Biosynthesis of nanosilver particles using extract of Salmonella typhirium

Development of reliable and eco-friendly processes for the synthesis of metallic nanoparticles is an important step in the field of application of nanotechnology. One of the options to achieve this objective is to use natural factories such as biological systems. In the present investigation, we report the biosynthesis of silver nanoparticles employing extract of Salmonella typhirium. Silver nanoparticles were synthesized through the reduction of aqueous Ag+ ion using the cell extract of bacterium Salmonella typhirium in the bright conditions. The synthetic process was fast and silver nanoparticles were formed within 30 min of silver ion coming in contact with the cell extract filtrate. UV-visible spectrum of the aqueous medium containing silver ion showed a peak at 415 nm corresponding to the plasmon absorbance of silver nanoparticles. The size of the nanoparticles was measured by dynamic light scattering (DLS) and the morphology of nanoparticles was observed using transmission electron microscopy (TEM).