食品科学 ›› 2012, Vol. 33 ›› Issue (23): 219-222.

• 生物工程 • 上一篇    下一篇

牛肝锌离子螯合酶粗酶液的特性

辛营营,彭增起*,周长旭,谌启亮,邵 斌,熊 雄,吴定晶,张雅玮   

  1. 南京农业大学 教育部肉品加工与质量控制重点实验室
  • 收稿日期:2011-09-21 修回日期:2012-09-02 出版日期:2012-12-15 发布日期:2012-12-12
  • 通讯作者: 彭增起 E-mail:zqpeng@njau.edu.cn

Characteristics of Crude Zinc Chelatase Extract from Bovine Liver

  • Received:2011-09-21 Revised:2012-09-02 Online:2012-12-15 Published:2012-12-12

摘要: 以牛肝脏中锌离子螯合酶粗酶液为研究对象,对其特性进行研究。结果表明:锌离子螯合酶的最适pH值为6.0,最适温度为60℃;最初的底物浓度与相对酶活力呈正相关;该酶能催化利用含有卟啉环的物质,对原卟啉二钠催化效果尤其明显;单一的激活剂VC、三磷酸腺苷(ATP)对锌离子螯合酶有激活作用,相对酶活力随其添加浓度的增加而升高;金属离子(Fe2+、Mg2+)对锌离子螯合酶有抑制作用。

关键词: 牛肝脏, 锌离子螯合酶, 酶活性, 激活剂, 金属离子

Abstract: Crude zinc chelatase extract prepared from bovine liver and characterized in the present study. The optimal reaction pH and temperature for this enzyme were 6.0 and 60 ℃, respectively, and initial substrate concentration was positively correlated with enzyme activity. This enzyme could catalyze substances with porphyrin ring, especially protoporphyrin disodium. Several activators such as ascorbic acid and ATP could activate its activity in a concentration-dependent manner, whereas Fe2+ and Mg2+ had inhibitory effect on its activity.

Key words: cattle liver, zinc chelatase, enzymatic activity, activator, metal ion