Cooperativity between various types of polar solute-solvent interactions in aqueous media
authors Madeira, PP; Bessa, A; Loureiro, JA; Alvares-Ribeiro, L; Rodrigues, AE; Zaslavsky, BY
nationality International
journal JOURNAL OF CHROMATOGRAPHY A
author keywords Aqueous two-phase partitioning; Salt additives; Hofmeister effect; Solute-water interactions; Solvatochromic comparison method
keywords SOLVATION ENERGY RELATIONSHIP; 2-PHASE SYSTEMS; ORGANIC-COMPOUNDS; WATER INTERACTIONS; PHASE-SEPARATION; METHYLENE GROUP; COMPARTMENTALIZATION; MOLECULES; RESPONSES; PROTEINS
abstract Partition coefficients of seven low molecular weight compounds were measured in multiple aqueous two-phase systems (ATPSs) formed by pairs of different polymers. The ionic composition of each ATPS was varied to include 0.01 M sodium phosphate buffer (NaPB), pH 7.4 and 0.1 M Na2SO4, 0.15 M NaCl, and 0.15 M NaClO4 all in 0.01 M NaPB, pH 7.4. The differences between the solvent features of the coexisting phases in all the ATPSs were estimated from partitioning of a homologous series of dinitrophenylated-amino acids and by the solvatochromic method. The solute-specific coefficients for the compounds examined were determined by the multiple linear regression analysis using the modified linear solvation energy relationship equation. It is established that the solute specific coefficients characterizing different types of the solute-water interactions (dipole-dipole, dipole-ion, and H-bonding) for a given solute change in the presence of different salt additives in the solute specific manner. It is also found that these characteristics are linearly interrelated. It is suggested that there is a cooperativity between various types of solute-water interactions governed by the solute structure. (C) 2015 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0021-9673
year published 2015
volume 1408
beginning page 108
ending page 117
digital object identifier (doi) 10.1016/j.chroma.2015.07.002
web of science category Biochemical Research Methods; Chemistry, Analytical
subject category Biochemistry & Molecular Biology; Chemistry
unique article identifier WOS:000359327100014
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