Abstract
In this study, a new biocatalyst was prepared by immobilizing Candida rugosa lipase epichlorohydrin-functionalized onto the surface of the nanoparticles. Magnetite nanoparticles were obtained by chemical co-precipitation method of Fe2+ and Fe3+, and then the prepared uncoated and coated nanoparticles were characterized by XRD, FT-IR and TGA. Lipase was covalently attached to activated nanoparticles. The catalytic properties of free and immobilized lipases were determined. It was found that the optimum temperature for free and immobilized lipases was 30 °C and 35 °C, respectively. The optimum pH values were found to be 7.0 and 8 for free and immobilized lipases, respectively. Immobilized lipase was found to retain significant activity even after the seventh use. In the final section of the study, optically pure compounds were obtained by carrying out the enantioselective hydrolysis studies of racemic esters by using immobilized lipase. Enantiomeric excesses of the products in the enantioselective hydrolysis of racemic ibuprofen and naproxen methyl ester and racemic butyl mandelate were determined to be 94.93, 77.30 and 68.15, respectively.
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Acknowledgements
The authors thank to the Scientific and Technical Research Council of Turkey (TUBITAK) and the Scientific Research Projects Unit of Dicle University for their financial support to this work partly achieved from Reşit Çakmak’s Ph.D. thesis, which was prepared under the supervision of Prof Dr. Giray Topal. On the other hand, biochemist Dr. Ercan Çınar studied as a researcher in the section the determination of enzymatic activities of free and immobilized lipases in this doctoral thesis work.
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This research was supported by TUBITAK (grant number:113Z773) and Dicle University (grant number:14-ZEF-16).
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Çakmak, R., Topal, G. & Çınar, E. Covalent Immobilization of Candida rugosa Lipase on Epichlorohydrin-Coated Magnetite Nanoparticles: Enantioselective Hydrolysis Studies of Some Racemic Esters and HPLC Analysis. Appl Biochem Biotechnol 191, 1411–1431 (2020). https://doi.org/10.1007/s12010-020-03274-1
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DOI: https://doi.org/10.1007/s12010-020-03274-1