Abstract
Immobilization of cis-epoxysuccinate hydrolase-containing E. coli for d(−)-tartaric acid production was screened by various methods. The highest recovery of activity was obtained by entrapment in κ-carrageenan gel. 23.6 g biomass/l and 43.4 g κ-carrageenan/l were the best immobilization conditions optimized by response surface methodology with 83% yield (114 U/g). Cell autolysis was observed after immobilization. Immobilized cells showed high pH (5–10) stability, thermal (up to 65°C) stability, conversion rate (>99.5%), enantioselectivity (ee > 99.6%), and were less affected by metal ions and surfactants compared with free cells. Conversion rate for immobilized cells preserved 93% after 10 repeated batches (5% for free cells).
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This work was funded by Hangzhou Bioking Biochemical Engineering Co., Ltd.
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Pan, H., Bao, W., Xie, Z. et al. Immobilization of Escherichia coli cells with cis-epoxysuccinate hydrolase activity for d(−)-tartaric acid production. Biotechnol Lett 32, 235–241 (2010). https://doi.org/10.1007/s10529-009-0134-y
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DOI: https://doi.org/10.1007/s10529-009-0134-y