Abstract
l-Menthyl α-D-glucopyranoside (α-MenG) is a glycoside derivative of l-menthol with improved water-solubility and new flavor property as a food additive. α-MenG can be synthesized through biotransformation, but its scale-up production was rarely reported. In this study, the properties of an α-glucosidase from Xanthomonas campestris pv. campestris 8004 (Agl-2) in catalyzing the glucosylation of menthol was investigated. Agl-2 can almost completely glycosylate l-menthol (> 99%) when using 1.2 M maltose as glycosyl donor. Accumulated glucose resulted from maltose hydrolysis and transglycosylation caused the inhibition of the glucosylation rate (40% reduction of the glucosylation rate in the presence of 1.2 M glucose) which can be avoided through whole-cell catalysis with recombinant E. coli. Interestingly, in spite of the poor solubility of menthol, the productivity of α-MenG reached 24.7 g/(L·h) in a 2 L catalyzing system, indicating industrialization of the reported approach.
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Acknowledgements
This study was funded by the National Nature Science Foundation of China (No. 31601445, No. 31601390 and No. 21572206).
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Chen, L., Zhou, Y., Lu, C. et al. Efficient production of l-menthyl α-glucopyranoside from l-menthol via whole-cell biotransformation using recombinant Escherichia coli. Biotechnol Lett 43, 1757–1764 (2021). https://doi.org/10.1007/s10529-021-03100-6
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DOI: https://doi.org/10.1007/s10529-021-03100-6