title: An LC-MS/MS method for determination of forsythiaside in rat plasma and application to a pharmacokinetic study.
abstract: A highly sensitive liquid chromatography-tandem mass spectrometric (LC-MS/MS) method was developed for the determination of forsythiaside in rat plasma using epicatechin as internal standard. The analytes were extracted by solid-phase extraction and chromatographied on a C(18) column eluted with a gradient mobile phase of acetonitrile and water both containing 0.2% formic acid. The detection was performed by negative ion electrospray ionization in multiple reaction monitoring mode, monitoring the transitions m/z 623-->161 and m/z 289-->109 for forsythiaside and epicatechin, respectively. The assay was linear over the concentration ranges of 2.0-50.0 and 50.0-5000.0ng/mL with limits of detection and quantification of 0.2 and 1.0ng/mL, respectively. The precision was <10.8% and the accuracy was >91.9%, and extraction recovery ranged from 81.3% to 85.0%. This method was successfully applied to a pharmacokinetic study of forsythiaside in rats after intravenous (20mg/kg) and oral (100mg/kg) administration, and the result showed that the compound was poorly absorbed with an absolute bioavailability being approximately 0.5%.
authors: Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, No. 151, Malianwa North Road, Haidian District, Beijing 100193, PR China.
authors: Geng-Nan
authors: GN
authors: Wang
authors: Rui-Le
authors: RL
authors: Pan
authors: Yong-Hong
authors: YH
authors: Liao
authors: Ying
authors: Y
authors: Chen
authors: Jing-Tian
authors: JT
authors: Tang
authors: Qi
authors: Q
authors: Chang
mesh_terms: D000818:Animals; D019540:Area Under Curve; D002392:Catechin / Q000032:analysis / Q000737:chemistry / Q000493:pharmacokinetics; D002853:Chromatography, Liquid / Q000379:methods*; D004355:Drug Stability; D004365:Drugs, Chinese Herbal / Q000032:analysis / Q000493:pharmacokinetics; D006027:Glycosides / Q000097:blood* / Q000737:chemistry / Q000493:pharmacokinetics; D016018:Least-Squares Analysis; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D052616:Solid Phase Extraction; D053719:Tandem Mass Spectrometry / Q000379:methods*
chemical_list: D004365:Drugs, Chinese Herbal; D006027:Glycosides; D002392:Catechin; C058049:forsythiaside