食品科学

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小分子苦瓜多糖MCPⅡa的纯化及结构分析

陈红漫,郭龙伟,章少在,刘姜曼,张海彦,阚国仕*   

  1. 沈阳农业大学生物科学技术学院,辽宁 沈阳 110866
  • 出版日期:2015-05-25 发布日期:2015-05-08
  • 通讯作者: 阚国仕
  • 基金资助:

    国家自然科学基金面上项目(31271842)

Purification and Structural Analysis of a Polysaccharide from Bitter Gourd (Momordica charantia)

CHEN Hongman, GUO Longwei, ZHANG Shaozai, LIU Jiangman, ZHANG Haiyan, KAN Guoshi*   

  1. College of Bioscience and Biotechnology, Shenyang Agricultural University, Shenyang 110866, China  
  • Online:2015-05-25 Published:2015-05-08
  • Contact: KAN Guoshi

摘要:

利用酶解结合水溶醇沉提取水溶性的苦瓜多糖(Momordica charantia polysaccharide,MCP),经Sevag法除蛋白、DEAE-纤维素离子交换、Sephadex G-100凝胶过滤获得活性多糖MCPⅡa。由高效凝胶渗透色谱检测可知MCPⅡa为均一多糖,平均分子质量为13.0 kD,单糖组分分析显示其单糖组成为鼠李糖、半乳糖醛酸、半乳糖、木糖和阿拉伯糖(各组分物质的量比为12∶3.05∶19.89∶5.95∶56)。傅里叶红外光谱、核磁共振及刚果红实验发现其存在C1、C2、C3、C5连接,在水溶液中具有稳定的β-三股螺旋构象,扫描电镜下显示其为菱形晶体颗粒。

关键词: 苦瓜, 多糖, 分离纯化, 结构特征

Abstract:

In this research, a water-soluble polysaccharide (MCP Ⅱa) was extracted from Momordica charantia by cellulase
hydrolysis, precipitated with ethanol, and then purified by DEAE-52 cellulose anion-exchange and Sephadex G-100 gel
filtration chromatography. The high performance gel permeation chromatography (HPGPC) analysis showed that the average
molecular weight of MCP Ⅱa was 13.0 kD. Monosaccharides analysis revealed that the MCP Ⅱa was composed of Rha,
GalA, Gal, Xyl and Ara with a relative molar ratio of 12:3.05:19.89:5.95:56. Infrared (IR) spectrum, 13C-nuclear magnetic
resonance (NMR) and Cango-red tests indicated that MCP Ⅱa formed a β-triple helix in aqueous solution and the C1, C2
and C3, C5 positions were its binding sites. Moreover, it existed as a rhombus crystal under a scanning electron microscope.

Key words: Momordica charantia, polysaccharide, purification, structural analysis

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