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Natural deep eutectic solvent mediated extrusion for continuous high-solid pretreatment of lignocellulosic biomass

文献类型： 外文期刊

作者： Ai, Binling 1 ; Li, Wenqi 2 ; Woomer, Joseph 2 ; Li, Mi 3 ; Pu, Yunqiao 4 ; Sheng, Zhanwu 1 ; Zheng, Lili 1 ; Adedeji, Ak 1 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Haikou Expt Stn, Haikou 571101, Hainan, Peoples R China

2.Univ Kentucky, Biosyst & Agr Engn, Lexington, KY 40546 USA

3.Univ Tennessee, Inst Agr, Ctr Renewable Carbon, Dept Forestry Wildlife & Fisheries, Knoxville, TN 37996 USA

4.Oak Ridge Natl Lab, Biosci Div, Ctr BioEnergy Innovat, Joint Inst Biol Sci, Oak Ridge, TN 37831 USA

5.Univ Tennessee, Dept Chem & Biomol Engn, Knoxville, TN 37996 USA

期刊名称：GREEN CHEMISTRY （ 影响因子：10.182； 五年影响因子：10.607 ）

ISSN： 1463-9262

年卷期： 2020 年 22 卷 19 期

页码：

收录情况： SCI

摘要： Several deep eutectic solvents (DESs) have been demonstrated to be highly effective for lignocellulosic biomass pretreatment, combining the advantages of simple synthesis, relatively low chemical cost and better biocompatibility. However, low biomass loading that is usually involved with DES pretreatment hinders its practical use. In this study, a twin-screw extruder was used for pretreating biomass sorghum bagasse at solid loadings up to 50%, mediated by a neutral-pH DES, choline chloride: glycerol (ChCl : Gly). This continuous extrusion process led to high glucose and xylose yields of >85% from enzymatic saccharification of the pretreated sorghum. A combination of microscopic, spectroscopic, and X-ray diffraction analyses demonstrate a high degree of defibration and disruption of the biomass cell wall structures; however, little or no change in chemical compositions. Further results from gel permeation chromatographic (GPC) and nuclear magnetic resonance (NMR) spectroscopic analyses indicate that ChCl : Gly-mediated extrusion preserved the basic lignin structural characteristics with no significant differences between extruded biomass at a solid loading of 30% and 50%. This study demonstrates the potential of DES-mediated extrusion as a highly effective continuous high-solid biomass pretreatment technology for industrially relevant applications.

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