J L Rakels, A J Straathof, J J Heijnen
Index: Enzyme Microb. Technol. 15(12) , 1051-6, (1993)
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The enantiomeric ratio (E) is commonly used to characterize the enantioselectivity in enzyme-catalyzed kinetic resolution. In this paper this parameter is directly derived from the enantiomeric excess of substrate and product. This is formally more correct than using Chen's equation after calculating the degree of conversion from both ee values using the relation of Sih and Wu. New expressions and useful graphs have been generated for reversible and irreversible uni-uni reactions. The theoretical predictions have been verified experimentally for various reactions. Values for E and the thermodynamic equilibrium constant, KEQ, were obtained for a (DL)-dehalogenase-catalyzed dehalogenation, a hydrolysis reaction by porcine pancreatic lipase, and for C. Cylindracea lipase-catalyzed esterification and transesterification. In view of the current developments in the field of chiral analysis, this method is an easily available tool in the quantitative treatment of enzyme-catalyzed resolution of enantiomers.
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