Characterization of antioxidant polysaccharides in bitter gourd (Momordica charantia L.) cultivars

文献类型： 外文期刊

第一作者： Wang, Yunqiang

作者： Wang, Yunqiang;Xiang, Changping;Li, Junli;Huang, Jin;Xu, Xiaofei;Wang, Yunqiang

作者机构：

关键词： Bitter gourd;bitter melon;polysaccharide;characterization;antioxidant activities;Momordica charantia L.

期刊名称：JOURNAL OF FOOD AGRICULTURE & ENVIRONMENT （ 影响因子：0.435； 五年影响因子：0.484 ）

ISSN： 1459-0255

年卷期： 2010 年 8 卷 3-4 期

页码：

收录情况： SCI

摘要： Three water-soluble polysaccharides in fruits of bitter gourd (Momordica charantia L.) cultivars, coded as BP1, BP2 and BP3, were isolated by precipitation with alcohol from the aqueous extract of the fruits residue after refluxed with ethanol and deproteined by Sevage method and decolored by 30% H(2)O(2) from the fruit of bitter gourd. Their chemical structure and physicochemical properties were characterized by anthrone-sulfuric acid method, carbazole-sulfuric acid method, FT-IR spectra and gas chromatography, respectively. Furthermore, their antioxidant activities were evaluated by several in vitro systems of assay, namely hydroxyl radical-scavenging activity and superoxide radical-scavenging activity. The results indicated that in the same growing environment, there are differences in monosaccharide composition, structure and antioxidant activities among different bitter gourd cultivars. Three water-soluble polysaccharides of bitter gourd were all composed of L-arabinose (Ara), D-glucose (Glu) and D-galactose (Gal),with variations of the component ratio. All three polysaccharides showed antioxidant activities. They had strong scavenging effect on hydroxyl free radical, and much weaker effect on superoxide radical. Among them, BP I showed the highest scavenging rate on hydroxyl radicals and superoxide radicals. The presence of polysaccharides with high antioxidant capacity in fruits indicates bitter gourd can be considered an important dietary source of antioxidants.

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