Nine binary mixtures of seven different methacrylic copolymer systems (Plastoid(®) E 35 L (PLE) and Plastoid(®) L 50 (PLL); Eudragit(®) (Eu) NE, RL, RS, L, S) were tested as components of monolayer patches containing miconazole. Only three mixtures (PLE:EuNE, PLE:EuRL and PLE:EuRS) were suitable for the preparation of placebo matrices. Miconazole patches with good technological characteristics were obtained by using mixtures of PLE:EuNE and PLE:EuRL. The in vitro miconazole release rate from the two patches and from the patch prepared using only PLE were significantly different. The amounts of drug released in 24 h were quite satisfactory. A mathematical model based on capillary viscometry data was used for the evaluation of interactions between copolymers. This was useful to predict and understand the mechanisms related to the instability of the prepared mixture. The solubility parameters of the drug and of the matrix were also calculated. Miconazole release was faster when the difference between the solubility parameters of the matrix and of the drug was higher. A relationship between miconazole release rate and the difference of drug and matrix solubility parameters was found. Therefore, the solubility parameter could be applied in formulation studies of patches. Copyright (C) 1999 Elsevier Science B.V.
Application of viscometry and solubility parameters in miconazole patches development / P. Minghetti, F. Cilurzo, A. Casiraghi, L. Montanari. - In: INTERNATIONAL JOURNAL OF PHARMACEUTICS. - ISSN 0378-5173. - 190:1(1999), pp. 91-101.
|Titolo:||Application of viscometry and solubility parameters in miconazole patches development|
MINGHETTI, PAOLA (Primo)
CILURZO, FRANCESCO (Secondo)
CASIRAGHI, ANTONELLA (Penultimo)
MONTANARI, LUISA (Ultimo)
|Settore Scientifico Disciplinare:||Settore CHIM/09 - Farmaceutico Tecnologico Applicativo|
|Data di pubblicazione:||1999|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/S0378-5173(99)00282-3|
|Appare nelle tipologie:||01 - Articolo su periodico|