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Structural elucidation and antioxidant activity of a novel polysaccharide (TAPB1) from Tremella aurantialba

文献类型： 外文期刊

作者： Du, Xiuju 1 ; Zhang, Yang 1 ; Mu, Hongmei 3 ; Lv, Zhiwei 1 ; Yang, Yan 2 ; Zhang, Jingsong 2 ;

作者机构： 1.Liaocheng Univ, Coll Life Sci, Liaocheng 252059, Shandong, Peoples R China

2.Shanghai Acad Agr Sci, Inst Edible Fungi, Shanghai 201106, Peoples R China

3.Liaocheng Univ, Coll Agr Sci, Liaocheng 252059, Shandong, Peoples R China

关键词： Tremella aurantialba polysaccharide;Chemical structure;Methylation;NMR;Antioxidant activity

期刊名称：FOOD HYDROCOLLOIDS （ 影响因子：9.147； 五年影响因子：9.169 ）

ISSN：

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收录情况： SCI

摘要： A novel water-soluble acidic heteropolysaccharide (designated as TAPB1), with a mean molecular weight of 7.6 x 10(5) Da, was obtained from fruiting bodies of Tremella aurantialba. The heteropolysaccharide had a carbohydrate content of similar to 97.6% and a negative response to the Bradford test. Monosaccharide composition analysis showed that TAPB1 comprised D-mannose, D-xylose, and D-glucuronic acid in the ratio 3.1:2.9:1.2, with trace amounts of D-galactose, D-glucose, and D-galacturonic acid. Methylation data and nuclear magnetic resonance spectral analysis indicated that TAPB1 contained an alpha-(1 -> 3)-linked mannopyranosyl backbone, partially substituted at the O-4 positions with a side chain composed of two xyloses and at the O-2 position with a side chain comprising xylose and glucuronic acid. Antioxidant assays showed that TAPB1 exerted a significant scavenging effect on superoxide radicals and H2O2 in a dose-dependent manner. (C) 2014 Elsevier Ltd. All rights reserved.

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