食品科学 ›› 2010, Vol. 31 ›› Issue (17): 136-140.doi: 10.7506/spkx1002-6630-201017031

• 基础研究 • 上一篇    下一篇

桑叶多糖的组成及结构表征

罗晶洁,曹学丽*   

  1. 北京工商大学化学与环境工程学院,北京市植物资源研究开发重点实验室
  • 收稿日期:2010-06-30 出版日期:2010-09-15 发布日期:2010-12-29
  • 通讯作者: 曹学丽 E-mail:caoxl@th.btbu.edu.cn;xuelicao@hotmail.com

Composition and Structure Characterization of Two Mulberry Leaf Polysaccharide Fractions

LUO Jing-jie,CAO Xue-li   

  1. Beijing Key Laboratory of Plant Resources Research and Development, College of Chemical and Environmental Engineering,
    Beijing Technology and Business University, Beijing 100048, China
  • Received:2010-06-30 Online:2010-09-15 Published:2010-12-29
  • Contact: CAO Xue-li E-mail:caoxl@th.btbu.edu.cn;xuelicao@hotmail.com

摘要:

利用高效凝胶色谱(high performance gel permeation chromatography,HPGPC)分析桑叶多糖两个组分MPL1和MPL2 的重均分子质量分别为11800D 和7630D,利用GC 分析MPL1 和MPL2 是由D- 果糖(D-Flu)、L- 阿拉伯糖(L-Ara)、L- 鼠李糖(L-Rha)、D- 木糖(D-Xyl)和D- 葡萄糖(D-Glu)5 种单糖组成,其物质的量比分别为58:9.9:5.8:5.1:21.2和45:6.74:17.2:7.3:24.1。而通过高碘酸氧化和Smith 降解反应的方法得到MPL1 和MPL2 的主链是由1 → 3 位键合的糖基组成,支链为1 → 2 位键合的糖基组成。红外光谱分析桑叶多糖中存在α构型的C — H 吸收峰。

关键词: 桑叶多糖, 高效凝胶色谱, 结构表征, 链接方式

Abstract:

In the present study, we characterized the composition and structural attributes of two polysaccharide fractions (named MPL1 and MPL2) in mulberry leaves obtained after microwave-assisted extraction and Sephadex G50 purification. The HPGPC analysis showed that the weight-average molecular weights of MPL1 and MPL2 were 11800 D and 7630 D, respectively. According to the GC analysis, both polysaccharide fractions were composed of five monosaccharide, namely D-Flu, L-Ara, L-Rha, D-Xyl and D-Glu, and their molar ratio was 58 : 9.9 : 5.8 : 5.1 : 21.2 for MPL1 and 45 : 6.74 : 17.2 : 7.3 : 24.1 for MPL2. By using the classic methods of periodate oxidation and Smith Degradation reaction, both the backbones of MPL1 and MPL2 were found to consist of 1→3 glycosyl bonds and the side chains consisted of 1→2 glycosyl bonds. C-H absorption peak of α configuration was contained in both polysaccharide fractions according to the IR analysis.

Key words: mulberry leaf polysaccharides, HPGPC, characterization, link mode

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