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 liquidliquid 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.
keywords
TEMPERATURE IONIC LIQUIDS; SATURATED WATER-CONTENT; METAL-OXIDES; EXTRACTION; PHASE; MIXTURES; PARTITION; PROTEINS; RECOVERY; SOLVENT
subject category
Chemistry; Science & Technology - Other Topics
authors
Ferreira, AM; Passos, H; Okafuji, A; Freire, MG; Coutinho, JAP; Ohno, H
our authors
Ana Maria da Conceição Ferreira Takahashi
Junior Researcher
Helena Isabel Sousa Passos
Junior Researcher
Mara Guadalupe Freire Martins
Coordinating ResearcherGroups
G4 - Renewable Materials and Circular Economy
G5 - Biomimetic, Biological and Living Materials
Projects
CICECO - Aveiro Institute of Materials (UID/CTM/50011/2013)
Igy Technology: A Purication Platform using Ionic-Liquid-Based Aqueous Biphasic Systems (IGYPURTECH)
acknowledgements
This work was developed in the scope of the project CICECO-Aveiro Institute of Materials (Ref. FCT UID/CTM/50011/2013), financed by national funds through the FCT/MEC and when applicable co-financed by FEDER under the PT2020 Partnership Agreement. The authors also acknowledge the FCT for the doctoral grants SFRH/BD/85248/2012 and SFRH/BD/92200/2013 of H. P. and A. M. F., respectively. M.G.F. acknowledges the European Research Council under the European Union's Seventh Framework Programme (FP7/2007-2013)/ERC Grant 337753.