其中模型9、10为以谷氨酸的r羧基缩合的聚肽。 测定了这些模型在各种不同的温度、溶液组成、pH、底物浓度等条件下催化乙酸对硝基苯酯(PNPA)水解的速率常数并与组氨酸的催化速率常数比较后,发现,除模型3、4外,其他模型的催化水解速率常数都比组氨酸的催化水解速率常数大,说明在这 Models 9 and 10 are poly-peptides condensed with carboxyl groups of glutamic acid. The rate constants for the hydrolysis of p-nitrophenyl acetate (PNPA) under different conditions of temperature, solution composition, pH and substrate concentration were determined and compared with the catalytic rate constants of histidine. Except for models 3 and 4, the catalytic hydrolysis rate constants of other models are higher than the catalytic hydrolysis rate constant of histidine