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Bile acids are steroid acids found predominantly in the bile of mammals and other vertebrates. Diverse bile acids are synthesized in the liver. [1] Bile acids are conjugated with taurine or glycine residues to give anions called bile salts. [2] [3] [4] Primary bile acids are those synthesized by the liver.
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.
Taurine (/ ˈ t ɔː r iː n /), or 2-aminoethanesulfonic acid, is a non-proteinogenic naturally occurring amino sulfonic acid that is widely distributed in animal tissues. [1] It is a major constituent of bile and can be found in the large intestine, and accounts for up to 0.1% of total human body weight.
Cholic acid, also known as 3α,7α,12α-trihydroxy-5β-cholan-24-oic acid is a primary bile acid [3] that is insoluble in water (soluble in alcohol and acetic acid), it is a white crystalline substance. Salts of cholic acid are called cholates.
Between meals, secreted bile is stored in the gall bladder, where 80–90% of the water and electrolytes can be absorbed, leaving the bile acids and cholesterol. [5] During a meal, the smooth muscles in the gallbladder wall contract, causing bile to be secreted into the duodenum to rid the body of waste stored in the bile as well as aid in the ...
Finally, the conjugated bile acids which remained un-ionized conjugated bile acids are passively absorbed. Venous blood from the ileum goes straight into the portal vein and then into the liver sinusoids. There, hepatocytes extract bile acids very efficiently, and little escapes the healthy liver into systemic circulation.
Deoxycholic acid is a bile acid.Deoxycholic acid is one of the secondary bile acids, which are metabolic byproducts of intestinal bacteria. The two primary bile acids secreted by the liver are cholic acid and chenodeoxycholic acid.
Measurement of 7α-Hydroxy-4-cholesten-3-one, (C4), a bile acid precursor, in serum, shows the increased bile acid synthesis found in bile acid malabsorption. [20] This test is an alternative diagnostic means when available. Fasting blood FGF19 values may have value in the recognition of the disease and prediction of response. [21]