Comparison of lignin fractions isolated from wheat straw using alkaline and acidic deep eutectic solvents

Yue, Xin; Suopajärvi, Terhi; Mankinen, Otto; Mikola, Marja; Mikkelson, Atte; Ahola, Juha; Hiltunen, Sami; Komulainen, Sanna; Kantola, Anu M.; Telkki, Ville-Veikko; Liimatainen, Henrikki (2020-12-08)
 
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https://doi.org/10.1021/acs.jafc.0c04981

Yue, Xin
Suopajärvi, Terhi
Mankinen, Otto
Mikola, Marja
Mikkelson, Atte
Ahola, Juha
Hiltunen, Sami
Komulainen, Sanna
Kantola, Anu M.
Telkki, Ville-Veikko
Liimatainen, Henrikki
American Chemical Society
08.12.2020

Yue, X., Suopajärvi, T., Mankinen, O., Mikola, M., Mikkelson, A., Ahola, J., Hiltunen, S., Komulainen, S., Kantola, A. M., Telkki, V.-V., & Liimatainen, H. (2020). Comparison of Lignin Fractions Isolated from Wheat Straw Using Alkaline and Acidic Deep Eutectic Solvents. Journal of Agricultural and Food Chemistry, 68(51), 15074–15084. https://doi.org/10.1021/acs.jafc.0c04981

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This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Agricultural and Food Chemistry, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.jafc.0c04981.
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doi:https://doi.org/10.1021/acs.jafc.0c04981
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https://urn.fi/URN:NBN:fi-fe202102023509
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Abstract

This study aims to examine the characteristics of two solid lignin fractions isolated from wheat straw using alkaline and acidic deep eutectic solvents (DESs). The chemical properties and morphological characteristics of the two lignin fractions were evaluated by measuring their purity, elemental composition, molecular weight and particle size distributions, and microstructure. Their chemical structure was evaluated using DRIFT (diffuse reflectance infrared Fourier transform) spectroscopy, GPC (gel permeation chromatography), TGA (thermogravimetric analysis), ¹³C NMR (nuclear magnetic resonance), ³¹P NMR, and HSQC NMR. Our findings showed that the lignin isolated using alkaline DESs was less pure and had a smaller particle size, higher molecular weight, and thermal stability compared to the lignin isolated using acidic DESs. Their lignin structure was also determined to be different due to varying selective fractures on the linkages of lignin. These results suggest that the DES treatments could selectively extract lignin from wheat straw with different yields, compositions, morphologies, and structures, which could then provide a theoretical basis for the selection of DESs for specially appointed lignin extraction.

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