BioChem - DOS

Distinct polymer extraction and cellulose DP reduction for complete cellulose hydrolysis under mild chemical pretreatments in sugarcane

Carbohydrate polymers

Hu, Meng; Yu, Hua; Li, Yu; Li, Ao; Cai, Qiuming; Liu, Peng; Tu, Yuanyuan; Wang, Yanting; Hu, Ruofei; Hao, Bo; Peng, Liangcai; Xia, Tao

<P><B>ABSTRACT</B></P> <P>In this study, liquid hot water (LHW) and chemical (H<SUB>2</SUB>SO<SUB>4</SUB>, NaOH, CaO) pretreatments were performed in <I>Saccharum</I> species including sugarcane bagasse. In comparison, the LHW and CaO pretreatments significantly enhanced biomass enzymatic hydrolysis, leading to much high bioethanol yield obtained at 19% (% dry matter) with an almost complete hexoses-ethanol conversion in the desirable So5 bagasse sample. Despite the LHW and CaO are distinctive for extracting hemicellulose and lignin, both pretreatments largely reduced cellulose degree of polymerization for enhanced lignocellulose enzymatic saccharification. Further chemical analysis indicated that the pretreated So5 sample had much lower cellulose crystalline index, hemicellulosic Xyl/Ara and lignin S/H ratio than those of other biomass samples, which explained that the So5 had the highest bioethanol yield among <I>Saccharum</I> species. Therefore, a mechanism model was proposed to elucidate how mild pretreatments could enhance biomass enzymatic saccharification for a high bioethanol production in the desirable sugarcane bagasse.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Mild CaO and LHW pretreatments largely enhanced biomass saccharification. </LI> <LI> Much reduced cellulose degree of polymerization from CaO and LHW pretreatments. </LI> <LI> Distinct extractions of lignin and hemicelluloses by CaO and LHW pretreatments. </LI> <LI> Co-supplement with Tween-80 leads to complete sugar-ethanol conversion. </LI> </UL> </P>

2018

Elsevier

0144-8617

202

pp.434-443

10.1016/j.carbpol.2018.08.039

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART89961605

Sugarcane bagasse; Chemical pretreatment; Cellulose features; Lignocellulose saccharification; Bioethanol production