Antimicrobial activity of silver and gold nanoparticles prepared by photoreduction process with leaves and fruit extracts of Plinia cauliflora and Punica granatum
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The increased number of resistant microbes generates a search for new antibiotic methods. Metallic nanoparticles have emerged as a new platform against several microorganisms. The nanoparticles can damage the bacteria membrane and DNA by oxidative stress. The photoreduction process is a clean and low-cost method for obtaining silver and gold nanoparticles. This work describes two original insights: (1) the use of extracts of leaves and fruits from a Brazilian plant Plinia cauliflora, compared with a well know plant Punica granatum, and (2) the use of phytochemicals as stabilizing agents in the photoreduction process. The prepared nanoparticles were characterized by UV-vis, FTIR, transmission electron microscopy, and Zeta potential. The antimicrobial activity of nanoparticles was obtained with Gram-negative and Gram-positive bacteria, particularly the pathogens Staphylococcus aureus ATCC 25923; Bacillus subtilis ATCC 6633; clinical isolates of methicillin-resistant Staphylococcus aureus (MRSA) and Enterococcus faecalis; Escherichia coli ATCC 25922; Escherichia coli O44:H18 EAEC042 (clinical isolate); Klebsiella pneumoniae ATCC 700603, Salmonella Thiphymurium ATCC 10231; Pseudomonas aeruginosa ATCC 27853; and Candida albicans ATCC 10231. Excellent synthesis results were obtained. The AgNPs exhibited antimicrobial activities against Gram-negative and Gram-positive bacteria and yeast (80–100%), better than AuNPs (0–87.92%), and may have the potential to be used as antimicrobial agents.
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FRANZOLIN, MARCIA R.; COURROL, DANIELLA dos S.; SILVA, FLAVIA R. de O.; COURROL, LILIA C. Antimicrobial activity of silver and gold nanoparticles prepared by photoreduction process with leaves and fruit extracts of Plinia cauliflora and Punica granatum. Molecules, v. 27, n. 20, p. 1-16, 2022. DOI: 10.3390/molecules27206860. Disponível em: http://repositorio.ipen.br/handle/123456789/33451. Acesso em: 20 Mar 2026.
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