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000680523.pdf: 1511132 bytes, checksum: c20e5a6a65edf2cba90d4de2b5073a08 (MD5) / Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) / Nanopartículas magnéticas (NPMs) têm sido alvo de inúmeras investigações por seu grande potencial de aplicação nos mais diferentes campos tecnológicos. Dentre tantos, elas destacam-se na área biomédica, seja no diagnóstico ou tratamento de diversas doenças. Neste trabalho foram sintetizadas nanopartículas magnéticas (NPMs) de óxido de ferro (magnetita) pelo método de coprecipitação de íons Fe2+ e Fe3+ em meio alcalino. O objetivo central foi estudar as características morfológicas, estruturais, magnéticas e o comportamento biológico desses compostos em células cancerígenas, visando futuras aplicações biomédicas. Inicialmente as nanopartículas magnéticas foram avaliadas em função dos parâmetros físico-químicos que influenciam diretamente as características finais do produto (pH, molaridade, temperatura e tipo de base) para se observar as melhores condições de síntese e a influência de cada um nas características do produto. As nanopartículas foram caracterizadas por difratometria de raios-X, microscopia eletrônica de varredura, potencial zeta e magnetometria. Desse primeiro estudo concluiu-se que a coprecipitação produz partículas com polidispersão de tamanhos alta e que os parâmetros de síntese influenciam drasticamente as propriedades dos materiais, no entanto, todas as amostras exibiam características magnéticas. Depois de estabelecida esta etapa, as NPMs foram submetidas à transfecção em cultura celular de carcinoma cervical humano (células HeLa) e a testes biológicos como coloração com Azul da Prússia e hematoxilina-eosina, ensaio de MTT e ensaio de apoptose para averiguação da citotoxidade. A principal observação vinda desses resultados foi que as nanopartículas magnéticas sintetizadas, salvo algumas adaptações de síntese... / Magnetic nanoparticles (MNPs) have been the subject of numerous investigations because of its great potential application in many different fields of technology. Among many, they stand out in the biomedical area, either in diagnosis or treatment of various diseases. In this work were synthesized magnetic nanoparticles (MNPs) of iron oxide (magnetite) by the coprecipitation method of Fe2+ and Fe3+ in an alkaline medium. The main objective was to study the morphological, structural, magnetic and biological behavior of these compounds in cancer cells, in order to future biomedical applications. Initially the magnetic nanoparticles were evaluated against the physical and chemical parameters that directly influence the final characteristics of product (pH, molarity, temperature and type of base) to observe the best synthesis conditions and influence of each characteristics. The nanoparticles were characterized by X-ray diffraction, sccaning electron microscopy, zeta potential and magnetometry. In this first study showed that coprecipitation produces particles with high polydispersity of sizes and that the synthesis parameters dramatically influence the properties of materials, however all samples exhibited magnetic characteristics. After you make this step, the MNP were subjected to transfection in cell culture of human cervical carcinoma (HeLa) and biological tests such as staining with Prussian blue and hematoxylin-eosin, MTT assay and apoptosis assay to investigate cytotoxicity. The main observation was that these results coming magnetic nanoparticles synthesized, except for some adjustments in short, constitute a class of nanocomposites with enormous potential for therapeutic and / or diagnosis. The work brings together information ranging from the synthesis of nanoparticles to their behavior inside the cells, emphasizing the best conditions for each procedure
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.unesp.br:11449/92023 |
| Date | 29 October 2011 |
| Creators | Souza, Aryane Tofanello de [UNESP] |
| Contributors | Universidade Estadual Paulista (UNESP), Nery, José Geraldo [UNESP] |
| Publisher | Universidade Estadual Paulista (UNESP) |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | 111 f. : il. |
| Source | Aleph, reponame:Repositório Institucional da UNESP, instname:Universidade Estadual Paulista, instacron:UNESP |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | -1, -1 |
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