title: Rapid and Sensitive Determination of Timosaponin AIII in Rat Plasma by LC-MS/MS and Its Pharmacokinetic Application.
abstract: A rapid sensitive and selective liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was developed for determination of timosaponin AIII (TA-III) in rat plasma, using ginsenoside Re as an internal standard (IS). TA-III and the IS were detected in MRM mode with a negative ionization electrospray mass spectrometer. The calibration curves were linear over the concentration ranges from 11.14 to 1114 ng/mL and the lower limit of quantification (LLOQ) was 11.14 ng/mL. Intra-day and inter-day precisions (RSD) were within 10%, and accuracy ranged from 6.4% to 9.1%. The extraction recovery at three concentrations ranged from 92.3% to 95.5%. The validated method was successfully applied to monitor the concentrations of TA-III in rat plasma after intragastric  administration. The best fit pharmacokinetic model to estimate the pharmacokinetic  parameters was a single compartment model with weight of 1/x2 for oral administration groups of rats for TA-III.
authors: School of Pharmacy, Shanghai University of Traditional Chinese Medicine, Shanghai 201203,  China. zhangtdmj@yahoo.com.cn.
authors: Yanping
authors: Y
authors: Liu
authors: Yiqiong
authors: Y
authors: Pu
authors: Tong
authors: T
authors: Zhang
authors: Yue
authors: Y
authors: Ding
authors: Bing
authors: B
authors: Wang
authors: Zhenzhen
authors: Z
authors: Cai