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DA-F127 Hydrogel Embedded Immobilized the Nitrile Hydratase-Containing Cells |
ZHANG Ying,WANG Ying,YANG Li-rong,WU Jian-ping() |
College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China |
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Abstract Nitrile hydratase are enzymes that catalyze the conversion of nitriles to their corresponding amides. There are many problems in the catalytic process of free cells containing nitrile hydratases, such as low cell utilization rate and the high cost of later separation, which can be solved effectively by immobilization of cells. Several commonly embedding immobilization methods by evaluating the reaction batches and the activity recovery rate of immobilized enzymes with nitrile hydratase containing recombinant E.coli cells as the research object to find a suitable immobilization method were compared.The results showed that DA-F127 was the most suitable material for immobilization of recombinant E. coli cells. When the concentration of DA-F127 was 15%, the UV irradiation distance was 20cm, the irradiation time was 6min, and the cell content was 20mg/g carrier, the recovery rate of enzyme activity is 89.74%, and it could be reused up for 9 batches to covert 150g/L 3-cyanopyridine. The conversion rate of the ninth batch could reach to 98.26%. The nicotinamide yield was increased by 12 times compared with the same amount of free cell catalysis.
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Received: 12 March 2019
Published: 17 December 2019
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Corresponding Authors:
Jian-ping WU
E-mail: wjp@zju.edu.cn
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