Antibacterial Activity of Silver Nanoparticles Synthesized by Enterococcus Faecium Against Some Pathogenic Bacteria

Abstract

The biological technique is widely used for producing nanoparticles compared with other technique and it depends on using living organisms. Local Isolate of Enterococcus faecium was used in this study to synthesize silver nanoparticles. Silver nitrate (AgNO3) was used as precursor for biosynthesis of silver nanoparticles by Enterococcus faecium. the primary characterization of the synthesized nanosilver by Scanning Electron Microscopy, Transmission Electron Microscope, X-Ray Diffraction Dynamic Light Scattering Technique,and FT-IR Technique. The antimicrobial activity of synthesized nanosilver against Four local isolates : Staphylococcus epidermidis , Streptococcus mutans , Esherichia coli and Klebsiella pneumoniae , were estimated by using well diffusion method . The results showed that nanoparticles have a higher effect on Klebseilla pneumoniae as multi drug resistant bacteria compared to other isolates used in this study , and therefore nanoparticles can be a great prespective to resolve the growing rsistance antibiotics problematic .