食品科学 ›› 2006, Vol. 27 ›› Issue (5): 129-133.

• 基础研究 • 上一篇    下一篇

pH值对SPC功能性和结构的影响

 冯凌凌, 熊犍, 李琳, 杨晓泉   

  1. 华南理工大学轻工与食品学院
  • 出版日期:2006-05-15 发布日期:2011-09-16

pH Effects on Functional Properties and Structure of SPC

 FENG  Ling-Ling, XIONG  Jian, LI  Lin, YANG  Xiao-Quan   

  1. College of Light Industry and Food Science, South China University of Technology, Guangzhou 510640, China
  • Online:2006-05-15 Published:2011-09-16

摘要: 本文通过研究不同pH值对SPC(大豆浓缩蛋白)的溶解性、起泡性和乳化性的影响,并利用凝胶电泳和傅立叶红外光谱方法研究不同pH值对SPC结构的影响;探讨SPC功能性质改善的机理。研究结果表明:SPC的NSI(氮溶指数)随pH值升高而增大,在pH12.0时的NSI远高于pH7.0的;乳化性和起泡性随着NSI增大而有一定程度的改善;电泳图谱表明在改性过程中没有亚基解离;红外光谱分析发现二级结构有较大的变化。

关键词: 大豆浓缩蛋白, 溶解性, 乳化性, 起泡性, 红外光谱, 氮溶指数

Abstract: This paper was to study the effects on NSI, emulsibility and foaming ability of SPC (Soy Protein Concentrate) in different pH. The structures of SPC were analysed by electrophoresis and infra-red spectrum so as to study the principle of increasing of NSI and improvement of emulsibility and foaming ability of SPC. The results showed that with the increasing of the pH, the NSI of SPC increases quickly, the NSI at pH 12.0 is much higher than that of at pH 7.0. Emulsibility and foaming ability are improved with the increasing of the NSI. The electrophoresis showed that the subunit of SPC does not dissociate during modification; but the structures of SPC are changed by infra-red spectrum.

Key words:  , soy protein concentrate(SPC); solubility; emulsibility; foaming; infra-red spectrum; nitrogen solubility index(NSI);