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燕麦β-葡聚糖的分子链高级结构及溶液行为研究

作  者:
汪海波;刘大川;汪海婴;谢笔钧
单  位:
华中科技大学同济医学院基础部;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
关键词:
燕麦β-葡聚糖;分子链形态;溶液构象
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。
译  名:
Study on Advanced Molecular Chain Structure and Solution Behavior of Oat β-Glucan
作  者:
WANG Hai-bo1,2,LIU Da-chuan1,WANG Hai-yin3,XIE Bi-jun2,(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)
关键词:
oat β-glucan;molecular chain morphology;conformation
摘  要:
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.

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