食品科学 ›› 2008, Vol. 29 ›› Issue (5): 45-48.

• 基础研究 •    下一篇

小麦胚8S球蛋白的分离纯化及理化性质研究

 朱科学, 周惠明   

  1. 食品科学与技术国家重点实验室 江南大学食品学院; 食品科学与技术国家重点实验室; 江南大学食品学院;
  • 出版日期:2008-05-15 发布日期:2011-08-26

Isolation,Purification and Physico-chemical Properties of Wheat Germ 8S Globulin

 ZHU  Ke-Xue, ZHOU  Hui-Ming   

  1. State Key Laboratory of Food Science and Technology,School of Food Science and Technology,Jiangnan University
  • Online:2008-05-15 Published:2011-08-26

摘要: 本实验主要研究了小麦胚球蛋白的主要组成及其理化性质和二级结构。研究结果表明:8S球蛋白是小麦胚球蛋白中最主要的成分,其含有两个亚基谱带55.0kD和38.0~40.0kD;富含谷氨酸、精氨酸、天冬氨酸和亮氨酸,而缺乏胱氨酸和蛋氨酸;小麦胚8S球蛋白主要是β折叠结构(54.9%),其次是无规卷曲结构(25.3%)和α螺旋(19.8%)。

关键词: 小麦胚, 8S球蛋白, 理化性质, 二级结构

Abstract: In this experiment,wheat germ globulin was fractionated,and the physicochemical and structural properties of the main fraction of wheat germ globulin were comprehensively studied. The results of experiments showed that 8S globulin is the major fraction of wheat germ globulin. Reduced SDS-PAGE revealed that wheat germ 8S globulin has two predominant bands (55.0 kD and 38.0~40.0 kD). It has a relatively high level of glutamic acid,arginine,aspartic acid and leucine,whereas cystine and methionine are lacking. CD spectra indicated that wheat germ 8S globulin is a protein rich in β-sheet structure (54.9 %),followed by random coil (25.3 %) and α-helical (19.8 %) structure.

Key words: wheat germ, 8S globulin, physico-chemical properties, secondary structure