食品科学 ›› 2008, Vol. 29 ›› Issue (10): 80-84.

• 基础研究 • 上一篇    下一篇

燕麦β-葡聚糖的分子链高级结构及溶液行为研究

 汪海波, 刘大川, 汪海婴, 谢笔钧   

  1. 武汉工业学院湖北省农产品深加工重点实验室; 华中农业大学食品科技学院; 华中科技大学同济医学院基础部;
  • 出版日期:2008-10-15 发布日期:2011-12-08

Study on Advanced Molecular Chain Structure and Solution Behavior of Oat β-Glucan

 WANG  Hai-Bo, LIU  Da-Chuan, WANG  Hai-Ying, XIE  Bi-Jun   

  1. 1.Hubei Key Laboratory of Agriculture Product Deep-pressing,Wuhan Polytechnic University,Wuhan 430023,China; 2.College of Food Science and Technology,Huazhong Agricultural University,Wuhan 430000,China; 3.Basic Department,College of Tongji Medicine,Huazhong University of Science and Technology,Wuhan 430000,China
  • Online:2008-10-15 Published:2011-12-08

摘要: 采用聚酰胺柱层析和乙醇多次沉淀的方法分离纯化,获得燕麦β-葡聚糖主要组分Oglu-1,经HPLC、UV、IR、1HNMR和13CNMR证实Oglu-1为β-D-均聚线型葡聚糖,糖基之间通过β-D-(1→4)和(1→3)糖苷键连接,二者之比为2.1:1,激光光散射测定多糖的相对分子质量为4.49×105。通过测定特性黏度和激光光散射分析建立了Oglu-1水溶液中的Mark-Houwink方程([η]=0.161Mw0.585)和均方根旋转半径-相对分子质量关系模型,证实了Oglu-1分子在溶液中的形态为柔顺性线型高分子链;利用AFM直接观测到Oglu-1是分子链长度约250nm,宽度约为5~10nm,高2~3nm的无支链线型柔顺高分子;CD分析表明,多糖分子量、多糖浓度及pH值、温度等环境因素的改变均可导致溶液中燕麦β-葡聚糖立体构象和非对称性的变化。

关键词: 燕麦&beta, -葡聚糖, 分子链形态, 溶液构象

Abstract: Oglu-1,a main constituent of Oglu,was obtained by multiple ethond precipitation and column chromatography. It was found that Oglu-1 is composed of glucose units only and joined by β-D-(1→4) and β-D-(1→3) linkage with the linkage number ration 2.1:1 by using the methods of UV,IR,1HNMR,13CNMR and HLPC. The average molecular weight of Oglu-1 is 4.49×105 determined by GPC-LLS. The Oglu-1 is semi-flexible chain,which was proved by the Mark-Houwink equation (η =0. 161Mw0.585) and the relation model of Mw-1/2. The molecular chain conformation of Oglu-1 was observed directly by AFM,and its length(250 nm),width(5~10 nm) and high (2~3 nm) obtained respectively. The CD spectrogram showed that the asymmetry,conformation of Oglu-1 may be influenced by average molecular weight,pH,and temperature etc.

Key words: oat &beta, -glucan; molecular chain morphology; conformation;