Published on April 2014 | Microbiology, Nanotechnology, Bacteriology, Seaweeds, Silver nanoparticles

Bio-synthesis of silver nano particles from marine alga Halymenia poryphyroides and its antibacterial efficacy

In this study biosynthesis of colloidal silver (Ag) nanoparticles from marine alga, Halymenia poryphyroides were studied against Gram-positive and Gram-negative bacteria. Green synthesis of silver nanoparticles that have environmentally acceptable solvent systems and eco-friendly reducing agents is of great importance. The efficacy was performed using Kirby Bauer Method and the extracellular mechanism of silver nanoparticle creation was characterized by UV-vis spectroscopy, Fourier Transform Infrared (FT-IR) spectroscopy, and X-ray Diffraction (XRD). Particle size distribution and morphology were investigated by Scanning Electron Microscope which showed silver nanoparticles in the size range of 34-80 nm. Fourier transform infrared spectroscopy revealed the possible involvement of reductive groups on the surfaces of silver nanoparticles. Silver nanoparticles showed greater efficacy towards Gram-positive and Gram-negative bacteria compared to the standard antibiotics.