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

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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

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Publication details

The article was received on 25 Jul 2017, accepted on 01 Aug 2017 and first published on 01 Aug 2017


Article type: Communication
DOI: 10.1039/C7GC02262J
Citation: Green Chem., 2017, Advance Article
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    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, Advance Article , DOI: 10.1039/C7GC02262J

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