Comparison of Lignin Fractions Isolated from Wheat Straw Using Alkaline and Acidic Deep Eutectic Solvents

Xin Yue; Terhi Suopajärvi; Otto Mankinen; Marja Mikola; Atte Mikkelson; Juha Ahola; Sami Hiltunen; Sanna Komulainen; Anu M Kantola; Ville-Veikko Telkki; Henrikki Liimatainen

doi:10.1021/acs.jafc.0c04981

Comparison of Lignin Fractions Isolated from Wheat Straw Using Alkaline and Acidic Deep Eutectic Solvents

Xin Yue
, Terhi Suopajärvi
, Otto Mankinen
, Marja Mikola
, Atte Mikkelson
, Juha Ahola
, Sami Hiltunen
, Sanna Komulainen
, Anu M Kantola
, Ville-Veikko Telkki
, Henrikki Liimatainen^*

^*Corresponding author for this work

BA5404 Lignin and sidestream valorization

Oulu University Hospital

Research output: Contribution to journal › Article › Scientific › peer-review

68 Citations (Scopus)

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.

Original language	English
Pages (from-to)	15074-15084
Journal	Journal of Agricultural and Food Chemistry
Volume	68
Issue number	51
DOIs	https://doi.org/10.1021/acs.jafc.0c04981
Publication status	Published - 23 Dec 2020
MoE publication type	A1 Journal article-refereed

Funding

The authors acknowledge the financial support of the ERANet-LAC and Academy of Finland, project Towards a novel and sustainable biorefinery concept based on green technologies for main commercial grain crop residues (BIOCODE) (no. 311974). The facilities of the Center of Microscopy and Nanotechnology of the University of Oulu were utilized in this research. X.Y. thanks the China Scholarship Council (CSC) for the financial support. V.-V.T. thanks the Academy of Finland (grant numbers 289649, 294027, and 319216) and the Kvantum institute (University of Oulu) for the financial support.

Keywords

wheat straw
alkaline and acidic DESs
lignin
morphological characteristics
structural features

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10.1021/acs.jafc.0c04981

Cite this

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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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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Yue, X, Suopajärvi, T, Mankinen, O, Mikola, M, Mikkelson, A, Ahola, J, Hiltunen, S, Komulainen, S, Kantola, AM, 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, vol. 68, no. 51, pp. 15074-15084. https://doi.org/10.1021/acs.jafc.0c04981

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T1 - Comparison of Lignin Fractions Isolated from Wheat Straw Using Alkaline and Acidic Deep Eutectic Solvents

AU - Yue, Xin

AU - Suopajärvi, Terhi

AU - Mankinen, Otto

AU - Mikola, Marja

AU - Mikkelson, Atte

AU - Ahola, Juha

AU - Hiltunen, Sami

AU - Komulainen, Sanna

AU - Kantola, Anu M

AU - Telkki, Ville-Veikko

AU - Liimatainen, Henrikki

PY - 2020/12/23

Y1 - 2020/12/23

N2 - 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.

AB - 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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KW - morphological characteristics

KW - structural features

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Comparison of Lignin Fractions Isolated from Wheat Straw Using Alkaline and Acidic Deep Eutectic Solvents

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Keywords

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