Resumen

JIMENEZ MEJIA, Rafael; RAMIREZ HERRERA, Ángel Daniel; OROZCO CEJA, Jesús Alejandro  y  GONZALEZ DOMINGUEZ, Martha I.. Biosynthesis of silver nanoparticles with antimicrobial activity by environmental Pseudomonas aeruginosa. Mundo nano [online]. 2024, vol.17, n.32, e00084.  Epub 01-Abr-2024. ISSN 2448-5691.  https://doi.org/10.22201/ceiich.24485691e.2024.32.69721.

Silver nanoparticles (NPs-Ag) are of great interest due to the potential applications in different areas. In order to find methodologies that not represent human health risk and also an ecofriendly one, biosynthesis of these nanoparticles has been a viable option. It is known that diverse biomolecules present in microorganisms can function as an oxidative, reductor and/or stabilizer agents, thanks to that silver nanoparticles synthesis could be favored. In this work the main objectives were the biosynthesis, characterization, and evaluation of antibacterial activity of NPs-Ag. Biosynthesis was made using the culture supernatant of Pseudomonas aeruginosa. The NPs-Ag were characterized using UV-Vis spectroscopy, scanning electron microscopy, X‑ray diffraction and the antimicrobial effect was evaluated by dilution assays in Muller Hinton broth and the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were determined against Gram-positive and Gram-negative bacteria. A mixture containing 20% of supernatant and 3 mM AgNO3 was the best way to obtain silver nanoparticles. Nanoparticles with mixed morphology were observed. The NPs-Ag showed antibacterial activity over Gram-positive and Gram-negative bacteria with MIC of 1 to 2 µg/ml and MBC of 2 to 4 µg/ml. In conclusion, culture supernatant of P. aeruginosa is a viable pathway for the synthesis of NPs-Ag with antibacterial activity.

Palabras llave : Pseudomonas aeruginosa; biosynthesis; nanoparticles; antibacterial activity; Gram positives; Gram negatives.

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