Abstract
Glucose isomerase is the important enzyme for the production of high fructose corn syrup (HFCS). One-step production of HFCS containing more than 55% fructose (HFCS-55) is receiving much attention for its industrial applications. In this work, the Escherichia coli harboring glucose isomerase mutant TEGI-W139F/V186T was immobilized for efficient production of HFCS-55. The immobilization conditions were optimized, and the maximum enzyme activity recovery of 92% was obtained. The immobilized glucose isomerase showed higher pH, temperature, and operational stabilities with a K m value of 272mM and maximum reaction rate of 23.8mMmin-1. The fructose concentration still retained above 55% after the immobilized glucose isomerase was reused for 10cycles, and more than 85% of its initial activity was reserved even after 15 recycles of usage at temperature of 90°C. The results highlighted the immobilized glucose isomerase as a potential biocatalyst for HFCS-55 production.
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