Abstract
The solubilization of lipophilic amlodipine (Am is a antihypertensive drug) and nonionic surfactant glyceryl monolaurate (GML is a skin permeation enhancer), as well as their joint solubilization (co-solubilization) have been measured by UV spectroscopy and refractometry in aqueous micellar solutions of Tween 80 (Tw). The properties of mixed micelles (Tw + GML, Tw + Am, Tw + GML + Am) have been studied, including the aggregation number of components, the localization of solubilizates, diffusion coefficients, the size and the degree of hydration. As a result of co-solubilization, (Tw + GML + Am) three-component micelles contain 4.2 times more molecules of the drug than (Tw + Am) two-component micelles. The experimental data on the kinetics of mass transfer of Am by micelles based on Tw are in good agreement with the calculations under diffusion theory; furthermore, three-component micelles carry Am more effectively than two-component micelles.
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