title: Efficient Cleavage of Lignin-Carbohydrate Complexes and Ultrafast Extraction of Lignin Oligomers from Wood Biomass by Microwave-Assisted Treatment with Deep Eutectic Solvent.
abstract: Lignocellulosic biomass is an abundant and renewable resource for the production of biobased value-added fuels, chemicals, and materials, but its effective exploitation by an energy-efficient and environmentally friendly strategy remains a challenge. Herein, a facile approach for efficiently cleaving lignin-carbohydrate complexes and ultrafast fractionation of components from wood by microwave-assisted treatment with deep eutectic solvent is reported. The solvent was composed of sustainable choline chloride and oxalic acid dihydrate, and showed a hydrogen-bond acidity of 1.31. Efficient fractionation of lignocellulose with the solvent was realized by heating at 80 °C under 800 W microwave irradiation for 3 min. The extracted lignin showed a low molecular weight of 913, a low polydispersity of 1.25, and consisted of lignin oligomers with high purity (ca. 96 %), and thus shows potential in downstream production of aromatic chemicals. The other dissolved matter mainly comprised glucose, xylose, and hydroxymethylfurfural. The undissolved material was cellulose with crystal I structure and a crystallinity of approximately 75 %, which can be used for fabricating nanocellulose. Therefore, this work promotes an ultrafast lignin-first biorefinery approach while simultaneously keeping the undissolved cellulose available for further utilization. This work is expected to contribute to improving the economics of overall biorefining of lignocellulosic biomass.
authors.affiliation: Key laboratory of Bio-based Material Science and Technology, Ministry of Education, Northeast Forestry University, Harbin, 150040, P. R. China.
authors.forename: Yongzhuang
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Key laboratory of Bio-based Material Science and Technology, Ministry of Education, Northeast Forestry University, Harbin, 150040, P. R. China.
authors.forename: Wenshuai
authors.initials: W
authors.lastname: Chen
authors.affiliation: Key laboratory of Bio-based Material Science and Technology, Ministry of Education, Northeast Forestry University, Harbin, 150040, P. R. China.
authors.forename: Qinqin
authors.initials: Q
authors.lastname: Xia
authors.affiliation: Key laboratory of Bio-based Material Science and Technology, Ministry of Education, Northeast Forestry University, Harbin, 150040, P. R. China.
authors.forename: Bingtuo
authors.initials: B
authors.lastname: Guo
authors.affiliation: Key laboratory of Bio-based Material Science and Technology, Ministry of Education, Northeast Forestry University, Harbin, 150040, P. R. China.
authors.forename: Qingwen
authors.initials: Q
authors.lastname: Wang
authors.affiliation: Key laboratory of Bio-based Material Science and Technology, Ministry of Education, Northeast Forestry University, Harbin, 150040, P. R. China.
authors.forename: Shouxin
authors.initials: S
authors.lastname: Liu
authors.affiliation: Key laboratory of Bio-based Material Science and Technology, Ministry of Education, Northeast Forestry University, Harbin, 150040, P. R. China.
authors.forename: Yixing
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Key laboratory of Bio-based Material Science and Technology, Ministry of Education, Northeast Forestry University, Harbin, 150040, P. R. China.
authors.forename: Jian
authors.initials: J
authors.lastname: Li
authors.affiliation: Key laboratory of Bio-based Material Science and Technology, Ministry of Education, Northeast Forestry University, Harbin, 150040, P. R. China.
authors.forename: Haipeng
authors.initials: H
authors.lastname: Yu
mesh_terms: D018533:Biomass; D001704:Biopolymers / Q000737:chemistry*; D002241:Carbohydrates / Q000737:chemistry*; D006868:Hydrolysis; D008031:Lignin / Q000737:chemistry*; D008872:Microwaves; D012997:Solvents / Q000737:chemistry*; D014934:Wood / Q000737:chemistry*
chemical_list: D001704:Biopolymers; D002241:Carbohydrates; D012997:Solvents; D008031:Lignin
keywords: biomass; deep eutectic solvents; lignin; lignin-carbohydrate complexes; microwave chemistry