Analysis of partitioning of organic compounds and proteins in aqueous polyethylene glycol-sodium sulfate aqueous two-phase systems in terms of solute-solvent interactions
authors da Silva, NR; Ferreira, LA; Madeira, PP; Teixeira, JA; Uversky, VN; Zaslavsky, BY
nationality International
journal JOURNAL OF CHROMATOGRAPHY A
author keywords Aqueous two-phase system; Partitioning; Proteins; Solute-water interactions; Solvatochromic comparison method; Solvent properties
keywords WATER INTERACTIONS; BIPHASIC SYSTEMS; PLASMID DNA; EXTRACTION; ENVIRONMENTS; OSMOLYTES; OPTIMIZATION; TECHNOLOGY; SEPARATION; RESPONSES
abstract Partition behavior of nine small organic compounds and six proteins was examined in poly(ethylene glycol)-8000-sodium sulfate aqueous two-phase systems containing 0.5 M osmolyte (sorbitol, sucrose, trehalose, TMAO) and poly(ethylene glycol)-10000-sodium sulfate system, all in 0.01 M sodium phosphate buffer, pH 6.8. The differences between the solvent properties of the coexisting phases (solvent dipolarity/polarizability, hydrogen bond donor acidity, and hydrogen bond acceptor basicity) were characterized with solvatochromic dyes using the solvatochromic comparison method. Differences between the electrostatic properties of the phases were determined by analysis of partitioning of sodium salts of dinitrophenylated (DNP-) amino acids with aliphatic alkyl side-chain. It was found out that the partition coefficient of all compounds examined (including proteins) may be described in terms of solute solvent interactions. The results obtained in the study show that solute solvent interactions of nonionic organic compounds and proteins in polyethylene glycol-sodium sulfate aqueous two-phase system differ from those in polyethylene glycol-dextran system. (C) 2015 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0021-9673
year published 2015
volume 1415
beginning page 1
ending page 10
digital object identifier (doi) 10.1016/j.chroma.2015.08.053
web of science category Biochemical Research Methods; Chemistry, Analytical
subject category Biochemistry & Molecular Biology; Chemistry
unique article identifier WOS:000361865200001
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