RESUMO
Ibuprofen, one of the mostly prescribed nonsteroidal anti-inflammatory drugs (NSAIDs), has been proposed as a topical medication for secondary prevention against skin damage induced by sunburn. The objective of this study was to characterize transmembrane permeation of ibuprofen and sunscreen oxybenzone across poly(dimethyl siloxane) (PDMS) membrane. In vitro diffusion studies were carried out at 37 degrees and 45 degrees C, using a series of ibuprofen and oxybenzone samples, either individually or in combination. Concentrations of ibuprofen and oxybenzone in the receptor compartment for up to 6 h were measured using a high-performance liquid chromatography (HPLC) assay. Ibuprofen and oxybenzone permeated across the PDMS membrane in all diffusion studies. When applied individually, permeation percentages of ibuprofen and oxybenzone ranged from 1.0 to 4.1% and from 13.2 to 25.8%, respectively. When applied in combination, permeation percentages of ibuprofen and oxybenzone were 0.3-1.4% and 7.8-24.3%, respectively. Transmembrane permeation was significantly suppressed when both compounds were present concurrently. High temperature promoted the diffusion process of oxybenzone; a linear correlation was also observed between oxybenzone concentration and its permeation. The proposed permeation enhancement between ibuprofen and oxybenzone was not observed from this study. The potential transdermal interaction and systemic absorption from concurrent application of topical analgesics and sunscreens thus requires further systematic evaluation.
Assuntos
Anti-Inflamatórios não Esteroides/farmacologia , Benzofenonas/farmacologia , Permeabilidade da Membrana Celular/efeitos dos fármacos , Ibuprofeno/farmacologia , Protetores Solares/farmacologia , Administração Tópica , Anti-Inflamatórios não Esteroides/administração & dosagem , Anti-Inflamatórios não Esteroides/uso terapêutico , Benzofenonas/administração & dosagem , Benzofenonas/uso terapêutico , Química Farmacêutica , Cromatografia Líquida de Alta Pressão , Dimetilpolisiloxanos , Combinação de Medicamentos , Interações Medicamentosas , Ibuprofeno/administração & dosagem , Ibuprofeno/uso terapêutico , Membranas Artificiais , Queimadura Solar/prevenção & controle , Protetores Solares/administração & dosagem , Protetores Solares/uso terapêuticoRESUMO
An automated solid-phase extraction method was developed for the determination of the H1-antihistamine acrivastine in plasma samples. Acrivastine was analyzed at the wavelength of 254 nm using a reversed-phase HPLC assay. Both extraction procedure and analytical condition were optimized and validated for maximum recovery and resolution. The developed method was further applied to plasma samples collected from an in vivo pharmacokinetic study in rabbits. The assay was found to be simple, specific, accurate and reproducible.