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Green synthesis, characteristics and antimicrobial activity of silver nanoparticles mediated by essential oils as reducing agents

2020; Elsevier BV; Volume: 28; Linguagem: Inglês

10.1016/j.bcab.2020.101746

1878-8181

Matheus Vinícius de Oliveira Brisola Maciel, Aline da Rosa Almeida, Michelle Heck Machado, Welman C. Elias, Cleonice Gonçalves da Rosa, Gerson Lopes Teixeira, Carolina Montanheiro Noronha, Fabiano Cleber Bertoldi, Michael Ramos Nunes, Rafael Dutra de Armas, Pedro Luiz Manique Barreto,

Moringa oleifera research and applications

This study presents a green synthesis of silver nanoparticles (AgNPs) using essential oils as an environmentally friendly alternative to the toxic chemical reducing agents. A trial screening was performed using the essential oils of oregano (Origanum vulgare), thyme (Thymus vulgaris), clove (Syzygium aromaticum L.), rosemary (Rosmarinus officinalis L.) and Poiretia latifolia. The best results regarding the formation of AgNPs (tested by UV–Vis spectrophotometry) were observed when using clove essential oil, which major compound eugenol (80%) was chosen for another synthesis as a control sample. Transmission Electron Microscopy and Dynamic Light Scattering demonstrated that AgNPs were predominantly spherical-shaped. Additionally, Small-Angle X-ray Scattering (SAXS) provided more accurate results, revealing a nanostructure with medium-sized particles between 18.6 nm (AgNP-Eugenol) and 22.4 nm (AgNP-Clove). The developed AgNPs presented antimicrobial activity against Staphylococcus aureus in different concentrations (40–100 μL mL−1), with a Minimum Inhibitory Concentration of 40 μL mL−1, thus considered bactericidal agents. This report showed that the AgNP-Clove present similar characteristics compared to AgNP-Eugenol, revealing the former as a cheaper and reliable alternative matrix to obtain silver nanoparticles, aiming at the future application of AgNPs in food packaging.