食品科学 ›› 2000, Vol. 21 ›› Issue (11): 22-24.

• 基础研究 • 上一篇    下一篇

贻贝过氧化氢酶的纯化及部分性质

 林少琴, 兰瑞芳, 余萍, 程蔚   

  1. 福建师范大学实验中心
  • 出版日期:2000-11-15 发布日期:2011-12-02

 LIN  Shao-Qin, LAN  Rui-Fang, YU  Ping, CHENG  Wei   

  • Online:2000-11-15 Published:2011-12-02

摘要: 新鲜贻贝肉匀浆抽提液经硫酸铵盐析、DEAE-Sepharose FF柱层析纯化,得到一种过氧化氢酶。该酶为糖蛋白,亚基分子量约为76000,中性糖含量约为10.56%,研究结果表明,贻贝过氧化氢酶的最佳pH7.0左右,对热不稳定,45℃保温15min,酶的残余活力约为70%;60℃保温15min,则酶的残余活力仅剩10.6%左右。NaN3、KCN及某些金属离子如Pb2+、Hg2+、Fe2+、Cd2+等抑制酶的活性;Zn2+、Cu2+、Mg2+则对酶有不同程度的激活作用。

关键词: 贻贝, 过氧化氢酶, 糖蛋白, 纯化, 性质

Abstract: A catalase from fresh Perna Viridis had been purified by the use of saline extraction,ammonium sulfate precipition and DEAE-Sepharose FF column chromatography.It was identified as glycoprotein and the neutral saccharide content of the enzyme was assayed as about 1056% .The enzyme subunit molecular weight was about 76000 as determined by SDS-polyacrylamide gel electrophoresis.The experiment result indicated that the optimal temperatme and pH of the enzyme were 35℃ and 7 respectively.The enzyme was not stable in heat and retained 70% of the original enzyme activity after incubation at 45℃ for 15min .It had only 10.6% of the original enzyme activity after incubation at 60℃ for 15min .Its catalytic activity was strongly inhibited by NaN3 and KCN The metal ions Pb2+、Hg2+、Fe2+、Cd2+ 、Ni2+ showed some inhibition and Zn2+、Cu2+、Mg2+ could increase its activity in varying degrees.

Key words: Perna Viridis Catalase Glycoprotein Purification Properties