resumo
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.
palavras-chave
TEMPERATURE IONIC LIQUIDS; SATURATED WATER-CONTENT; METAL-OXIDES; EXTRACTION; PHASE; MIXTURES; PARTITION; PROTEINS; RECOVERY; SOLVENT
categoria
Chemistry; Science & Technology - Other Topics
autores
Ferreira, AM; Passos, H; Okafuji, A; Freire, MG; Coutinho, JAP; Ohno, H
nossos autores
Ana Maria da Conceição Ferreira Takahashi
Investigador Júnior
Helena Isabel Sousa Passos
Investigador Júnior
Mara Guadalupe Freire Martins
Investigador CoordenadorGrupos
G4 - Materiais Renováveis e Economia Circular
G5 - Materiais Biomiméticos, Biológicos e Vivos
Projectos
CICECO - Aveiro Institute of Materials (UID/CTM/50011/2013)
Igy Technology: A Purication Platform using Ionic-Liquid-Based Aqueous Biphasic Systems (IGYPURTECH)
agradecimentos
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.