Filmes poliméricos de quitosana com sinvastatina para inflamações cutâneas

Abstract

Chitosan is a polysaccharide derived from chitin has been arousing great interest in the tissue regeneration area, especially because of its biodegradability characteristics, biocompatibility and antimicrobial activity. It has also been frequently used in systems for controlled drug release, especially for the low aqueous solubility, such as simvastatin. Simvastatin, statin with hypolipidemic activity, in several studies have been show an interesting anti-inflammatory activity by an independent primary mechanism of action. However, those pharmaceutical forms in which this drug is available, unfeasible its use in cutaneous lesions. Therefore, the aim of this work was to develop and evaluate polymerics films for topical delivery of simvastatin. Chitosan, coming from two suppliers, was utilized to prepare films containing two concentrations of simvastatin (10 and 20 mg) for Sol-gel method. Fourier-transform infrared spectroscopy, X-ray diffraction and Thermal analysis were used to structural characterization. Additionally, in vitro release study using the Franz apparatus was realized. To in vivo testing, determination of residual wound area and total leukocyte count was conducted by analyzing statistically the data collected. In the infrared spectrum can be inferred that there were several intermolecular interactions between chitosan and simvastatin, while the X-ray diffraction and Thermal analysis, indicated the presence of the drug in amorphous form in the polymeric film. The films displayed similar release profiles, with its release governed by an anomalous transport, described in the Korsmeyer-Peppas model and in vivo evaluation of anti-inflammatory and wound healing activity, the groups receiving treatment with films with simvastatin 20 mg significantly reduced (p˂0.05) the leukocyte response and had the most efficient cicatrization that groups with white film and SALINA. Evidencing, the developed films are promising for the controlled administration of simvastatin topically in skin inflammation.