In vitro evaluation of bactericidal effect of silver and gold-silver nanoparticles coated with silicon dioxide on Xanthomonas fragariae

MRS Advances ◽  
2017 ◽  
Vol 2 (49) ◽  
pp. 2683-2688
Author(s):  
Juana-Cristina Ibarra-Arán ◽  
Douglas Rodríguez-Martínez ◽  
Eugenio Rodríguez-González ◽  
Jesús-Roberto González-Castillo
Keyword(s):  
Gold Nanoparticles ◽  
Silver Nanoparticles ◽  
Surface Plasmon Resonance ◽  
Laser Ablation ◽  
Silicon Dioxide ◽  
Minimum Bactericidal Concentration ◽  
Bactericidal Effect ◽  
Gold Silver ◽  
Xanthomonas Fragariae

ABSTRACTIn this work it was evaluated the bactericidal effect of silver and silver-gold nanoparticles coated with silicon dioxide on Xanthomonas fragariae. Nanoparticles were synthesized by combining laser ablation and chemical synthesis techniques. Irradiating the samples at the same wavelength where nanoparticles exhibit its maximum absorbance is possible to photo induce the bactericidal effect by detonating the surface plasmon resonance. The results showed that the minimum bactericidal concentration (MBC) of silver nanoparticles was 16 μM (referred to [AgNO3]) and for silver-gold nanoparticles were 32 μM (referred to [AgNO3-HAuCl4]) at 60 minutes of irradiation.

scholarly journals Silver nanoparticles outperform gold nanoparticles in radiosensitizing U251 cells in vitro and in an intracranial mouse model of glioma

2016 ◽  
Vol Volume 11 ◽  
pp. 5003-5014 ◽  
Author(s):  
Pei Dang Liu ◽  
Haizhen Jin ◽  
Zhirui Guo ◽  
Jun Ma ◽  
Jing Zhao ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Silver Nanoparticles ◽  
Mouse Model ◽  
U251 Cells

EVALUATION OF THE BACTERICIDAL EFFECT OF NEBULIZED SILVER NANOPARTICLES ON COMMON RESPIRATORY BACTERIA IN HORSES– IN VITRO STUDIES

2021 ◽  
pp. 103635
Author(s):  
Thibault Frippiat ◽  
Charlotte Paindaveine ◽  
Jean-Noel Duprez ◽  
Catherine Delguste ◽  
Jacques Mainil ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Bactericidal Effect ◽  
In Vitro Studies

scholarly journals Effect of the magnetic field on the synthesis of colloidal silver and gold nanoparticles by laser ablation in bidestilated water

MOMENTO ◽  
2021 ◽  
pp. 1-11
Author(s):  
Miguel A. Valverde-Alva ◽  
Jhenry F. Agreda-Delgado ◽  
Juan A. Vega-González ◽  
Juan C. Rodríguez-Soto ◽  
Julio C. Idrogo-Córdova ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Gold Nanoparticles ◽  
Silver Nanoparticles ◽  
Laser Ablation ◽  
Zeta Potential ◽  
Inductively Coupled Plasma ◽  
Colloidal Silver ◽  
Colloidal Silver Nanoparticles ◽  
Percent Increase ◽  
The Magnetic Field

The effect of magnetic field of 0.3 T on the concentration, distribution of sizes in suspension and zeta potential of colloidal gold and colloidal silver nanoparticles, obtained by considering the pulsed laser ablation in double distilled water was studied. The magnetic field was transverse to the direction of incidence of the laser radiation and parallel to the surface of a submerged target. An Nd: YAG laser was used (1064 nm in wavelength, 10 ns in duration, repetition rate of 10 Hz and 37 mJ of energy) to ablate targets. The colloids were characterized by inductively coupled plasma optical emission spectroscopy, ultraviolet-visible spectroscopy, dynamic light scattering and zeta potential. Concentration analysis suggested that applying magnetic field of 0.3 T during nanoparticle synthesis leads to higher concentration. Applying magnetic field led to an eleven percent increase in the concentration of the colloid with gold nanoparticles and a five percent increase in the concentration of the colloidal silver nanoparticles. The absorption spectra suggested the presence of spherical nanoparticles. When analyzing the effect of the magnetic field on the hydrodynamic size distribution of the nanoparticles and the zeta potential of the colloids, no significant changes were evidenced. The magnetic confinement of the plasma induced by laser ablation caused changes in the characteristics of the colloids.

scholarly journals Silver nanoparticles as a medical device in healthcare settings: a five-step approach for candidate screening of coating agents

2018 ◽  
Vol 5 (1) ◽  
pp. 171113 ◽  
Author(s):  
Valentina Marassi ◽  
Luisana Di Cristo ◽  
Stephen G. J. Smith ◽  
Simona Ortelli ◽  
Magda Blosi ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Specific Activity ◽  
Bactericidal Effect ◽  
Ag Nps ◽  
Healthcare Settings ◽  
Coating Agents ◽  
Human Skin Models ◽  
Specific Contribution

Silver nanoparticle-based antimicrobials can promote a long lasting bactericidal effect without detrimental toxic side effects. However, there is not a clear and complete protocol to define and relate the properties of the particles (size, shape, surface charge, ionic content) with their specific activity. In this paper, we propose an effective multi-step approach for the identification of a ‘purpose-specific active applicability window’ to maximize the antimicrobial activity of medical devices containing silver nanoparticles (Ag NPs) (such as surface coaters), minimizing any consequent risk for human health (safety by design strategy). The antimicrobial activity and the cellular toxicity of four types of Ag NPs, differing in their coating composition and concentration have been quantified. Through the implementation of flow-field flow fractionation, Ag NPs have been characterized in terms of metal release, size and shape. The particles are fractionated in the process while being left unmodified, allowing for the identification of biological particle-specific contribution. Toxicity and inflammatory response in vitro have been assessed on human skin models, while antimicrobial activity has been monitored with both non-pathogenic and pathogenic Escherichia coli . The main benefit associated with such approach is the comprehensive assessment of the maximal effectiveness of candidate nanomaterials, while simultaneously indexing their properties against their safety.

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