DESENVOLVIMENTO TECNOLÓGICO E AVALIAÇÃO DOS PERFIS DE LIBERAÇÃO IN VITRO DE SUSPENSÕES CONTENDO NANOCÁPSULAS DE DESONIDA COM DIFERENTES POLÍMEROS
| Ano de defesa: | 2012 |
|---|---|
| Autor(a) principal: |
Antonow, Michelli Barcelos
 |
| Orientador(a): |
Raffin, Renata Platcheck
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| Banca de defesa: | |
| Tipo de documento: | Dissertação |
| Tipo de acesso: | Acesso aberto |
| Idioma: | por |
| Instituição de defesa: |
Universidade Franciscana
|
| Programa de Pós-Graduação: |
Mestrado Acadêmico em Nanociências
|
| Departamento: |
Biociências e Nanomateriais
|
| País: |
BR
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| Palavras-chave em Português: | |
| Palavras-chave em Inglês: | |
| Área do conhecimento CNPq: | |
| Link de acesso: | http://tede.universidadefranciscana.edu.br:8080/handle/UFN-BDTD/200 http://www.tede.universidadefranciscana.edu.br:8080/handle/UFN-BDTD/306 |
Resumo: | Desonide is a topical corticosteroid that has been used for more than 30 years, however, its prolonged use can induce several side effects, affecting dermis and epidermis. The use of nanocarriers, such as polymeric nanocapsules, allows controlled drug release and a physico-chemical study is necessary for the better understanding of these systems. In this context, the aim of this study was to develop and characterize nanocapsule suspensions (NC) containing desonide, proposing controlled drug release and elucidation of the drug release mechanism using different polymers: poly-E- caprolactona (NC PCL), Eudragit® L100 (NC L100) and Eudragit® S100 (NC S100). The suspensions were characterized in terms of pH, particle average size, polydispersity index, zeta potential and drug content. NC presented acid pH, diameter particle lower than 240 nm, polydispersity index lower than 0.2, zeta potential ranging from -21.7 to - 26.7 mV and encapsulation efficiency greater than 91% for all formulations. For the drug release studies, dialysis technique (using dialysis bags), dissolution using Franz cells and conventional dissolution were performed with the purpose of comparing the results and understanding the release mechanism. For the mathematical modeling, the monoexponential, biexponential and Korsmeyer-Peppas equations were applied. The encapsulation of desonide in NC modified the release parameters comparing to the pure drug and the NC prepared with different polymers presented different behaviors, depending on the dissolution method. The adjustment to Korsmeyer-Peppas model indicated that the release of NC desonide from the experiment using Franz cell occurred in all formulations by diffusion, however, and in the experiment with dialysis bags release was classified as anomalous transport. However, as there was a decrease in particle size during the experiment for the release for NC S100 and NC L100 indicating the erosion process and for NC PCL the size remained constant indicating the presence of only diffusion.In this way, the Korsmeyer Peppas equation was not adequate for the determination of the release mechanism from NC. |