TY - JOUR
T1 - High-purity lignin fractions and nanospheres rich in phenolic hydroxyl and carboxyl groups isolated with alkaline deep eutectic solvent from wheat straw
AU - Yue, Xin
AU - Suopajärvi, Terhi
AU - Sun, Shirong
AU - Mankinen, Otto
AU - Mikkelson, Atte
AU - Huttunen, Harri
AU - Komulainen, Sanna
AU - Romakkaniemi, Idamaria
AU - Ahola, Juha
AU - Telkki, Ville Veikko
AU - Liimatainen, Henrikki
N1 - Funding Information:
The financial support of China Scholarship Council (CSC), the Regional Council of Kainuu, the funding granted by the European Regional Development Fund of the European Union for TELI project, and Tauno Tönning Foundation grants are gratefully acknowledged. We also would like to thank the support of Center of Microscopy and Nanotechnology in the University of Oulu and Jasmiini Tornberg for revising the experimental procedure diagram.
Funding Information:
The financial support of China Scholarship Council (CSC), the Regional Council of Kainuu, the funding granted by the European Regional Development Fund of the European Union for TELI project, and Tauno Tönning Foundation grants are gratefully acknowledged. We also would like to thank the support of Center of Microscopy and Nanotechnology in the University of Oulu and Jasmiini Tornberg for revising the experimental procedure diagram.
Publisher Copyright:
© 2022 The Author(s)
PY - 2022/9
Y1 - 2022/9
N2 - A combined pretreatment based on alkaline deep eutectic solvent (DES) of K2CO3 and glycerol and sequential acid fractionation was developed to extract reactive lignin from wheat straw biomass. This process exhibited excellent purification performance in lignin isolation, and the lignin fractionated at low pH displayed high reactivity, having hydroxyl and carboxyl groups up to 9.60 and 2.52 mmol/g, respectively. Silica was selectively separated and removed during the precipitation stage, avoiding the “silica interference”. Moreover, DES-lignin nanospheres created by self-assembly using lignin fractions obtained by acid precipitation possessed a high zeta potential, large particle size and high content of hydrophilic groups. Overall, the findings related to the dissociation mechanism and fractionation of reactive lignin during alkaline DES pretreatment and the acid sequence precipitation are crucial for facilitating lignin valorization in high-added value products.
AB - A combined pretreatment based on alkaline deep eutectic solvent (DES) of K2CO3 and glycerol and sequential acid fractionation was developed to extract reactive lignin from wheat straw biomass. This process exhibited excellent purification performance in lignin isolation, and the lignin fractionated at low pH displayed high reactivity, having hydroxyl and carboxyl groups up to 9.60 and 2.52 mmol/g, respectively. Silica was selectively separated and removed during the precipitation stage, avoiding the “silica interference”. Moreover, DES-lignin nanospheres created by self-assembly using lignin fractions obtained by acid precipitation possessed a high zeta potential, large particle size and high content of hydrophilic groups. Overall, the findings related to the dissociation mechanism and fractionation of reactive lignin during alkaline DES pretreatment and the acid sequence precipitation are crucial for facilitating lignin valorization in high-added value products.
KW - Alkaline deep eutectic solvent
KW - High-purity lignin
KW - Phenolic hydroxyl
KW - Sequential acid fractionation
KW - Wheat straw
UR - http://www.scopus.com/inward/record.url?scp=85133666416&partnerID=8YFLogxK
U2 - 10.1016/j.biortech.2022.127570
DO - 10.1016/j.biortech.2022.127570
M3 - Article
C2 - 35788393
AN - SCOPUS:85133666416
SN - 0960-8524
VL - 360
JO - Bioresource Technology
JF - Bioresource Technology
M1 - 127570
ER -