title: A new flavonol glycoside and activity of compounds from the flower of Nymphaea candida.
abstract: 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-beta-D-glucopyranoside (3), kaempferol 3-O-alpha-l-rhamnopyranoside (4), kaempferol 3-O-alpha-l-rhamnopyranosylglucopyranoside (5), kaempferol 7-O-beta-D-glucopyranoside 3-(O-alpha-l-rhamnopyranosylglucopyranoside) (6), quercetin (7), quercetin 3-O-beta-D-xylopyranoside (8), myricetin (9), myricetin 3'-O-beta-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.
authors.affiliation: Laboratory of Pharmaceutical Sciences, Department of Biological Sciences and Biotechnology, Tsinghua University, Beijing 100084, China.
authors.forename: R-N
authors.initials: RN
authors.lastname: Liu
authors.forename: W
authors.initials: W
authors.lastname: Wang
authors.forename: Y
authors.initials: Y
authors.lastname: Ding
authors.forename: W-D
authors.initials: WD
authors.lastname: Xie
authors.forename: C
authors.initials: C
authors.lastname: Ma
authors.forename: L-J
authors.initials: LJ
authors.lastname: Du
mesh_terms: D000818:Animals; D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D000975:Antioxidants / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D004187:Disaccharides / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D044948:Flavonols / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D035264:Flowers / Q000737:chemistry*; D006027:Glycosides / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D044949:Kaempferols / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D009682:Magnetic Resonance Spectroscopy; D018696:Neuroprotective Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D030721:Nymphaea / Q000737:chemistry*; D016716:PC12 Cells; D051381:Rats
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D000975:Antioxidants; D004187:Disaccharides; D044948:Flavonols; D006027:Glycosides; D044949:Kaempferols; D018696:Neuroprotective Agents; C525303:kaempferol 3-O-(2''-O-galloylrutinoside)