Abstract
The effect of kaolinite on the enzymatic chiral hydrolysis of methyl dichlorprop enantiomers (R,S)-methyl-2-(2,4-dichlorophenoxy) propanoic acid, 2,4-DPM) was investigated using chiral gas chromatography. Compared with the control without kaolinite, the enantiomeric ratio (ER) increased from 1.35 to 8.33 and the residual ratio of 2,4-DPM decreased from 60.89% to 41.55% in the presence of kaolinite. Kaolinite likely had emotion influence on lipase activity and its enantioselectivity. Moreover, the amount of kaolinite added was also found to be a sensitive factor affecting the enantioselective hydrolysis of 2,4-DPM. Fourier transform infrared (FTIR) spectroscopy studies of the interaction of lipase with kaolinite provided insight into the molecular structure of the complex and offered explanation of the effects of kaolinite on enzymatic hydrolysis of 2,4-DPM. Spectra showed that the effect of kaolinite on the hydrolysis of 2,4-DPM was affected by adsorption of lipase on kaolinite and changes of adsorbed lipase conformation, which led to the modified enantioselectivity.
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Project supported by the National Natural Science Foundation of China (No. 30270767) and the National Nature Science Foundation of China for the Distinguished Young Scholars Program (No. 20225721)
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Zhao-hua, F., Yue-zhong, W. & Wei-ping, L. Influence of kaolinite on chiral hydrolysis of methyl dichlorprop enantiomers. J. Zhejiang Univ. Sci. B 6, 1028–1032 (2005). https://doi.org/10.1007/BF02888496
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DOI: https://doi.org/10.1007/BF02888496