Impact of wet aerobic pretreatments on cellulose accessibility and bacterial communities in rape straw

• Published in: Bioresource technology Vol. 237; pp. 31 - 38
• Main Authors: Tian, Jiang-Hao, Pourcher, Anne-Marie, Bize, Ariane, Wazeri, Alaa, Peu, Pascal
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.08.2017; Elsevier
• Subjects: Biological pretreatment; Biomass; Brassica rapa; Cellulase; Cellulose; Cellulose accessibility to cellulose; Crop residues; Environmental Sciences; Lignin; Rape straw; Rape straw; Cellulose accessibility to cellulose; Lignin; Crop residues; Biological pretreatment; LIGNIN DEGRADATION; CROP RESIDUES; PROTEIN; LIGNINE; AMMONIA; ENZYMATIC-HYDROLYSIS; WHEAT-STRAW; IDENTIFICATION; ANAEROBIC-DIGESTION; RAPE STRAW; ACCESSIBILITY TO CELLULOSE; PEROXIDASE; LIGNOCELLULOSE FRACTIONATION; BIOLOGICAL PRETREATMENT; BIOMASS; CELLULOSE; LIGNIN
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2017.03.142

•Rape straw is a potential feedstock for bioethanol and anaerobic digestion sectors.•A three-days aerobic incubation could improve the cellulose accessibility of the studied straw.•A biological pretreatment of straws for increasing cellulose accessibility is proposed. A new pretreatment method of lignocellulosic biomass was explored by using a wet aerobic process with an alkaline lignin and a mineral salt solution. This treatment significantly improved structural modification of rape straw used as substrate model in this study. Change in cellulose accessibility to cellulase of rape straw rose up to six fold within the first days of this pretreatment without generated significant modification of van Soest lignocellulose fractionation. The biological pretreatment apply to rape straw induced a high microbial activity revealed by quantitative PCR and sequencing techniques, suggesting that bacteria including Xanthomonadales and Sphingobacteriales may be involved in this lignocellulosic biomass transformation. Moreover, results of this work demonstrate that the endogenous microbial community associated with rape straw plays a key role in its alteration.