Article Details : |
| | Article Name : | | Green Synthesis of Silver Nanoparticles Mediated by Aqueous Açaí (Euterpe Oleracea) Extracts | Author Name : | | Gabriele Simas Ribeiro, Ricardo Alexandre Alves de Couto, Analú Barros de Oliveira, Marina de Lima Fontes, Luiz Pereira da Costa, Hernane da Silva Barud, Fernanda Lourenção Brighenti, Vera Regina Leopoldo Constantino, Gustavo Frigi Perotti | Publisher : | | Bridge Center | Article URL : | | | Abstract : | | The production of metallic nanoparticles (MNPs) by green routes stands out for implementing concepts related to Green Chemistry in order to minimize impacts to the environment caused by traditional synthetic routes. The use of plant extracts to mediate the synthesis of MNPs is presented as an alternative since it contains phytochemicals that can participate in the formation and stabilization of nanoparticles (NPs). In this scenario, açaí, a fruit native to the Amazon region that contains biomolecules with antioxidant properties, exhibits the potential to mediate the synthesis of NPs. The present study investigated the production of silver nanoparticles (AgNPs) mediated by aqueous extracts of açaí, assessing different reaction parameters (açaí extract concentration, pH and temperature). The reaction media exhibited broad bands between 350-430 nm, which is associated with the surface plasmon resonance (SPR) of AgNPs, and were more visible when using diluted fruit extracts and in neutral/alkaline medium at the temperature of 25° C. Furthermore, AgNPs exhibited spheroidal shapes and hydrodynamic radius of 21.0 ± 0.8 nm (25°C); 9.0 ± 0.5 nm (40 °C) and 129.3 ± 5.6 nm (50 °C) and polydispersity indices (PdIs) of 0.283 ± 0.004 (25 °C), 0.452 ± 0.023 (40 °C) C) and 0.191 ± 0.017 (50 °C), with Zeta potential values close to -30 mV. The AgNPs showed lower cytotoxicity to fibroblasts than the AgNO3 solution, and did not exhibit microbiological activity, indicating a strong complexing capability of the phytochemicals present in the açaí extract. | Keywords : | | alternative synthetic routes; green chemistry; plant extract; Amazon fruits; microbicide; cytotoxicity. |
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