Department of Environmental Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, Beijing 100083, China.
Molecules. 2022 Nov 17;27(22):7955. doi: 10.3390/molecules27227955.
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.
为提高麦草的分馏效率，本研究采用由氯/乳酸组成的深共熔溶剂（DES）体系对麦草进行预处理。结果表明，DES 预处理显著提高了提取木质素、保留纤维素和去除半纤维素的能力。麦草预处理的最佳条件为 150°C、6 h。该工艺在预处理生物质中保留了大部分纤维素（49.94-73.60%），预处理残渣的酶解率达到 89.98%。进一步对木质素进行表征发现，木质素中醚键的断裂以及半纤维素与木质素之间的连接导致木质素得率高（81.54%）、纯度高（91.33%）。就应用而言，最佳条件下的酶解率达到 89.98%，木质素也具有适宜的稳定性。研究表明，DES 预处理有可能实现木质纤维素生物质的高效分馏，得到高应用性能的纤维素和高质量的木质素。
