Advanced NMR Characterization of Aquasolv Omni (AqSO) Biorefinery Lignins/Lignin-Carbohydrate Complexes
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2023-09-22
Department
Department of Bioproducts and Biosystems
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Mcode
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Language
en
Pages
12
Series
ChemSusChem, Volume 16, issue 18
Abstract
Our recently reported AquaSolv Omni (AqSO) process shows great potential as a parameter-controlled type of biorefinery, which allows tuning of structure and properties of the products towards their optimal use in high-value applications. Herein, a comprehensive NMR (quantitative 13C, 31P, and 2D heteronuclear single-quantum coherence) structural characterization of AqSO lignins is reported. The effect of the process severity (P-factor) and liquid-to-solid ratio (L/S) on the structure of the extracted lignins has been investigated and discussed. Low severity (P-factor in the range 400–600) and L/S=1 led to the isolation of less degraded lignin with a higher β-O-4 content up to 34/100 Ar. Harsher processing conditions (P-factor=1000–2500) yielded more condensed lignins with a high degree of condensation up to 66 at P-factor=2000. New types of lignin moieties, such as alkyl-aryl and alkyl-alkyl chemical bonds together with novel furan oxygenated structures have been identified and quantified for the first time. In addition, the formation of lignin carbohydrate complexes bonds has been hypothesized at low severity and L/S. Based on the obtained data we were able to formulate a possible outlook of the occurring reactions during the hydrothermal treatment. Overall, such detailed structural information bridges the gap from process engineering to sustainable product development.Description
Publisher Copyright: © 2023 The Authors. ChemSusChem published by Wiley-VCH GmbH.
Keywords
integrated biorefinery, lignin, lignin-carbohydrate complexes, NMR spectroscopy, reaction mechanisms
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Citation
Schlee, P, Tarasov, D, Rigo, D & Balakshin, M 2023, ' Advanced NMR Characterization of Aquasolv Omni (AqSO) Biorefinery Lignins/Lignin-Carbohydrate Complexes ', ChemSusChem, vol. 16, no. 18, e202300549 . https://doi.org/10.1002/cssc.202300549