Toggle Main Menu Toggle Search

Open Access padlockePrints

Green synthesis of acetylated maize starch in different imidazolium carboxylate and choline carboxylate ionic liquids

Lookup NU author(s): Dr David XieORCiD



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


This work demonstrates that acetylated maize starches (AMS) with varied degree of substitution (DS, 0.26–2.63) was synthesized in ionic liquids (ILs) (imidazolium chloride, imidazolium carboxylate and choline carboxylate) at 85 °C without catalyst. The DS of AMS and reaction efficiency increased with decreasing alkyl chain length of cations or anions, while decreased as the choline cation replaced the imidazolium cation and the chloride anion replaced the acetate anion. The AMS synthesized in imidazolium-based ILs exhibited much higher hydrophobicity and thermal stability than the native starch. Rheological properties of ILs and ATR-FTIR analysis of acetic anhydride/ILs mixtures indicated that a shorter alkyl side chain or the combination of an imidazolium cation and an acetate anion gave ILs lower viscosities and weaker interactions between acetic anhydride molecules, which favored the acetylation of starch. These findings provide insights into the design of green processes to modify starch and the application of acetylated starch.

Publication metadata

Author(s): Ren F, Wang J, Yu J, Zhong C, Xie F, Wang S

Publication type: Article

Publication status: Published

Journal: Carbohydrate Polymers

Year: 2022

Volume: 288

Print publication date: 15/07/2022

Online publication date: 17/03/2022

Acceptance date: 09/03/2022

Date deposited: 23/03/2022

ISSN (print): 0144-8617

ISSN (electronic): 1879-1344

Publisher: Elsevier


DOI: 10.1016/j.carbpol.2022.119353

ePrints DOI: 10.57711/3pb7-x664


Altmetrics provided by Altmetric


Funder referenceFunder name