Pretreatment of Wheat Straw Lignocelluloses by Deep Eutectic Solvent for Lignin Extraction

Hongzhi Ma; Penglu Fu; Jihua Zhao; Xingxing Lin; Wenyu Wu; Ziqiang Yu; Changlei Xia; Qunhui Wang; Ming Gao; Jun Zhou

doi:10.3390/molecules27227955

Molecules (Nov 2022)

Pretreatment of Wheat Straw Lignocelluloses by Deep Eutectic Solvent for Lignin Extraction

Hongzhi Ma,
Penglu Fu,
Jihua Zhao,
Xingxing Lin,
Wenyu Wu,
Ziqiang Yu,
Changlei Xia,
Qunhui Wang,
Ming Gao,
Jun Zhou

Affiliations

Hongzhi Ma: Department of Environmental Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Penglu Fu: Department of Environmental Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Jihua Zhao: Department of Environmental Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Xingxing Lin: Department of Environmental Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Wenyu Wu: Department of Environmental Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Ziqiang Yu: Department of Environmental Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Changlei Xia: Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China
Qunhui Wang: Department of Environmental Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Ming Gao: Department of Environmental Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Jun Zhou: College of Management Academician Workstation, Changsha Medical University, Changsha 410219, China

DOI: https://doi.org/10.3390/molecules27227955
Journal volume & issue: Vol. 27, no. 22
p. 7955

Abstract

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In order to increase the fractionation efficiency of the wheat straw, a deep eutectic solvent (DES) system consisting of chlorine/lactic acid was used in this study for wheat straw pretreatment. The outcomes exhibited that DES pretreatment significantly enhanced the capability to extract lignin, retain cellulose, and remove hemicellulose. The best condition for the pretreatment of wheat straw was 150 °C for 6 h. The process retained most cellulose in the pretreated biomass (49.94–73.60%), and the enzymatic digestibility of the pretreatment residue reached 89.98%. Further characterization of lignin showed that the high yield (81.54%) and the high purity (91.33%) resulted from the ether bond cleavage in lignin and the connection between hemicellulose and lignin. As for application, the enzymatic hydrolysis of the best condition reached 89.98%, and the lignin also had suitable stability. The investigation exhibited that DES pretreatment has the potential to realize an efficient fractionation of lignocellulosic biomass into high-applicability cellulose and lignin of high-quality.

Published in Molecules

ISSN: 1420-3049 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Science: Chemistry: Organic chemistry
Website: http://www.mdpi.com/journal/molecules

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