Simultaneous Determination of Six Coumarins in Rat Plasma and Metabolites Identification of Bergapten <i>in Vitro</i> and <i>in Vivo</i>

Coumarins are abundant in Umbelliferae and Rutaceae plants possessing varied pharmacological activities. The objectives of this study are to develop and validate the method for determination of six coumarins in rat plasma by liquid chromatography coupled with tandem mass spectrometry (LC-MS) and identify the metabolites of bergapten by ultra-high-performance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry (UHPLC-Q-TOF-MS), respectively. Data-dependent acquisition mode (DDA) was applied to trigger enhanced product ion (EPI) scans by analyzing multiple reaction monitoring (MRM) signals. An efficient data processing method “key product ions (KPIs)” was used for rapid detection and identification of metabolites as an assistant tool. The time to reach the maximum plasma concentration (<i>T</i>_max) for the six compounds ranged from 1 to 6 h. A total of 24 metabolites of bergapten were detected <i>in vitro</i> and <i>in vivo</i>. The results could provide a basis for absorption and metabolism of coumarins