Rapid Determination of Bile Acids in Bile from Various Mammals by Reversed-Phase Ultra-Fast Liquid Chromatography

A valid and efficient reversed-phase ultra-fast liquid chromatography method was developed for the simultaneous determination of 13 bile acids in the bile of three mammal species, including rat, pig and human gallstone patients. Chromatographic separation was per-formed with a Shim-pack XR-ODS column, and the mobile phase con-sisted of acetonitrile and potassium phosphate buffer (pH 2.6) at a flow rate of 0.5 mL min21. The linear detection range of most bile acids ranged from 2 to 600 ng mL21 with a good correlation coeffi-cient (>0.9995). The precision of each bile acid was <1.8 % for intra-day and <4.8 % for interday. All bile acids were separated in 15 min with satisfactory resolution, and the total analysis time was 18 min, including equilibration. The method was successfully applied in rapid screening of bile samples from the three mammals. Significant metabolic frameworks of bile acids among various species were observed, whereas considerable quantitative variations in both inter- and intraspecies were also observed, especially for gallstone patients. Our results suggest that detecting the change of bile acid profiles could be applied for the diagnosis of gallstone disease