University of Oulu

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

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

Saved in:
Author: Yue, Xin1; Suopajärvi, Terhi1; Mankinen, Otto2,3;
Organizations: 1Fiber and Particle Engineering Research Unit, University of Oulu, P.O. Box 4300, 90014 Oulu, Finland
2NMR Research Unit, University of Oulu, P.O. Box 4300, 90014 Oulu, Finland
3Oulu Functional NeuroImaging Group, Research Unit of Medical Imaging, Physics and Technology, Medical Research Center Oulu, University of Oulu and Oulu University Hospital, P.O. Box 50, 90029 Oulu, Finland
4Chemical Process Engineering Research Unit, University of Oulu, P.O. Box 4300, 90014 Oulu, Finland
5VTT Technical Research Centre of Finland, Vuorimiehentie 3, 02150 Espoo, Finland
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe202102023509
Language: English
Published: American Chemical Society, 2020
Publish Date: 2021-12-08
Description:

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.

see all

Series: Journal of agricultural and food chemistry
ISSN: 0021-8561
ISSN-E: 1520-5118
ISSN-L: 0021-8561
Volume: 68
Issue: 51
Pages: 15074 - 15084
DOI: 10.1021/acs.jafc.0c04981
OADOI: https://oadoi.org/10.1021/acs.jafc.0c04981
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
116 Chemical sciences
215 Chemical engineering
Subjects:
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.
Academy of Finland Grant Number: 289649
294027
319216
311974
Detailed Information: 289649 (Academy of Finland Funding decision)
294027 (Academy of Finland Funding decision)
319216 (Academy of Finland Funding decision)
311974 (Academy of Finland Funding decision)
Copyright information: 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.