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  • Title: In vitro metabolism study of saikosaponin d and its derivatives in rat liver microsomes.
    Author: Yu P, Qiu H, Wang M, Tian Y, Zhang Z, Song R.
    Journal: Xenobiotica; 2017 Jan; 47(1):11-19. PubMed ID: 27052332.
    Abstract:
    1. Saikosaponins, one of the representative bioactive ingredients in Radix Bupleuri, possess hepatoprotective, anti-inflammatory, antiviral, antitumor, and other pharmacological activities. Up to now, few studies focused on the further metabolism of saikosaponins and their secondary metabolites absorbed into the circulatory system. 2. To understand the in vivo efficacy of saikosaponin d, the in vitro metabolism of saikosaponin d, and its two derivatives formed in the gastrointestinal tract, prosaikogenin G and saikogenin G was investigated in rat liver microsomes, respectively. 3. Fifteen metabolites were detected using high-performance liquid chromatography hybrid ion trap and time-of-flight mass spectrometry and triple-quadrupole mass spectrometry, and the predominant metabolic reactions were hydroxylation, carboxylation and combinations of these steps on the aglycone moiety. 4. The metabolic pathways of saikosaponin d, prosaikogenin G, and saikogenin G were proposed in vitro and the results contribute to the understanding of saikosaponins in vivo metabolism.
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