Equilibrium Studies on the Self-Association of Drugs in Aqueous Solution
Equilibrium studies of aqueous solutions of amphiphilic drug molecules have indicated a dependency of the mode of association on the structure of the hydrophobic moiety. The association behaviour of drugs possessing diphenylmethane hydrophobic groups may be described using the mass action theory of micellization. In contrast, some drugs with tricyclic hydrophobic moieties exhibit continuous association with no apparent critical micelle concentration. The association behaviour of these drugs may be described by a stepwise association model. Apparent nonmicellar association is observed with maleate salts of amphiphilic drugs containing pyridine rings. Relaxation studies have revealed an interionic proton transfer process in such systems.
KeywordsHydrophobic Moiety Association Behaviour Sodium Maleate Propantheline Bromide Diphenhydramine Hydrochloride
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