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- Title
Au@Ag Core@Shell Nanoparticles Synthesized with Rumex hymenosepalus as Antimicrobial Agent.
- Authors
Villalobos-Noriega, Jesús Mauro Adolfo; Rodríguez-León, Ericka; Rodríguez-Beas, César; Larios-Rodríguez, Eduardo; Plascencia-Jatomea, Maribel; Martínez-Higuera, Aarón; Acuña-Campa, Heriberto; García-Galaz, Alfonso; Mora-Monroy, Roberto; Alvarez-Cirerol, Francisco Javier; Rodríguez-Vázquez, Blanca Esthela; Carillo-Torres, Roberto Carlos; Iñiguez-Palomares, Ramón A.
- Abstract
In this work, we used a sequential method of synthesis for gold–silver bimetallic nanoparticles with core@shell structure (Au@AgNPs). Rumex hymenosepalus root extract (Rh), which presents high content in catechins and stilbenes, was used as reductor agent in nanoparticles synthesis. Size distribution obtained by Transmission Electron Microscopy (TEM) gives a mean diameter of 36 ± 11 nm for Au@AgNPs, 24 ± 4 nm for gold nanoparticles (AuNPs), and 13 ± 3 nm for silver nanoparticles (AgNPs). The geometrical shapes of NPs were principally quasi-spherical. The thickness of the silver shell over AuNPs is around 6 nm and covered by active biomolecules onto the surface. Nanoparticles characterization included high angle annular dark field images (HAADF) recorded with a scanning transmission electron microscope (STEM), Energy-Dispersive X-ray Spectroscopy (EDS), X-Ray Diffraction (XRD), UV–Vis Spectroscopy, Zeta Potential, and Dynamic Light Scattering (DLS). Fourier Transform Infrared Spectrometer (FTIR), and X-ray Photoelectron Spectroscopy (XPS) show that nanoparticles are stabilized by extract molecules. A growth kinetics study was performed using the Gompertz model for microorganisms exposed to nanomaterials. The results indicate that AgNPs and Au@AgNPs affect the lag phase and growth rate of Escherichia coli and Candida albicans in a dose-dependent manner, with a better response for Au@AgNPs
- Subjects
GOLD nanoparticles; RUMEX; NANOPARTICLES; FOURIER transform spectrometers; X-ray photoelectron spectroscopy; ANTI-infective agents; CANDIDA albicans
- Publication
Nanoscale Research Letters, 2021, Vol 16, Issue 1, p1
- ISSN
1931-7573
- Publication type
Article
- DOI
10.1186/s11671-021-03572-5