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Desenvolvimento de sistemas lipídicos nanoestruturados contendo paclitaxel: estudos de permeação cutânea / Devolopment of placlitaxel- loaded lipid nanoparticles: skin permeation sudies

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Previous issue date: 2014-01-29 / Fundação de Amparo à Pesquisa do Estado de Goiás - FAPEG / Paclitaxel (PTX) is a natural product extracted from the bark of the Pacific Yew and has numerous antitumor actions, including skin cancers. The topical treatment of skin and pre-cancerous lesions cancer is desired, since the systemic treatment has many side effects However, PTX to be incorporated into formulations suitable for it to penetrate the stratum corneum and skin tumors reached. Lipid nanoparticles have potential to increase drug retention in the stratum corneum, thus providing controlled release and great percutaneous absorption. Within this context, the aim of this study was to develop and characterize solid lipid nanoparticles (SLN) and nanostructured lipid carriers (NLC) containing the antineoplastic PTX and evaluate its permeation into the pig ear skin in vertical diffusion cells type "Franz". Quantification of PTX paclitaxel was performed by high performance liquid chromatography. The NLS and CLNs were obtained by the method of dilution of the microemulsion containingcetylpyridinium chloride, glyceryl behenate, triglycerides of caprylic / capric acid, polysorbate 80 and sorbitan trioleate 85. The particles were characterized by medium size, PdI, zeta potential, encapsulation efficiency, drug loading and recovery. Stability studies were carried out for a period of 30 days with storage at 4 °C (± 2 °C). Theskin permeation studies of the PTX nanoparticles were conducted in “Franz” type diffusion cells in pig ear skin. The NLS obtained showed average size of 314.1 ± 10.9 to 335.9 ± 0.9nm. The CLN obtained with more oil in the lipid matrix (CLN100)showed average size 270.6 ± 13.5 nm. The encapsulation efficiency of the systemsobtained was above 90% when 3.75% was added PTX formulations. The stability studies revealed a trend in increasing the size of the particles PdI along the storage period, but these differences are not statistically significant. The CLN100 increased about 3 times the amount of drug in the stratum corneum (SC) as compared to the administration of unencapsulated drug and also increased by 1.5 times the amount of PTX in the SC in relation to the topical application of other lipid particles. Thus, the lipid particles appear to be promising systems for topical application of PTX. / O paclitaxel (PTX) é um produto natural extraído da casca do Teixo do Pacífico e possui númeras ações antitumorais, inclusive em neoplasias cutâneas. O tratamento tópico do câncer de pele e de lesões pré-cancerígenas é almejado, visto que o tratamento sistêmico possui diversos efeitos colaterais. Entretanto, o PTX precisa ser incorporado em formulações adequadas para que o mesmo penetre no estrato córneo e atinja os tumores cutâneos. As nanopartículas lipídicas apresentampotencial para aumentar a retenção de fármacos no estrato córneo, proporcionandouma liberação controlada e um aumento na absorção percutânea. Dentro destecontexto, o objetivo deste trabalho foi desenvolver e caracterizar nanopartículaslipídicas sólidas (NLS) e carreadores lipídicos nanoestruturados (CLN) contendo o antineoplásico PTX e avaliar sua permeação cutânea em pele de orelha de suíno em células de difusão vertical tipo “Franz”. A quantificação do paclitaxel PTX foi realizada por cromatografia líquida de alta eficiência. As NLS e CLN foram obtidas pelo método de diluição da microemulsão contendo cloreto de cetilpiridínio, behenato de glicerila, triglicerídeos do ácido cáprico/ caprílico, polissorbato 80 e trioleato de sorbitano 85. As partículas foram caracterizadas quanto ao tamanho médio, PdI, potencial zeta, eficiência de encapsulação, carga de fármaco e recuperação. Os estudos de estabilidade foram realizados por um período de 30 dias com armazenamento a 4°C (± 2°C). Os estudos de permeação cutânea do PTX nas nanopartículas foram realizados em células de difusão tipo “Franz” em pele de orelha de suíno. As NLS obtidas apresentaram tamanho médio entre 314,1 ± 10,9 a 335,9 ± 0,9nm. Os CLN obtidos com mais óleo na matriz lipídica (CLN100), apresentaram tamanho médio 270,6 ± 13,5nm. A eficiência de encapsulação dos sistemas obtidos foi superior a 90% quando 3,75% de PTX foi adicionado as formulações. Nos estudos de estabilidade observou-se uma tendência no aumento do tamanho e PdI das partículas ao longo do período de armazenamento, porém estas diferenças não são estatisticamente significativas. Os CLN100 aumentaram aproximadamente 3 vezes a quantidade de fármaco no estrato córneo (EC) quando comparados com a administração do fármaco não encapsulado e, ainda ,aumentaram 1,5 vezes a quantidade de PTX no EC em relação à aplicação tópica das demais partículas lipídicas. Desta forma, as partículas lipídicas parecem ser sistemas promissores para aplicação tópica do PTX.

Identiferoai:union.ndltd.org:IBICT/oai:repositorio.bc.ufg.br:tde/3004
Date29 January 2014
CreatorsTosta, Fabiana Vaz
ContributorsTaveira, Stephânia Fleury, LIma, Eliana Martins, Taveira, Stephânia Fleury, Marreto, Ricardo Neves, Lopes, Flávio Marques
PublisherUniversidade Federal de Goiás, Programa de Pós-graduação em Ciências Farmacêuticas (FF), UFG, Brasil, Faculdade Farmácia - FF (RG)
Source SetsIBICT Brazilian ETDs
LanguagePortuguese
Detected LanguagePortuguese
Typeinfo:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis
Formatapplication/pdf
Sourcereponame:Biblioteca Digital de Teses e Dissertações da UFG, instname:Universidade Federal de Goiás, instacron:UFG
Rightshttp://creativecommons.org/licenses/by-nc-nd/4.0/, info:eu-repo/semantics/openAccess
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