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Cholic acid is a major primary bile acid produced in the liver and is usually conjugated with glycine or taurine. It facilitates fat absorption and cholesterol excretion. Bile acids are steroid acids found predominantly in the bile of mammals. The distinction between different bile acids is minute, and depends 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). When present in sufficiently high levels, cholic acid can act as a hepatotoxin and a metabotoxin. A hepatotoxin causes damage to the liver or liver cells. A metabotoxin is an endogenously produced metabolite that causes adverse health effects at chronically high levels. Among the primary bile acids, cholic acid is considered to be the least hepatotoxic while deoxycholic acid is the most hepatoxic (PMID: 1641875). The liver toxicity of bile acids appears to be due to their ability to peroxidate lipids and to lyse liver cells. Chronically high levels of cholic acid are associated with familial hypercholanemia. In hypercholanemia, bile acids, including cholic acid, are elevated in the blood. This disease causes liver damage, extensive itching, poor fat absorption, and can lead to rickets due to lack of calcium in bones. The deficiency of normal bile acids in the intestines results in a deficiency of vitamin K, which also adversely affects clotting of the blood. The bile acid ursodiol (ursodeoxycholic acid) can improve symptoms associated with familial hypercholanemia.

LysoPC(16:0) is a lysophospholipid (LyP). It is a monoglycerophospholipid in which a phosphorylcholine moiety occupies a glycerol substitution site. Lysophosphatidylcholines can have different combinations of fatty acids of varying lengths and saturation attached at the C-1 (sn-1) position. Fatty acids containing 16, 18 and 20 carbons are the most common. LysoPC(16:0), in particular, consists of one chain of palmitic acid at the C-1 position. The palmitic acid moiety is derived from fish oils, milk fats, vegetable oils and animal fats. Lysophosphatidylcholine is found in small amounts in most tissues. It is formed by hydrolysis of phosphatidylcholine by the enzyme phospholipase A2, as part of the de-acylation/re-acylation cycle that controls its overall molecular species composition. It can also be formed inadvertently during extraction of lipids from tissues if the phospholipase is activated by careless handling. In blood plasma significant amounts of lysophosphatidylcholine are formed by a specific enzyme system, lecithin:cholesterol acyltransferase (LCAT), which is secreted from the liver. The enzyme catalyzes the transfer of the fatty acids of position sn-2 of phosphatidylcholine to the free cholesterol in plasma, with formation of cholesterol esters and lysophosphatidylcholine. Lysophospholipids have a role in lipid signaling by acting on lysophospholipid receptors (LPL-R). LPL-R's are members of the G protein-coupled receptor family of integral membrane proteins.

Farnesylacetone is found in garden tomato. Farnesylacetone is present in tomatoe

9Z,12Z,15Z-Octadecatrienal

9,12,15-octadecatrienal

LysoPC(0:0/16:0) is a lysophosphatidylcholine, which is a lysophospholipid. The term 'lysophospholipid' (LPL) refers to any phospholipid that is missing one of its two O-acyl chains. Thus, LPLs have a free alcohol in either the sn-1 or sn-2 position. The prefix 'lyso-' comes from the fact that lysophospholipids were originally found to be hemolytic however it is now used to refer generally to phospholipids missing an acyl chain. LPLs are usually the result of phospholipase A-type enzymatic activity on regular phospholipids such as phosphatidylcholine or phosphatidic acid, although they can also be generated by the acylation of glycerophospholipids or the phosphorylation of monoacylglycerols. 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. There is also a phospholipase A1, which is able to cleave the sn-1 ester bond. Lysophosphatidylcholine has pro-inflammatory properties in vitro and it is known to be a pathological component of oxidized lipoproteins (LDL) in plasma and of atherosclerotic lesions. Recently, it has been found to have some functions in cell signalling, and specific receptors (coupled to G proteins) have been identified. It activates the specific phospholipase C that releases diacylglycerols and inositol triphosphate with resultant increases in intracellular Ca2+ and activation of protein kinase C. It also activates the mitogen-activated protein kinase in certain cell types. Lysophosphatidylcholines can have different combinations of fatty acids of varying lengths and saturation attached at the C-1 (sn-1) or C-2 (sn-2) position. LysoPC(0:0/16:0), in particular, consists of one chain of palmitic acid at the C-2 position.

6-[3]-ladderane-1-hexanol

12,13-DHOME (CAS: 263399-35-5), also known as 12,13-dihydroxy-9-octadecenoic acid or 12,13-DiHOME, is the epoxide hydrolase metabolite of the leukotoxin 12,13-EpOME. 12,13-EpOME acts as a protoxin, with the corresponding epoxide hydrolase 12,13-DHOME specifically exerting toxicity. Both the EpOME and the DHOME are shown to have neutrophil chemotactic activity. 12,13-DHOME suppress the neutrophil respiratory burst by a mechanism distinct from that of respiratory burst inhibitors such as cyclosporin H or lipoxin A4, which inhibit multiple aspects of neutrophil activation. 12,13-DHOME is a derivative of the linoleic acid diol that has been reported to be toxic in human tissue preparations. 12,13-DHOME is a naturally occurring proliferator-activated receptor (PPAR) gamma2 ligand, which stimulates adipocytes and inhibits osteoblast differentiation (PMID: 17435320, 12021203, 12127265).

9,10-Epoxyoctadecanoic acid (CAS: 3233-92-9), also known as 9,10-epoxystearate, belongs to the class of organic compounds known as linoleic acids and derivatives. These are derivatives of linoleic acid. Linoleic acid is a polyunsaturated omega-6 18 carbon long fatty acid, with two CC double bonds at the 9- and 12-positions. 9,10-Epoxyoctadecanoic acid is a very hydrophobic molecule, practically insoluble (in water), and relatively neutral. 9,10-Epoxyoctadecanoic acid is an epoxy fatty acid. Epoxy fatty acids bear an oxirane ring that shares a CC-bond with the aliphatic chain. The cis-9,10-epoxyoctadecanoic acid has been found in liver microsomes and is believed to originate from CYP-catalyzed epoxidation of oleic acid.

Nobiletin is found in citrus. Nobiletin is isolated from peel of king orange (Citrus nobilis), seville orange (Citrus aurantium) and other Citrus species, and the round kumquat (Fortunella japonica

cis-Melilotoside, also known as cis-beta-D-glucosyl-2-hydroxycinnamate or cis-coumarinic acid-beta-D-glucoside, 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. cis-Melilotoside is an extremely weak basic (essentially neutral) compound (based on its pKa) and is a beta-D-glucoside consisting of cis-2-coumaric acid having a beta-D-glucosyl residue attached to the phenolic hydroxy group. cis-Melilotoside has been detected, but not quantified in, several different foods, such as globe artichokes, mentha (mint), Malabar spinach, plains prickly pears, and winter savouries. This could make cis-melilotoside a potential biomarker for the consumption of these foods.

Melilotoside, also known as trans-beta-D-glucosyl-2-hydroxycinnamic acid or beta-D-glucosyl-2-coumarate, belongs to the class of organic compounds known as phenolic glycosides. These are organic compounds containing a phenolic structure attached to a glycosyl moiety. Some examples of phenolic structures include lignans and flavonoids. Melilotoside is an extremely weak basic (essentially neutral) compound (based on its pKa). Melilotoside is found in herbs and spices. Melilotoside has been isolated from Melilotus alba (white melilot), Melilotus altissimus (tall yellow sweet clover), and other plants.

Octadecanedioic acid, also known as 1,18-octadecanedioate or octadecane-1,18-dioate, 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. In the case of octadecanedioic acid, it has carboxyl groups at both ends of the chain, not just one. Octadecanedioic acid is a very hydrophobic molecule, practically insoluble (in water). Octadecanedioic acid is a long-chain dicarboxylic acid normally not found in humans that has been identified in the blood serum in Reye's syndrome patients (PMID: 3746531). There may also be an association with colorectal cancer (PMID: 25037050).

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.

Trans-p-coumaroyl beta-d-glucopyranoside, also known as 1-O-(4-hydroxycinnamoyl)-beta-D-glucose or 1-O-(4-coumaroyl)-β-D-glucoside, is a member of the class of compounds known as hydroxycinnamic acid glycosides. Hydroxycinnamic acid glycosides are glycosylated hydoxycinnamic acids derivatives. Trans-p-coumaroyl beta-d-glucopyranoside is slightly soluble (in water) and a very weakly acidic compound (based on its pKa). Trans-p-coumaroyl beta-d-glucopyranoside can be found in tea, which makes trans-p-coumaroyl beta-d-glucopyranoside a potential biomarker for the consumption of this food product.

Hexamethylquercetagetin is found in citrus. Hexamethylquercetagetin is isolated from peel of Citrus specie

trans-p-Coumaric acid 4-glucoside is found in blackcurrant. trans-p-Coumaric acid 4-glucoside is a constituent of Brassica species and other plant species.

PC(18:1(6Z)/0:0)

LysoPC(17:0) 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(17:0), in particular, consists of one chain of margaric acid at the C-1 position. The margaric acid moiety is derived from butter, milk and fat of ruminants. 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.

5,6,2',3',5',6'-Hexamethoxyflavone

5,6,2',3',4',6'-Hexamethoxyflavone

Laudanosine is a member of isoquinolines. It is a conjugate base of a (S)-laudanosine(1+). (S)-Laudanosine is a natural product found in Papaver macrostomum, Papaver somniferum, and other organisms with data available.

Procyanidin a1 is a member of the class of compounds known as biflavonoids and polyflavonoids. Biflavonoids and polyflavonoids are organic compounds containing at least two flavan/flavone units. These units are usually linked through CC or C-O-C bonds. Some examples include C2-O-C3, C2-O-C4, C3'-C3''', and C6-C8''. Procyanidin a1 is practically insoluble (in water) and a very weakly acidic compound (based on its pKa). Procyanidin a1 can be found in bilberry, which makes procyanidin a1 a potential biomarker for the consumption of this food product.

9-Hydroxy-10-ketooctadecanoic acid

Ganoderic acid beta is found in mushrooms. Ganoderic acid beta is a constituent of Ganoderma lucidum (reishi).