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Biotransformation and metabolic profile of anemoside B4 with rat small and large intestine microflora by ultra-performance liquid chromatography-quadrupole time-of-flight tandem mass spectrometry.
Biomedical Chromatography : BMC 2017 May
Pulsatilla chinensis (Bunge) Regel is commonly used in Asia, and anemoside B4 (AB4) is its major saponin, with diverse pharmaceutical effects. Previous studies showed that intestinal flora plays an important role in the metabolism of herbs administered orally. In this study, the metabolic profile of AB4 with microflora in rat small and large intestines in vitro was investigated. Gut microflora was collected from different intestinal segments and anaerobically incubated with AB4 at 37°C for 24, 48, 72 and 96 h, respectively. A total of 10 metabolites were detected and identified by ultra- performance liquid chromatography/quadrupole time-of-flight mass spectrometry, involving the products of oxygenation and deglycosylation reactions. Gut microflora in the large intestine generated more comprehensive metabolic pathways, which appears to be attributable to the wider range of bacterial types and numbers of bacteria. Human cancer cell lines SMMC-7721, Hela and MCF-7 were treated with metabolite pools by MTT assay, together with M6 as the greatest deglycosylation product. As a result, M6 exhibited a reduction in cell viability of SMMC-7721 with an IC50 value of 22.28 ± 1.26 μg/mL. The present study provided scientific evidence for AB4 metabolism in small and large intestines, which is helpful to reveal the active forms of AB4 in vivo.
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