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Yue, X., Suopajärvi, T., Sun, S., Mankinen, O., Mikkelson, A., Huttunen, H., Komulainen, S., Romakkaniemi, I., Ahola, J., Telkki, V.-V., & Liimatainen, H. (2022). High-purity lignin fractions and nanospheres rich in phenolic hydroxyl and carboxyl groups isolated with alkaline deep eutectic solvent from wheat straw. Bioresource Technology, 360, 127570. https://doi.org/10.1016/j.biortech.2022.127570

High-purity lignin fractions and nanospheres rich in phenolic hydroxyl and carboxyl groups isolated with alkaline deep eutectic solvent from wheat straw

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Author: Yue, Xin1; Suopajärvi, Terhi1; Sun, Shirong2;
Organizations: 1Fiber and Particle Engineering Research Unit, University of Oulu, P.O. Box 4300, 90014 Oulu, Finland
2School of Chemical Engineering and Light Industry, Guangdong University of Technology, 510006 Guangdong, China
3NMR Research Unit, University of Oulu, P.O. Box 4300, 90014 Oulu, Finland
4Department of Diagnostic Radiology, Oulu University Hospital, 90014 Oulu, Finland
5VTT Technical Research Centre of Finland, Vuorimiehentie 3, 02150 Espoo, Finland
6Unit of Measurement Technology MITY, Teknologiapuisto PL 127, 87400 Oulu, Finland
7Chemical Process Engineering Research Unit, University of Oulu, P.O. Box 4300, 90014 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 5.1 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2022102463073
Language: English
Published: Elsevier, 2022
Publish Date: 2022-10-24
Description:

Abstract

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.

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Series: Bioresource technology
ISSN: 0960-8524
ISSN-E: 1873-2976
ISSN-L: 0960-8524
Volume: 360
Article number: 127570
DOI: 10.1016/j.biortech.2022.127570
OADOI: https://oadoi.org/10.1016/j.biortech.2022.127570
Type of Publication: A1 Journal article – refereed
Field of Science: 220 Industrial biotechnology
Subjects:
Alkaline deep eutectic solvent
High-purity lignin
Phenolic hydroxyl
Sequential acid fractionation
Wheat straw
Article
Funding: 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.
Copyright information: © 2022 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
  https://creativecommons.org/licenses/by/4.0/