title: Glucuronides of unconjugated 6-hydroxylated bile acids in urine of a patient with malabsorption.
abstract: The excretion of bile acids in urine from a patient with chronic malabsorption was investigated. Bile acids were separated according to mode of conjugation using a lipophilic anion exchanger, diethylaminohydroxypropyl Sephadex LH-20. Following hydrolysis, individual bile acids were analyzed by computerized GC/MS. In addition, bile acid glucuronides were isolated and their methyl ester trimethylsilyl ether derivatives were directly analyzed by GC/MS. The patient had a normal or slightly increased excretion of bile acids in urine. Bile acids carrying a hydroxyl group at C-6 constituted about 40% of the total. Tetrahydroxylated bile acids were present which have not been found in healthy subjects. Glucuronides of otherwise unconjugated bile acids accounted for 20% of the total. About 90% of these conjugates were 6-hydroxylated, hyodeoxycholic acid being the major bile acid. It is suggested that a specific abnormality of bile acid metabolism is related to the disease in this patient.
mesh_terms: D000328:Adult; D001647:Bile Acids and Salts / Q000652:urine*; D002849:Chromatography, Gas; D002852:Chromatography, Ion Exchange; D002855:Chromatography, Thin Layer; D005260:Female; D005965:Glucuronates / Q000652:urine; D006801:Humans; D008286:Malabsorption Syndromes / Q000652:urine*; D013058:Mass Spectrometry
chemical_list: D001647:Bile Acids and Salts; D005965:Glucuronates