title: Synthesis of 6-hydroxylated bile acids and identification of 3 alpha,6 alpha,7 alpha,12 alpha-tetrahydroxy-5 beta-cholan-24-oic acid in human meconium and neonatal urine.
abstract: Three 6-hydroxylated bile acids, 3 alpha,6 alpha,7 alpha,12 alpha-, 3 alpha,6 beta,7 alpha,12 alpha- and 3 alpha,6 beta,7 beta,12 alpha-tetrahydroxy-5 beta-cholan-24-oic acids, were synthesized from methyl cholate, and a sensitive method was developed for analyzing them by gas chromatography-mass spectrometry for the stoichiometric study of fetal bile acids. 3 alpha,6 alpha,7 alpha,12 alpha-Tetrahydroxy-5 beta-cholan-24-oic acid (6 alpha-hydroxylated cholic acid) was identified from human meconium and healthy neonatal urine by comparison with the mass spectrum of the reference compound. In human meconium, 6 alpha-hydroxylated cholic and chenodeoxycholic acids were determined in 1.2% and 29.0% of the total bile acids, respectively. We discuss the significance of hydroxylation at the C-1 beta and C-6 alpha positions of bile acids and their elimination in fetal and neonatal periods.
authors.forename: T
authors.initials: T
authors.lastname: Kurosawa
authors.forename: R
authors.initials: R
authors.lastname: Mahara
authors.forename: H
authors.initials: H
authors.lastname: Nittono
authors.forename: M
authors.initials: M
authors.lastname: Tohma
mesh_terms: D001647:Bile Acids and Salts / Q000032:analysis / Q000138:chemical synthesis* / Q000494:pharmacology / Q000652:urine; D002757:Cholanes / Q000032:analysis* / Q000652:urine; D005260:Female; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D007231:Infant, Newborn; D008470:Meconium / Q000032:analysis*; D011247:Pregnancy
chemical_list: D001647:Bile Acids and Salts; D002757:Cholanes; C035925:3,6,7,12-tetrahydroxycholanoic acid