Aqueous two-phase system

Aqueous biphasic systems (ABS) or aqueous two phase systems (ATPS) are clean alternatives for traditional organic-water solvent extraction systems.

ABS are formed when either two polymers, one polymer and one kosmotropic salt, or two salts (one chaotropic salt and the other a kosmotropic salt) are mixed at appropriate concentrations or at a particular temperature. The two phases are mostly composed of water and non volatile components, thus eliminating volatile organic compounds. They have been used for many years in biotechnological applications as non-denaturing and benign separation media. Recently, they have been used for metal ion separations, environmental remediation, metallurgical applications and as a reaction media.