Two new flavonoid glucosides from the fruits of Sinopodophyllum hexandrum

Abstract Two new flavonoid glucosides, sinoflavonoidgs A (1) and B (2), along with three known analogues 3–5, were isolated from the fruits of Sinopodophyllum hexandrum. Their structures were established on the basis of extensive spectroscopic (UV, IR, HR-ESI-MS, 1H-NMR, 13C-NMR, HSQC, HMBC) and chromatographic (HPLC) analysis. The isolation of compounds 1–2 represents the first report of ring B-glucosided flavonoids from the genus Sinopodophyllum. The cytotoxic activities of all isolated compounds were evaluated in comparison with etoposide against four cell lines (MCF-7, HepG2, HeLa, KB). The antioxidant activities of all isolated compounds were examined by DPPH free radical-scavenging assay. The preliminary structure-activity relationships showed that the glycosilation of 3-methoxyquercetin at C-3' resulted in a greater decrease of cytotoxic and antioxidant activity.

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