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Lewis Acid-Facilitated Deep Eutectic Solvent (DES) Pretreatment for Producing High-Purity and Antioxidative Lignin
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2019-12-31 , DOI: 10.1021/acssuschemeng.9b05846
Zhi-Kun Wang 1 , Si Hong 2 , Jia-long Wen 2 , Cheng-Ye Ma 2 , Lv Tang 1 , Hao Jiang 1 , Jun-Jie Chen 1 , Sha Li 1 , Xiao-Jun Shen 1, 3, 4 , Tong-Qi Yuan 2
Affiliation  

Due to its low cost and green nature, pretreatment of lignocelluloses using deep eutectic solvents (DESs) is a promising approach for dissociation of lignocelluloses and extraction of lignin. However, pureChCl/glycerol DES has been found to be ineffective for this purpose. In this work, we develop a strategy of introducing Lewis acids (AlCl3, FeCl3, FeCl2, ZnCl2, and CuCl2) into ChCl/glycerol for efficient pretreatment of hybrid Pennisetum energy grass in order to produce high-purity and antioxidative lignin. Furthermore, the structural characteristics of the regenerated lignin isolated using the DES pretreatment were comprehensively investigated. The results revealed that the FeCl3-catalyzed DES pretreatment facilitated fractionation of the regenerated lignin. It was observed that the amount of ether linkages in the regenerated lignin decreased gradually with increasing pretreatment severity. Furthermore, it was found that the amount of phenolic hydroxyl groups in the regenerated lignin was sharply increased. The regenerated lignin isolated after the DES pretreatment showed excellent antioxidant activity. It is concluded that a deep understanding of the fundamental chemistry of lignin during the Lewis acid-catalyzed DES pretreatment will be beneficial for the optimization of the pretreatment process.

中文翻译:

路易斯酸促进的深共晶溶剂(DES)预处理,可生产高纯度和抗氧化的木质素

由于其成本低廉和绿色环保,使用深共熔溶剂(DES)预处理木质纤维素是一种有希望的解离木质纤维素和提取木质素的方法。然而,已经发现纯ChCl /甘油DES对于该目的是无效的。在这项工作中,我们制定了一种将路易斯酸(AlCl 3,FeCl 3,FeCl 2,ZnCl 2和CuCl 2)引入到ChCl /甘油中的策略,以对杂交狼尾草能量草进行高效预处理,从而产生高纯度和抗氧化性。木质素。此外,还对使用DES预处理分离出的再生木质素的结构特征进行了全面研究。结果表明,FeCl3-催化的DES预处理促进了再生木质素的分级分离。观察到,随着预处理强度的增加,再生木质素中醚键的数量逐渐减少。此外,发现再生的木质素中酚羟基的数量急剧增加。DES预处理后分离出的再生木质素具有出色的抗氧化活性。结论是,对路易斯酸催化的DES预处理过程中木质素基本化学的深入了解将有助于优化预处理过程。
更新日期:2019-12-31
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