期刊
BIORESOURCE TECHNOLOGY
卷 102, 期 10, 页码 5938-5946出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2011.03.011
关键词
Lignin; Hydrophobicity; Cellulases; Adsorption; Saccharification
资金
- French National Bioenergies Program HYPAB [ANR-05-PNRB-BIOE-011]
The present study aimed to determine the impact of cell wall composition and lignin content on enzyme adsorption and degradability. Thioacidolysis analysis of residual lignins in wheat straw after steam-explosion or organosolv pretreatment revealed an increase in lignin condensation degree of 27% and 33%, respectively. Surface hydrophobicity assessed through wettability tests decreased after the pretreatments (contact angle decrease of 20-50%), but increased with enzymatic conversion (30% maximum contact angle increase) and correlatively to lignin content. Adsorption of the three major cellulases Cel7A, Cel6A and Cel7B from Trichoderma reesei decreased with increasing hydrolysis time, down to 7%, 31% and 70% on the sample with the highest lignin content, respectively. The fraction of unspecifically bound enzymes was dependent both on the enzyme and the lignin content. Adsorption and specific activity were shown to be inversely proportional to lignin content and hydrophobicity, suggesting that lignin is one of the factors restricting enzymatic hydrolysis. (C) 2011 Elsevier Ltd. All rights reserved.
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