A novel aqueous gallic acid-based natural deep eutectic solvent for delignification of hybrid poplar and enhanced enzymatic hydrolysis of treated pulp

Natural deep eutectic solvent (NADES) emerged as a promising solvent used for lignocellulosic biomass dissolution and lignin separation. In this work, we prepared an aqueous NADES from choline chloride and a type of aromatic hydrogen bond donor, gallic acid-monohydrate, according to the possible sol...

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Published inCellulose (London) Vol. 27; no. 14; pp. 8301 - 8315
Main Authors Song, Yanliang, Shi, Xiaoyou, Ma, Sen, Yang, Xue, Zhang, Xu
Format Journal Article
LanguageEnglish
Published Dordrecht Springer Netherlands 01.09.2020
Springer Nature B.V
Subjects
Acids
Aromatic compounds
Bioorganic Chemistry
Ceramics
Chemistry
Chemistry and Materials Science
Choline
Composites
Gallic acid
Glass
Hydrogen bonds
Hydrolysis
Hydrophobicity
Hydroxyl groups
Lignin
Lignocellulose
Mass transfer
Natural Materials
Organic Chemistry
Original Research
Physical Chemistry
Polymer Sciences
Poplar
Solvents
Sustainable Development
Natural deep eutectic solvent
Delignification
Gallic acid
Lignocellulosic biomass
Enzymatic hydrolysis
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Summary:Natural deep eutectic solvent (NADES) emerged as a promising solvent used for lignocellulosic biomass dissolution and lignin separation. In this work, we prepared an aqueous NADES from choline chloride and a type of aromatic hydrogen bond donor, gallic acid-monohydrate, according to the possible solute-solvent interactions where phenyl-based NADES possessed favorite interactions with lignin aromatic compounds. Aqueous gallic acid-based NADES induced a high lignin removal (50.0%) of poplar and enhancement of enzymatic hydrolysis yield of treated pulp (69.1%). Presence of water aided in decreasing NADES viscosity and improving mass transfer. Various characterization approaches of extracted lignin were employed to investigate changes of molecular weights, types and amounts of hydroxyl groups and crucial linkages. The aqueous gallic acid-based NADES exploited in this work exhibited desirable delignification performance. Formation of considerable hydrogen bonds and hydrophobic interactions between the aromatic gallic acid-based NADES and lignin contributed to the reduced re-aggregation and condensation of separated lignin fragments.
ISSN:0969-0239
1572-882X
DOI:10.1007/s10570-020-03342-z