glycodeoxycholic-acid and glycolithocholic-acid

A study was carried out on the negative ion thermospray liquid chromatography/mass spectrometry and liquid chromatography/tandem mass spectrometry of a group of bile acids and their glycine conjugates. The liquid chromatographic/tandem mass spectrometric experiments were performed using low-energy collisions on a triple-quadrupole mass spectrometer. It was found that relatively high collision energies and collision gas pressures were required to produce fragmentation and that some unusual fragments were produced.

Topics: Chenodeoxycholic Acid; Cholic Acid; Cholic Acids; Chromatography, Liquid; Deoxycholic Acid; Glycochenodeoxycholic Acid; Glycocholic Acid; Glycodeoxycholic Acid; Lithocholic Acid; Mass Spectrometry

Separation of the glycine and taurine conjugates of ursodeoxycholic acid from those of lithocholic acid, chenodeoxycholic acid, deoxycholic acid, and cholic acid by thin-layer chromatography is described. Thus, on running a silica gel G plate first in a solvent system of n-butanol-water 20:3 and then in a second solvent system of chloroform-isopropanol-acetic acid-water 30:20:4:1, all the above-mentioned conjugated bile acids are separated from one another. The application of this method to study the change in the biliary bile acid conjugation pattern in ursodeoxycholic acid-fed gallstone patients is described.

Topics: Chenodeoxycholic Acid; Chromatography, Thin Layer; Deoxycholic Acid; Glycine; Glycochenodeoxycholic Acid; Glycocholic Acid; Glycodeoxycholic Acid; Lithocholic Acid; Taurochenodeoxycholic Acid; Taurocholic Acid; Taurodeoxycholic Acid; Taurolithocholic Acid; Ursodeoxycholic Acid