The effect of crystallinity of cellulose on the rate of reducing sugars production by heterogeneous enzymatic hydrolysis.

Abstract:

:A kinetic model is devised, from the reaction mechanism steps, to predict the rate of reducing sugar production by hydrolysis of two types of cellulose, namely, amorphous carboxymethylcellulose (CMC) and highly crystalline wood shavings, using Aspergillus niger cellulase. Experimental results in a stirred batch reactor at 40 degrees C show that the production of reducing sugar reduced at much shorter times for wood shavings in comparison to CMC at the same initial substrate concentration. The experimental results are used to determine the kinetic parameters of the model equations. The significance of crystallinity was determined using inert fraction coefficient, which is assumed to be constant and equals 0.05 and 0.98 for CMC and wood shavings, respectively. It is shown there is a good agreement between the experimental results and proposed kinetic model predictions. The effect of the inert fraction coefficient on the production of reducing sugar by the enzymatic hydrolysis of cellulose is also determined. It is found that the cellulase used extracted from A. niger is much more sensitive towards the substrate structure in comparison to that extracted from Trichoderma reesei.

journal_name

Bioresour Technol

journal_title

Bioresource technology

authors

Al-Zuhair S

doi

10.1016/j.biortech.2007.09.003

subject

Has Abstract

pub_date

2008-07-01 00:00:00

pages

4078-85

issue

10

eissn

0960-8524

issn

1873-2976

pii

S0960-8524(07)00743-2

journal_volume

99

pub_type

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