1(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(16:1(9Z)/16:1(9Z)), in particular, consists of two chains of palmitoleic acid at the C-1 and C-2 positions. The palmitoleic acid moieties are 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. 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(9Z)/18:0) 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(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. 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(16:1(9Z)/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(16:1(9Z)/22:6(4Z,7Z,10Z,13Z,16Z,19Z)), in particular, consists of one chain of palmitoleic acid at the C-1 position and one chain of docosahexaenoic acid at the C-2 position. The palmitoleic acid moiety is derived from animal fats and vegetable oils, 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.
3-Oxotetradecanoyl-CoA is a product of the peroxisomal beta oxidation of hexadenoic acid by the enzyme acyl-CoA oxidase which results in long-chain 3-oxoacyl-CoA-esters. (PMID: 7548202). Myristoyl-CoA:protein N-myristoyltransferase (E.C. 2.3.1.97) is a eukaryotic enzyme that catalyzes the transfer of myristate (C14:O) from myristoyl-CoA to the amino nitrogen of glycine. This covalent protein modification occurs cotranslationally, is apparently irreversible, and affects proteins with diverse functions. (PMID: 2818568).
LysoPC(20:4(5Z,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(20:4(5Z,8Z,11Z,14Z)), in particular, consists of one chain of arachidonic acid at the C-1 position. The arachidonic acid moiety is derived from animal fats and eggs. 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.
DG(18:3(9Z,12Z,15Z)/20:3(8Z,11Z,14Z)/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(18:3(9Z,12Z,15Z)/20:3(8Z,11Z,14Z)/0:0), in particular, consists of one chain of a-linolenic acid at the C-1 position and one chain of homo-g-linolenic acid at the C-2 position. The a-linolenic acid moiety is derived from seed oils, especially canola and soybean oil, while the homo-g-linolenic acid moiety is derived from fish oils, liver and kidney. 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.
PE(14:1(9Z)/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(14:1(9Z)/15:0), in particular, consists of one chain of myristoleic acid at the C-1 position and one chain of pentadecanoic acid at the C-2 position. The myristoleic acid moiety is derived from milk fats, 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.
2-(9Z,12Z-octadecadienoyl)-1-(1Z-hexadecenyl)-sn-glycero-3-phosphate is an intermediate of ether lipid metabolism. 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. 2-(9Z,12Z-octadecadienoyl)-1-(1Z-hexadecenyl)-sn-glycero-3-phosphate is irreversibly produced from 2-(9Z,12Z-octadecadienoyl)-1-(1Z-hexadecenyl))-sn-glycero-3-phosphoethanolamine via the enzyme phospholipase D (EC: 3.1.4.4). 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.
PC(14:0/14:1(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(14:0/14:1(9Z)), in particular, consists of one chain of myristic acid at the C-1 position and one chain of myristoleic acid at the C-2 position. The myristic acid moiety is derived from nutmeg and butter, 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.
DG(22:4(7Z,10Z,13Z,16Z)/22:5(4Z,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(22:4(7Z,10Z,13Z,16Z)/22:5(4Z,7Z,10Z,13Z,16Z)/0:0), in particular, consists of one chain of adrenic acid at the C-1 position and one chain of docosapentaenoic acid at the C-2 position. The adrenic acid moiety is derived from animal fats, while the docosapentaenoic acid moiety is derived from animal fats and brain. 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(14:0/18:2(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(14:0/18:2(9Z,12Z)), in particular, consists of one chain of myristic acid at the C-1 position and one chain of linoleic acid at the C-2 position. The myristic acid moiety is derived from nutmeg and butter, 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-16:0/20:5(5Z,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-16:0/20:5(5Z,8Z,11Z,14Z,17Z)), in particular, consists of one chain of palmityl alcohol at the C-1 position and one chain of eicosapentaenoic 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-16:0/20:5(5Z,8Z,11Z,14Z,17Z)) is found in crustaceans and has been isolated from the Japanese oyster Crassostrea gigas.
PC(16:0/20:3(5Z,8Z,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(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. 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(16:1(9Z)/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(16:1(9Z)/22:6(4Z,7Z,10Z,13Z,16Z,19Z)), in particular, consists of one chain of palmitoleic acid at the C-1 position and one chain of docosahexaenoic acid at the C-2 position. The palmitoleic acid moiety is derived from animal fats and vegetable oils, 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(16:0/22:5(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(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. 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)/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(18:2(9Z,12Z)/22:6(4Z,7Z,10Z,13Z,16Z,19Z)), in particular, consists of one chain of linoleic acid at the C-1 position and one chain of docosahexaenoic acid at the C-2 position. The linoleic acid moiety is derived from seed oils, 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.
PS(20:0/22:4(7Z,10Z,13Z,16Z)) 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(20:0/22:4(7Z,10Z,13Z,16Z)), in particular, consists of one chain of arachidic acid at the C-1 position and one chain of adrenic 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.
PE(DiMe(11,5)/MonoMe(13,5)) 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(11,5)/MonoMe(13,5)), 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 14,17-epoxy-15,16-dimethyldocosa-14,16-dienoic at the C-2 position. The 12,15-epoxy-13,14-dimethyleicosa-12,14-dienoic moiety is derived from fish oil, while the 14,17-epoxy-15,16-dimethyldocosa-14,16-dienoic moiety is derived from X. 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.
DG(16:0/0:0/18:0) 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 the C-1, C-2, or C-3 positions. DG(16:0/0:0/18:0), in particular, consists of one chain of palmitic acid at the C-1 position and one chain of stearic acid at the C-3 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. 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.<br />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.<br />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-3 position.
PA(14:1(9Z)/18:4(6Z,9Z,12Z,15Z)) 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(14:1(9Z)/18:4(6Z,9Z,12Z,15Z)), in particular, consists of one chain of myristoleic acid at the C-1 position and one chain of stearidonic acid at the C-2 position. Phosphatidic acids are quite rare but are extremely important as intermediates in the biosynthesis of triacylglycerols and phospholipids.
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
Symmetric dimethylarginine, also known as N,n'-dimethylarginine or SDMA, is a L-arginine derivative having two methyl groups at the N(omega)- and N'(omega)-positions It has a role as an EC 1.14.13.39 (nitric oxide synthase) inhibitor. It is a member of guanidines, a non-proteinogenic L-alpha-amino acid, a L-arginine derivative and a dimethylarginine. It is a tautomer of a N(omega),N'(omega)-dimethyl-L-arginine zwitterion. It belongs to the class of organic compounds known as arginine and derivatives. Arginine and derivatives are compounds containing arginine or a derivative thereof resulting from reaction of arginine at the amino group or the carboxy group, or from the replacement of any hydrogen of glycine by a heteroatom. Symmetric dimethylarginine is a drug. Outside of the human body, symmetric dimethylarginine has been detected, but not quantified in pulses. Symmetric dimethylarginine (SDMA) is an endogenously produced inhibitor of nitric oxide synthase (EC-Number 1.14.13.39). However, elevated levels of Symmetric dimethylarginine occur in patients with vascular disease, especially suffering end-stage renal disease.
Malonic acid (IUPAC systematic name: propanedioic acid) is a dicarboxylic acid with structure CH2(COOH)2. The ionised form of malonic acid, as well as its esters and salts, are known as malonates. For example, diethyl malonate is malonic acid's ethyl ester. The name originates from Latin malum, meaning apple. Malonic acid is the archetypal example of a competitive inhibitor: it acts against succinate dehydrogenase (complex II) in the respiratory electron transport chain. Malonic acid is found to be associated with malonyl-CoA decarboxylase deficiency, which is an inborn error of metabolism.
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).
2-Deoxygalactopyranose is an optical isomer of 2-deoxyglucose, which has the 2-hydroxyl group replaced by hydrogen. 2-deoxygalactose inhibits galactose uptake and oxidation in galactose-grown cells. Similar to galactose,. 2-deoxyglucose, and D-fucose, 2-deoxygalactose induces uptake of H+ when the sugar is added to anaerobic wild-type cells that contain the galactose transport system, whereas the maximal rate of uptake is one-half to one-third of that of galactose. 2-Deoxygalactose is a specific substrate of the galactose permease. None of the other galactose transport systems, including methyl beta-D-thiogalactosides I and II, the beta-methyl-galactoside permease, and both arabinose systems, is able to catalyze transport of 2-deoxygalactose to a significant extent. 2-Deoxygalactose can also be used to isolate mutants defective in galactose permease, since it is bacteriostatic.
Mesitylene or 1,3,5-trimethylbenzene is a derivative of benzene with three methyl substituents symmetrically placed on the ring. Isomeric trimethylbenzenes include hemimellitene (1,2,3-trimethylbenzene) and pseudocumene (1,2,4-trimethylbenzene). All three compounds have the formula C6H3(CH3)3, which is commonly abbreviated C6H3Me3. Mesitylene is a colourless liquid with sweet aromatic odor. It is a component of coal tar, which is its traditional source. It is a precursor to diverse fine chemicals. The mesityl group (Mes) is a substituent with the formula C6H3Me3.
Eicosane, also known as CH3-[CH2]18-CH3 or octyldodecane, 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. Eicosane is a very hydrophobic molecule, practically insoluble in water, and relatively neutral. Thus, eicosane is considered to be a hydrocarbon lipid molecule. Eicosane is an alkane and waxy tasting compound. Eicosane is found, on average, in the highest concentration within lemon balms. Eicosane has also been detected, but not quantified, in several different foods, such as allspices, papaya, coconuts, lindens, and hyssops. This could make eicosane a potential biomarker for the consumption of these foods. These are acyclic hydrocarbons consisting only of n carbon atoms and m hydrogen atoms where m=2*n + 2.
Carbetocin is only found in individuals that have used or taken this drug. It is a drug used to control postpartum hemorrhage, bleeding after giving birth. It is an analogue of oxytocin, and its action is similar to that of oxytocin, it causes contraction of the uterus.Carbetocin binds to oxytocin receptors present on the smooth musculature of the uterus, resulting in rhythmic contractions of the uterus, increased frequency of existing contractions, and increased uterine tone. The oxytocin receptor content of the uterus is very low in the non-pregnant state, and increases during pregnancy, reaching a peak at the time of delivery.
Tioconazole is an antifungal medication of the Imidazole class used to treat infections caused by a fungus or yeast. Tioconazole topical (skin) preparations are also available for ringworm, jock itch, athlete's foot, and tinea versicolor or 'sun fungus'. Tioconazole interacts with 14-alpha demethylase, a cytochrome P-450 enzyme that converts lanosterol to ergosterol, an essential component of the yeast membrane. In this way, tioconazole inhibits ergosterol synthesis, resulting in increased cellular permeability.
N,N-Diethylbenzeneacetamide is found in green vegetables. N,N-Diethylbenzeneacetamide is found in various plant oils, e.g. garden cress (Lepidium sativum
Limonin is found in citrus. Limonin is isolated from oranges and other citrus fruits (Citrus species). Limonin is a limonoid, and a bitter, white, crystalline substance found in orange and lemon seeds. It is also known as limonoate D-ring-lactone and limonoic acid di-delta-lactone. Chemically, it is a member of the class of compounds known as furanolactones
Liquiritigenin is found in alfalfa. Liquiritigenin is isolated from Glycyrrhiza, Medicago, Myroxylon, Cicer, and all Leguminosae species. Several glycosides, particularly rutinoside and neohesperidoside, are important in influencing citrus fruit flavour.
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).
Colourant for orange skins. Allowed on fruit which is not to be processed. Use prohibited in orange peel for human consumption.
Suxibuzone is a drug used for joint and muscular pain. It is a prodrug of the non steroidal anti inflammatory drug phenylbutazone, and is commonly used in horses.
Ionophore effective against viruses and particularly against coccidial infections in chicken
Ginsenoside Rb1 is found in tea. Ginsenoside Rb1 is a constituent of Panax ginseng (ginseng)
Sinigrin is found in brassicas. Sinigrin is isolated from seeds of black mustard (Brassica nigra) and cabbage, as K salt. Sinigrin is present in many crucifers, major glucosinolate in Brussels sprouts (Brassica oleraceae).
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).
N tau-methylhistamine is one of the histamine metabolites. N tau-methylhistamine in plasma and urine is a good parameter for histamine release, and the determination of this histamine metabolite is generally less hampered by possible artifacts (due to basophil disrupture, a very short half-life time or bacterial production) than determinations of histamine itself (PMID 2409780).
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).
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.
Liqcoumarin is found in herbs and spices. Liqcoumarin is isolated from Glycyrrhiza glabra (licorice
Methaqualone, also known as optimil or ortonal, belongs to the class of organic compounds known as quinazolines. Quinazolines are compounds containing a quinazoline moiety, which is made up of two fused six-member aromatic rings, a benzene ring and a pyrimidine ring. Methaqualone is a drug which is used for the treatment of insomnia, and as a sedative and muscle relaxant. Methaqualone exists as a solid and is considered to be practically insoluble (in water) and relatively neutral.
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.
1,2-Dibromoethane, also known as ethylene dibromide or DBE, belongs to the class of organic compounds known as organobromides. Organobromides are compounds containing a chemical bond between a carbon atom and a bromine atom. 1,2-Dibromoethane is possibly neutral. Trace amounts of 1,2-dibromoethane occur naturally in the ocean, where it is formed probably by algae and kelp. 1,2-Dibromoethane is formally rated as a probable carcinogen (by IARC 2A) and is also a potentially toxic compound. Breathing high levels may cause depression and collapse. 1,2-Dibromoethane is rapidly absorbed by ingestion, inhalation, and dermal routes, then distributed mainly to the kidneys, liver, and spleen.  It can be metabolized by either the cytochrome P-450 system or the glutathione S-transferase system. These metabolites may be further broken down and excreted in the urine. The metabolite 2-bromoacetaldehyde produces liver damage by binding to cellular proteins. Long term exposure can result in liver, kidney, and reproductive system damage. 1,2-Dibromoethane is also known to have adverse effects on the brain. S-(2-bromoethyl)glutathione, another metabolite, exerts genotoxic and carcinogenic effects by binding to DNA.
Phenytoin catechol is a metabolite of phenytoin. Phenytoin sodium is a commonly used antiepileptic. Phenytoin acts to suppress the abnormal brain activity seen in seizure by reducing electrical conductance among brain cells by stabilizing the inactive state of voltage-gated sodium channels. Aside from seizures, it is an option in the treatment of trigeminal neuralgia in the event that carbamazepine or other first-line treatment seems inappropriate. It is sometimes considered a class 1b antiarrhythmic. (Wikipedia)
Plant growth regulator. (2-Naphthalenyloxy)acetic acid is used for control of preharvest fruit drop especially on grapes, pineapples, strawberries and tomatoe
Cholesteryl lauric 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). Lauric acid greatly increases total cholesterol, but much of its effect is on HDL cholesterol. Consequently, oils rich in lauric acid decrease the ratio of total to HDL cholesterol. (PMID:12716665, 8644684, 10030391).
Vitamin A2 aldehyde is found in fishes. Vitamin A2 aldehyde is a constituent fish of liver oils
Consumption of broccoli sprouts has shown to be effective at inhibiting Helicobacter pylori growth with sulforaphane being at least one of the active agents. Sulforaphane is an anticancer and antimicrobial compound which can 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. The enzyme myrosinase transforms glucoraphanin (a glucosinolate) into sulforaphane upon damage to the plant (such as from chewing). The young sprouts of broccoli and cauliflower are particularly rich in glucoraphanin.
7-aminonitrazepam belongs to the family of Benzodiazepines. These are organic compounds containing a benzene ring fused to either isomers of diazepine(unsaturated seven-member heterocycle with two nitrogen atoms replacing two carbon atoms).
Lipopolysaccharides (LPS), also known as lipoglycans, are large molecules consisting of a lipid and a polysaccharide joined by a covalent bond; they are found in the outer membrane of Gram-negative bacteria, act as endotoxins and elicit strong immune responses in animals. LPS is the major component of the outer membrane of Gram-negative bacteria, contributing greatly to the structural integrity of the bacteria, and protecting the membrane from certain kinds of chemical attack. LPS also increases the negative charge of the cell membrane and helps stabilize the overall membrane structure. It is of crucial importance to gram negative bacteria, whose death results if it is mutated or removed. LPS is an endotoxin, and induces a strong response from normal animal immune systems. LPS acts as the prototypical endotoxin because it binds the CD14/TLR4/MD2 receptor complex, which promotes the secretion of pro-inflammatory cytokines in many cell types, but especially in macrophages. In Immunology, the term "LPS challenge" refers to the process of exposing a subject to an LPS which may act as a toxin. LPS is also an exogenous pyrogen (external fever-inducing substance). Being of crucial importance to gram negative bacteria, these molecules make candidate targets for new antimicrobial agents. LPS comprises three parts: 1. O antigen (or O polysaccharide). 2. Core polysaccharide. 3. Lipid A. LPS Core domain always contains an oligosaccharide component which attaches directly to lipid A and commonly contains sugars such as heptose and 3-deoxy-D-mannooctulosonic Acid (also known as KDO, keto-deoxyoctulosonate).[2] The LPS Cores of many bacteria also contain non-carbohydrate components, such as phosphate, amino acids, and ethanolamine substitutents.(from wiki). This card shows the LPS core component in E.coli.  LPS core has also been found in Pseudomonas and Salmonella (PMID: 9791168) (Wikipedia).
16-Dehydroprogesterone, also known as delta.16-progesterone, belongs to the class of organic compounds known as 20-oxosteroids. These are steroid derivatives carrying a C=O group at the 20-position of the steroid skeleton. Thus, 16-dehydroprogesterone is considered to be a steroid lipid molecule. 16-Dehydroprogesterone is a very hydrophobic molecule, practically insoluble in water, and relatively neutral.
Cefonicid is only found in individuals that have used or taken this drug. It is a second-generation cephalosporin administered intravenously or intramuscularly. It is used for urinary tract infections, lower respiratory tract infections, and soft tissue and bone infections. [PubChem]Cefonicid, like the penicillins, is a beta-lactam antibiotic. By binding to specific penicillin-binding proteins (PBPs) located inside the bacterial cell wall, it 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.
Ethyl propanoate, also known as fema 2456, 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 propanoate exists as a solid. It is very hydrophobic, practically insoluble in water, and a relatively neutral molecule. Ethyl propanoate exists in all eukaryotes, ranging from yeast to humans. Ethyl propanoate has been found to be associated with several known diseases as autism, irritable bowel syndrome, ulcerative colitis, and nonalcoholic fatty liver disease; also ethyl propanoate has been linked to the inborn metabolic disorders including celiac disease. As a volatile organic compound, ethyl propionate has been identified as a fecal biomarker of Clostridium difficile infection (PMID:30986230).
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.
Dimethyl selenide is found in onion-family vegetables. Dimethyl selenide is a constituent of Allium species.
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).
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.
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).
Temurin is a methyl derivative of uric acid, found occasionally in human urine. Temurin 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. (PMID: 11712316, 15833286, 3506820, 15013152).
8-hydroxyguanosine (8-OHG) is a marker for measuring the rate of oxidative damage to nucleic acids and lipids. Production of reactive oxygen species (ROS) damage proteins, lipid membranes, and nucleic acids (DNA and RNA), all critical functional components of living cells. The progressive accumulation of unrepaired free radical damage over time is believed to be a major contributor to the aging process and to a variety of age-related chronic diseases. Generation of most free radicals is a 'side effect' of normal metabolic processes, especially mitochondrial production of ROS, including superoxide anion, hydrogen peroxide, and hydroxyl radical, coincident to oxidative metabolism. (PMID 14607529). 8-OHG (marker of oxidative damage to RNA) was found in the cerebral cortex in three of six cases of neuropathologically examined autopsy of subacute sclerosing panencephalitis patients. Subacute sclerosing panencephalitis is caused by persistent brain infection of mutated measles virus, showing inflammation, neuronal loss, and demyelination. (PMID 12546425). The concentration of 8-OHG in CSF in Parkinson's disease (PD) patients is approximately three-fold that in controls. The concentration of 8-OHG in CSF decreased significantly with the duration of disease. However, the concentration of 8-OHG in serum was not significantly altered in PD patients compared to that in controls. (PMID 12499051).
3-Methoxybenzoic acid is a flavouring ingredient for foods. 3-Methoxybenzoic acid is a food additive listed in the EAFUS food Additive Database (Jan. 2001
m-Aminobenzoic acid (also known as 3-aminobenzoic acid or MABA) is an organic compound with the molecular formula H2NC6H4CO2H. MABA is a white solid, although commercial samples are often colored. It is only slightly soluble in water. It is soluble in acetone, boiling water, hot alcohol, hot chloroform and ether. It consists of a benzene ring substituted with an amino group and a carboxylic acid. m-Aminobenzoic acid belongs to the class of organic compounds known as aminobenzoic acids. These are benzoic acids containing an amine group attached to the benzene moiety. Outside of the human body, m-Aminobenzoic acid has been detected, but not quantified in cow milk. This could make m-aminobenzoic acid a potential biomarker for the consumption of these foods.
Dihydropteridine is a generic compound; the product of the reduction of 5,6,7,8-Tetrahydropteridine, which is catalyzed by 6,7-dihydropteridine reductase (EC 1.5.1.34). (KEGG) This compound is recognised as a cause of tetrahydrobiopterin (BH(4)) deficiency, leading to hyperphenylalaninemia (HPA) and impaired biogenic amine deficiency. (PMID: 14705166).
4-Aminobutyraldehyde is a metabolite of putrescine. It is a substrate of human liver aldehyde dehydrogenase (EC 1.2.1.3) cytoplasmic (E1) and mitochondrial (E2) isozymes (PMID 3324802).
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).
Indomethacin acyl glucuronide is a metabolite of indomethacin. Indometacin or indomethacin (USAN and former BAN) is a non-steroidal anti-inflammatory drug (NSAID) commonly used as a prescription medication to reduce fever, pain, stiffness, and swelling. It works by inhibiting the production of prostaglandins, molecules known to cause these symptoms. It is marketed under more than seventy different trade names. (Wikipedia)
1,3-Diacetylpropane is an acetylated polyamine that can be found in urine.
In humans, CITA is metabolized to demethylcitalopram (DCITA) by CYP2C19, CYP2D6, and CYP3A and to didemethylcitalopram by CYP2D6. (PMID: 19011672)  The major metabolite of citalopram is demethylcitalopram, which is subsequently metabolized to the minor metabolite didemethylcitalopram (DDCT). (PMID: 22085614)
Citalopram propionic acid is a metabolite of citalopram. Citalopram is an antidepressant drug of the selective serotonin reuptake inhibitor (SSRI) class. It has U.S. Food and Drug Administration (FDA) approval to treat major depression, and is prescribed off-label for a number of anxiety conditions. (Wikipedia)
3,4-Methylenedioxybenzaldehyde is found in highbush blueberry. 3,4-Methylenedioxybenzaldehyde is a flavouring agent used in cherry and vanilla flavour
N-Acetyl-b-D-galactosamine is an oligosaccharide residue found in the lining and glandular epithelium, the stroma and the vessels (capillary and large vessels of the human postmenopausal endometrium. (PMID: 8930627). It is suspected that N-Acetyl-b-D-galactosamine is a molecule that binds to IgA in the glomerular mesangium in Henoch-Schoenlein purpura associated nephropathy (the most common vasculitis of childhood). (PMID: 10732728).
5-Diphosphomevalonic acid (CAS: 1492-08-6) is a metabolic intermediate in the mevalonate pathway, catalyzed by the enzyme phosphomevalonate kinase from 5-phosphomevalonate (Wikipedia).
Pergolide is a long-acting dopamine agonist approved in 1982 for the treatment of Parkinson's Disease. It is an ergot derivative that acts on the dopamine D2 and D3, alpha2- and alpha1-adrenergic, and 5-hydroxytryptamine (5-HT) receptors. It was indicated as adjunct therapy with levodopa/carbidopa in the symptomatic treatment of parkinsonian syndrome. It was later found that pergolide increased the risk of cardiac valvulopathy. The drug was withdrawn from the US market in March 2007 and from the Canadian market in August 2007.
(-)-alpha-Narcotine is found in opium poppy. (-)-alpha-Narcotine is an alkaloid from Papaver somniferum (opium poppy).Noscapine (also known as Narcotine, Nectodon, Nospen, and Anarcotine) is a benzylisoquinoline alkaloid from plants of the Papaveraceae family, without significant painkilling properties. This agent is primarily used for its antitussive (cough-suppressing) effects. It has also been shown to have anticancer activity. (Wikipedia).
Pterostilbene is a member of the class of compounds known as stilbenes. Stilbenes are organic compounds containing a 1,2-diphenylethylene moiety. Stilbenes (C6-C2-C6 ) are derived from the common phenylpropene (C6-C3) skeleton building block. The introduction of one or more hydroxyl groups to a phenyl ring lead to stilbenoids. Pterostilbene is practically insoluble (in water) and a very weakly acidic compound (based on its pKa). Pterostilbene can be found in common grape and grape wine, which makes pterostilbene a potential biomarker for the consumption of these food products. Pterostilbene is a stilbenoid chemically related to resveratrol. In plants, it serves a defensive phytoalexin role .
Phenethyl 6-galloylglucoside is found in green vegetables. Phenethyl 6-galloylglucoside is isolated from Rosa damascena (damask rose
1-Methylnaphthalene is found in black walnut. 1-Methylnaphthalene is a flavouring ingredient.
Desacetylcefotaxime belongs to the family of Cephems. These are organic compounds containing the 5-thia-1-azabicyclo[4.2.0]oct-2-en-8-one nucleus[1].
Cardiac dysrhythmia is a heart rate disorder that manifests as an altered cardiac rhythm. It results from either abnormal pacemaker activity or a disturbance in impulse propagation, or both. Arrhythmias can be caused by various conditions including ischemia, hypoxia, pH disruptions, B adrenergic activation, drug interactions or the presence of diseased tissue. These events can trigger the development of ectopic pacemaker in the heart, which emit abnormal impulses at random times during the cardiac cycle. An arrhythmia can present itself as either bradycardia or tachycardia. Untreated arrhythmias may progress to atrial fibrillation or ventricular fibrillation. Treatment is aimed at normalizing cardiac rhythm by altering ion flow across the membrane. Antiarrhythmic agents can reduce arrhythmia related symptoms such as palpitations or syncope; however, they often have a narrow therapeutic index and can also be proarrhythmic. Lorcainide (Lorcainide hydrochloride) is a Class 1c antiarrhythmic agent that is used to help restore normal heart rhythm and conduction in patients with premature ventricular contractions, ventricular tachycardiac and Wolff-Parkinson-White syndrome. Lorcainide was developed by Janssen Pharmaceutica (Belgium) in 1968 under the commercial name Remivox and is designated by code numbers R-15889 or Ro 13-1042/001. It has a half-life of 8.9 +- 2.3 hrs which may be prolonged to 66 hrs in people with cardiac disease. Wolff-Parkinson-White syndrome (WPW) is a pre-excitation syndrome in which individuals are predisposed to supraventricular tachyarrhythmias (rapid and irregular heart beats). People with this condition have an extra or accessory atrioventricular conduction pathway that causes re-entry tachycardia. WPW is characterized by a short PR interval (&lt;0.12 second) and a prolonged, slurred QRS complex (&gt;0.12 seconds).
L-Phosphoarginine is found in crustaceans. L-Phosphoarginine is a constituent of crayfish muscle
18-Oxocortisol shares structural characteristics with cortisol and aldosterone and is secreted from the adrenal cortex. The plasma levels of 18-Oxocortisol are significantly higher in patients with adrenocortical disorders than in control subjects. (PMID 8013138).
Alpha-zearlenol 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, alpha-zearalenol is a widely distributed compound that contaminates many crops, grains, and other commodities (PMID: 30830360). Alpha-zearalenol, is also a major hepatic metabolite of zearalenone (another mycotoxin). Zearalenone has two metabolites, alpha and beta zearalenol which are produced in the liver by 3α-hydroxisteroid dehydrogenase and 3β-hydroxisteroid dehydrogenase (PMID: 30830360). Like Alpha-zearlenol, zearalenone or F-2 mycotoxin is produced by certain Fusarium species. It causes infertility, abortion and other breeding problems in swine. Alpha-zearlenol is also produced synthetically and sold as Zeranol, which is used as an anabolic agent for cattle. Alpha-zearlenol exhibits strong growth-promoting properties, but its sale is restricted in Europe (PMID: 22095651). Alpha-zearalenol has three to four times the biological activity of zearalenone.  Alpha-zearlenol 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).
The formation of docosahexaenoic acid(DHA) involves the production of tetracosahexaenoic acid C24:6n-3) from dietary linolenic acid (C18:3n-3) via a series of elongation and desaturation reactions, followed by beta-oxidation of C24:6n-3 to C22:6n-3. DHA is deficient in patients lacking peroxisomes.(PMID: 11734571).
Carveol is a natural terpenoid alcohol that is a constituent of spearmint oil. It has an odor and flavor that resemble those of spearmint and caraway. Consequently, it is used as a fragrance in cosmetics and as a flavor additive in the food industry.
Geranial, also known as 3,7-dimethyl-2,6-octadienal, citral or lemonal, belongs to the class of organic compounds known as acyclic monoterpenoids. These are monoterpenes that do not contain a cycle. Thus, citral is considered to be an isoprenoid lipid. Two different isomers of 3,7-dimethyl-2,6-octadienal exist. The E-isomer or trans-isomer is known as geranial or citral A. The Z-isomer or cis-isomer is known as neral or citral B. 3,7-dimethyl-2,6-octadienal is a very hydrophobic molecule, practically insoluble in water, and relatively neutral. Citral is present in the oils of several plants, including lemon myrtle (90-98%), Litsea citrata (90%), Litsea cubeba, lemongrass (65-80%), lemon tea-tree (70-80%), Ocimum gratissimum, Lindera citriodora, Calypranthes parriculata, petitgrain, lemon verbena, lemon ironbark, lemon balm, lime, lemon and orange. Citral has also been reported to be found in Cannabis sativa (PMID:6991645 , 26657499 ). Citral has a strong lemon (citrus) odor. Neral's lemon odor is less intense, but sweeter. Citral is therefore an aroma compound used in perfumery for its citrus effect. Citral is also used as a flavor and for fortifying lemon oil. It has strong antimicrobial qualities (PMID:28974979 ) and pheromonal effects in nematodes and insects (PMID:26973536 ). Citral is used in the synthesis of vitamin A, lycopene, ionone, and methylionone (a compound used to mask the smell of smoke).
Dopamine glucuronide is a natural human metabolite of Dopamine 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'-Monoiodo-L-thyronine, also known as 3'-Iodothyronine, belongs to the class of organic compounds known as phenylalanine and derivatives. Phenylalanine and derivatives 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. 3'-Monoiodo-L-thyronine is a very strong basic compound (based on its pKa).
Analysis of sequential bile samples by thin-layer chromatography (TLC) demonstrated that lithocholic acid glucuronide was present in bile throughout the course of the experiments and that its secretion rate paralleled that of total isotope secretion. Initial confirmation of the identity of this metabolite was obtained by the recovery of labeled lithocholic acid after beta-glucuronidase hydrolysis of bile samples. Glucuronates; Lithocholic Acid.
Ethyl oleate is found in sweet marjoram. Ethyl oleate is a flavouring ingredient.Ethyl oleate is the ester formed by the condensation of the fatty acid oleic acid and ethanol. It is a colorless to light yellow liquid. Ethyl oleate is produced by the body during ethanol intoxication
Tarasaponin II is found in green vegetables. Tarasaponin II is a constituent of Aralia elata (Japanese angelica tree).
beta-Geraniol, also known as (E)-nerol, the isomer of nerol (or geranyl alcohol, is a monoterpenoid alcohol. It belongs to the class of organic compounds known as acyclic monoterpenoids. These are monoterpenes that do not contain a cycle. 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 the 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. beta-Geraniol is an isoprenoid lipid molecule that is very hydrophobic, practically insoluble in water, and relatively neutral. beta-Geraniol has a sweet, citrus, and floral taste. beta-Geraniol is found in highest concentrations in common grapes, black walnuts, and common thymes and in lower concentrations in cardamoms, common oregano, and gingers. beta-Geraniol has also been detected in lemon verbena, oval-leaf huckleberries, common pea, sweet cherries, and nopals. This could make beta-geraniol a potential biomarker for the consumption of these foods. It is found in as an alcohol and as its ester in many essential oils including geranium oil. It is the primary part of rose oil, palmarosa oil, and citronella oil (Java type) and occurs in small quantities in geranium, lemon, and many other essential oils. Geraniol is a monoterpenoid and an alcohol found in cannabis plants (PMID:6991645 ). Because it has a rose-like odor, it is commonly used in perfumes. It is used to create flavors such as peach, raspberry, grapefruit, red apple, plum, lime, orange, lemon, watermelon, pineapple, and blueberry. Geraniol is produced by the scent glands of honeybees to mark nectar-bearing flowers and locate the entrances to their hives (http//doi:10.1051/apido:19900403).
Silidianin is found in coffee and coffee products. Silidianin is a constituent of Silybum marianum (milk thistle)
Isosilybin is found in coffee and coffee products. Isosilybin is a constituent of Silybum marianum (milk thistle)
Propiverine is an anticholinergic drug used for the treatment of urinary urgency, frequency and urge incontinence, all symptoms of overactive bladder syndrome. A modified release preparation is also available, taken once daily.
Thiodiacetic acid belongs to the family of Thiodiacetic Acid Derivatives. These are compounds containing a thiodiacetic acid group (or esters/salts thereof) which is made up of two 2-sulfanylacetic (OC(=O)CS) acid moieties sharing their sulfur atom.
N5-Acetyl-N2-gamma-L-glutamyl-L-ornithine is found in pulses. N5-Acetyl-N2-gamma-L-glutamyl-L-ornithine is a constituent of the seeds of green gram (Vigna radiata).
2-Methylacetophenone belongs to the class of organic compounds known as alkyl-phenylketones. These are aromatic compounds containing a ketone substituted by one alkyl group and a phenyl group. 2-Methylacetophenone is an extremely weak basic (essentially neutral) compound (based on its pKa). 2-Methylacetophenone is used as a food additive (EAFUS: Everything Added to Food in the United States).
Spermine dialdehyde,an oxidized product of spermine, is a novel ex vivo purging agent for both allogeneic and autologous bone marrow transplantations It has been identified as the immunosuppressive agent "SAF" (suppressor activation factor) present in the supernatant of amutant cell line [PMID: 1428363].
Indoxyl, also known as 1H-indol-3-ol, belongs to the class of organic compounds known as hydroxyindoles. These are organic compounds containing an indole moiety that carries a hydroxyl group. Indoxyl is isomeric with oxindol and is obtained as an oily liquid. Indoxyl exists in all living organisms, ranging from bacteria to humans. Indoxyl is obtained from indican, which is a glycoside. Obermayer's reagent is a dilute solution FeCl3 in hydrochloric acid. The hydrolysis of indican yields β-D-glucose and indoxyl. Indigo dye is a product of the reaction of indoxyl by a mild oxidizing agent such as atmospheric oxygen. In chemistry, indoxyl is a nitrogenous substance with the chemical formula: C8H7NO. Indoxyl can be found in urine and is titrated with Obermayer's reagent.
A semisynthetic derivative of podophyllotoxin that exhibits antitumor activity. Teniposide inhibits DNA synthesis by forming a complex with topoisomerase II and DNA. This complex induces breaks in double stranded DNA and prevents repair by topoisomerase II binding. Accumulated breaks in DNA prevent cells from entering into the mitotic phase of the cell cycle, and lead to cell death. Teniposide acts primarily in the G2 and S phases of the cycle. [PubChem]
Baptifoline is found in coffee and coffee products. Baptifoline is an alkaloid from Caulophyllum thalictroides (blue cohosh).
P1,P4-Bis(5'-adenosyl) tetraphosphate is an intermediate in purine metabolism. P1,P4-Bis(5'-adenosyl) tetraphosphate is the first to last step in the synthesis of adenosine 5'-triphosphate (ATP) and is converted from adenosine 5'-phosphosulfate via the enzyme ATP adenylyltransferase (EC 2.7.7.53).
3'-Hydroxyhexobarbital is only found in individuals that have used or taken Hexobarbital. 3'-Hydroxyhexobarbital is a metabolite of Hexobarbital. 3'-hydroxyhexobarbital belongs to the family of Barbituric Acid Derivatives. These are compounds containing a perhydropyrimidine ring substituted at C-2, -4 and -6 by oxo groups.
13-Hydroxyoctadecadienoic acid (13-HODE) (CAS: 18104-45-5), also known as 13(S)-hydroxy-9Z,11E-octadecadienoic acid or 13(S)-HODE, is the major lipoxygenation product synthesized in the body from linoleic acid. 13-HODE prevents cell adhesion to endothelial cells and can inhibit cancer metastasis. 13-HODE synthesis is enhanced by cyclic AMP. gamma-Linolenic acid, a desaturated metabolite of linoleic acid, causes substantial stimulation of 13-HODE synthesis. A fall in gamma-linolenic acid synthesis with age may be related to the age-related fall in 13-HODE formation (PMID: 9561154). 13-HODE is considered an intermediate in linoleic acid metabolism. It is generated from 13(S)-HPODE via the enzyme lipoxygenase (EC 1.13.11.12). 13-HODE has been shown to be involved in cell proliferation and differentiation in a number of systems. 13-HODE is found to be produced by prostate tumours and cell lines and researchers believe that there is a link between linoleic acid metabolism and the development or progression of prostate cancer (PMID: 9367845).
2,2,7,7-Tetramethyl-1,6-dioxaspiro[4.4]nona-3,8-diene is found in alcoholic beverages. 2,2,7,7-Tetramethyl-1,6-dioxaspiro[4.4]nona-3,8-diene is a constituent of hops
Phosphatase, also known as 4-nitrophenylphosphate or dipotassium nitrophenylphosphate, is a member of the class of compounds known as phenyl phosphates. Phenyl phosphates are aromatic organooxygen compounds containing a phosphate group, which is O-esterified with a phenyl group. Phosphatase can be found in a number of food items such as french plantain, fenugreek, pineapple, and horseradish, which makes phosphatase a potential biomarker for the consumption of these food products. A phosphatase is an enzyme that uses water to cleave a phosphoric acid monoester into a phosphate ion and an alcohol. Because a phosphatase enzyme catalyzes the hydrolysis of its substrate, it is a subcategory of hydrolases. Phosphatase enzymes are essential to many biological functions, because phosphorylation (e.g. by protein kinases) and dephosphorylation (by phosphatases) serve diverse roles in cellular regulation and signaling. Whereas phosphatases remove phosphate groups from molecules, kinases catalyze the transfer of phosphate groups to molecules from ATP. Together, kinases and phosphatases direct a form of post-translational modification that is essential to the cell's regulatory network. Phosphatase enzymes are not to be confused with phosphorylase enzymes, which catalyze the transfer of a phosphate group from hydrogen phosphate to an acceptor. Due to their prevalence in cellular regulation, phosphatases are an area of interest for pharmaceutical research .
Thiophene is a maillard product. At room temperature, thiophene is a colorless liquid with a mildly pleasant odor reminiscent of benzene, with which thiophene shares some similarities. The high reactivity of thiophene toward sulfonation is the basis for the separation of thiophene from benzene, which are difficult to separate by distillation due to their similar boiling points (4 °C difference at ambient pressure). Like benzene, thiophene forms an azeotrope with water. Not only is thiophene reactive toward electrophiles, it is also readily lithiated with butyl lithium to give 2-lithiothiophene, which is a precursor to a variety of derivatives, including dithienyl
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).
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.
Ecabet is a prescription eye drop for the treatment of dry eye syndrome. Ecabet represents a new class of molecules that increases the quantity and quality of mucin produced by conjunctival goblet cells and corneal epithelia. Mucin is a glycoprotein component of tear film that lubricates while retarding moisture loss from tear evaporation. Ecabet is currently marketed in Japan as an oral agent for treatment of gastric ulcers and gastritis.
Ganglioside GA1 (d18:1/18:0) 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 GA1 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. Gangliosides are glycosphingolipids. There are four types of glycosphingolipids, the cerebrosides, sulfatides, globosides and gangliosides. Gangliosides are very similar to globosides except that they also contain N-acetyl neuraminic acid (NANA) in varying amounts. The specific names for the gangliosides provide information about their structure. The letter G refers to ganglioside, and the subscripts M, D, T and Q indicate that the molecule contains mono-, di-, tri and quatra-sialic acid. The numbered subscripts 1, 2 and 3 refer to the carbohydrate sequence that is attached to the ceramide. In particular, 1 stands for GalGalNAcGalGlc-ceramide, 2 stands for GalNAcGalGlc-ceramide and 3 stands for GalGlc-ceramide. Deficiencies in lysosomal enzymes that degrade the carbohydrate portions of various gangliosides are responsible for a number of lysosomal storage diseases such as Tay-Sachs disease, Sandhoff disease, and GM1 gangliosidosis. The carbohydrate portion of the ganglioside GM1 is the site of attachment of cholera toxin, the protein secreted by Vibrio cholerae.
2-ene-Valproic acid is only found in individuals that have used or taken Valproic Acid.2-ene-Valproic acid is a metabolite of Valproic Acid. 2-ene-valproic acid belongs to the family of Branched Fatty Acids. These are fatty acids containing a branched chain.
Sulindac sulfone is a metabolite of sulindac. Sulindac is a non-steroidal anti-inflammatory drug of the arylalkanoic acid class that is marketed in the UK & U.S. by Merck as Clinoril. (Wikipedia)
Phosalone is an organophosphate chemical commonly used as an insecticide and acaricide. It is developed by Rhone-Poulenc in France but EU eliminated it from pesticide registration on December 2006.
Diethyldithiophosphate, also known as O,O-diethyl dithiophosphate, potassium salt, 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. Diethyl dithiophosphate is considered to be practically insoluble (in water) and acidic. Diethyldithiophosphate is the processor for production of the organophosphate insecticide Terbufos. (ChemoSummarizer)
Hepatotoxin. Causative agent of much seneciosis, e.g. accidental poisoning by S. by weed residues in bread, and characterised by venoocculosive diseas
2-hydroxyimipramine is a metabolite of imipramine. Imipramine (sold as Antideprin, Deprimin, Deprinol, Depsol, Depsonil, Dynaprin, Eupramin, Imipramil, Irmin, Janimine, Melipramin, Surplix, Tofranil), also known as melipramine, is an antidepressant medication, a tricyclic antidepressant of the dibenzazepine group. Imipramine is mainly used in the treatment of major depression and enuresis (inability to control urination). It has also been evaluated for use in panic disorder. (Wikipedia)
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).
Streptomycin is an aminoglycoside antibiotic produced by the soil actinomycete Streptomyces griseus. It acts by binding to the 30S ribosomal subunit of susceptible organisms and disrupting the initiation and elongation steps in protein synthesis. It is bactericidal due to effects that are not fully understood.
5-Androstene-3b,16b,17a-triol is an steroid found in the urine of human pregnancy (PMID 4452739), in the urine of newborns and infants (PMID 5126818), and in the mono- and disulfate fractions of human bile. (PMID 5410667).
It is used in foods as an anticaking agent, colouring adjunct, dough strengthener, drying agent, firming agent, formulation aid, leavening agent, nutrient supplement, pH control agent, processing aid, stabiliser, thickener, synergist and texturiser; also used as an additive in the bleaching of flour by benzoyl peroxide. Calcium sulfate is a common component of fouling deposits in industrial heat exchangers. It is because its solubility decreases with increasing temperature in hot water (see the figure).; Calcium sulfate is a common laboratory and industrial chemical. In the form of ?-anhydrite (the nearly anhydrous form), it is used as a desiccant. It is also used as a coagulant in products like tofu. In the natural state, unrefined calcium sulfate is a translucent, crystalline white rock. When sold as a color-indicating variant under the name Drierite, it appears blue or pink due to impregnation with cobalt chloride, which functions as a moisture indicator. The hemihydrate (CaSO4.~0.5H2O) is better known as plaster of Paris, while the dihydrate (CaSO4.2H2O) occurs naturally as gypsum. The anhydrous form occurs naturally as ?-anhydrite. Depending on the method of calcination of calcium sulfate dihydrate, specific hemihydrates are sometimes distinguished: alpha-hemihydrate and beta-hemihydrate. They appear to differ only in crystal size. Alpha-hemihydrate crystals are more prismatic than beta-hemihydrate crystals and, when mixed with water, form a much stronger and harder superstructure.
Bleaching agent for food starch. Potassium permanganate is the inorganic chemical compound KMnO4, a water soluble salt consisting of equal mole amounts of potassium (K+) and permanganate (MnO4-, officially called manganate (VII) ) ions. This salt, formerly known as permanganate of potash or Condy's crystals is a strong oxidizing agent. It dissolves in water to give deep purple solutions, evaporation of which gives prismatic purplish-black glistening crystals. In 2000, worldwide production was estimated at 30 000 tonnes. In this compound, manganese is in the +7 oxidation state.; Solid KMnO4 is a strong oxidizer and thus should be kept separated from oxidizable substances. Reaction with concentrated sulfuric acid produces the highly explosive manganese(VII) oxide (Mn2O7). When solid KMnO4 is mixed with pure glycerol it will result in a violent combustion reaction.
Itraconazole is only found in individuals that have used or taken this drug. It is one of the triazole antifungal agents that inhibits cytochrome P-450-dependent enzymes resulting in impairment of ergosterol synthesis. It has been used against histoplasmosis, blastomycosis, cryptococcal meningitis & aspergillosis. [PubChem]Itraconazole 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. Itraconazole 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.
Doxylamine is a sedating antihistamine that can be used by itself as a short-term sleep aid, in combination with other drugs as a night-time cold and allergy relief. It is a member of the ethanolamine class of antihistamines and has anti-allergy power superior to almost every other antihistamine on the market, with the exception of diphenhydramine (Benadryl). It is also the most effective over-the-counter sedative available in North America, and more sedating than some prescription hypnotics. In a study, it was found that doxylamine succinate is possibly more effective than the barbiturate, phenobarbital for use as a sedative. For this reason, doxylamine has sometimes been used off label in a manner similar to diphenhydramine for the reduction of anxiety symptoms; Doxylamine succinate is used by itself as a short-term sleep aid, in combination with other drugs as a night-time cold and allergy relief drug, and a preparation is prescribed in combination with Vitamin B6 (pyridoxine) to prevent morning sickness in pregnant women. In Commonwealth countries, doxylamine is available prepared with paracetamol/acetaminophen and codeine under the brand name Syndol or Mersyndol, as treatment for tension headache and other types of pain, or as a general OTC sleep-aid branded as Somnil, Donormyl, DSozile and Restavit containing Doxylamine Succinate only.
Trimethobenzamide is a novel antiemetic which prevents nausea and vomiting in humans. Its actions are unclear but most likely involves the chemoreceptor trigger zone (CTZ). In dogs pretreated with trimethobenzamide HCl, the emetic response to apomorphine is inhibited, while little or no protection is afforded against emesis induced by intragastric copper sulfate.
Desglymidodrine is a metabolite of midodrine. Midodrine (brand names Amatine, ProAmatine, Gutron) is a vasopressor/antihypotensive agent. Midodrine was approved in the United States by the Food and Drug Administration (FDA) in 1996 for the treatment of dysautonomia and orthostatic hypotension. In August 2010, the FDA proposed withdrawing this approval because the manufacturer, Shire plc, has failed to complete required studies after the medicine reached the market. (Wikipedia) Midodrine, a prodrug, is converted after oral administration into its active drug, desglymidodrine, which acts as an alpha(1)-adrenoceptor stimulant. (PMID: 17901021)  Through selective alpha(1)-adrenergic receptor-binding, desglymidodrine, the active metabolite of midodrine, raises blood pressure by enhancing venous and arterial tone. (PMID: 12904123)
beta-O-Methylynephrine is found in citrus. beta-O-Methylynephrine is obtained from tangerine leaves, poss. as artifact.
4-Aminobutyraldehyde is a metabolite of putrescine. It is a substrate of human liver aldehyde dehydrogenase (EC 1.2.1.3) cytoplasmic (E1) and mitochondrial (E2) isozymes (PMID 3324802).
(Z)-4-Dodecenal is used as a food additive [EAFUS] ("EAFUS: Everything Added to Food in the United States. [http://www.eafus.com/]")
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.
Maillard reaction product from xylose and tryptophan.
2-Indolecarboxylic acid is a strong inhibitor of lipid peroxidation, similar to melatonin and some structurally related indole compounds. Lipid peroxidation with tert-butyl hydroperoxide is a source of free radicals (PMID 12236544). 2-Indolecarboxylic acid is a phenolic components known to exist in Korean ginseng (Koryo Insam Hakhoechi (1996), 20(3), 284-290) and brown rice (Han'guk Nonghwa Hakhoechi (1995), 38(5), 478-83).
(-)-Borneol is found in common thyme and in turmeric. (-)-Borneol is a constituent of <i>Blumea balsamifera</i> (sambong). Both Borneol and Isoborneol and their acetates and formates are used as flavouring agents
Diclofenac acyl glucuronide is a metabolite of diclofenac. Diclofenac is a non-steroidal anti-inflammatory drug (NSAID) taken to reduce inflammation and as an analgesic reducing pain in certain conditions. The name is derived from its chemical name: 2-(2,6-dichloranilino) phenylacetic acid. In the United Kingdom, India, Brazil and the United States, it may be supplied as either the sodium or potassium salt, in China most often as the sodium salt, while in some other countries only as the potassium salt. (Wikipedia)
Ciclopirox is only found in individuals that have used or taken this drug. It is a synthetic antifungal agent for topical dermatologic use. [Wikipedia] Unlike antifungals such as itraconazole and terbinafine, which affect sterol synthesis, ciclopirox is thought to act through the chelation of polyvalent metal cations, such as Fe<sup>3+</sup> and Al<sup>3+</sup>. These cations inhibit many enzymes, including cytochromes, thus disrupting cellular activities such as mitochondrial electron transport processes and energy production. Ciclopirox also appears to modify the plasma membrane of fungi, resulting in the disorganization of internal structures. The anti-inflammatory action of ciclopirox is most likely due to inhibition of 5-lipoxygenase and cyclooxygenase. Ciclopirox may exert its effect by disrupting DNA repair, cell division signals and structures (mitotic spindles) as well as some elements of intracellular transport.
Palonosetron (INN, trade name Aloxi) is a 5-HT3 antagonist used in the prevention and treatment of chemotherapy-induced nausea and vomiting (CINV). It is the most effective of the 5-HT3 antagonists in controlling delayed CINV nausea and vomiting that appear more than 24 hours after the first dose of a course of chemotherapy and is the only drug of its class approved for this use by the U.S. Food and Drug Administration. As of 2008, it is the most recent 5-HT3 antagonist to enter clinical use. [wikipedia]
Isoplumbagin is found in nuts. Isoplumbagin is a constituent of Juglans regia (walnut) and Juglans nigra (black walnut).
Cysteinylhydroxyproline is a dipeptide composed of cysteine 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.
Beta-Carotene belongs to the class of organic compounds known as carotenes. These are a type of polyunsaturated hydrocarbon molecules containing eight consecutive isoprene units. Carotenes are characterized by the presence of two end-groups (mostly cyclohexene rings, but also cyclopentene rings or acyclic groups) linked by a long branched alkyl chain. Beta-carotene is therefore considered to be an isoprenoid lipid molecule. Beta-carotene is a strongly coloured red-orange pigment abundant in fungi, plants, and fruits. It is synthesized biochemically from eight isoprene units and therefore has 40 carbons. Among the carotenes, beta-carotene is distinguished by having beta-rings at both ends of the molecule. Beta-Carotene is biosynthesized from geranylgeranyl pyrophosphate. It is the most common form of carotene in plants. In nature, Beta-carotene is a precursor (inactive form) to vitamin A. Vitamin A is produed via the action of beta-carotene 15,15'-monooxygenase on carotenes. In mammals, carotenoid absorption is restricted to the duodenum of the small intestine and dependent on a class B scavenger receptor (SR-B1) membrane protein, which is also responsible for the absorption of vitamin E. One molecule of beta-carotene can be cleaved by the intestinal enzyme Beta-Beta-carotene 15,15'-monooxygenase into two molecules of vitamin A. Beta-Carotene contributes to the orange color of many different fruits and vegetables. Vietnamese gac and crude palm oil are particularly rich sources, as are yellow and orange fruits, such as cantaloupe, mangoes, pumpkin, and papayas, and orange root vegetables such as carrots and sweet potatoes. Excess beta-carotene is predominantly stored in the fat tissues of the body. The most common side effect of excessive beta-carotene consumption is carotenodermia, a physically harmless condition that presents as a conspicuous orange skin tint arising from deposition of the carotenoid in the outermost layer of the epidermis.
Asparaginylhydroxyproline is a dipeptide composed of asparagine 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.
Aceteugenol, also known as eugenol acetate, belongs to the class of organic compounds known as phenol esters. These are aromatic compounds containing a benzene ring substituted by a hydroxyl group and an ester group. Aceteugenol is an extremely weak basic (essentially neutral) compound (based on its pKa). Aceteugenol is a sweet-, carnation-, and clove-tasting compound. Outside of the human body, aceteugenol is found, on average, in the highest concentration in a few different foods, such as cloves, Ceylon cinnamons, and sweet bay. Aceteugenol has also been detected, but not quantified in, several different foods, such as nutmegs, herbs and spices, cumins, star anises, and lemon balms. This could make aceteugenol a potential biomarker for the consumption of these foods. Aceteugenol is a flavouring agent found in Caraway, oil of clove (Syzygium aromaticum), cinnamon leaf (Cinnamomum verum), and other essential oils.
Diethyl succinate, also known as diethyl butanedioate, belongs to the class of organic compounds known as fatty acid esters. These are carboxylic ester derivatives from a fatty acid.
Bentiromide is a peptide used as a screening test for exocrine pancreatic insufficiency and to monitor the adequacy of supplemental pancreatic therapy. It is given by mouth as a noninvasive test. The amount of 4-aminobenzoic acid and its metabolites excreted in the urine is taken as a measure of the chymotrypsin-secreting activity of the pancreas. Headache and gastrointestinal disturbances have been reported in patients taking bentiromide. Bentiromide is not available in the U.S. or Canada (It was withdrawn in the US in October 1996).
Anticaking agent
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
Mannan is found in arabica coffee. Mannan is found in custard apples. Mannan is widely used in food industry, e.g. in the preparation of rice substitutes and in jellies. Thickening agent Detection of mannan leads to lysis in the mannan-binding lectin pathway.It is generally found in yeast, bacteria and plants. It shows (1-4) linkage. It is a form of a storage polysaccharide. Mannan is a plant polysaccharide that is a polymer of the sugar mannose
Tauro-b-muricholic 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).
1,3-Dichloropropene, also known as Telone or simply 1,3-D, is a colorless liquid with a sweet smell. It exists as a mixture of the geometric isomers cis-1,3-dichloropropene and trans-1,3-dichloropropene. It dissolves in water and evaporates easily. It is used mainly in farming as a pesticide, specifically as a preplant fumigant and nematicide. It widely used in the US and other countries, but in the process of being phased out in the European Union.
Aesculin is found in barley. Vitamin C2 is generally considered a bioflavanoid, related to vitamin P Aesculin is a glucoside that naturally occurs in the horse chestnut (Aesculus hippocastanum), California Buckeye (Aesculus californica) and in daphnin (the dark green resin of Daphne mezereum)
4-Nitrocatechol is the by-product of the hydroxylation of 4-nitrophenol by the human cytochrome P450 (CYP) 2E1. This reaction is a useful metabolic marker for the presence of functional cytochrome P450 2E1 in mammalian cell microsomes. Hepatic and extrahepatic microsomal cytochrome P450 isozymes further catalyze the reduction of p-nitrocatechol into p-aminophenol (PMID: 8267647, 8214571, 8267647).
Tetracosapentaenioc acid is intermediate of Linolenic acid metabolism.
3,17-Androstanediol glucuronide is a natural human metabolite of 3,17-Androstanediol 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.
Gamma-delta-Dioxovaleric acid (DOVA) is the final oxidation product of 5-aminolevulinic acid, a precursor of porphyrin in the biosynthesis of heme. It can accumulate in liver, brain, and other organs under pathological conditions such as acute intermittent porphyria.
L-3-Aminodihydro-2(3H)-furanone is found in pulses. L-3-Aminodihydro-2(3H)-furanone is a constituent of pea Pisum sativum seedlings
Tracheloside is found in fats and oils. Tracheloside is a constituent of Carthamus tinctorius (safflower)
2,5-Dimethyl-3-propylpyrazine is a maillard produc
Cefotaxime is a third-generation cephalosporin antibiotic. Like other third-generation cephalosporins, it has broad spectrum activity against Gram positive and Gram negative bacteria. In most cases, it is considered to be equivalent to ceftriaxone in terms of safety and efficacy. Cefotaxime sodium is marketed under various trade names including Claforan (Sanofi-Aventis).
3-Hexenedioic acid is a normal human unsaturated dicarboxylic acid metabolite with increased excretion in patients with Dicarboxylic aciduria caused by fatty acid metabolism disorders. (PMID 2614263, 7096501) The urinary excretion of 3-Hexenedioic acid is increased in conditions of augmented mobilization of fatty acids or inhibited fatty acid oxidation. (PMID 2001377).
This compound belongs to the family of Ergosterols and Derivatives. These are steroids containing ergosta-5,7,22-trien-3Î²-ol or a  derivative thereof, which is based on the 3Î²-hydroxylated ergostane skeleton
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
Zuclopenthixol is only found in individuals that have used or taken this drug. It is a thioxanthene with therapeutic actions similar to the phenothiazine antipsychotics. It is an antagonist at D1 and D2 dopamine receptors. [PubChem]Zuclopenthixol is a typical antipsychotic neuroleptic drug of the thioxanthene group. It mainly acts by antagonism of D1 and D2 dopamine receptors. Zuclopenthixol also has high affinity for alpha1-adrenergic and 5-HT2 receptors. It has weaker histamine H1 receptor blocking activity, and even lower affinity for muscarinic cholinergic and alpha2-adrenergic receptors.
Acidity regulator
Ethiofencarb metabolite.
N-Acetylarylamine is an odourless solid chemical of leaf or flake-like appearance. It is also known as acetanilide, N-phenylacetamide, acetanil, or acetanilid, and was formerly known by the trade name Antifebrin. N-Acetylarylamine has analgesic and fever-reducing properties; it is in the same class of drugs as acetaminophen (paracetamol). Under the name acetanilid it formerly figured in the formula of a number of patent medicines and over the counter drugs. In 1948, Julius Axelrod and Bernard Brodie discovered that acetanilide is much more toxic in these applications than other drugs, causing methemoglobinemia and ultimately doing damage to the liver and kidneys. As such, acetanilide has largely been replaced by less toxic drugs, in particular acetaminophen, which is a metabolite of acetanilide and whose use Axelrod and Brodie suggested in the same study.
Daidzein is one of several known isoflavones. Isoflavones compounds are found in a number of plants, but soybeans and soy products like tofu and textured vegetable protein are the primary food source. Up until recently, daidzein was considered to be one of the most important and most studied isoflavones, however more recently attention has shifted to isoflavone metabolites. Equol represents the main active product of daidzein metabolism, produced via specific microflora in the gut. The clinical effectiveness of soy isoflavones may be a function of the ability to biotransform soy isoflavones to the more potent estrogenic metabolite, equol, which may enhance the actions of soy isoflavones, owing to its greater affinity for estrogen receptors, unique antiandrogenic properties, and superior antioxidant activity. However, not all individuals consuming daidzein produce equol. Only approximately one-third to one-half of the population is able to metabolize daidzein to equol. This high variability in equol production is presumably attributable to interindividual differences in the composition of the intestinal microflora, which may play an important role in the mechanisms of action of isoflavones. But, the specific bacterial species in the colon involved in the production of equol are yet to be discovered. (PMID:18045128, 17579894). Daidzein is a biomarker for the consumption of soy beans and other soy products.
Morin is found in bilberry. Morin is a constituent of various woods, e.g. Morus alba (white mulberry). First isolated in 1830
L-3-Aminodihydro-2(3H)-furanone is found in pulses. L-3-Aminodihydro-2(3H)-furanone is a constituent of pea Pisum sativum seedlings
Sodium Tetradecyl Sulfate is only found in individuals that have used or taken this drug. It is an anionic surface-active agent used for its wetting properties in industry and used in medicine as an irritant and sclerosing agent for hemorrhoids and varicose veins. Sodium tetradecyl sulfate is a potent toxin for endothelial cells in that brief exposure to even low concentrations are effective in stripping endothelium over a considerable distance and exposing highly thrombogenic endothelium in the process. Diluted sodium tetradecyl sulfate is also able to induce a hypercoagulable state, possibly by selective inhibition of protein C, and can also promote platelet aggregation.
Asparagoside D is found in green vegetables. Asparagoside D is a constituent of asparagus (Asparagus officinalis) roots
Asparagoside E is found in asparagus. Asparagoside E is a constituent of Asparagus officinalis (asparagus)
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).
2-(2-Methylpropyl)thiazole is found in garden tomato. Tomato volatile and flavouring ingredient. Liq. with tomato leaf odou
Eugenitol is found in herbs and spices. Eugenitol is a constituent of the flowers of Eugenia caryophyllata (clove)
Aerating agent for foamed or sprayed food products Chloropentafluoroethane is a chlorofluorocarbon once used as a refrigerant. Its production and consumption has been banned since 1 January 1996 under the Montreal Protocol because of its ozone-depleting potential
Synthetic dimer was found to react rapidly with pyruvate to form the expected oxime. 1H NMR spectrum of the purified oxime is superimposable with that arising when the dimer and pyruvate are mixed and the spectrum taken immediately thereafter. Then the mass spectrum of the reaction product of cycloserine dimer and methylpyruvate is totally consistent with the formation of a stable oxime derivative. Furthermore, when cycloserine is incubated with pyruvate the oxime derived from the dimer is found.(PMID: 2495795).
1,2,4,8-Tetraacetoxy-7-hydroxy-3-(4-hydroxyphenyl)dibenzofuran is found in mushrooms. 1,2,4,8-Tetraacetoxy-7-hydroxy-3-(4-hydroxyphenyl)dibenzofuran is a constituent of the kurukawa mushroom (Boletopsis leucomelas) (edibility not reported)
2-O-(6-Phospho-alpha-mannosyl)-D-glycerate is an alpha-D-mannosylglycerate (MG) that is an intermediate in 2-O-alpha-mannosyl-D-glycerate degradation. It can be generated from 2-O-alpha-mannosyl-D-glycerate via the enzyme 2-O-alpha-mannosyl-D-glycerate transporting phosphotransferase system (mngA). 2-O-Alpha-mannosyl-D-glycerate is a natural extremolyte identified in microorganisms growing under extremely high temperatures up to 100 oC, and had been shown to protect proteins against various stress conditions such as heat, freezing, thawing, and drying. MG that is naturally occurring hyperthermophilic osmolytes, could be potential drug candidates or lead compounds against alpha,beta aggregation associated with Alzheimer's disease(PMID: 18304694). In most organisms MG is produced from guanosine pyrophosphate mannose (GDP-alpha-D-mannose) via mannosyl-3-phosphoglycerate in two steps, catalyzed by the enzymes mannosyl-3-phosphoglycerate synthase and mannosyl-3-phosphoglycerate phosphatase.
delta-Tocotrienol, also known as 8-methyltocotrienol, belongs to the class of organic compounds known as tocotrienols. These are vitamin E derivatives containing an unsaturated trimethyltrideca-3,7,11-trien-1-yl chain attached to the carbon C6 atom of a benzopyran ring system. They differ from tocopherols that contain a saturated trimethyltridecyl chain. Thus, delta-tocotrienol is considered to be a quinone lipid molecule. delta-Tocotrienol is a very hydrophobic molecule, practically insoluble (in water), and relatively neutral. delta-Tocotrienol is found in American cranberry and palm oil. It is a nutriceutical with anticancer properties and a positive influence on the blood lipid profile.
Folic acid or folate, is a vitamin that belongs to the class of compounds known as pterins. Chemically, folate consists of three distinct chemical moieties linked together. A pterin (2-amino-4-hydroxy-pteridine) linked by a methylene bridge to a p-aminobenzoyl group that in turn is linked through an amide linkage to glutamic acid. It is a member of the vitamin B family and is primarily known as vitamin B9. Folate is required for the body to make DNA and RNA and metabolize amino acids necessary for cell division for the hematopoietic system. As humans cannot make folate, it is required in the diet, making it an essential nutrient (i.e. a vitamin). Folate occurs naturally in many foods including mushrooms, spinach, yeast, green leaves, and grasses (poaceae). Folic acid, being biochemically inactive, is converted to tetrahydrofolic acid and methyltetrahydrofolate by the enzyme known as dihydrofolate reductase. Tetrahydrofolate and methyltetrahydrofolate are transported across cells by receptor-mediated endocytosis where they are needed to maintain normal erythropoiesis, synthesize purine and thymidylate nucleic acids, interconvert amino acids and generate formic acid. Folic acid is used in the treatment and prevention of folate deficiencies and megaloblastic anemia. Folic acid is also used as a supplement by women during pregnancy to reduce the risk of neural tube defects (NTDs) in babies. Low levels in early pregnancy are believed to be the cause of more than half of babies born with NTDs (PMID: 28097362). Folic acid is also a microbial metabolite produced by Bifidobacterium and Lactobacillus (PMID: 22254078).
2-Isopropyl-1,4-benzenediol is an antioxidant for fats and oil
Pranoprofen (INN) is a non-steroidal anti-inflammatory drug used in ophthalmology.
Latanoprost ophthalmic solution is a topical medication used for controlling the progression of glaucoma or ocular hypertension, by reducing intraocular pressure. It is a prostaglandin analogue that works by increasing the outflow of aqueous fluid from the eyes. It is also known by the brand name of Xalatan manufactured by Pfizer.
(3beta,11alpha,13beta)-3,11,13-Oleananetriol is found in nuts. (3beta,11alpha,13beta)-3,11,13-Oleananetriol is a constituent of Pistacia vera (pistachio)
Yuccaol C is found in fruits. Yuccaol C is a constituent of the bark of Yucca schidigera (Mojave yucca).
Sterigmatocystin is a mycotoxin of Aspergillus versicolor and Chaetomium species Sterigmatocystin is a poison of the type dermatoxin, from the fungi genus Aspergillus. It appears on crusts of cheese with mold. Sterigmatocystin is a toxic metabolite structurally closely related to the aflatoxins (compare general fact sheet number 2), and consists of a xanthone nucleus attached to a bifuran structure. Sterigmatocystin is mainly produced by the fungi Aspergillus nidulans and A. versicolor. It has been reported in mouldy grain, green coffee beans and cheese although information on its occurrence in foods is limited. It appears to occur much less frequently than the aflatoxins, although analytical methods for its determination have not been as sensitive until recently, and so it is possible that small concentrations in food commodities may not always have been detected. Although it is a potent liver carcinogen similar to aflatoxin B1, current knowledge suggests that it is nowhere near as widespread in its occurrence. If this is the true situation it would be justified to consider sterigmatocystin as no more than a risk to consumers in special or unusual circumstances. Sterigmatocystin is a number of closely related compounds such o-methyl sterigmatocystin are known and some may also occur naturally. The IARC-classification of sterigmatocystin is group 2B, which means it is possibly carcinogenic to humans. In practice, the risk is quite low however, because this substance only appears on cheese crusts with mold, and because of that the chance of daily exposure is very low. Sterigmatocystin is a molded crust is best not to be consumed in whole, but after removing the crust, the cheese can still be consumed. Sterigmatocystin is a different kind of mold than that which appears on cheese itself, which can simply be removed before further consumption
4-Hydroxy-1-(3-pyridinyl)-1-butanone, also known as 4-HPB, is classified as a member of the Aryl alkyl ketones. Aryl alkyl ketones are ketones have the generic structure RC(=O)R', where R = aryl group and R'=alkyl group. 4-Hydroxy-1-(3-pyridinyl)-1-butanone is considered to be soluble (in water) and relatively neutral
Murocholic 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).
Linustatin is a member of the class of compounds known as cyanogenic glycosides. Cyanogenic glycosides are glycosides in which the aglycone moiety contains a cyanide group. Linustatin is soluble (in water) and a very weakly acidic compound (based on its pKa). Linustatin can be found in a number of food items such as broad bean, plains prickly pear, shea tree, and longan, which makes linustatin a potential biomarker for the consumption of these food products.
Neolinustatin is found in cereals and cereal products. Neolinustatin is isolated from flaxseed meal.
Dimethylurea (DMU) (IUPAC systematic name: 1,3-Dimethylurea ) is a urea derivative and used as an intermediate in organic synthesis. It is a colorless crystalline powder with little toxicity.
Kinetensin 1-8 is a fraction of kinetensin with only an Ile-Ala-Arg-Arg-His-Pro-Tyr-Phe peptide chain. Kinetensin is a nonapeptide, originally isolated from pepsin-treated plasma that shares some sequence homology with the C-terminal end of neurotensin, serum albumin, and angiotensin. It is a potent histamine releaser in rodents and may serve as an inflammatory mediator.
A nasal vasoconstricting decongestant drug which acts by binding to the same receptors as adrenaline. It is applied as a spray or as drops into the nose to ease inflammation and congestion of the nasal passageways. It binds alpha-adrenergic receptors to activate the adrenal system which causes systemic vasoconstriction, thereby easing nasal congestion.
45-Hydroxyyessotoxin is found in mollusks. 45-Hydroxyyessotoxin is a constituent of toxic scallop (Patinopecten yessoensis)
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
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.
Pregabalin is an anticonvulsant drug used for neuropathic pain, as an adjunct therapy for partial seizures, and in generalized anxiety disorder. It was designed as a more potent successor to gabapentin. Pregabalin is marketed by Pfizer under the trade name Lyrica. It is considered to have a dependence liability if misused, and is classified as a Schedule V drug in the U.S. [Wikipedia]
Ferricytochrome is a cytochrome containing reduced (ferrous) iron. Cytochrome c is an electron-carrying protein found in mitochondria of all aerobic organisms. It is part of the terminal oxidation chain, which completes the breakdown of foods to COZ and HzO, storing the liberated chemical energy in molecules of ATP. Like myoglobin, it is an iron porphyrin protein, made up of one heme group and one polypeptide chain. The iron atomalternates between the +2 and +3 oxidation state as the molecule interacts in turn with cytochrome reductase and cytochrome oxidase, each a large multimolecular complex (l-3). One of the goals of the present x-ray analysis is to understand how electron. transfer occurs into and out of cytochrome c, which will ultimately require a knowledge of the molecular structure in both the ferric and ferrous states.
Doxylamine is a sedating antihistamine that can be used by itself as a short-term sleep aid, in combination with other drugs as a night-time cold and allergy relief. It is a member of the ethanolamine class of antihistamines and has anti-allergy power superior to almost every other antihistamine on the market, with the exception of diphenhydramine (Benadryl). It is also the most effective over-the-counter sedative available in North America, and more sedating than some prescription hypnotics. In a study, it was found that doxylamine succinate is possibly more effective than the barbiturate, phenobarbital for use as a sedative. For this reason, doxylamine has sometimes been used off label in a manner similar to diphenhydramine for the reduction of anxiety symptoms; Doxylamine succinate is used by itself as a short-term sleep aid, in combination with other drugs as a night-time cold and allergy relief drug, and a preparation is prescribed in combination with Vitamin B6 (pyridoxine) to prevent morning sickness in pregnant women. In Commonwealth countries, doxylamine is available prepared with paracetamol/acetaminophen and codeine under the brand name Syndol or Mersyndol, as treatment for tension headache and other types of pain, or as a general OTC sleep-aid branded as Somnil, Donormyl, DSozile and Restavit containing Doxylamine Succinate only.
Phenazopyridine is only found in individuals that have used or taken this drug. It is a local anesthetic that has been used in urinary tract disorders. Its use is limited by problems with toxicity (primarily blood disorders) and potential carcinogenicity. [PubChem]Phenazopyridine's mechanism of action is not well known, and only basic information on its interaction with the body is available. It is known that the chemical has a direct topical analgesic effect on the mucosa lining of the urinary tract.
Ciclopirox is only found in individuals that have used or taken this drug. It is a synthetic antifungal agent for topical dermatologic use. [Wikipedia] Unlike antifungals such as itraconazole and terbinafine, which affect sterol synthesis, ciclopirox is thought to act through the chelation of polyvalent metal cations, such as Fe<sup>3+</sup> and Al<sup>3+</sup>. These cations inhibit many enzymes, including cytochromes, thus disrupting cellular activities such as mitochondrial electron transport processes and energy production. Ciclopirox also appears to modify the plasma membrane of fungi, resulting in the disorganization of internal structures. The anti-inflammatory action of ciclopirox is most likely due to inhibition of 5-lipoxygenase and cyclooxygenase. Ciclopirox may exert its effect by disrupting DNA repair, cell division signals and structures (mitotic spindles) as well as some elements of intracellular transport.
Terbium, also known as 65tb or terbio, 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. Terbium is a chemical element with symbol Tb and atomic number 65. It is a silvery-white, rare earth metal that is malleable, ductile, and soft enough to be cut with a knife. The ninth member of the lanthanide series, terbium is a fairly electropositive metal that reacts with water, evolving hydrogen gas. Terbium is never found in nature as a free element, but it is contained in many minerals, including cerite, gadolinite, monazite, xenotime, and euxenite .
Ethylamine, also known as 1-aminoethane or ethanamine, belongs to the class of organic compounds known as monoalkylamines. These are organic compounds containing an primary aliphatic amine group. Ethylamine exists in all living organisms, ranging from bacteria to humans. Ethylamine is an ammonia and fishy tasting compound. Ethylamine can be found found in a few different foods, such as barley, apples, and corns and in a lower concentration in white cabbages, wild carrots, and cabbages. Ethylamine has also been detected, but not quantified, in several different foods, such as black elderberries, common grapes, french plantains, soy beans, and spinachs. Ethylamine is a uremic toxin. Most uremic toxins are metabolic waste products and are normally excreted in the urine or feces. Uremic syndrome may affect any part of the body and can cause nausea, vomiting, loss of appetite, and weight loss. Ethylamine is component of normal human urine it has been suggested that this short aliphatic chain may play a significant role in the central nervous system disturbances observe during hepatic and renal disease especially when the blood brain barrier is compromised.
Organoleptic, flavouring ingredient.
Treprostinil is only found in individuals that have used or taken this drug. It is a synthetic analogue of prostacyclin, used to treat pulmonary hypertension. Treprostinil is marketed as Remodulin&reg. [Wikipedia]The major pharmacological actions of treprostinil are direct vasodilation of pulmonary and systemic arterial vascular beds and inhibition of platelet aggregation. In addition to treprostinil's direct vasodilatory effects, it also inhibits inflammatory cytokine. As a synthetic analogue of prostacyclin, it binds to the prostacyclin receptor, which subsequently induces the aforementioned downstream effects.
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.
Norbuprenorphine is the primary active metabolite of buprenorphine. Norbuprenorphine acts as a Î¼-opioid, Î´-opioid, and nociceptin receptor full agonist, as well as a Îº-opioid receptor partial agonist. Norbuprenorphine crosses the blood-brain-barrier similarly to buprenorphine and likely contributes to its effects. It was observed that Intravenous administration of norbuprenorphine at 1 to 3 mg/kg decreased respiratory rate, whereas buprenorphine had no effect up to 3 mg/kg in rats. (Wikipedia)
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
Isofenphos is an Agricultural insecticide with contact and stomach actio
5-alpha-Dihydrotestosterone glucuronide is a natural human metabolite of 5alpha-Dihydrotestosterone 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.
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.
Benzamide is an intermediate in the Benzoate degradation via CoA ligation. Benzamides are a class of chemical compounds derived from Benzamid, the carbonic acid amide of benzoic acid. In psychiatry some substituted benzamides are therapeutically used as neuroleptics and/or antipsychotics (wikipedia).
Fragransol C is found in herbs and spices. Fragransol C is a constituent of Myristica fragrans (nutmeg)
2,3-Dimethylpyrazine, also known as fema 3271, 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. Some alkylpyrazines are naturally occurring highly aromatic substances which often have a very low odor threshold and contribute to the taste and aroma of various foods including coffee and wines. 2,3-Dimethylpyrazine is an almond, butter, and caramel tasting compound. 2,3-Dimethylpyrazine has been detected, but not quantified, in several different foods, such as asparagus, fruits, red bell peppers, orange bell peppers, and green bell peppers. This could make 2,3-dimethylpyrazine a potential biomarker for the consumption of these foods. It occurs naturally in asparagus, black or green tea, crispbread, malt, raw shrimp, soya, squid, Swiss cheeses, and wheat bread. It occurs naturally in baked potato, black or green tea, crispbread, French fries, malt, peated malt, raw asparagus, roasted barley, roasted filberts or pecans, squid, wheat bread, wild rice (Zizania aquatica), and wort. 2,3-Dimethylpyrazine 2,3-Dimethylpyrazine is a component of the aroma of roasted sesame seeds. Alkylpyrazines are also formed during the cooking of some foods via Maillard reactions. Alkylpyrazines are chemical compounds based on pyrazine with different substitution patterns.
2,6-Dimethylpyrazine, also known as fema 3273 or 2,5-DMP, 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. Alkylpyrazines are chemical compounds based on pyrazine with different substitution patterns. 2,6-Dimethylpyrazine is a cocoa, roastbeef, and roastednut tasting compound. 2,6-Dimethylpyrazine has been detected, but not quantified, in tea. This could make 2,6-dimethylpyrazine a potential biomarker for the consumption of these foods. Alkylpyrazines are also formed during the cooking of some foods via Maillard reactions. It occurs naturally in asparagus, black or green tea, crispbread, malt, raw shrimp, soya, squid, Swiss cheeses, and wheat bread. It occurs naturally in baked potato, black or green tea, crispbread, French fries, malt, peated malt, raw asparagus, roasted barley, roasted filberts or pecans, squid, wheat bread, wild rice (Zizania aquatica), and wort.
Harmine is found in fruits. Harmine is an alkaloid from Passiflora edulis (passionfruit
Rotigotine (Neupro) is a non-ergoline dopamine agonist indicated for the treatment of Parkinson's disease (PD) and restless legs syndrome (RLS) in Europe and the United States. It is formulated as a once-daily transdermal patch which provides a slow and constant supply of the drug over the course of 24 hours. Like other dopamine agonists, rotigotine has been shown to possess antidepressant effects and may be useful in the treatment of depression as well. Rotigotine was developed by Aderis Pharmaceuticals. In 1998, Aderis licensed worldwide development and commercialization rights for rotigotine to the German pharmaceutical company Schwarz Pharma (today a subsidiary of the Belgian company UCB S.A.). The drug has been approved by the EMEA for use in Europe in 2006 and is today being sold in several European countries. In 2007, the Neupro patch was approved by the Food and Drug Administration (FDA) as the first transdermal treatment of Parkinson's disease in the United States. However, as of 2008, Schwarz Pharma has recalled all Neupro patches in the United States and some in Europe because of problems with the delivery mechanism. Rotigotine has been authorized as a treatment for RLS since August 2008.
Mazindol is only found in individuals that have used or taken this drug. It is a tricyclic anorexigenic agent unrelated to and less toxic than amphetamine, but with some similar side effects. It inhibits uptake of catecholamines and blocks the binding of cocaine to the dopamine uptake transporter. [PubChem]Although the mechanism of action of the sympathomimetics in the treatment of obesity is not fully known, these medications have pharmacological effects similar to those of amphetamines. Unlike other sympathomimetic appetite suppressants such as phentermine, mazindol is thought to inhibit the reuptake of norepinephrine rather than to cause its release.
Nalbuphine is only found in individuals that have used or taken this drug. It is a narcotic used as a pain medication. It appears to be an agonist at kappa opioid receptors and an antagonist or partial agonist at mu opioid receptors. [PubChem]The exact mechanism of action is unknown, but is believed to interact with an opiate receptor site in the CNS (probably in or associated with the limbic system). The opiate antagonistic effect may result from competitive inhibition at the opiate receptor, but may also be a result of other mechanisms. Nalbuphine is thought primarily to be a kappa agonist. It is also a partial mu antagonist analgesic, with some binding to the delta receptor and minimal agonist activity at the sigma receptor.
Indole-3-carbinol, also known as 3-indolylcarbinol or 1H-indole-3-methanol, belongs to the class of organic compounds known as 3-alkylindoles. 3-Alkylindoles are compounds containing an indole moiety that carries an alkyl chain at the 3-position. Indole-3-carbinol is a dietary indole present in cruciferous vegetables that has been shown to influence estradiol metabolism in humans and may provide a new chemopreventive approach to estrogen-dependent diseases (PMID:2342128). Indole-3-carbinol is produced by members of the family Cruciferae, particularly members of the genus Brassica (e.g. cabbage, radishes, cauliflower, broccoli, Brussels sprouts, and daikon). Indole-3-carbinol is metabolized into a number of products, including the dimeric 3,3'-diindolylmethane. Both 3,3'-diindolylmethane and indole-3-carbinol are thought to have biological effects. Indole-3-carbinol is a natural chemopreventive compound. It has multiple anticarcinogenic and antitumorigenic properties; it can suppress the proliferation of certain cancer cells, including breast cancer, prostate cancer, endometrial cancer, colon cancer, and leukemic cells (PMID:16634522, 16082211).
L-N-(1H-Indol-3-ylacetyl)aspartic acid is found in garden tomato (var.). L-N-(1H-Indol-3-ylacetyl)aspartic acid is a constituent of many plant species including soybean Glycine max. It is a metabolite of 1H-Indole-3-acetic acid <ht>BNC14-M</ht> in plant tissues.
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.
Pyrophosphate, also known as diphosphoric acid or ppi, is a member of the class of compounds known as non-metal pyrophosphates. Non-metal pyrophosphates are inorganic non-metallic compoundscontaining a pyrophosphate as its largest oxoanion. Pyrophosphate can be found in a number of food items such as bitter gourd, babassu palm, groundcherry, and black crowberry, which makes pyrophosphate a potential biomarker for the consumption of these food products. Pyrophosphate can be found primarily in blood, saliva, and urine, as well as throughout most human tissues. Pyrophosphate exists in all living organisms, ranging from bacteria to humans. In humans, pyrophosphate is involved in several metabolic pathways, some of which include cardiolipin biosynthesis CL(18:0/16:1(9Z)/16:1(9Z)/16:0), cardiolipin biosynthesis cl(i-13:0/a-17:0/i-18:0/a-17:0), cardiolipin biosynthesis cl(i-12:0/i-16:0/a-15:0/a-25:0), and cardiolipin biosynthesis cl(a-13:0/i-24:0/i-22:0/i-14:0). Pyrophosphate is also involved in several metabolic disorders, some of which include hyperinsulinism-hyperammonemia syndrome, methionine adenosyltransferase deficiency, mevalonic aciduria, and g(m2)-gangliosidosis: variant B, tay-sachs disease. Pyrophosphate is a non-carcinogenic (not listed by IARC) potentially toxic compound. In chemistry, a pyrophosphate is a phosphorus oxyanion. Compounds such as salts and esters are also called pyrophosphates. The group is also called diphosphate or dipolyphosphate, although this should not be confused with phosphates. As a food additive, diphosphates are known as E450. A number of hydrogen pyrophosphates also exist, such as Na2H2P2O7, as well as the normal pyrophosphates .
Diloxanide furoate is an anti-protozoal drug used in the treatment of Entamoeba histolytica and some other protozoal infections. Although it is not currently approved for use in the United States, it was approved by a CDC study in the treatment of 4,371 cases of Entamoeba histolytica from 1977 to 1990.
Diloxanide furoate is an anti-protozoal drug used in the treatment of Entamoeba histolytica and some other protozoal infections. Although it is not currently approved for use in the United States, it was approved by a CDC study in the treatment of 4,371 cases of Entamoeba histolytica from 1977 to 1990.
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.
N-Acetylaspartylglutamate (NAAG) is a neuropeptide found in millimolar concentrations in the brain that is localized to subpopulations of glutamatergic, cholinergic, GABAergic, and noradrenergic neuronal systems. NAAG is released upon depolarization by a Ca(2+)-dependent process and is an agonist at mGluR3 receptors and an antagonist at NMDA receptors. NAAG is catabolized to N-acetylaspartate and glutamate primarily by glutamate carboxypeptidase II, which is expressed on the extracellular surface of astrocytes. The levels of NAAG and the activity of carboxypeptidase II are altered in a regionally specific fashion in several neuropsychiatric disorders (PMID:9361299). N-Acetylaspartylglutamic acid (NAAG) is a purported precursor of N-acetylaspartic acid (NAA) and is present at about one-tenth of the concentration of NAA in the brain. NAAG has been reported to activate N-methyl-D-aspartic acid (NMDA) receptors in neurons. Previous immunohistochemical studies in the vertebrate central nervous system (CNS) have suggested that NAAG is exclusively localized to neurons. Recent evidence, however, indicates that NAAG might also be localized to nonneuronal cells within the CNS. Only traces of NAA and NAAG are detectable in other tissues. Some compounds can change levels of NAA and NAAG in the brain. For example, methylphenidate increases the levels of NAA and NAAG in the cerebral cortex; amphetamine also increases NAA concentration in a mature brain by 26%, raising the possibility that other neurochemical systems might be involved in the clinical effects of stimulants (PMID:10603234).
Glyceric acid 1,3-biphosphate (CAS: 1981-49-3), also known as 1,3-bisphosphoglycerate (1,3BPG) or PGAP, is a 3-carbon organic molecule present in most, if not all living creatures. It primarily exists as a metabolic intermediate in glycolysis during respiration. 1,3BPG has been recognized as regulatory signal implicated in the control of metabolism, oxygen affinity of red cells, and other cellular functions. 1,3BPG concentration in erythrocytes changes in a number of pathological conditions, such as inherited phosphoglycerate kinase deficiency in erythrocytes (involved in the synthesis and breakdown of 1,3BPG) (PMID: 3555887). Glyceric acid 1,3-biphosphate is phosphorylated at the number 1 and 3 carbons. The result of this phosphorylation gives 1,3BPG important biological properties such as the ability to phosphorylate ADP to form the energy storage molecule ATP (Wikipedia).
Parvisoflavone A is found in pulses. Parvisoflavone A is isolated from Phaseolus aureus (mung bean).
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.
Cinnamic acid, also known as (Z)-cinnamate or 3-phenyl-acrylate, belongs to the class of organic compounds known as cinnamic acids. These are organic aromatic compounds containing a benzene and a carboxylic acid group forming 3-phenylprop-2-enoic acid. Cinnamic acid can be obtained from oil of cinnamon, or from balsams such as storax. Cinnamic acid is a weakly acidic compound (based on its pKa). It is a white crystalline compound that is slightly soluble in water, and freely soluble in many organic solvents. Cinnamic acid exists in all living organisms, ranging from bacteria to plants to humans. Outside of the human body, cinnamic acid has been detected, but not quantified in, chinese cinnamons. In plants, cinnamic acid is a central intermediate in the biosynthesis of myriad natural products include lignols (precursors to lignin and lignocellulose), flavonoids, isoflavonoids, coumarins, aurones, stilbenes, catechin, and phenylpropanoids.
Pacific Ciguatoxin 2 is found in fishes. Pacific Ciguatoxin 2 is isolated from Lycodontis javanicus and moray eel.
Dexmethylphenidate is only found in individuals that have used or taken this drug. It is the dextrorotary form of methylphenidate. It is used for treatment of Attention Deficit Hyperactivity Disorder (ADHD). 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.Methylphenidate is a catecholamine reuptake inhibitor that indirectly increases catecholaminergic neurotransmission by inhibiting the dopamine transporter (DAT) and norepinephrine transporter (NET), which are responsible for clearing catecholamines from the synapse, particularly in the striatum and meso-limbic system.
N-depropylpropafenone is a metabolite of propafenone. Propafenone is a class of anti-arrhythmic medication, which treats illnesses associated with rapid heart beats such as atrial and ventricular arrhythmias. (Wikipedia)
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).
An alkylating nitrogen mustard that is used as an antineoplastic in the form of the levo isomer - melphalan, the racemic mixture - merphalan, and the dextro isomer - medphalan; toxic to bone marrow, but little vesicant action; potential carcinogen. [PubChem]
Pectic acid is a water insoluble, transparent gelatinous acid existing in ripe fruit and some vegetables. Pectic acid exists in the cell walls of plant tissues, and these substances are ingested from vegetables, fruits, etc. Pectic substances are dealt with as dietary fibers, but other physiological functions are not clear. Pectic acid is degraded in the digestive tract of man and it is considered that digestion is by the action of intestinal bacteria. Pectic acid is mainly degraded to 4,5-unsaturated digalacturonic acid and perhaps to 4,5-unsaturated trigalacturonic acid, by the action of the enzymes from bacteria such as Bacteroides sp. and Clostridium sp. in the human digestive tract. Then, they are used as carbon sources by these pectic-acid-using bacteria. (PMID: 12111144).