食品科学 ›› 2007, Vol. 28 ›› Issue (8): 290-293.

• 生物工程 • 上一篇    下一篇

产大豆异黄酮β-葡萄糖苷酶菌株的筛选及酶学性质研究

 齐斌, 刘贤金   

  1. 江苏省农业科学院食品安全检测研究所; 江苏省农业科学院食品安全检测研究所 江苏南京210014常熟理工学院生物食品系; 江苏常熟215500; 江苏南京210014;
  • 出版日期:2007-08-15 发布日期:2011-10-24

Study on Screen of Soybean Isoflavone β-Glucosidase-producing Strain and Its Enzymatic Properties

 QI  Bin, LIU  Xian-Jin   

  1. 1.Food Safety Research and Service Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; 2.Department of Biotechnology and Food Engineering, Changshu Institute of Technology, Changshu 215500, China
  • Online:2007-08-15 Published:2011-10-24

摘要: 从自然发酵酱醅中筛选到一株产大豆异黄酮β-葡萄糖苷酶的菌株MT-0204,通过生理生化反应和分子生物学技术鉴定其为黑曲霉。大豆异黄酮β-葡萄糖苷酶最适pH值在5.0~5.5之间;具有热敏性,45℃时酶活最高;K+、Ca2+、Fe2+、Mg2+和Mn2+可以提高该酶活性,Ag+和Hg+强烈抑制该酶的活性;Km值Vmax值分别是22.47mmol/L和5.2mmol/min·mg。

关键词: 大豆异黄酮, &beta, -葡萄糖苷酶, 黑曲霉MT-0204, 酶学性质

Abstract: The MT-0204, a novel strain for producing β-glucosidase, was isolated from natural soy sauce koji in this study. By determination of physiological and biochemical characteristics and comparison of its ITS rDNA gene sequence, it was identified as Aspergillus niger, and named Aspergillus niger MT-0204. Some characteristics of purified β-glucosidase were also studied. The optimum pH value is between 5.0 and 5.5. The enzyme is sensitive to heat, and the optimum temperature is 45 ℃. The enzyme activity can be activated by K+, Ca2+, Fe2+, Mg2+ and Mn2+, while strongly inhibited by Ag+ and Hg+. The Km and Vmax are 22.47 mmol/L and 5.2 mmol/min·mg respectively.

Key words: soybean isoflavones; Aspergillus niger MT-0204; &beta, -glucosidase; enzymatic properties;