| Abstract
| - The polyethylene glycol−sodium sulfate aqueous two-phase system has been characterized at 23 °C. Tie-lines for the phase diagram were obtained experimentally. Phases in equilibrium were characterized by meansof the solvatochromic parameters π*, α, and β, which provide a measurement of the polarity/polarizabilityand the H-bond donor and acceptor abilities, respectively. The ability of the phases to participate in hydrophobicinteractions was characterized by means of the free energy of transfer of a methylene group between theconjugated phases, using the partition of a homologous series of dinitrophenylated amino acids. The resultsshow the effect of the presence of polymer and salt in the aqueous phase, and a comparison of both phaseswith pure water is made.
|
