Abstract

BARRIENTOS, Katherina Changanaquí; IPARRAGUIRRE, Débora Alvarado  and  CAVERO, Hugo Alarcon. Synthesisandcharacterization of nanocompounds Fe₃O₄/Ag: its effect against Enterobacter aerogenes and Enterococcus faecaiis. Rev.Colomb.Quim. [online]. 2019, vol.48, n.2, pp.33-39.  Epub July 03, 2019. ISSN 0120-2804.  https://doi.org/10.15446/rev.colomb.quim.v48n2.73724.

In the present study, we report the synthesis and characterization of magnetite/silver magnetic nanoparticles (Fe3O4/Ag) and the study of their antibacterial properties against the bacteria Enterobacter aerogenes (Gramnegative) and Enterococcus faecaiis (Grampositive). Magnetite magnetic nanoparticles (MNPs) were prepared by a sol-gel method using cetyltrimethylammonium bromide (CTAB), as a surfactant, followed by in-situ chemical reduction of silver ions by glucose, and polyvinylpyrrolidone (PVP), as a dispersive agent, to obtain the antibacterial nanocomposite of Fe3O4/Ag. Morphological and spectroscopic studies of magnetite nanoparticles and nanocomposite were carried out using the Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, Mössbauer spectroscopy (MS), X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS). Spherical Fe3O4 MNPs showed an average diameter of 10 nm and the average size for nanocomposite was 28 nm. The antibacterial test indicated that the use of the nanocomposite of Fe3O4/Ag at a concentration of 5 mg'mL-1 allowed a total inhibition of the growth of the microorganisms studied from an initial concentration of 108 bacteria mL-1.

Keywords : Fe₃O₄/Ag nanocomposite; magnetic; sol - gel; antibacterial activity.

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