4.8 Article

New two-stage pretreatment for the fractionation of lignocellulosic components using hydrothermal pretreatment followed by imidazole delignification: Focus on the polysaccharide valorization

期刊

BIORESOURCE TECHNOLOGY
卷 285, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2019.121346

关键词

Biorefinery; Fractionation; Lignocellulose; Oligosaccharides; Enzymatic hydrolysis

资金

  1. Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES, Brazil)
  2. Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq, Brazil)
  3. Fundacao para a Ciencia e a Tecnologia (FCT, Portugal) [IF/00471/2015]
  4. CAPES (Brazil) [CAPES 371/14, 0005/2015, FCT/1909/27/2/2014/S, 23038.002463/2014-98]
  5. FCT/MEC (Portugal) [CAPES 371/14, 0005/2015, FCT/1909/27/2/2014/S, 23038.002463/2014-98]

向作者/读者索取更多资源

The combination of hydrothermal pretreatment followed by delignification with imidazole was evaluated for the first time as a potential selective two-stage fractionation for elephant grass, aiming at obtaining pure fractions susceptible to conversion to high value-added products. In addition, the recovery of cellulose and hemicelluloses and enzymatic hydrolysis yield of pretreated elephant grass were evaluated. Hydrothermal pretreatment at 180 degrees C under non-isothermal conditions allowed obtaining a liquor rich mainly in xylo- and glucooligo-saccharides, as well as pentoses. Subsequent treatment of the recovered solid fraction with imidazole at 140 degrees C for 182.5 min resulted in 83.8 wt% delignification and cellulose enrichment of 97.7 wt%. The solids obtained from the two-stage pretreatment process also permitted high glucan to glucose conversion through enzymatic hydrolysis using Cellic CTec2 (99.0 mol%) or an enzymatic complex of Penicillium echinulatum (96.3 mol%).

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