Abstract
In order to illustrate the underlining mechanism of the effect of high pressure on lipases from different resources, the influence of compressed carbon dioxide treatment on the esterification activities and conformation of the three lipases Candida rugosa lipase (CRL), Pseudomonas fluorescens lipase, and Rhizopus oryzae lipase was investigated in the present work. The results showed that the lipases activities were significantly enhanced in most of high-pressure treatments, except the pressure had a negative effect on CRL activity in supercritical condition. Mild depressurization rate could remain the lipase’s activity by protecting its rigid structure under supercritical fluid. Conformational analysis by Fourier transform-infrared spectrometry and fluorescence emission spectra revealed that the variances of lipase activity after high-pressure treatment were correlated with the changes of its α-helix content and fluorescence intensity. Additionally, transesterification catalyzed by three lipases in supercritical carbon dioxide were conducted, and 87.2 % biodiesel conversion was obtained by CRL after 3 h, resulting in a great reduction of reaction time.
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Acknowledgments
The authors acknowledge the financial support by the National Natural Science Foundation of P. R. China (NSFC; Nos. 31070089 and 31170078), the National High Technology Research and Development Program of P. R. China (863 Program; No. 2011AA02A204). Many thanks are due to Miss Xiaoman Gu and Hong Chen from the Analytical and Testing Center of HUST for FT-IR data analyses.
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Chen, D., Peng, C., Zhang, H. et al. Assessment of Activities and Conformation of Lipases Treated with Sub- and Supercritical Carbon Dioxide. Appl Biochem Biotechnol 169, 2189–2201 (2013). https://doi.org/10.1007/s12010-013-0132-3
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DOI: https://doi.org/10.1007/s12010-013-0132-3