食品科学 ›› 2001, Vol. 22 ›› Issue (4): 36-39.

• 基础研究 • 上一篇    下一篇

大豆分离蛋白酶法有限水解工艺过程及动力学分析

刘粼   

  1. 浙江工业大学生物与环境工程学院
  • 出版日期:2001-04-15 发布日期:2012-02-16

Study on Enzymatic Limited Hydrolysis of Soy Protein Isolate

 LIU  Lin   

  • Online:2001-04-15 Published:2012-02-16

摘要: 采用 pH- stat法在 pH8.0, T=50℃条件下,以 Alcalase酶对大豆分离蛋白进行有限水解处理,探讨了酶与底物摩尔浓度比 [E]/[S]和反应时间 t对产物水解度及溶解性的影响;研究了相应的有限水解( x<6.0)过程的动力学特征。实验结果显示,控制主要影响因素为 [E]/[S]<0.4%, pH8.0和 T=50℃条件下,在 25min内可使产物的水解度 x达到约 6.0%,并且产物在酸性 pH范围的溶解性明显改善。对实验结果的分析显示,水解过程中底物与酶之间的相互作用引起酶的抑制和失活。在此基础上推导出底物存在临界浓度,在实验条件下,其值为 96.77mg/ml。

关键词: 大豆分离蛋白(SPI), 酶, 有限水解, 工艺过程, 动力学

Abstract: The enzymatic limited hydrolysis (x<6.0) of soy protein isolate (SPI) was carried out with the pH- stat method under pH8.0,T=50℃ .The effects of the main parameters including[E]/[S]in mole ratio and reaction time t on the degree of hydrolysis (x) and the solubility were investigated.The results showed that x could be regulated to below 6.0% with the mentioned factors[E]/[S]=0.4% ,T=50℃ and pH8.0 within about 25min.The solubility of the hydrolysate in acetic pH range got improved obviously.The experiment results showed that the enzyme- substrate intermediate induced the enzyme inhybition and inactivation.A critical[S] would correspond to a [E],which was 96.77mg/ml under the experiment condition.

Key words:  , Soy protein isolate (SPI) Enzyme Limited hydrolysis Preparation Kinetics;