Formation and Identification of Lignin-Carbohydrate Complexes in Pre-hydrolysis Liquors

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Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2023-06-12
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Language
en
Pages
8
2541-2548
Series
Biomacromolecules, Volume 24, issue 6
Abstract
The lignin-carbohydrate complexes (LCCs) typically present in the liquors produced in the pre-hydrolysis of biomass cause severe difficulties in downstream fractionation. To address this issue, a series of LCC samples were accessed from solutions obtained from the pre-hydrolysis of extractive-free pine wood meal (H-LCC) and compared with LCC obtained from the corresponding residues (B-LCC). Chromatographic and spectroscopic techniques revealed that 8.2% of the lignins were degraded at 160 °C, resulting from the breakage of β-O-4′ linkages during pre-hydrolysis. Meanwhile, (reactive) hemicelluloses were mainly removed from the fibers' cell walls. Some hemicelluloses in the pre-hydrolysis liquor, such as glucomannans, were associated with degraded lignin fragments via ether and ester bonds. However, the newly formed LCCs were pH-labile and underwent rapid hydrolysis. Overall, we reveal details about LCC formation and degradation during pre-hydrolysis at given temperatures, critically important in efforts to improve biomass processing and valorization.
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Funding Information: This work was supported by the National Natural Science Foundation of China (nos. 21908048, 32001705, and 32071722), the China Scholarship Council (nos. 201908420037 and 201908420032), the Canada Excellence Research Chair Program (CERC-2018-00006), and the Canada Foundation for Innovation (project number 38623). Publisher Copyright: © 2023 The Authors. Published by American Chemical Society.
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Feng, N, She, S, Tang, F, Zhao, X, Chen, J, Wang, P, Wu, Q & Rojas, O J 2023, ' Formation and Identification of Lignin-Carbohydrate Complexes in Pre-hydrolysis Liquors ', Biomacromolecules, vol. 24, no. 6, pp. 2541-2548 . https://doi.org/10.1021/acs.biomac.3c00053