BioChem - DOS

Ecofriendly lignocellulose pretreatment to enhance the carboxylate production of a rumen-derived microbial consortium

Bioresource technology : biomass, bioenergy, biowastes, conversion technologies, biotransformations, production technologies

Lazuka, Adè le; Roland, Cé cile; Barakat, Abdellatif; Guillon, Fabienne; O'Donohue, Michael; Hernandez-Raquet, Guillermina

<P><B>Abstract</B></P> <P>Innovative dry chemo- and chemo-mechanical pretreatments form an interesting approach for modifying the native physico-chemical composition of lignocellulose facilitating its microbial conversion to carboxylates. Here, the impact of four dry-pretreatment conditions on the microbial transformation of wheat straw was assessed: milling to 2mm and 100&micro;m, and NaOH chemical impregnation at high substrate concentrations combined with milling at 2mm and 100&micro;m. Pretreatment effect was assessed in the light of substrate structure and composition, its impact on the acidogenic potential and the major enzyme activities of a rumen-derived microbial consortium RWS. Chemo-mechanical pretreatment strongly modified the substrate macroporosity. The highest carboxylate production rate was reached after dry chemo-mechanical treatment with NaOH at 100&micro;m. A positive impact of the dry chemo-mechanical treatment on xylanase activity was observed also. These results underline that increasing substrate macroporosity by dry chemo-mechanical pretreatment had a positive impact on the microbial acidogenic potential.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Dry chemo-mechanical pretreatments impact biomass crystallinity and macroporosity. </LI> <LI> Dry chemo-mechanical pretreatment increased the carboxylate production rate by RWS. </LI> <LI> Dry chemo-mechanical pretreated biomass enhances the microbial xylanase activity. </LI> <LI> Initial biomass macroporosity correlated with the biological acidogenic potential. </LI> </UL> </P>

2017

Elsevier

cc-by

0960-8524

236

pp.225-233

10.1016/j.biortech.2017.03.083

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART77728015

https://hal.science/hal-01607636/file/Lazuka-BT-2017-manuscript-IATE_1.pdf

Lignocellulose bioconversion; Anaerobic microbial consortium; Carboxylate production; Enzymes; Dry chemo-mechanical pretreatment