Issue 19, 2022

Design and applications of biocompatible choline amino acid ionic liquids

Abstract

Millions of tons of solvents are produced annually and are ubiquitous across many industries ranging from coatings, paintings, textiles, pharmaceuticals, extraction of resources, to chemical synthesis. The global market for solvents is projected to rise as solution processes are typically safer, more efficient, and easier to handle on an industrial scale. Therefore, the search and use of greener solvents are fundamental to our endeavour for a sustainable future. Ionic liquids (ILs) present exciting opportunities as next-generation solvents due to their designer characteristics and high recyclability. However, concerns remain around their toxicity and biocompatibility, and the cost of production is often high due to the low atom economy. Recently, ILs derived from biomolecules have emerged as biocompatible solvents with negligible toxicity and straightforward preparation. Choline amino acid ILs (ChAAILs) are a representative family of biocompatible ILs. They exhibit anion-controlled solvent properties and have been extensively studied for applications including biomass processing and CO2 capture. This review discusses the structure–property relationships of ChAAILs and their mixtures, especially with water. This lays the foundation for the rational design of ChAAIL-based solvent systems with optimised physical properties and reduced costs for specific applications.

Graphical abstract: Design and applications of biocompatible choline amino acid ionic liquids

Article information

Article type
Critical Review
Submitted
16 jun. 2022
Accepted
31 ago. 2022
First published
07 sep. 2022

Green Chem., 2022,24, 7281-7304

Design and applications of biocompatible choline amino acid ionic liquids

S. Miao, R. Atkin and G. Warr, Green Chem., 2022, 24, 7281 DOI: 10.1039/D2GC02282F

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