The interaction between host- and guest-molecule is accounted for by the high electrical field intensity in the hollow, for example of cyclodextrine, from which follows that there polar and polarizable molecules are bound. It follows further that as a result of the formation of EC, chemical equilibria are shifted toward the side of more strongly polar or more easily polarizable reactants. In the case of proteins one most often has to do with systems which do not comply with a simple mass action law, and then one speaks of an encasing system.

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