RESUMO
In this study, clozapine orally disintegrating tablets (ODTs) were prepared by direct compression method. Disintegration time, resistance to crushing of tablets, porosity, friability, dissolution tests were performed and dissolution profiles of ODTs were investigated. Morphological and interaction studies were also performed. Friability values were found to be less than 1%. All tablet formulations disintegrated within 1 min and fulfilled the 3 min disintegration time required for ODTs given in the European Pharmacopoeia. More than 85% of the labeled amount of clozapine was dissolved in 15 min from the ODTs. No interaction or changes were found between active substance and excipients. As a result of the studies, ODT formulations developed in this study can be suggested as promising formulations, which assist development and manufacturing a generic product of clozapine.
Assuntos
Antipsicóticos/administração & dosagem , Antipsicóticos/química , Clozapina/administração & dosagem , Clozapina/química , Varredura Diferencial de Calorimetria , Carboximetilcelulose Sódica , Química Farmacêutica , Composição de Medicamentos , Excipientes , Testes de Dureza , Cinética , Microscopia Eletrônica de Varredura , Porosidade , Povidona , Solubilidade , Espectroscopia de Infravermelho com Transformada de Fourier , Amido , Comprimidos , Difração de Raios XRESUMO
Polymeric scaffold for tissue regeneration was developed for veterinary applications. Oxytetracycline hydrochloride (OTC), which is a widely used antibiotic in veterinary medicine was chosen as the model compound. Gel formulations using chitosan and alginate were prepared in distilled water or in 1% (v/v) acetic acid solution. Sponges were also prepared by a freeze-drying process. Tripolyphosphate was used for cross-linking. Viscosity was decreased in the presence of OTC in chitosan gels whereas no difference was found with alginate gels. All gels showed pseudoplastic behaviour. Water absorption capacity was highest with chitosan/alginate sponges. The solvent used for preparation of the chitosan gels was found to affect the release of OTC. The release of OTC from the sponges was increased by cross-linking. Chitosan/alginate sponges showed the slowest and lowest drug release among the developed sponge formulations in this study. The formulations were found to be biocompatible, inducing no adverse reaction in vivo on surgically formed bone defects of radius of rabbits. The level of organization of the remodelled new bone in the treatment groups was better than that of control. Incorporation of OTC into formulations did not show any considerable enhancing effect.