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Taurocholic acid, known also as cholaic acid, cholyltaurine, or acidum cholatauricum, is a deliquescent yellowish crystalline bile acid involved in the emulsification of fats. It occurs as a sodium salt in the bile of mammals. It is a conjugate of cholic acid with taurine. In medical use, it is administered as a cholagogue and choleretic. [1]
These conjugated bile acids are often referred to as bile salts. The pKa of the unconjugated bile acids are between 5 and 6.5, [ 4 ] and the pH of the duodenum ranges between 3 and 5, so when unconjugated bile acids are in the duodenum, they are almost always protonated (HA form), which makes them relatively insoluble in water.
In the human liver, bile is composed of 97–98% water, 0.7% bile salts, 0.2% bilirubin, 0.51% fats (cholesterol, fatty acids, and lecithin), and 200 meq/L inorganic salts. [ 2 ] [ 3 ] The two main pigments of bile are bilirubin , which is orange-yellow, and its oxidised form biliverdin , which is green.
Chronic diarrhea may be caused by excess bile salts entering the colon rather than being absorbed at the end of the small intestine (the ileum). This condition of bile acid malabsorption occurs after surgery to the ileum , in Crohn's disease , with a number of other gastrointestinal causes, or is commonly a primary, idiopathic condition.
Taurochenodeoxycholic acid is a bile acid formed in the liver of most species, including humans, by conjugation of chenodeoxycholic acid with taurine. [1] It is secreted into bile and then into the intestine. [2] It is usually ionized at physiologic pH. However, although it can be crystallized as the sodium salt.
Excess fat can be a problem because the bile salts your body uses to digest them can irritate the skin around your anus, says Brooks D. Cash, M.D., a professor of medicine at the University of ...
Tauroursodeoxycholic acid is a naturally occurring hydrophilic bile acid which is the taurine conjugated form of ursodeoxycholic acid (UDCA). Humans have only trace amounts of tauroursodeoxycholic acid but bears have large amounts of tauroursodeoxycholic acid and ursodeoxycholic acid in their bile.
Hyocholic acid is conjugated in the liver before secretion with taurine or with glycine to give taurohyocholate or glycohyocholates. Bacterial 7α-dehydroxylation in the colon produces the secondary bile acid, hyodeoxycholic acid. Epimerization of the 7-hydroxyl to the β-position is found in ω-muricholic acid (also known as β-hyocholic acid).
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