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Previous issue date: 2013-03-18 / Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq / Clobetasol propionate is one of the most potent topical corticosteroids usually available and has been established the use in treatment of various skin pathology. However its systemic absorption may cause serious side effects. The use of lipids nanocarriers and application of iontophoretic current shown potential to further controlled release of clobetasol propionate and increase their retention in the stratum corneum, thus making its management more effective and safe. In this study an analytical method was developed and validated for quantification of clobetasol propionate in nanocarriers and pig skin, used as model membranes in vitro permeation studies. Nanostructured lipid carriers (NLC) were obtained by dilution of microemulsion and chitosan-coated NLC (NLC-Ch) by the dripping of NLC in
chitosan solution. The developed nanocarriers were characterized to mean diameter,
polydispersity index, zeta potential, drug loading, recovery and encapsulation
efficiency. The in vitro release and permeation profile of clobetasol free and
nanoencapsulated was evaluated using Franz cells. The nanocariers obtained of 125
nm and uniform size distribution, whit PdI 0,25. The increase in size of NLC-Ch and
the inverting the value of zeta potential, suggest that there was a coating of the CLN
by chitosan, though interaction of charges. The NLC and NLC-Ch showed recovery
values greater than 80% and encapsulation efficiency than 90%. The release profile
of clobetasol from the developed formulations showed a controlled release with 35%
in 24 hours of study. The nanoenapsulation of clobetasol in the NLC-Ch and NLC
resulted in retention increased in the stratum corneum of 9.2 an 7.8 fold, respectively,
compared to free drug. The retention of the clobetasol in the stratum corneum was 4
and 2 times higher when electric current was applied to the formulation CLNQ,
compared to the free drug and encapsulated in NLC, respectively. The accumulation
of the drug in the stratum corneum, promoted by lipid carriers, shows that these
systems are effective for potential topical delivery to minimize the permeation of the
drug into the bloodstream and reduces the side effects. / O propionato de clobetasol é um dos mais potentes corticosteroides tópicos disponíveis atualmente e tem uso consagrado no tratamento de diferentes patologias cutâneas. Contudo, a sua absorção sistêmica pode causar graves efeitos adversos. O uso de nanocarreadores lipídicos e a aplicação de corrente iontoforética
apresentam potencial para promover liberação controlada do propionato de clobetasol e aumentar a sua retenção no estrato córneo, tornando assim sua administração mais segura e efetiva. No presente trabalho, um método cromatográfico foi desenvolvido e validado para quantificação do propionato de clobetasol nos nanocarreadores e na pele de porco, utilizada como modelo de membrana nos estudos de permeação in vitro. Carreadores lipídicos nanoestruturados (CLN) foram obtidos pelo método da diluição de microemulsão e
CLN revestidos com quitosana (CLN-Q) foram obtidos pelo gotejamento dos CLN em solução de quitosana. Os nanocarreadores desenvolvidos foram caracterizados quanto ao diâmetro médio, índice de polidispersividade, potencial zeta, carga de fármaco, recuperação e eficiência de encapsulação. O perfil de liberação e de permeação in vitro do clobetasol livre e nanoencapsulado foi avaliado utilizando células de Franz. Os CLN obtidos apresentaram tamanho de 125 nm e distribuição de tamanho uniforme, com PdI de 0,25. O aumento no tamanho médio dos CLN-Q, para 257 nm, e a inversão no valor de potencial zeta sugerem que houve revestimento dos CLN pela quitosana, por meio de interação de cargas. Os CLN e
CLN-Q apresentaram valores de recuperação maiores que 80% e de eficiência de encapsulação superiores a 90%. O perfil de liberação do clobetasol a partir das formulações desenvolvidas mostrou uma liberação controlada, com cerca de 35% em 24 horas de estudo. A nanoencapsulação do clobetasol nos CLN-Q e CLN
resultou em retenção aumentada do fármaco no estrato córneo de 9,2 e 7,8 vezes, respectivamente, comparado ao fármaco livre. A retenção do clobetasol no estrato córneo foi de 4 e 2 vezes maior quando corrente elétrica foi aplicada na formulação CLNQ, comparado ao fármaco livre e encapsulado nos CLN, respectivamente. O acúmulo do fármaco no estrato córneo, promovido pelos carreadores lipídicos,
mostrou que esses sistemas são efetivos para entrega tópica deste fármaco com potencial para minimizar sua absorção percutânea, e dessa forma, diminuir os seus efeitos adversos.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.bc.ufg.br:tde/3009 |
| Date | 18 March 2013 |
| Creators | Silva, Luis Antônio Dantas |
| Contributors | Marreto, Ricardo Neves, Cutaneous retentio., Taveira, Stephânia Fleury, Marreto, Ricardo Neves, Gratieri, Taís, Taveira, Stephânia Fleury |
| Publisher | Universidade Federal de Goiás, Programa de Pós-graduação em Ciências Farmacêuticas (FF), UFG, Brasil, Faculdade Farmácia - FF (RG) |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | Portuguese |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da UFG, instname:Universidade Federal de Goiás, instacron:UFG |
| Rights | http://creativecommons.org/licenses/by-nc-nd/4.0/, info:eu-repo/semantics/openAccess |
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