Effect of NaCl additive on properties of aqueous PEG-sodium sulfate two-phase system

被引：26
作者：
Ferreira, Luisa A. [1 ,2 ]
Parpot, Pier [3 ]
Teixeira, Jose A. [2 ]
Mikheeva, Larissa M. [1 ]
Zaslavsky, Boris Y. [1 ]
机构：
[1] Analiza Inc, Cleveland, OH 44114 USA
[2] Univ Minho, Ctr Biol Engn, IBB, P-4710057 Braga, Portugal
[3] Univ Minho, Dept Quim, P-4710057 Braga, Portugal
来源：
JOURNAL OF CHROMATOGRAPHY A | 2012年 / 1220卷
关键词：
Aqueous two-phase systems; Salt additives; Non-ionic solutes partitioning; Solvatochromic solvent features; Solute dipolarity/polarizability; Solute hydrogen bond acidity; Solute hydrogen bond basicity; SOLVENT PROPERTIES; FREE-ENERGY; THEORETICAL PREDICTION; METHYLENE GROUP; PARTITION; PARAMETER;
D O I：
10.1016/j.chroma.2011.12.001
中图分类号：
Q5 [生物化学];
学科分类号：
071010 ; 081704 ;
摘要：
The concentrations of all components in the phases of aqueous two-phase polyethylene glycol-sodium sulfate system of a fixed composition with different concentrations of NaCl additive were determined. Solvatochromic solvent features of aqueous media in the phases of all the systems were characterized in terms of solvent dipolarity/polarizability, solvent hydrogen bond donor acidity and hydrogen bond acceptor basicity. Partitioning of a homologous series of dinitrophenylated amino acids with aliphatic alkyl side chain was examined in all the systems, and the differences between the relative hydrophobicity and electrostatic properties of the phases were quantified. These differences were described in terms of solvatochromic solvent features of the phases. The previously reported partition coefficients of twelve different nonionic compounds in all the systems were expressed in terms of solute descriptors. It is demonstrated that two solvatochromic solvent descriptors (solvent dipolarity/polarizability, and solvent hydrogen bond donor acidity) could adequately describe the partitioning of the solutes in all the systems employed. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码：14 / 20
页数：7
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