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Regeneration behavior of chitosan from ionic liquid using water and alcohols as anti-solvents

Lookup NU author(s): Professor David XieORCiD

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).


Abstract

While ionic liquids (ILs) have been considered as effective and “green” solvents for biopolymer processing, regeneration of IL-dissolved biopolymers could largely impact biopolymer structure and properties. This study indicates that the reconstitution of chitosan structure during regeneration from 1-ethyl-3-methylimidazolium acetate ([Emim][OAc]) depends on anti-solvent (water, methanol or ethanol) largely. Irrespective of anti-solvent, the chitosan chemical structure was not varied by dissolution or regeneration. With water, the regenerated chitosan had the highest crystallinity index of 54.18%, followed by those with methanol (35.07%) and ethanol (25.65%). Water as an anti-solvent could promote chitosan chain rearrangement, leading to the formation of an ordered aggregated structure and crystallites. Density functional theory (DFT) simulation indicates that the number of hydrogen bonds formed between anti-solvents and [Emim][OAc] was in the order of water > methanol > ethanol. With water used for regeneration, the aggregation and rearrangement of chitosan chains occurred more easily.


Publication metadata

Author(s): Tan X, Wang G, Zhong L, Xie F, Lan P, Chi B

Publication type: Article

Publication status: Published

Journal: International Journal of Biological Macromolecules

Year: 2021

Volume: 166

Pages: 940-947

Print publication date: 01/01/2021

Online publication date: 02/11/2020

Acceptance date: 30/10/2020

Date deposited: 23/05/2023

ISSN (print): 0141-8130

ISSN (electronic): 1879-0003

Publisher: Elsevier

URL: https://doi.org/10.1016/j.ijbiomac.2020.10.251

DOI: 10.1016/j.ijbiomac.2020.10.251


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