title: Capillary gas-liquid chromatography of 6-hydroxylated bile acids.
abstract: Gas-liquid chromatographic separation of several bile acids with a hydroxyl group at C-6 is described on two capillary columns, CP-Sil-19 CB and CP-Sil-5 CB. The gas-liquid chromatographic retention indices of bile acids with 6 alpha- and 6 beta-hydroxyl groups are compared with those of bile acids without the C-6 hydroxyl group and the effect of the C-6 hydroxyl group on the retention indices of bile acids is determined. Both 6 alpha- and 6 beta-hydroxyl groups increase the retention index of a bile acid. The retention indices of 6 alpha- or 6 beta-hydroxyl derivatives of chenodeoxycholic acid were found to be higher than those of the corresponding 6-hydroxy derivatives of cholic acid on the CP-Sil-19 CB column but lower on the CP-Sil-5 CB column. Although all 6-hydroxylated derivatives of lithocholic, chenodeoxycholic and cholic acids were not completely resolved on either column alone, combining the two columns resulted in the complete separation of all these compounds.
authors.affiliation: Department of Medicine, University of Medicine and Dentistry of New Jersey, New Jersey Medical School, Newark 07103, USA.
authors.forename: A K
authors.initials: AK
authors.lastname: Batta
authors.forename: S K
authors.initials: SK
authors.lastname: Aggarwal
authors.forename: G S
authors.initials: GS
authors.lastname: Tint
authors.forename: M
authors.initials: M
authors.lastname: Batta
authors.forename: G
authors.initials: G
authors.lastname: Salen
mesh_terms: D001647:Bile Acids and Salts / Q000737:chemistry / Q000302:isolation & purification*; D002849:Chromatography, Gas / Q000379:methods*; D006900:Hydroxylation
chemical_list: D001647:Bile Acids and Salts