SCI和EI收录∣中国化工学会会刊

›› 2017, Vol. 25 ›› Issue (4): 487-492.DOI: 10.1016/j.cjche.2016.08.027

• Biotechnology and Bioengineering • 上一篇    下一篇

Preparation of cross-linked enzyme aggregates of nitrile hydratase ES-NHT-118 from E. coli by macromolecular cross-linking agent

Liya Zhou1,2, Haixia Mou1, Jing Gao1,2, Li Ma1, Ying He1, Yanjun Jiang1,2   

  1. 1 School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China;
    2 Hebei Provincial Key Lab of Green Chemical Technology and High Efficient Energy Saving, Hebei University of Technology, Tianjin 300130, China
  • 收稿日期:2016-05-19 修回日期:2016-08-27 出版日期:2017-04-28 发布日期:2017-06-03
  • 通讯作者: Liya Zhou, Jing Gao
  • 基金资助:
    Supported by the National Nature Science Foundation of China (Nos.21306039,21276060,21276062),the Natural Science Foundation of Hebei Province (B2015202082,B2016202027) and the Tianjin City High School Science&Technology Fund Planning Project (20140513).

Preparation of cross-linked enzyme aggregates of nitrile hydratase ES-NHT-118 from E. coli by macromolecular cross-linking agent

Liya Zhou1,2, Haixia Mou1, Jing Gao1,2, Li Ma1, Ying He1, Yanjun Jiang1,2   

  1. 1 School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China;
    2 Hebei Provincial Key Lab of Green Chemical Technology and High Efficient Energy Saving, Hebei University of Technology, Tianjin 300130, China
  • Received:2016-05-19 Revised:2016-08-27 Online:2017-04-28 Published:2017-06-03
  • Supported by:
    Supported by the National Nature Science Foundation of China (Nos.21306039,21276060,21276062),the Natural Science Foundation of Hebei Province (B2015202082,B2016202027) and the Tianjin City High School Science&Technology Fund Planning Project (20140513).

摘要: Cross-linked enzyme aggregates (CLEAs) of nitrile hydratase (NHase) ES-NHT-118 from Escherichia coli were prepared by using ammonium sulfate as precipitating agent followed by cross-linking with dextran polyaldehyde for the first time.In this process,egg white was added as protein feeder for facilitating the formation of CLEAs.The optimal conditions of the immobilization process were determined.Michaelis constants (Km) of free NHase and NHase CLEAs were also determined.The NHase CLEAs exhibited increased stability at varied pH and temperature conditions compared to its free counterpart.When exposed to high concentrations of acrylamide,NHase CLEAs also exhibited effective catalytic activity.

关键词: Immobilization, Enzyme, Biocatalysis, Nitrile hydratase

Abstract: Cross-linked enzyme aggregates (CLEAs) of nitrile hydratase (NHase) ES-NHT-118 from Escherichia coli were prepared by using ammonium sulfate as precipitating agent followed by cross-linking with dextran polyaldehyde for the first time.In this process,egg white was added as protein feeder for facilitating the formation of CLEAs.The optimal conditions of the immobilization process were determined.Michaelis constants (Km) of free NHase and NHase CLEAs were also determined.The NHase CLEAs exhibited increased stability at varied pH and temperature conditions compared to its free counterpart.When exposed to high concentrations of acrylamide,NHase CLEAs also exhibited effective catalytic activity.

Key words: Immobilization, Enzyme, Biocatalysis, Nitrile hydratase