By Boris Y. Zaslavsky
Covers the elemental ideas of solute partitioning in aqueous two-phase structures, explains their very important sensible beneficial properties, and furnishes equipment of characterization. the knowledge supplied through the partition behaviour of a solute in an aqueous two-phase approach is tested.
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Extra info for Aqueous Two-phase Partitioning
The hydration number then may be defined as the amount of the water molecules associated with or affected by the ion. The hydration number has been used in same casesas a measure of the water-perturbing efficiency ofan ion. It should in the literature not only be noted that the hydration number measure is applied to the ionic but also to non-ionic solutes. Various experimental techniques differ in their sensitivity to the effect aofgiven additive on the features of its aqueous solution. 582-6061).
E. the phase is more hydrophobic than pure water. The differences observed for hexane and cyclohexane imply that the effect of an additive on the aqueous medium in regard to its affinity for a CH2 group should not be attributed just to nonpolar character of the additive. It should be particularly noted that any direct interaction between a solute, suchas inert gases, alkanes and alkane-like compounds, and an additive presentin the aqueous phase ishighly unlikely in the case under consideration.
82] point toa strong repulsion between hydration spheres aroundK+ and F ions orNa' and Br- ions indicating that the structures of water in these spheresare incompatible. ,is supposed [83,84] tobe the cause of a reducedsalt concentration in the water zone surrounding the polymer chain (in more details see below). About 60 years ago Bernal and Fowler introduced still widely used though oversimplified terms "structure-breaking" and "structure-making"to de- Water in the Presence of Additives 31 scribe the effects of different ions on the structure of water.
Aqueous Two-phase Partitioning by Boris Y. Zaslavsky