Pharmacokinetics study of multiple components absorbed in rat plasma after oral administration of Stemonae radix using ultra-performance liquid-chromatography/mass spectrometry with automated MetaboLynx software analysis.

Stemonae radix (Stemona tuberosa Lour, Bai Bu) is a traditional Chinese medicinal (TCM) plant known for its antitussive and anti-ectoparasitic activity; however, the in vivo pharmacokinetic of its multiple bioactive components remains unknown. In this article, UPLC-Q-TOF-high-definition mass spectrometry (HDMS) coupled with automated data analysis MetaboLynx™ software together were first developed to screen the potentially bioactive components in the rat plasma after oral administration of Stemonae radix. Time course of the absorbed components of Stemonae radix was built to evaluate pharmacokinetic behaviors. This rapid automated analysis method was successfully applied for identification, screening, and monitoring of the 28 constituents absorbed and metabolized studies of Stemonae radix after oral administration to rats. The results showed that the ongoing changes of 28 constituents including eight parent compounds and 20 metabolites in vivo were observed to find biomarkers. From the angle of behavior in vivo, it suggested that croomine and tuberostemonine would be potential efficacy markers. This work also demonstrated that the pharmacokinetics-based UPLC-Q-TOF-HDMS can provide a reliable means of identifying and screening potentially bioactive components contributing to pharmacological effects of medicinal herbs, and to better clarify its action mechanism, further prospecting natural products in the search for new leads in drug discovery.