Abstract
(R)-Mandelic acid (R-MA) is a key precursor for the synthesis of semi-synthetic penicillin, cephalosporin, anti-obesity drugs, antitumor agents, and chiral resolving agents for the resolution of racemic alcohols and amines. In this study, an enzymatic method for the large-scale production of R-MA by a stereospecific nitrilase in an aqueous system was developed. The nitrilase activity of the Escherichia coli BL21(DE3)/pET-Nit whole cells reached 138.6 U/g in a 20,000-L fermentor. Using recombinant E. coli cells as catalyst, 500 mM R,S-mandelonitrile (R,S-MN) was resolved into 426 mM (64.85 g/L) R-MA within 8 h, and the enantiomeric excess (ee) value of R-MA reached 99%. During the purification process, pure R-MA with a recovery rate of 78.8% was obtained after concentration and crystallization. This study paved the foundation for the upscale production of R-MA using E. coli whole cells as biocatalyst.
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Acknowledgements
This work was financially supported by grants from the Natural Science from Education Department of Anhui Province (No. KJ2018A0563), Talent Research Foundation of Hefei University (No. 18-19RC10), Key Research and Development Plan of Anhui Province (No. 1804a07020120), Major Science and Technology Projects in Anhui Province (No. 18030701145).
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Zhang, XH., Wang, CY., Cai, X. et al. Upscale production of (R)-mandelic acid with a stereospecific nitrilase in an aqueous system. Bioprocess Biosyst Eng 43, 1299–1307 (2020). https://doi.org/10.1007/s00449-020-02326-4
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DOI: https://doi.org/10.1007/s00449-020-02326-4