Journal
ACS OMEGA
Volume 4, Issue 22, Pages 19829-19839Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.9b02709
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Funding
- Project of Pearl River S&T Nova Program of Guangzhou [201710010096]
- National Natural Science Foundation of China [21978053, 51508547]
- Science and Technology Planning Project of Guangdong Province, China [2017A010103043, 2016A010104009]
- One-Hundred Young Talents Program of Guangdong University of Technology [220413185]
- National Training Programs of Innovation and Entrepreneurship for Undergraduates [201811845015, 201911845088X, xj201811845083, xj201911845179, xj201811845070, xj201911845173, xj201911845174]
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Efficient and feasible pretreatment of lignocellulosic biomass waste is an important prerequisite step to promote subsequent enzymatic hydrolysis and enhance the economics of biofuels production. This study focuses on the pretreatment of wheat straw (WS) with triethylbenzyl ammonium chloride/lactic acid (TEBAC/LA)-based deep eutectic solvents to enhance biomass fractionation and lignin extraction. Effects of pretreatment time, temperature, and TEBAC/LA molar ratio on pretreatment were evaluated systematically. Results suggested that 89.06 +/- 1.05% of cellulose and 71.00 +/- 1.03% of xylan were hydrolyzed with enzyme loadings of 35 FPU cellulase and 82 CBU beta-glucosidase (per gram of dry biomass) after pretreatment by TEBAC/LA (1:9) at 373 K for 10 h. A total monosaccharide yield of 0.550 g/g WS (91.27% of the theoretical yield) was achieved with 79.73 +/- 0.93% of lignin removal. Furthermore, the H-1-C-13 two-dimensional heteronuclear single quantum correlation (2D-HSQC) NMR spectroscopy showed that the regenerated lignin (75.69 +/- 1.32% purity) was mainly composed of the syringyl units and the guaiacyl units. Overall, the results in this study provide an effective and facile pretreatment method for lignocellulosic biomass waste to enhance enzymatic hydrolysis saccharification.
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