微球载体固定化纤维素酶的反应动力学模型研究

Kinetics Model of Spherical Immobilized Cellulase

建立了固定化纤维素酶的反应动力学模型,该模型以米氏方程为基础并考虑了产物竞争性抑制的影响。在此模型的基础上进行模拟,系统研究了产物竞争性抑制、内扩散限制、溶液中的宏观底物浓度、载体大小等因素对球形载体内部的底物、产物浓度分布和效率因子的影响。产物竞争性抑制的存在将增加载体颗粒内的底物浓度,对效率因子的影响较小。底物内扩散系数或者反应体系中底物浓度增大时,载体颗粒内的底物浓度和效率因子都将增大。载体粒径增大,载体颗粒内的底物浓度和效率因子均减小。

A kinetics model was developed for predicting and simulating immobilized cellulase performance, which follows Michaelis-Menten kinetics with competitive product inhibition. Taking into account the effects of competitive product inhibition, inner diffusional limitation, substrate concentration and carrier size, the substrate distribution and the product distribution in carriers were investigated, and the effectiveness factors were also calculated over a wide range of parameters. The effects of competitive product inhibition are shown to increase the substrate concentration in the carrier, and, additionally, to increase the effectiveness factors slightly. With the increase of inner diffusion coefficient, both the effectiveness factors and the substrate concentration in the carrier increase. As the carrier size increases, on the other hand, these values decrease. The effectiveness factors and the substrate concentration in the carrier are found to increase when substrate concentration in the reaction system increases.