Antioxidant Activities of Extract and Fractions from Receptaculum Nelumbinis and Related Flavonol Glycosides

文献类型： 外文期刊

第一作者： Wu, Yan-Bin

作者： Wu, Yan-Bin;Zheng, Li-Jun;Wu, Jian-Guo;Wu, Jin-Zhong;Chen, Ti-Qiang;Yi, Jun

作者机构：

关键词： Nelumbo nucifera Gaertn.;receptacle;DPPH;ABTS

期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：5.923； 五年影响因子：6.132 ）

ISSN： 1422-0067

年卷期： 2012 年 13 卷 6 期

页码：

收录情况： SCI

摘要： The antioxidant activities of ethanolic crude extract (ECE) and its four different solvent sub-fractions (namely, petroleum ether fraction (PEF), ethyl acetate fraction (EAF), n-butanol fraction (BF) and the aqueous fraction (AF) from the receptacles of Nelumbo nucifera Gaertn. (Receptaculum Nelumbinis) were investigated using two in vitro antioxidant assays. BF showed the highest total phenolic content (607.6 mg/g gallic acid equivalents), total flavonoid content (862.7 mg/g rutin equivalents) and total proanthocyanidin content (331.0 mg/g catechin equivalents), accompanied with the highest antioxidant activity compared to other fractions through 1,1-diphenyl-2-picrylhydrazyl (DPPH) and 2,2'-azino-bis-(3-ethylbenzthiazoline-6-sulphonic acid) (ABTS) radical scavenging assays. Five flavonol glycosides, namely hyperoside (1), isoquercitrin (2), quercetin-3-O-beta-D-glucuronide (3), isorhamnetin-3-O-beta-D-galactoside (4) and syringetin-3-O-beta-D-glucoside (5) were isolated from the Receptaculum Nelumbinis. Compounds 2-5 were isolated for the first time from the Receptaculum Nelumbinis. The five isolated flavone glycosides, particularly compounds 1-3, demonstrated significant DPPH and ABTS radical scavenging activity, with IC50 values of 8.9 +/- 0.2, 5.2 +/- 0.2, 7.5 +/- 0.1 for DPPH and 114.2 +/- 1.7, 112.8 +/- 0.8, 172.5 +/- 0.7 mu g/mL for ABTS, respectively. These results suggest that Receptaculum Nelumbinis has strong antioxidant potential and may be potentially used as a safe and inexpensive bioactive source of natural antioxidants.

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