食品科学

• 生物工程 • 上一篇    下一篇

大豆过氧化氢酶的分离纯化及性质研究

方 玲,孙才云,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
  • 出版日期:2015-01-15 发布日期:2015-01-16

Isolation, Purification and Partial Characterization of Catalase from Soybean (Glycine max)

FANG Ling, SUN Caiyun, TANG Yunming*   

  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
  • Online:2015-01-15 Published:2015-01-16

摘要:

新鲜大豆芽经匀浆、磷酸缓冲液抽提、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。该酶酶活回收率为30.92%,纯化倍数为293.09,酶比活力达到26 322.43 U/mg。该酶全分子质量为234.9 kD,亚基分子质量为57.42 kD;最适pH值为7.2,最适温度为30 ℃,在pH 4.0~10.6及25~35 ℃范围内有较好的稳定性;在30 ℃、pH 7.2条件下测得该酶对过氧化氢的Km值为31.82 mmol/L;十二烷基硫酸钠、草酸、Ag+、Cu2+对该酶有强烈的抑制作用,Pb2+对该酶有双重作用,低浓度时有激活作用而高浓度时抑制酶活性。

关键词: 大豆, 过氧化氢酶, 分离纯化, 性质

Abstract:

Electrophoresis-purity catalase (CAT) was obtained from freshly sprouted soybean (Glycine max) by the
sequential steps of homogenization, buffer solution extraction, ammonium sulfate precipitation, DEAE-Sepharose ion
exchange chromatography and Superdex-200 gel filtration chromatography. The purified enzyme had a specific activity of
26 322.43 U/mg, with a 30.92% activity recovery and a 293.09-fold purification. The molecular mass of the CAT enzyme
comprising a 57.42 kD subunit was 234.9 kD. Its optimum pH and temperature were 7.2 and 30 ℃, respectively. This
enzyme was stable at pH 4.0–10.6 and at 25–35 ℃. Its Km towards H2O2 was 31.82 mmol/L. The enzyme activity was
strongly inhibited by sodium dodecyl sulfate (SDS), oxalic, Ag+ and Cu2+, but was activated by low concentration of Pb2+.

Key words: soybean, catalase, isolation and purification, characterization

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