Abstract

A theoretical model for the diffusion study of a molecule in suspension in a continuous medium is presented. This model provides a realistic representation of the release by diffusion of a drug in a polymeric matrix at a concentration C 0 above its solubility C s in the medium, in the case where the molecule diffuses into the receptor, similar to what occurs with the donor. The release kinetics is a function of t 1 2 . It contains a numerical parameter β which is a function of the ratio C 0/C s. The table of values of β is g variant of the method of analysis is also presented which has the advantage of not requiring knowledge of the solubility of the molecule in the system, which is often hard to measure in practice. In the experimental section, the theoretical models are validated using the diffusion of testosterone in suspension in a silicic acid gel.

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