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Regeneration behavior of chitosan from ionic liquid using water and alcohols as anti-solvents
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Tan, Xiaoyan, Wang, Guowei, Zhong, Lei, Xie, Fengwei, Lan, Ping and Chi, Bo (2021) Regeneration behavior of chitosan from ionic liquid using water and alcohols as anti-solvents. International Journal of Biological Macromolecules, 166 . pp. 940-947. doi:10.1016/j.ijbiomac.2020.10.251 ISSN 0141-8130.
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Official URL: http://dx.doi.org/10.1016/j.ijbiomac.2020.10.251
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.
Item Type: | Journal Article | ||||||||||||||||||
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Subjects: | Q Science > QD Chemistry | ||||||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Solvents , Chitosan , Density functionals , Ionic solutions , Chitosan -- Simulation methods | ||||||||||||||||||
Journal or Publication Title: | International Journal of Biological Macromolecules | ||||||||||||||||||
Publisher: | Elsevier | ||||||||||||||||||
ISSN: | 0141-8130 | ||||||||||||||||||
Official Date: | 1 January 2021 | ||||||||||||||||||
Dates: |
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Volume: | 166 | ||||||||||||||||||
Page Range: | pp. 940-947 | ||||||||||||||||||
DOI: | 10.1016/j.ijbiomac.2020.10.251 | ||||||||||||||||||
Status: | Peer Reviewed | ||||||||||||||||||
Publication Status: | Published | ||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||
Date of first compliant deposit: | 14 December 2020 | ||||||||||||||||||
Date of first compliant Open Access: | 2 November 2021 | ||||||||||||||||||
RIOXX Funder/Project Grant: |
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