Modeling the Reaction Kinetics of the Enzymatic Hydrolysis of Lignocellulosic Biomass.

摘要

Maximizing enzymatic hydrolysis performance can be achieved through the combination of experimental work and modeling. The present work utilizes an enzymatic hydrolysis model based on reaction kinetics, Langmuir adsorption isotherms, and product inhibition of enzymes (beta-glucosidase, cellobiohydrolase, and endoglucanase). The model was developed from a 10% w/w corn stover system. Glucose yield sensitivity to changes in parameter values was assessed and linked to biomass and enzyme characteristics. A commercial enzyme cocktail (CEC) was subsequently characterized by FPLC and gel electrophoresis to identify key enzymes/activities, and the CEC was used in the enzymatic hydrolysis of 20% w/w steam-exploded hardwood. The model was applied to experimental data from the enzymatic hydrolysis of the steam-exploded hardwood, which provided characteristic reaction rate and inhibition parameters consistent with cellulose and xylan hydrolysis. These model-based analyses enhanced understanding of hydrolysis at commercially relevant solids loadings, while identifying pathways to improve enzyme cocktails and enhance biomass conversion.