Physicochemical characterization of the PEG8000-Na2SO4 aqueous two-phase system
authors Rodriguez, O; Silverio, SC; Madeira, PP; Teixeira, JA; Macedo, EA
nationality International
journal INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
keywords SOLVATION ENERGY RELATIONSHIP; BIPHASIC SYSTEMS; POLYETHYLENE-GLYCOL; SOLVENT POLARITY; METHYLENE GROUP; LIQUID-LIQUID; SALT; 25-DEGREES-C; EXTRACTION; MOLECULES
abstract The polyethylene glycol-sodium sulfate aqueous two-phase system has been characterized at 23 degrees C. Tie-lines for the phase diagram were obtained experimentally. Phases in equilibrium were characterized by means of the solvatochromic parameters pi*, alpha, and beta, which provide a measurement of the polarity/polarizability and the H-bond donor and acceptor abilities, respectively. The ability of the phases to participate in hydrophobic interactions was characterized by means of the free energy of transfer of a methylene group between the conjugated phases, using the partition of a homologous series of dinitrophenylated amino acids. The results show the effect of the presence of polymer and salt in the aqueous phase, and a comparison of both phases with pure water is made.
publisher AMER CHEMICAL SOC
issn 0888-5885
year published 2007
volume 46
issue 24
beginning page 8199
ending page 8204
digital object identifier (doi) 10.1021/ie070473f
web of science category Engineering, Chemical
subject category Engineering
unique article identifier WOS:000250931400043
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journal analysis (jcr 2019):
journal impact factor 3.573
5 year journal impact factor 3.684
category normalized journal impact factor percentile 69.58
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