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Antibacterial application of natural and carboxymethylated cashew gum-based silver nanoparticles produced by microwave-assisted synthesis

2019; Elsevier BV; Volume: 241; Linguagem: Inglês

10.1016/j.carbpol.2019.115260

1879-1344

Felipe Bastos Araruna, Taiane Maria de Oliveira, Patrick Veras Quelemes, Alyne Rodrigues de Araújo, Alexandra Plácido, Andreanne Gomes Vasconcelos, Regina C.M. de Paula, Ana Carolina Mafud, Miguel Peixoto de Almeida, Cristina Delerue‐Matos, Yvonne Primerano Mascarenhas, Peter Eaton, José Roberto de Souza de Almeida Leite, Durcilene Alves da Silva,

Ginkgo biloba and Cashew Applications

This study presents a green synthesis route to silver nanoparticles (AgNPs) stabilized with cashew gum (CG) or carboxymethylated cashew gum (CCG) using microwave-assisted synthesis and evaluates their antibacterial activity. The antimicrobial activity was measured by determining the minimum inhibitory concentration (MIC) with Staphylococcus aureus and Escherichia coli. In both cases of the presence of CG and CCG, it was found that higher pH lead to more efficient conversion of silver nitrate to AgNPs with well dispersed, spherical and stable particles as well as low crystallinity. CCG-capped AgNPs were slightly smaller (137.0 and 96.3 nm) than those coated with non-modified gum (144.7 and 100.9 nm). The samples presented promising antibacterial activity, especially on Gram-negative bacteria, resulting in significant membrane damage on treated bacteria in comparison to the untreated control, observed by atomic force microscopy. Thus, a quick and efficient synthesis route was applied to produce CGAgNPs and CCGAgNPs with antimicrobial potential.