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A new flavonol glycoside and activity of compounds from the flower of Nymphaea candida

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A new compound, kaempferol 3-O-(2''-O-galloylrutinoside) (1), was isolated from the white flower of Nymphaea candida, together with nine known flavonol glycosides, kaempferol (2), kaempferol 3-O--d-glucopyranoside (3), kaempferol 3-O-α-l-rhamnopyranoside (4), kaempferol 3-O-α-l-rhamnopyranosylglucopyranoside (5), kaempferol 7-O--d-glucopyranoside 3-(O-α-l-rhamnopyranosylglucopyranoside) (6), quercetin (7), quercetin 3-O--d-xylopyranoside (8), myricetin (9), myricetin 3'-O--d-xylopyranoside (10). The structure of 1 was established on the basis of the analysis of its 1D and 2D NMR spectral data. Compounds 1-7 and 9 exhibited moderate to significant antioxidant activities, which were evaluated by measurement of low-density lipoprotein (LDL) and malondialdehyde (MDA) levels in vitro. Compounds 1, 3, 4, 6 and 9 exhibited promising neuroprotective effects on ischemic injury model of cultured rat cortical neurons treated with sodium dithionite in glucose-free medium. Furthermore, compounds 1, 5, and 9 had distinct cytotoxicity to adrenal gland pheochromocytoma, PC12 cells, being treated by the same way.
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Keywords: Antioxidation; Cytotoxicity; Flavonoid; Kaempferol 3-O-(2''-O-galloylrutinoside); Neuroprotection; Nymphaea candida

Document Type: Research Article

Affiliations: Laboratory of Pharmaceutical Sciences, Department of Biological Sciences and Biotechnology, Tsinghua University, Beijing, China

Publication date: January 1, 2007

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