TY - JOUR
T1 - Regeneration behavior of chitosan from ionic liquid using water and alcohols as anti-solvents
AU - Tan, Xiaoyan
AU - Wang, Guowei
AU - Zhong, Lei
AU - Xie, Fengwei
AU - Lan, Ping
AU - Chi, Bo
N1 - Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2021/1/1
Y1 - 2021/1/1
N2 - 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.
AB - 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.
KW - 1-Ethyl-3-methylimidazolium acetate
KW - Anti-solvent
KW - Chitosan regeneration
KW - Density functional theory
KW - Ionic liquid
KW - Molecular simulation
UR - http://www.scopus.com/inward/record.url?scp=85095789952&partnerID=8YFLogxK
U2 - 10.1016/j.ijbiomac.2020.10.251
DO - 10.1016/j.ijbiomac.2020.10.251
M3 - 文章
C2 - 33152361
AN - SCOPUS:85095789952
SN - 0141-8130
VL - 166
SP - 940
EP - 947
JO - International Journal of Biological Macromolecules
JF - International Journal of Biological Macromolecules
ER -