食品科学 ›› 2011, Vol. 32 ›› Issue (3 ): 181-185.doi: 10.7506/spkx1002-6630-201103042

• 生物工程 • 上一篇    下一篇

黑曲霉H1-9b 葡萄糖氧化酶的分离纯化及部分性质研究

苏 茉,高亚朋,梁建荣,黄 洁,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:2010-04-22 修回日期:2011-01-10 出版日期:2011-02-15 发布日期:2011-01-13
  • 基金资助:

    重庆市科学技术委员会科技攻关项目(CSCT2004AC1012)

Isolation, Purification and Some Properties of Glucose Oxidase from Aspergillius niger H1-9b

SU Mo,GAO Ya-peng,LIANG Jian-rong,HUANG Jie,TANG Yun-ming   

  1. Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education,
    Chongqing Sweetpotato Engineering Research Center, School of Life Science, Southwest University, Chongqing 400715, China
  • Received:2010-04-22 Revised:2011-01-10 Online:2011-02-15 Published:2011-01-13

摘要: 采用研磨法破碎黑曲霉H1-9b 菌丝体,经pH5.7 磷酸缓冲液抽提获得粗酶液,粗酶液经DEAE-Sepharose离子交换层析和Superdex-200 凝胶过滤层析,得到葡萄糖氧化酶纯品。该酶的比活力为30569.7U/mg,回收率为30.2%,提纯倍数为41.4 倍,分子质量为94.1kD,为单亚基酶。该酶最适温度为37℃,最适pH 值为5.7,在30~40℃温度范围内稳定性较好,在pH4.0~8.0 范围内活性稳定。以不同浓度葡萄糖为底物在最适条件下测得该酶Km 值为30.69mmol/L,Vmax 为21.88μmol/L。Ag+、Cu2+、Zn2+ 对该酶活性有较大抑制作用。结果表明,该酶稳定性较好,有一定的应用价值。

关键词: 黑曲霉, 葡萄糖氧化酶, 分离, 纯化, 性质

Abstract: Glucose oxidase (GOD), an H2O2-producing enzyme, was isolated and purified from Aspergillius niger H1-9b through electrophoretic homogeneity, ion-exchange chromatography on DEAE-Sepharose column and Superdex-200 gel filtration chromatography. The purified GOD had a molecular weight of 94.1 kD as a monomer. The specific activity of GOD was 30569.7 U/mg with recovery rate of 30.2% and purification fold of 41.4. The optimal reaction pH and temperature of GOD were 5.7 and 37 ℃, respectively. The GOD displayed an excellent stability under the conditions of 30-40 ℃ and pH 4.0-8.0. The kinetic parameters such as Km and Vmax were 30.69 mmol/L and 21.88μmol/L while using glucose as the substrate. Obvious inhibitory effects of Ag+, Cu2+ and Zn2+ on the activity of GOD were observed. Therefore, glucose oxidase from Aspergillius niger H1-9b will have wide applications due to its excellent thermostability and stability in wide pH range.

Key words: Aspergillius niger H1-9b, glucose oxidase, isolation, purification, property

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