Abstract
This study aimed to correlate the efficiency of enzymatic hydrolysis of the cellulose contained in a sugarcane bagasse sample pretreated with dilute H2SO4 with the levels of independent variables such as initial content of solids and loadings of enzymes and surfactant (Tween 20), for two cellulolytic commercial preparations. The preparations, designated cellulase I and cellulase II, were characterized regarding the activities of total cellulases, endoglucanase, cellobiohydrolase, cellobiase, β-glucosidase, xylanase, and phenoloxidases (laccase, manganese and lignin peroxidases), as well as protein contents. Both extracts showed complete cellulolytic complexes and considerable activities of xylanases, without activities of phenoloxidases. For the enzymatic hydrolyses, two 23 central composite full factorial designs were employed to evaluate the effects caused by the initial content of solids (1.19–4.81%, w/w) and loadings of enzymes (1.9–38.1 FPU/g bagasse) and Tween 20 (0.0–0.1 g/g bagasse) on the cellulose digestibility. Within 24 h of enzymatic hydrolysis, all three independent variables influenced the conversion of cellulose by cellulase I. Using cellulase II, only enzyme and surfactant loadings showed significant effects on cellulose conversion. An additional experiment demonstrated the possibility of increasing the initial content of solids to values much higher than 4.81% (w/w) without compromising the efficiency of cellulose conversion, consequently improving the glucose concentration in the hydrolysate.
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The authors are grateful to FAPESP, CNPq, and CAPES for financial support.
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This article is based on a presentation at the 32nd Symposium on Biotechnology for Fuels and Chemicals.
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Santos, V.T.O., Esteves, P.J., Milagres, A.M.F. et al. Characterization of commercial cellulases and their use in the saccharification of a sugarcane bagasse sample pretreated with dilute sulfuric acid. J Ind Microbiol Biotechnol 38, 1089–1098 (2011). https://doi.org/10.1007/s10295-010-0888-1
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DOI: https://doi.org/10.1007/s10295-010-0888-1