Because the hydration
degree of these anionic complexes is lower and
compatible with the hydration environment of
PEG-rich phase, their partition occurs
immediately and this is quantitative one. The
anionic species formed at interface, cross like they
are into PEG-rich phases, where they will interact
predominantly by ionic forces with the other
oxygen atoms from PEG molecules. These
interactions affect only the bridging water
molecules.