Pectic polysaccharides from Biluochun Tea: A comparative study in macromolecular characteristics, fine structures and radical scavenging activities in vitro

文献类型： 外文期刊

第一作者： Guo, Rui

作者： Guo, Rui;Zhang, Jun'ai;Liu, Xin;Li, Xujiao;Sun, Xianbao;Kou, Yuxing;Wu, Yan;Li, Deshun;Liu, Yanfang;Zhang, Hui

作者机构：

关键词： Camellia sinensis L.; Biluochun Tea; Pectic polysaccharides; Macromolecular characteristics; Structural elucidations; Radical scavenging activities in vitro

期刊名称：INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES （ 影响因子：8.025； 五年影响因子：7.626 ）

ISSN： 0141-8130

年卷期： 2022 年 195 卷

页码：

收录情况： SCI

摘要： In this study, two acidic Biluochun Tea polysaccharides (BTP-A11 and BTP-A12) were investigated comparatively, which mainly consisted of Rha, Ara, Gal and GalA, possibly suggesting their pectic nature. Structurally, their galacturonan backbones composed of -> 4)-alpha-D-GalpA-(1 -> and -> 2)-alpha-L-Rhap-(1 -> were revealed similar, while Ara-and Gal-based branches attached to the O-2 of -> 2)-alpha-L-Rhap-(1 -> were in distinctive types, proportions, extensibilities and branching degrees. This could lead to their different macromolecular characteristics, where BTP-A(11) with higher M-w presented a more hyper-branched chain conformation and relatively higher structural flexibility/compactness, thereby resulting in a lower exclusion effect and an insufficient hydrodynamic volume. Besides, better radical scavenging activities in vitro were also determined for Gal-enriched BTP-A(11), where a larger surface area containing more H-donating groups were related to its higher Mw, more hyper-branched conformation, lower DM and higher DA. Therefore, the understanding of structure-property-activity relationships was improved to some degrees for acidic Biluochun Tea polysaccharides, which could be potentially required for more applications in food, medical and cosmetic fields.

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