Preacetylation of Kraft Lignin Facilitates Acid-Catalyzed Depolymerization in Acidic Deep Eutectic Solvents to Obtain Lignin Oil With High Antioxidant Activity.

Wenguang Li, Penghui Li, Shubin Wu, Xiaohui Wang

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Article in ChemSusChem, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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4 authors.

Wenguang LiState Key Laboratory of Advanced Papermaking and Paper-based Materials, South China University of Technology, Guangzhou, P. R. China.ORCID https://orcid.org/0000-0002-5969-206X

Penghui LiState Key Laboratory of Advanced Papermaking and Paper-based Materials, South China University of Technology, Guangzhou, P. R. China.

Shubin WuState Key Laboratory of Advanced Papermaking and Paper-based Materials, South China University of Technology, Guangzhou, P. R. China.ORCID https://orcid.org/0000-0002-3054-8152

Xiaohui WangState Key Laboratory of Advanced Papermaking and Paper-based Materials, South China University of Technology, Guangzhou, P. R. China.ORCID https://orcid.org/0000-0002-3769-2325

Funding

Guangdong Basic and Applied Basic Research Foundation 2024A1515011941National Natural Science Foundation of China 32271807

6 · The paper itself

Abstract

Kraft lignin, an abundant renewable aromatic polymer, has attracted increasing interest for acid-catalyzed depolymerization to obtain lignin oil with high antioxidant activity. However, this process is plagued by severe condensation of reactive intermediates, leading to low lignin oil yields. To address this critical issue, we performed preacetylation modification on hardwood kraft lignin (HKL) and investigated its depolymerization behavior in acidic deep eutectic solvents (DESs). Furthermore, the underlying mechanism by which acetylation promotes depolymerization was clarified using lignin monomer model compounds. The results demonstrated that acetylation effectively increased the lignin oil yield. Specifically, at a degree of substitution (DS) of 66.57% (AHKL-20), the lignin oil yield increased markedly from 37.80% to 55.98%. Additionally, lignin oil derived from AHKL-20 (lignin oil

Indexed as

acetylation modificationCα–OH groupsdeep eutectic solventsdepolymerizationkraft lignin

Identifiers

PMID42612011

DOI10.1002/cssc.70987

PMCPMC13484998

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