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Desenvolvimento, caracterização e estudo de liberação in vitro por magnetohipertermia de paclitaxel em nanopartículas lipídicas sólidas magnéticas / Magnetically triggered controlled release of paclitaxel from solid lipid nanoparticles

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Oliveira, Relton Romeis de - Desenvolvimento, caracterização e estudo de liberação in vitro por magnetohipertermia de paclitaxel em nanopartículas lipídicas sólidas magnéticas - 2013 - 62 f. - Dissertação - Programa de Pós-graduação em Ciências Farmacêuticas (FF) - Universidade Federal de Goiás - Goiânia, 2013.
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Previous issue date: 2013-02-28 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / This work describes the development and characterization of magnetic solid lipid nanoparticles (SLNMP) containing paclitaxel for magnetohyperthermia applications. Magnetic nanoparticles were prepared by coprecipitation of Fe(II) and Fe(III) salts in an alkaline medium. SLNMP containing paclitaxel were prepared by emulsification – solvent diffusion. Characterization of the nanostructured system included morphology analysis, average diameter and size distribution, encapsulation efficiency for paclitaxel, stability and magnetic properties of magnetometry and magnetohyperthermia. Magnetic SLNMP containing paclitaxel exhibited an average diameter of 200nm with a polydispersity index of 0,189; which was confirmed by Atomic Force Microscopy. Stability studies conducted with lyophilized samples showed a decrease of approximately 15% in the amount of encapsulated paclitaxel in 30 days. Magnetometry data confirmed the superparamagnetic behavior of the nanocarriers and magnetohyperthermia effect was demonstrated by an increase of 25°C of the temperature of the nanocarrier. A three fold increase in the drug release rate was obtained when the temperature was raised from 25 to 43°C in the in vitro
release assay. This indicated that temperature increase acts as a trigger mechanism
for drug release, allowing the preparation of nanostructured controlled drug delivery systems controlled by magnetohyperthermia. / Este trabalho descreve o desenvolvimento e caracterização de nanopartículas lipídicas sólidas magnéticas contendo paclitaxel para aplicação em magnetohipertermia. Nanopartículas magnéticas foram obtidas pelo método de coprecipitação de sais de Fe(II) e Fe(III) em meio alcalino. Nanopartículas lipídicas sólidas magnéticas contendo paclitaxel foram preparadas pelo método de emulsificação-difusão de solvente. O sistema nanoestruturado foi caracterizado quanto à morfologia, diâmetro médio e distribuição de tamanho, eficiência de encapsulação do paclitaxel, estabilidade e propriedades magnéticas de magnetometria e magnetohipertermia. As nanopartículas lipídicas sólidas magnéticas contendo paclitaxel apresentaram diâmetro médio de aproximadamente 200nm com índice de polidispersão de 0,189 e 67% de eficiência de encapsulação do PTX. O estudo de estabilidade realizado em amostras liofilizadas mostrou redução de aproximadamente 15% do paclitaxel encapsulado no período de 30 dias. Pelo estudo de magnetometria os nanocarreadores apresentaram curva de magnetização condizente com material em regime perparamagnético e o efeito de magnetohipertermia foi verificado pelo aumento da temperatura de
aproximadamente 25ºC do nanocarreador.A taxa de liberação do paclitaxel foi aumentada em 3 vezes quando a temperatura foi elevada de 25ºC para 43ºC no ensaio de liberação in vitro indicando que o aquecimento dos nanocarreadores pode representar um mecanismo desencadeador do processo de liberação do fármaco,
possibilitando a obtenção de sistemas de liberação controlada por magnetohipertermia.

Identiferoai:union.ndltd.org:IBICT/oai:repositorio.bc.ufg.br:tede/3108
Date28 February 2013
CreatorsOliveira, Relton Romeis de
ContributorsLima, Eliana Martins, Bakuzis, Andris Figueiroa, Lima, Eliana Martins, Alonso, Antonio, Taveira, Stephânia Fleury
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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