Lu Chaobo, Xu Jun, Xie Junxian, Zhu Shiyun, Wang Bin, Li Jun, Zhang Fengshan, Chen Kefu
Plant Fiber Materials Science Research Center, State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China; Guangdong Provincial Key Laboratory of Plant Resources Biorefinery, Guangzhou 510006, China.
Plant Fiber Materials Science Research Center, State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China; Guangdong Provincial Key Laboratory of Plant Resources Biorefinery, Guangzhou 510006, China; Shandong Sun Paper Industry Joint Stock, Jining 272100, China.
Int J Biol Macromol. 2022 Dec 1;222(Pt B):2512-2522. doi: 10.1016/j.ijbiomac.2022.10.035. Epub 2022 Oct 12.
The industrial lignin has shown great potential to replace some of petrochemical. But the deep color of lignin limits their application in high-value field. The extraction of light-colored lignin from lignocellulose still remains challenging. Here, we reported a strategy for rapid extraction of lignin from corn stover by using a new ternary deep eutectic solvent (TDES) composed of choline chloride (ChCl), formic acid (FA) and maleic acid (MA). The color feature and structural characterization of obtained lignin was comprehensively elucidated. The results revealed that the lignin streams had light color (brightness ISO 23.44 %) with a high yield (76.3 %), purity (93.5 %), low molecular weight (Mw 1544-2040 g/mol), and low polydispersity (PDI ≤ 1.76). The introduction of MA could reduce the destruction of lignin substructure during the treatment process and avoid the deepening of lignin color. Quantitative analysis of conjugated carbonyl and quinone carbonyl and semi-quantitative analysis of lignin by 2D NMR showed that temperature had a great influence on its structure.
工业木质素已显示出替代某些石化产品的巨大潜力。但木质素的深色限制了其在高价值领域的应用。从木质纤维素中提取浅色木质素仍然具有挑战性。在此，我们报道了一种使用由氯化胆碱（ChCl）、甲酸（FA）和马来酸（MA）组成的新型三元低共熔溶剂（TDES）从玉米秸秆中快速提取木质素的策略。对所得木质素的颜色特征和结构表征进行了全面阐释。结果表明，木质素流颜色浅（亮度ISO 23.44%），产率高（76.3%），纯度高（93.5%），分子量低（Mw 1544 - 2040 g/mol），多分散性低（PDI≤1.76）。MA的引入可减少处理过程中木质素亚结构的破坏，并避免木质素颜色加深。通过二维核磁共振对共轭羰基和醌羰基进行定量分析以及对木质素进行半定量分析表明，温度对其结构有很大影响。
