TY - JOUR
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
N1 - Funding Information:
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.
Publisher Copyright:
©
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
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.
KW - wheat straw
KW - alkaline and acidic DESs
KW - lignin
KW - morphological characteristics
KW - structural features
UR - http://www.scopus.com/inward/record.url?scp=85097873295&partnerID=8YFLogxK
U2 - 10.1021/acs.jafc.0c04981
DO - 10.1021/acs.jafc.0c04981
M3 - Article
C2 - 33290067
SN - 0021-8561
VL - 68
SP - 15074
EP - 15084
JO - Journal of Agricultural and Food Chemistry
JF - Journal of Agricultural and Food Chemistry
IS - 51
ER -