Preparation and Antibacterial Activity of Silver Nanoparticles Coated by Polyvinyl pyrrolidone)

摘要

A silver nanoparticle with good monodispersity was produced by a convenient method for the reduction of silver nitrate in the presence of poly( v inyl pyrrolidone) as the surface modification agent. Silver nanoparticle had little effect on the chemical structure of poly(vinyl pyrrolidone). Silver nanoparticle modified by polyvinyl pyrrolidone) with a nanosize of 5-10 nm had a face-centered cubic (FCC) line structure and silver nanoparticle could develop a spherical morphology. Pure polyvinyl pyrrolidone) have little antibacterial m bacteria and silver nanoparticle had perfect antibacterial activity with a wide antimicrobial spectrum against Gram-positive ia of Staphylococcus aureus and Gram-negative bacteria of Escherichia coli. The antibacterial activity could be enhanced as increase of the silver nanoparticles concentration no matter what on Staphyloccocus aureus or Escherichia coli. Antibacterial activity of silver nanoparticles on Staphylococcus aureus was better than on Escherichia coli.