高等学校化学学报 ›› 2013, Vol. 34 ›› Issue (12): 2861.doi: 10.7503/cjcu20130292

• 物理化学 • 上一篇    下一篇

菠萝蛋白酶催化大豆蛋白水解反应的热动力学

李向阳1, 董海洲1, 张洪林2   

  1. 1. 山东农业大学食品科学与工程学院, 泰安 271018;
    2. 曲阜师范大学化学化工学院, 曲阜 273165
  • 收稿日期:2013-03-29 出版日期:2013-12-10 发布日期:2013-06-24
  • 作者简介:董海洲,男,博士,教授,博士生导师,主要从事粮油及生物系统热科学技术研究. E-mail:sdauwh@126.com
  • 基金资助:

    国家自然科学基金(批准号:31071632)和山东省科技发展项目基金(批准号:2011GNC11009)资助.

Thermodynamic Studies on Catalytic Reaction Between Bromelain and Soybean Protein

LI Xiang-Yang1, DONG Hai-Zhou1, ZHANG Hong-Lin2   

  1. 1. College of Food Science and Engineering, Shandong Agricultural University, Taian 271018, China;
    2. College of Chemistry and Chemistry Engineering, Qufu Normal University, Qufu 273165, China
  • Received:2013-03-29 Online:2013-12-10 Published:2013-06-24

摘要:

利用热活性检测仪测定了菠萝蛋白酶催化大豆蛋白水解反应的热功率-时间曲线,按照热动力学理论和对比进度法解析出不同温度、酸度时菠萝蛋白酶催化大豆蛋白水解反应的米凯利斯常数(Km)和最大速率(Vmax),并建立了Km与温度和酸度的关系式,从而获得酶催化反应的最适温度(314.63 K)和最适pH(6.99). 在最适温度和最适pH条件下,测定了金属离子可逆竞争时菠萝蛋白酶催化大豆蛋白水解反应的热功率-时间曲线,对曲线进行处理,得到了酶催化反应的米凯利斯常数(Km’)和最大速率(Vmax’). 建立了Km’与金属离子浓度间的关系式,比较了金属离子对酶催化反应的激活或抑制效果.

关键词: 微量量热法, 热动力学, 菠萝蛋白酶, 催化反应, 大豆蛋白

Abstract:

The power-time curves of reaction between bromelain and soybean protein were determined using microcalorimeter. Using the thermodynamic theory and reduced extent method, the Michaelis constant(Km) and the maximum velocity(Vmax) of catalytic reaction were obtained at different temperatures and pH values, and the equations from the relation between Km and temperatures(Km-T), and pH values(Km-pH) were established. Based on the established equations, the optimum temperature(314.63 K) and the optimum pH(6.99) were gained. Under the optimum temperature and pH, the power-time curves of catalytic reaction with metal ions were obtained, and the apparent Michaelis constant(Km') and the maximum reaction velocity(Vmax') were gained. The relations between the Km' and the contents of metal ions were established. Compared with the Km and Vmax, the activation or inhibition effect of metal ions on enzymatic reaction could be known.

Key words: Microcalorimetric method, Thermodynamic, Bromelain, Catalytic reaction, Soybean protein

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