title: Column-switching high-performance liquid chromatographic assay for determination of asiaticoside in rat plasma and bile with ultraviolet absorbance detection.
abstract: A column-switching high-performance liquid chromatography (HPLC) method is described for the determination of asiaticoside in rat plasma and bile using column-switching and ultraviolet (UV) absorbance detection. Plasma was simply deproteinated with acetonitrile prior to injection and bile was directly injected onto the HPLC system consisting of a clean-up column, a concentrating column, and an analytical column, which were connected with two six-port switching valves. Detection of asiaticoside was accurate and repeatable, with a limit of quantification of 0.125 microg/ml in plasma and 1 microg/ml in bile. The calibration curves were linear in a concentration range of 0.125-2.5 microg/ml and 1-20 microg/ml for asiaticoside in rat plasma and bile, respectively. This method has been successfully applied to determine the level of asiaticoside in rat plasma and bile samples from pharmacokinetics and biliary excretion studies.
authors.affiliation: Bioanalysis and Biotransformation Research Center, Korea Institute of Science and Technology, Seoul, South Korea.
authors.forename: M
authors.initials: M
authors.lastname: Baek
authors.forename: Y S
authors.initials: YS
authors.lastname: Rho
authors.forename: D H
authors.initials: DH
authors.lastname: Kim
mesh_terms: D000818:Animals; D000890:Anti-Infective Agents / Q000097:blood; D001652:Bile Ducts / Q000378:metabolism*; D002138:Calibration; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004355:Drug Stability; D008297:Male; D011786:Quality Control; D051381:Rats; D017207:Rats, Sprague-Dawley; D013056:Spectrophotometry, Ultraviolet / Q000379:methods; D014315:Triterpenes / Q000097:blood*
chemical_list: D000890:Anti-Infective Agents; D014315:Triterpenes; C004446:asiaticoside