Issue 17, 2017

Designing the thermal behaviour of aqueous biphasic systems composed of ammonium-based zwitterions

Abstract

The ability of water-soluble ammonium-based zwitterions (ZIs) to form aqueous biphasic systems (ABS) in the presence of aqueous solutions of salts is disclosed here. These systems are thermoreversible at temperatures close to room temperature and further allow the design of their thermal behavior, from an upper critical solution temperature (UCST) to a lower critical solution temperature (LCST), by increasing the ZI alkyl chain length. The investigated thermoreversible ABS are more versatile than typical liquid–liquid systems, and can be applied in a wide range of temperatures and compositions envisaging a target separation process. An example is given regarding their ability to selectively separate mixtures of aromatic and aliphatic amino acids in a single-step.

Graphical abstract: Designing the thermal behaviour of aqueous biphasic systems composed of ammonium-based zwitterions

Supplementary files

Article information

Article type
Communication
Submitted
25 Jul 2017
Accepted
01 Aga 2017
First published
01 Aga 2017

Green Chem., 2017,19, 4012-4016

Designing the thermal behaviour of aqueous biphasic systems composed of ammonium-based zwitterions

A. M. Ferreira, H. Passos, A. Okafuji, M. G. Freire, J. A. P. Coutinho and H. Ohno, Green Chem., 2017, 19, 4012 DOI: 10.1039/C7GC02262J

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