Formulation and Evaluation of Gel-Loaded Microsponges of Clarithromycin for Topical Delivery
In this study Eudragit RS 100 facilitated microsponges were prepared by the double emulsification technique (Quasi emulsion technique) and subsequently dispersed in a carbopol gel base for controlled delivery of clarithromycin to the skin. The microsponges formulations were prepared by quasi emulsion solvent diffusion method employing Eudragit RS 100 as a polymer. The compatibility of the drug with formulation components was established by Fourier Transform Infra-Red (FTIR) spectroscopy. The surface morphology, particle size, production yield, and drug content and encapsulation efficiency of microsponges were examined. Shape and surface morphology of the microsponges were examined using scanning electron microscopy. Particle size of prepared microsponges was observed in the range of 103.8 to 140.2µm. Scanning electron microscopy revealed the porous, spherical nature of the microsponges. SEM photographs revealed the spherical nature of the microsponges in all variations; however, at higher ratios, drug crystals were observed on the microsponge surface. Increase in the drug/polymer ratio (1:1 to 1:5) increased their yield (60.00 to 87.05), average particle size of all formulations ranges from 80.00 μm to 90.00 μm which is in increasing order due to the increase in the concentration of polymer but after certain concentration it was observed that as the ratio of drug to polymer was increased, the particle size decreased, The pH of the gel was determined having average pH of 6.3 ± 0.2, The viscosity of the formulation was analysed by Brookfield viscometer with maximum reading of 1723 and minimum reading of 1720 cps, the drug content of different formulations was found in the range 95.2 to 99.8%, the spredibility of gel containing microsponges revealed in the range of 17.4 to 25.10 showing good characteristics of spreading, the cumulative release of the formulations are in the range of 61.1% to 75.4%.
Keywords: Microsponges, Clarithromycin, Eudragit RS 100, Sustained and controlled release, Scanning Electron Microscopy (SEM)
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