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在H_2O,Mo_2SO-H_2O,Dioxane-H_2O,t-BuOH-H_2O体系中,羧甲基糖淀粉钠(NaCMA)对不同链长的羧酸对硝基苯酚酯的水解有显著的加速作用,并表明,即使在受物发生部分簇集的情况下,NaCMA的催化作用仍呈饱和动力学。讨论了有机溶剂、受物的链长、受物的聚集状态对包结络合物的解离常数K_d及催化酯水解速率常数k_o的影响。实验结果表明,NaCMA-受物包结络合物在纯水中最稳定,有机溶剂的存在不同程度地降低了NaCMA催化酯水解的能力和包结络合物的稳定性。
In the system of H_2O, Mo_2SO_H_2O, Dioxane-H_2O and t-BuOH-H_2O, sodium carboxymethyl starch glycolate (NaCMA) significantly accelerates the hydrolysis of carboxylic acid p-nitrophenol esters with different chain lengths, , The catalytic effect of NaCMA is still saturated kinetics even in the event of partial clustering of the acceptor. The effects of the organic solvent, the length of the acceptor, the aggregation state of the reactants on the dissociation constant K_d of the entrapped complex and the k_o constant of the catalytic ester hydrolysis rate were discussed. The experimental results show that the NaCMA-acceptor inclusion complex is the most stable in pure water, and the presence of organic solvents reduces the ability of NaCMA to catalyze the ester hydrolysis and the stability of the inclusion complex to different extents.