High-purity lignin fractions and nanospheres rich in phenolic hydroxyl and carboxyl groups isolated with alkaline deep eutectic solvent from wheat straw
Year of publication
2022
Authors
Yue, Xin; Suopajärvi, Terhi; Sun, Shirong; Mankinen, Otto; Mikkelson, Atte; Huttunen, Harri; Komulainen, Sanna; Romakkaniemi, Idamaria; Ahola, Juha; Telkki, Ville-Veikko; Liimatainen, Henrikki
Abstract
<p>A combined pretreatment based on alkaline deep eutectic solvent (DES) of K<sub>2</sub>CO<sub>3</sub> 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.</p>
Show moreOrganizations and authors
VTT Technical Research Centre of Finland Ltd
Mikkelson Atte
Publication type
Publication format
Article
Parent publication type
Journal
Article type
Original article
Audience
ScientificPeer-reviewed
Peer-ReviewedMINEDU's publication type classification code
A1 Journal article (refereed), original researchPublication channel information
Journal
Volume
360
Article number
127570
ISSN
Publication forum
Publication forum level
2
Open access
Open access in the publisher’s service
Yes
Open access of publication channel
Partially open publication channel
License of the publisher’s version
CC BY
Self-archived
Yes
License of the self-archived publication
CC BY
Other information
Fields of science
Environmental engineering; Environmental biotechnology; Industrial biotechnology
Keywords
[object Object],[object Object],[object Object],[object Object],[object Object]
Internationality of the publisher
International
Language
English
International co-publication
Yes
Co-publication with a company
No
DOI
10.1016/j.biortech.2022.127570
The publication is included in the Ministry of Education and Culture’s Publication data collection
Yes