Adsorption of cellulase from Trichoderma reesei on cellulose and lignacious residue in wood pretreated by dilute sulfuric acid with explosive decompression

Biotechnology and Bioengineering
H OoshimaA O Converse


The adsorption of cellulase on cellulose and a lignacious residue was examined by using cellulase from Trichoderma reesei, hardwood pretreated by dilute sulfuric acid under high pressure, and a lignacious residue prepared by a complete enzymatic hydrolysis of the pretreated wood. A significant amount of cellulase was found to adsorb on the lignacious residue during the hydrolysis of the pretreated wood. Hence, the adsorption of enzyme on the lignacious residue as well as cellulose must be taken into account in the development of the hydrolysis kinetics. It was found that the adsorption of enzyme on cellulose and on the lignacious residue could be represented by Langmuir type isotherms. The data show that the pretreatment at a higher temperature results in more enzyme adsorption on the cellulose fraction and less on the lignacious residue fraction. The relationship between the hydrolysis rate and the amount of enzyme adsorbed is discussed.


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