Incorporação de nanopartículas de prata em Zamac 5 anodizado
Incorporation of silver nanoparticles in anodized Zamac 5
Ben-hur Riedi da Silva; Sandra Raquel Kunst; Luana Góes Soares; Tamires Lovato; Guilherme José Schneider; Débora Rech Volz; Ana Luiza Ziulkoski; Juliane Deise Fleck; Cláudia Trindade Oliveira
Resumo
O Zamac é uma liga de zinco, alumínio, magnésio e cobre, amplamente utilizada para produzir objetos de uso comum, como maçanetas, torneiras e corrimões. Esses objetos são potenciais mecanismos de transmissão de vírus e bactérias em locais com alto trânsito de pessoas. Nesse sentido, diversos estudos mostram que nanopartículas de prata (AgNPs) possuem espectro antimicrobiano, e podem inertizar agentes virais e bacterianos. Portanto, este trabalho trata da incorporação de nanopartículas de prata em amostras de Zamac 5, anodizadas e seladas. Para tanto, as amostras de Zamac 5 foram anodizadas em 0,3 M de ácido oxálico, e posteriormente seladas (por 15 e 30min) em extrato vegetal a base de Psidium guajava L. + 0,1 mM de nitrato de prata (AgNO3). As amostras foram analisadas quanto à morfologia e mapeamento químico por meio de Microscópio Eletrônico de Varredura (MEV). Além disso, foram realizados ensaios de crescimento bacteriano com Escherichia coli, Staphylococcus aureus e Pseudomonas aeruginosa nas amostras de Zamac 5. Os resultados mostraram que houve incorporação de prata (Ag) em formato de partículas e aglomerados de partículas, dispostas homogeneamente na superfície das amostras. Contudo, o aumento do tempo de selagem, em extrato vegetal contendo AgNO3, das amostras de Zamac 5 anodizadas, reduziu (30% em média) a formação do biofilme de Pseudomonas aeruginosa na análise do comportamento antimicrobiano.
Palavras-chave
Abstract
Zamak is a non-ferrous alloy, with considerable resistance to mechanical efforts. The alloy is widely used to produce objects in common use, such as door handles, faucets and handrails. These objects are potential transmission mechanisms for viruses and bacteria in places with high traffic of people. In this sense, several studies show that silver nanoparticles (AgNPs) have an antimicrobial spectrum. The objective of this work was to incorporate silver nanoparticles in Zamak 5 samples, anodized and sealed. Thus, the Zamak 5 samples were anodized in 0.3 M oxalic acid, and subsequently sealed in a plant extract based on Psidium guajava L. + 0.1 mM silver nitrate (AgNO3). Morphological analyzes and chemical mapping using Scanning Electron Microscope (SEM) were performed to evaluate the incorporation mechanisms. In addition, bacterial growth assays were performed with Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa. The results show that there was incorporation of silver (Ag) in the form of particles and agglomerates of particles, homogeneously arranged on the surface of the samples. However, it is concluded that the incorporation of silver element particles (Ag) in anodized Zamak 5, with the increase in the time of sealing the samples in plant extract, showed a reduction (30% on average) of the biofilm formed by Pseudomonas aeruginosa in the analysis of antimicrobial behavior.
Keywords
Referências
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Submetido em:
27/03/2023
Aceito em:
04/09/2023
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