Analysis of Protein Moiety of Polysaccharide Conjugates Water-extracted from Low Grade Green Tea

文献类型： 外文期刊

第一作者： Chen Xiaoqiang

作者： Chen Xiaoqiang;Shao Shengrong;Li Qian;Wu Long;Wu Zhengqi;Chen Xiaoqiang;Xie Jianchun;Chen Xiaoqiang;Yuan Haibo;Jiang Yongwen;Shao Shengrong;Yuan Hao

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关键词： Green tea; Polysaccharide conjugate; Protein

期刊名称：CHEMICAL RESEARCH IN CHINESE UNIVERSITIES （ 影响因子：1.307； 五年影响因子：0.979 ）

ISSN： 1005-9040

年卷期： 2018 年 34 卷 4 期

页码：

收录情况： SCI

摘要： Tea polysaccharide conjugates(TPCs) were water-extracted and purified from low-grade green tea. Although TPC contains 1.97% covalent binding proteins, Coomassie brilliant blue G250 and R250 could not detect this protein. The "should-shape" absorption peak observed at 250-280 nm in the UV-Vis spectrum was caused by quinone compounds derived from polyphenol oxidation during TPC extraction. The UV-Vis spectrum could be used to detect the decolorizing degree of TPC. TPC aqueous solution merely presented the negative charge properties of its polysaccharides instead of the acid-base property of its protein section, and exhibited higher stability at pH greater than 5.0. No precipitation or haze occurred in three TPC/epigallocatechin gallate(EGCG) aqueous mixtures during 12 h storage. TPC had emulsifying activity, which indicated that its protein moiety formed hydrophobic groups. It is proposed that some of the physicochemical properties of the TPC protein moiety are shielded by its polysaccharide chain.

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