Abstract
A novel two-phase partitioning bioreactor (TPPB) modified by polysulfone (PSF) microspheres and immobilized enzyme (novozym-435) was formed, and the resulting TPPB was applied into mandelic acid chiral separation. The PSF microspheres containing n-hexanol (named PSF/hexanol microspheres) was prepared by using the phase inversion method, which was used as the organic phase. Meanwhile, the immobilized enzyme novozym-435 was used as a biocatalyst. The water phase was composed of the phosphate buffer solution (PBS). (R, S)-Methyl mandelate was selected as the substrate to study enzymatic properties. Different reaction factors have been researched, such as pH, reaction time, temperature and the quantity of biocatalyst and PSF/hexanol microspheres added in. Finally, (S)-mandelic acid was obtained with an 80 % optical purity after 24 h in the two-phase partitioning bioreactor. The enantiomeric excess (eep) values were very low in the water phase, in which the highest eep value was only 46 %. The eep of the two-phase partitioning bioreactor had been enhanced more obviously than that catalyzed in the water phase.
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Acknowledgments
The authors thank the financial supports from the National Natural Science Foundation of China (No. 21374045, No. 21074049), the Fundamental Research Funds for the Central Universities (No. lzujbky-2014-186), the scientific research ability training of under-graduate students majoring in chemistry by the two patters based on the tutorial system and top students (J1103307) and the Opening Foundation of State Key Laboratory of Applied Organic Chemistry (SKLAOC-2009-35).
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Wang, X., Cui, Y., Chen, X. et al. Mandelic acid chiral separation utilizing a two-phase partitioning bioreactor built by polysulfone microspheres and immobilized enzymes. Bioprocess Biosyst Eng 38, 429–435 (2015). https://doi.org/10.1007/s00449-014-1283-5
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DOI: https://doi.org/10.1007/s00449-014-1283-5