The Antibiotic Resistance Pattern of Methicillin Resistant Staphylococcus aureus and Antibacterial Effect of Silver and Copper Nanoparticles on that In vitro and Animal model

Subject Areas :

Saba  Hashemi ¹ (Biology Research Center, Zanjan Branch, Islamic Azad University Zanjan, Iran.)
Rasoul  Shokri ² (Biology Research Center, Zanjan Branch, Islamic Azad University Zanjan, Iran)

Received: 2022-10-10 Accepted : 2023-11-23 Published : 2022-12-22

Keywords:

Abstract :

Background & aim: Considering the high resistance to drug in methicillin-resistant Staphylococcus aureus, this study was performed to investigate the effects of silver and copper nanoparticles and their combined effect on the methicillin-resistant Staphylococcus aureus in vitro and animal models.Materials & Methods: To determine the most effective antibiotics, disk diffusion method was performed. The microdilution method is used for determination of Minimum Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC) of copper and silver nanoparticles and their combination . Then, to examine the effect of nanoparticles and the antibiotic, experiments were performed in the animal models. For this purpose, after intraperitoneal inoculation of bacterial suspension, MBC concertrations obtained from microdilution method were injected to the mice and after the cultivation of spleen, colony count was performed.Results: The most effective antibiotic on bacteria was vancomycin. The MIC of silver and copper nanoparticles, vancomycin, silver and copper nanoparticles, silver nanoparticles-vancomycin and copper nanoparticles- vancomycin were 1250 ppm, 2500 ppm, 78/12, 625 ppm, 35 ppm and 250 ppm respectively. In animal model, the lowest number of colonies is related to silver nanoparticles and then silver nanoparticles-vancomycin.Conclusion: The results show that antimicrobial effect of silver nanoparticles is more than vancomycin and copper nanoparticles. Also the combination of silver and copper nanoparticles increases their antimicrobial strength and the combination of silver and vancomycin after complementary experiments, can be a option for the treatment of infections caused by these bacteria.

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