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Previous issue date: 2015-07-20 / Nanopart?culas de prata, NPsAg t?m sido utilizadas no combate ? resist?ncia bacteriana. A abordagem de se associar um f?rmaco ao agente estabilizador ? completamente nova. ? uma t?nica na ?rea de nanomateriais a necessidade de se remover o agente estabilizador da superf?cie da part?cula porque o mesmo consome s?tios ativos para outras adsor??es. No entanto, no presente trabalho, mostraremos que a presen?a do agente estabilizante ? extremamente ben?fica, como observado nos resultados antimicrobianos. O objetivo deste trabalho foi combinar Hiclato de Doxiciclina ?s NPsAg e avaliar o efeito antimicrobiano. A Espectroscopia na regi?o do UV-Vis mostrou deslocamento batocr?mico na banda de absor??o das NPsAg livre para as NPsAg-HDOX evidenciando a poss?vel exist?ncia de esp?cie diferente das demais. A Espectroscopia de Fluoresc?ncia forneceu a informa??o que o HDOX atuava como um supressor da emiss?o das NPsAg, a partir desses dados determinou-se a rela??o de Stern-Volmer que indicou a presen?a de HDOX na esfera de a??o, ou seja, muito pr?ximo da part?cula. A Espectroscopia de Fluoresc?ncia Resolvida no Tempo evidenciou que o HDOX n?o interagiu com a superf?cie da part?cula. A Espectroscopia de Infravermelho por Reflect?ncia Atenuada Total, FTIR-ATR mostrou um deslocamento da banda de estiramento da carbonila de amida de 1680 cm-1 para 1672 cm-1, mostrando que h? uma intera??o entre o HDOX e as NPsAg estabilizadas pelo PVP. As curvas de Espalhamento de Raios-X em baixo ?ngulo, SAXS mostraram que nas primeiras 3 horas ap?s a adi??o do HDOX ?s NPsAg n?o houve desestabiliza??o das mesmas, j? a Microscopia Eletr?nica de Transmiss?o indicou que ap?s 72 horas as part?culas sofriam um aumento na distribui??o de tamanho. Fornecendo assim, uma base a respeito do envelhecimento do combinado. A avalia??o do efeito antimicrobiano foi realizado utilizando o M?todo de Difus?o (varia??o po?o). Os in?culos utilizados foram amostras padr?o de Escherichia coli e a Staphylococcus aureus. Os resultados indicaram que todos os combinados NPsAg-HDOX apresentaram efeito antimicrobiano. Entretanto o diferencial foi o efeito contra E. coli que foi maior do que para HDOX livre. / Silver nanoparticles, AgNPs have been used to combat bacterial resistance. The approach for associate the drug to stabilizing agent is completely new. It is focus area on nanometerials necessity of removing the particle stabilizing agent because it consumes other sites active for adsorption. However, in the present study shows that the presence of the stabilizing agent is extremely beneficial as observed in antimicrobial results. The goal was to combine Doxycycline hyclate to NPsAg and evaluate the antimicrobial effect. The spectroscopy in the UV-Vis region showed bathochromic shift in the absorption band of free NPsAg for NPsAg-HDOX indicating the possible existence of different species from the others. The Fluorescence Spectroscopy provided the information that the HDOX acted as a suppressor of issuing NPsAg, from these data we determined the Stern-Volmer relationship that indicated the presence of HDOX in the sphere of action, it is very close to the particle. The Spectroscopy in Time Resolved Fluorescence HDOX showed that has no interacted with the surface of the particle. The Spectroscopy Infrared Attenuated Total Reflectance, FTIR-ATR showed a shift of the amide carbonyl stretching band of 1680 cm-1to 1672 cm-1, showing that there is an interaction between the HDOX and NPsAg stabilized by PVP. The scattering curves in small angle x-ray scattering, SAXS showed that within the first 3 hours after addition of the HDOX NPsAg. In the other hand, Transmission Electron Microscopy indicated that after 72 hours the particles suffer na increase in distribution size. Thus providing a basis regarding the aging combined. The assessment of the antimicrobial effect was performed using the diffusion method. The inoculum used was standard strains of Escherichia coli. The results indicated that all NPsAg-HDOX combined had antimicrobial effect which was greater than the free HDOX (95% confidence level).
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/20435 |
| Date | 20 July 2015 |
| Creators | Silva, Heloiza Fernanda Oliveira da |
| Contributors | 21859095844, http://lattes.cnpq.br/2649423643904707, Fonseca, Jos? Luis Cardozo, 90623207753, http://lattes.cnpq.br/8143800826985556, Alves J?nior, Severino, 81408307472, http://lattes.cnpq.br/9563158536061549, Lima, Kassio Michell Gomes de, Gasparotto, Luiz Henrique da Silva, http://lattes.cnpq.br/6928918856031880 |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM QU?MICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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