食品科学 ›› 2013, Vol. 34 ›› Issue (9): 250-255.doi: 10.7506/spkx1002-6630-201309051

• 生物工程 • 上一篇    下一篇

蒜苗过氧化氢酶的分离纯化及部分性质研究

胡瑞斌,孙 芳,任美凤,唐云明*   

  1. 西南大学生命科学学院,重庆市甘薯工程研究中心,三峡库区生态环境教育部重点实验室,重庆 400715
  • 收稿日期:2012-06-21 修回日期:2013-03-26 出版日期:2013-05-15 发布日期:2013-05-07
  • 通讯作者: 唐云明 E-mail:tbright@swu.edu.cn
  • 基金资助:

    重庆市科委重点攻关项目(CSTC2011AB1027)

Isolation, Purification and Some Characterization of Catalase from Garlic Seedlings

HU Rui-bin,SUN Fang,REN Mei-feng,TANG Yun-ming*   

  1. Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education,
    Chongqing Sweet-potato Engineering Research Center, School of Life Science, Southwest University, Chongqing 400715, China
  • Received:2012-06-21 Revised:2013-03-26 Online:2013-05-15 Published:2013-05-07
  • Contact: TANG Yun-ming E-mail:tbright@swu.edu.cn

摘要:

新鲜蒜苗经匀浆、缓冲液浸提、硫酸铵分级沉淀、DEAE-Sepharose离子交换层析、Superdex-200凝胶过滤层析,获得电泳纯的过氧化氢酶。该酶比活力达到25975.36U/mg,酶活回收率为40.05%,纯化倍数为125.97。该酶的全分子质量为234.93kD,亚基分子质量为59.16kD;最适温度为45℃,最适pH值为7.2,该酶在25~45℃及pH5.0~10.0的范围内有较好的稳定性;在最适条件下测得其Km值为38.2mmol/L;甲醇、乙醇、异丙醇及SDS、KSCN、Ag+、Cu2+、Mn2+、Co2+、Cd2+、Zn2+、Ca2+、Mg2+、Ba2+对该酶有抑制作用,Li+、Pb2+及低浓度K+对该酶具有一定的激活作用。

关键词: 蒜苗, 过氧化氢酶, 分离纯化, 性质

Abstract:

Electrophoresis-purity catalase from fresh garlic seedlings was obtained through homogenization, buffer solution
extraction, ammonium sulfate precipitation, DEAE-Sepharose ion exchange chromatography and Superdex-200 gel filtration
chromatography. The specific activity of purified CAT was 25975.36 U/mg with a recovery of 40.05% and a purification
factor of 125.97. The molecular and subunit molecular weight of this enzyme was 234.93 kD and 59.16 kD, respectively.
It was relatively stable in the range of 25—45 ℃ and pH 5.0—10.0 Its optimum temperature and pH were 45 ℃ and 7.2,
respectively. Furthermore, its Km was 38.2 mmol/L under the optimum conditions. Its activity was inhibited by methanol,
ethanol, isopropanol, SDS and KSCN as well as some metal ions such as Ag+, Cu2+, Mn2+, Co2+, Cd2+, Zn2+, Ca2+, Mg2+ and
Ba2+, but was activated by Li+ and Pb2+ as well as low concentration of K+.

Key words: garlic seedlings, catalase, isolation and purification, characterization

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