食品科学 ›› 2004, Vol. 25 ›› Issue (5): 65-69.

• 基础研究 • 上一篇    下一篇

内切菊糖酶的分离纯化及性质研究

 史贤俊, 林影, 吴晓英   

  1. 华南理工大学食品与生物工程学院
  • 出版日期:2004-05-15 发布日期:2011-10-24

Purification and Characterization of Aspergillus niger Endoinulinase

 SHI  Xian-Jun, LIN  Ying, WU  Xiao-Ying   

  1. College of Food and Bioengineering, South China University of Technology
  • Online:2004-05-15 Published:2011-10-24

摘要: 采用DEAE-Sepharose CL-6B离子交换层析从Fructozyme (Aspergillus niger) 中分离得到三个菊糖酶组份EⅠ、EⅡ和EⅢ,其中EⅠ主要表现为内切菊糖酶,其分子量为65,000,以菊糖为底物其最适pH为4.6,最适温度为60℃,Km值为16mmol/L,对pH及温度有较高的稳定性,并利用液相色谱对菊糖酶EI催化水解菊糖的产物进行分析研究。

关键词: 内切菊糖酶, 菊糖, 离子交换层析, 动力学

Abstract: Three enzymes EI、EII and EIII were purified from crude A.niger inulinase Fructozyme by DEAE-Sepharose CL-6B ion-exchange chromatography.EI was identified as endoinulinase,its molecular weight was 65,000.The optimum reaction pHof endoinulinase was about 4.6 and optimum temperature was 60℃ when inulin was used as substrate. Thus Michaelis constantKm was 16mmol/L and endoinulinase was fairly stable to pH and temperature. The application of endoinulinase was approachedpreliminarily.

Key words: endoinulinase, inulin, ion-exchange chromatography, kinetics