高等学校化学学报 ›› 2013, Vol. 34 ›› Issue (4): 881.doi: 10.7503/cjcu20120883

• 生物化学 • 上一篇    下一篇

金钗石斛免疫活性多糖DNP-W1B的结构特征

王军辉, 查学强, 潘利华, 罗建平   

  1. 合肥工业大学生物与食品工程学院, 合肥 230009
  • 收稿日期:2012-09-25 出版日期:2013-04-10 发布日期:2013-03-20
  • 通讯作者: 罗建平,男,博士,教授,主要从事中草药多糖化学与生物学研究.E-mail:jianpingluo@yahoo.com.cn E-mail:jianpingluo@yahoo.com.cn
  • 基金资助:

    国家自然科学基金(批准号:20872024,21006019,31271814);International Foundation for Science(Sweden)(No.F/4577-1)和安徽省国际科技合作计划项目(批准号:12030603020)资助.

Structural Characterization of an Immunoactive Polysaccharide DNP-W1B from Dendrobium nobile Lindl.

WANG Jun-Hui, ZHA Xue-Qiang, PAN Li-Hua, LUO Jian-Ping   

  1. School of Food Engineering and Biotechnology, Hefei University of Technology, Hefei 230009, China
  • Received:2012-09-25 Online:2013-04-10 Published:2013-03-20

摘要:

从金钗石斛茎中获得了1个均一多糖组分DNP-W1B, 采用化学与光谱学结合的手段对其一级结构进行了解析. 结果表明, DNP-W1B分子量为7.7×105, 比旋度20D=+81.3°(c0.3, H2O), 由葡萄糖、 阿拉伯糖和半乳糖3种单糖组成, 摩尔比为6.2:3.1:0.9. DNP-W1B主链由1,4-和1,6-连接的葡萄糖残基组成, 在主链1,6-连接葡萄糖残基的4位形成分支, 支链由末端半乳糖残基和阿拉伯糖残基组成. 初步的免疫活性实验结果表明, DNP-W1B在体外能促进免疫细胞的增殖.

关键词: 金钗石斛, 多糖, 结构解析, 免疫活性

Abstract:

Dendrobium nobile Lindl.(Chinese name "Jin-Chai-Shi-Hu") is a species of Orchidaceae with distribution in Southeast Asia, southwest and south of China. In this work, a water-soluble heteropolysaccharide DNP-W1B with a molecular mass of 7.7×105 and specific rotation of 20D=+81.3°(c 0.3, H2O) was isolated from the stems of D. nobile Lindl. Monosaccharide composition analysis showed that DNP-W1B contained glucose, arabinose and galactose in a molar ratio of 6.2: 3.1: 0.9. The structural features of DNP-W1B were revealed by the combination of chemical and instrumental analysis, including IR, GC, methylation analysis and NMR. The results showed that DNP-W1B possessed a backbone of a disaccharide unit of with 33% branches at O-4 of (1→6)-linked β-D-glucopyranosyl residues. The side chains contained arabinosyl and galactosyl chains. Primary immunological tests in vitro indicated that it could stimulate LPS-induced B lymphocyte and Con A-induced T lymphocyte proliferation. Survey showed that DNP-W1B was a novel immunoactive polysaccharide compound from Dendrobium Sw.

Key words: Dendrobium nobile Lindl., Polysaccharide, Structure analysis, Immunological activity

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