Abstract

ECHEVERRY-CHICA, Julián; NARANJO-DIAZ, Andrea  and  ARAQUE-MARIN, Pedronel. Silver nanoparticles functionalized in situ with D-Limonene: effect on antibacterial activity. Rev. ion [online]. 2020, vol.33, n.1, pp.79-92.  Epub June 26, 2020. ISSN 0120-100X.  https://doi.org/10.18273/revion.v33n1-2020008.

This study focused on the formulation and characterization of silver nanoparticles (AgNP) functionalized with d-limonene. The nanoparticles were functionalized by phase inversion and the synthesis of the nanoparticles was performed in situ; the particle size was determined by laser diffraction, zeta potential and colloidal optical stability using Multiscan 20 for a period of 24 hours at 37 °C; the minimum inhibitory concentration (MIC) and the minimum bactericidal concentration (CMB) of the formulated material on the bacterias Escherichia coli ATCC 25922, Staphylococcus aureus ATCC 29213, Klebsiella oxytoca ATCC 700324, Enterococcus casseliflavus ATCC 700327, Escherichia coli BLEE, Pseudomona aeruginosa resistant to carbapenems. The nanoparticles showed colloidal stability at a concentration of 3.93 % d-limonene, 1.6x10-3 % silver ions, 24 % non-ionic adjuvant and 5.88 % ascorbic acid, citric acid/citrate was used as a regulatory system (1:1) 0.48 M for a pH of 4.5. The formulation was classified as a polydispersed system (PD = 0.0851), with a zeta potential of -11.6 mV and average particle size of 81.5 ± 0.9 nm. A particle migration rate of -0.199 ± 0.006 mm h-1 was evidenced, a constant transmission profile, a backscatter profile with variations of 10 %, which represents a stable formulation. The nanoparticles presented an MIC and an MIB of 28 μg mL-1 (5.6x10-2 % limonene, 4.7x10-5 % AgNP) against all the bacteria tested.

Keywords : Silver Nanoparticles; Phase Inversion; Bacterial Resistance; Minimal Inhibitory Concentration.

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