Kinetically Controlled Enzyme-Catalyzed Synthesis of Kyotorphin

Abstract
Regarding the α-chymotrypsin-catalyzed synthesis of Z-TyrArg-NH2, the effect on the reaction yield of the following experimental factors is discussed: DMF/buffer proportions, reaction temperature, and donor/nucleophile ratios. The experimental design shows that relatively better yields are obtained by increasing the reaction temperature and lowering the cosolvent proportion while maintaining a slight excess of nucleophile. The ascensional line reaches an optimal response surface very flat voided of a well-defined maximum.