Aqueous two-phase partitioning : physical chemistry and by Boris Y. Zaslavsky

By Boris Y. Zaslavsky

Covers the elemental rules of solute partitioning in aqueous two-phase platforms, explains their very important functional positive aspects, and furnishes equipment of characterization. the data supplied via the partition behaviour of a solute in an aqueous two-phase approach is tested

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The most important question in studies of these systems is whether there isa direct solute-additive interaction. The possibility to provide the answer usually depends on the particular experimental technique employ Numerous physical properties ofany component of an aqueous ternary system may be used to monitor the interactionsin such a system. An illustrative example is offered by the data [48,49] that organic additives, such as dimethyl sulphoxide and 1,4-dioxane, acetonitrile and 1,4-dioxane, affect each other's capability of modifying the structure and/or the energy distribution of the water-water H-bonds when wate is presentin a great excess.

It may be assumed that the composition of the water-richmixture corresponding to the first linear fragment of each curve plottedin Fig. 2 should be consideredas that of an aqueous solution of a given organic solvent. The latter linear fragment seems to correspond to solutions of water in the solvent, while the intermediate one represents the socalled water-organic solvent mixtures. Actually the typical dependence of a physicochemical property ofa liquid mixtureis generally described bya curve characterized as [39,40]: where A is the quantitative measure of the property examined;% is the molar concentration ofthe more polar component;A0 is the value of the property A in the pure componentwith lower polarity; the pure componentwith lower polarity; AD and c* are the empirical parameters of the equation.

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