Simultaneous determination of ginkgolides A, B, C and bilobalide by LC-MS/MS and its application to a pharmacokinetic study in rats

The study of pharmacokinetics of Ginkgo biloba extracts in Traditional Chinese Medicine was relatively recent. In this study, a simple, quick and sensitive LC-MS/MS analytical method was developed for the determination of ginkgolides A, B, C and bilobalide in rat plasma. The analytes were completely separated from the endogenous compounds on an Agilent Zorbax Eclipse plus C-18 column (50mmx3.0mm, 1.8 mu m) using an isocratic elution. The single-run analysis time was as short as 5.0min. Sample preparation for protein removal was accomplished used a simple methanol precipitation method, after SPE showing a simultaneous extraction and cleanup of extracts allowing for a direct analysis. Extraction recoveries in rat plasma for ginkgolides A, B, C and bilobalide ranged from 75.6% to 89.0%. The calibration curves were determined over the ranges 0.5-20,000ng/mL for ginkgolides A, B, C and bilobalide respectively. The lower limits of quantification (LLOQ) of the analytes were 0.5ng/mL. Inter-day and intra-day precision and accuracy were below 15% and between 85 and 115%, respectively. Finally, the developed method was successfully applied to a pharmacokinetic study following oral administration of the Ginkgo biloba extracts to the male ICR rats. Copyright (c) 2015 John Wiley & Sons, Ltd.