Title Enzymatic saccharification of acid pretreated corn stover: Empirical and fractal kinetic modelling.
Authors Wojtusik, Mateusz , ZURITA GOTOR, MAURICIO, Villar, Juan C , Ladero, Miguel , Garcia-Ochoa, Felix
External publication No
Means Bioresour Technol
Scope Article
Nature Científica
JCR Quartile 1
SJR Quartile 1
JCR Impact 5.65100
SJR Impact 2.21500
Area International
Publication date 01/11/2016
DOI 10.1016/j.biortech.2016.08.069
Abstract Enzymatic hydrolysis of corn stover was studied at agitation speeds from 50 to 500rpm in a stirred tank bioreactor, at high solid concentrations (20% w/w dry solid/suspension), 50°C and 15.5mgprotein·gglucane(-1). Two empirical kinetic models have been fitted to empirical data, namely: a potential model and a fractal one. For the former case, the global order dramatically decreases from 13 to 2 as agitation speed increases, suggesting an increment in the access of enzymes to cellulose in terms of chemisorption followed by hydrolysis. For its part, the fractal kinetic model fits better to data, showing its kinetic constant a constant augmentation with increasing agitation speed up to a constant value at 250rpm and above, when mass transfer limitations are overcome. In contrast, the fractal exponent decreases with rising agitation speed till circa 0.19, suggesting higher accessibility of enzymes to the substrate.
Keywords Corn stover, Empirical model, Enzymatic hydrolysis, Fractal model, Kinetic modelling, Stirrer speed
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