Release of Benzimidazole and Benzylidene Camphor from Topical Sunscreen Formulations

Autor:	A. Gayte-Sorbier, J. P. Reynier, L. Tchiakpe, V. Aghazarian
Rok vydání:	1999
Předmět:	Administration Topical Skin Absorption Synthetic membrane Pharmaceutical Science Human skin Absorption (skin) Benzylidene Compounds High-performance liquid chromatography Artificial skin Diffusion Camphor chemistry.chemical_compound Drug Discovery Animals Humans Pharmacology Chromatography Estradiol Organic Chemistry Reproducibility of Results Membranes Artificial Rats Membrane chemistry Emulsion Benzimidazoles Emulsions Gels Sunscreening Agents
Zdroj:	Drug Development and Industrial Pharmacy. 25:1277-1282
ISSN:	1520-5762 0363-9045
DOI:	10.1081/ddc-100102299
Popis:	Absorption of two ultraviolet (UV) filters was evaluated through a lipophilic synthetic membrane (Folioxane) and excised hairless rat skin using a flow-through diffusion cell. Folioxane membrane is an artificial skin used in the treatment of third-degree burns. Diffusion tests were performed with aqueous solutions and galenic formulations (one water-in-oil [W/O] emulsion and two oily gels). Analyses were achieved with high-performance liquid chromatography (HPLC) with UV detection at 295 nm. Diffusion kinetics of 17 beta estradiol, a reference compound, through rat skin, human skin, and Folioxane membrane were performed to validate the in vitro model. Phenylbenzimidazole and methylbenzylidene camphor in aqueous solutions were diffused at a regular rate through the Folioxane film. The release of phenylbenzimidazole was very slow, whereas the release of benzylidene camphor was more pronounced: a decrease of the quantity was observed in the donor compartment (30% at 6 hr and 93% after 72 hr). A significant flow of benzylidene camphor was also measured through excised skin of rat in the first 3 hr. The skin absorption was 38% over 72 hr. The W/O emulsion had low penetration of UV filter: 20% of the initial amount for Folioxane membrane and 0.4% for rat skin. In contrast, the penetration of two oily gels was identical: 28% on Folioxane membrane and 0.6% on rat skin. This study demonstrates the transcutaneous diffusion of two important classes of sunscreens through a lipophilic Folioxane membrane and through excised hairless rat skin. From the results, Folioxane membrane appears to be an alternative model for studying diffusion of topical molecules and as a tool for guiding formulation choices.
Databáze:	OpenAIRE
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