title: Separation of mono-, di-, and trihydroxy stereoisomers of bile acids by capillary gas-liquid chromatography.
abstract: Capillary gas-liquid chromatographic separation was studied for the complete set of the 26 theoretically possible isomers of mono-, di-, and trihydroxylated 5 beta-cholanic acids, which differ from one another in the number, position, and configuration of hydroxyl groups at C-3, C-7, and/or C-12 in the nucleus, as well as for some of their related acids. The bile acid samples were chromatographed as their methyl ester-trimethylsilyl (TMSi) ether derivatives and analyzed on three capillary columns coated with nonpolar OV-1, slightly polar OV-17, and polar SP-2340 as liquid phases. The retention times on capillary gas-liquid chromatography (GLC) responded dramatically to the minor structural differences, and almost complete separation of the positional and stereochemical isomers was achieved by the combined use of SP-2340 and OV-17 (or OV-1) capillary columns.
mesh_terms: D001647:Bile Acids and Salts / Q000302:isolation & purification*; D002849:Chromatography, Gas; D008722:Methods; D013237:Stereoisomerism
chemical_list: D001647:Bile Acids and Salts