Deep eutectic solvent-facilitated demethylation and depolymerization for producing highly reactive and antioxidative lignin

文献类型： 外文期刊

第一作者： Chen, Ling

作者： Chen, Ling;Liang, Mengdi;Qu, Ping;Sun, Enhui;Yong, Cheng;Jin, Hongmei;Huang, Hongying;Chen, Ling;Qu, Ping;Sun, Enhui;Yong, Cheng;Jin, Hongmei;Huang, Hongying;Liang, Mengdi

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关键词： Lignin demethylation; Lignin depolymerization; Acidic deep eutectic solvent

期刊名称：INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES （ 影响因子：8.5； 五年影响因子：8.7 ）

ISSN： 0141-8130

年卷期： 2025 年 321 卷

页码：

收录情况： SCI

摘要： Demethylation is a promising way for lignin valorization but is still challenging due to its reliance on hazardous solvents, super-stoichiometric halogenated reagents, and harsh reaction conditions. This study developed a facile and efficient strategy for lignin demethylation and depolymerization using a sustainable acidic deep eutectic solvent (DES) coupled with a remarkably reduced hydrobromic acid (HBr) loading (4.7 wt%). Structural characterizations revealed that the DES composed of choline chloride (ChCl) and lactic acid (LA) significantly promoted beta-O-4 ether bond cleavage and demethylation process, achieving a dramatic efficiency enhancement from 1 % to 45 % compared to the conventional HBr/N,N-dimethylformamide system. The resulting lignin exhibited substantially reduced molecular weight and syringyl/guaiacyl (S/G) ratio, as well as a 76 % increase in phenolic hydroxyl content (from 2.76 mmol g- 1 to 4.87 mmol g- 1). Notably, the demethylated lignin demonstrated superior antioxidant activity compared to the original lignin and the commercial antioxidant 3,5-di-tert-butyl-4hydroxytoluene, BHT. Preliminary application studies confirmed its effectiveness as a multifunctional additive in protein-based composites, simultaneously enhancing the tensile strength, toughness, and water resistance of the composite films. This work highlights the synergistic combination of green DES mediation and low-concentration catalytic systems for lignin demethylation, establishing an efficient strategy for sustainable lignin valorization.

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