Green biosynthesis of silver nanoparticles by Spirulina platensis

Crystallized silver nanoparticles (snps) have been biosynthesized by spirulina platensis in anaqueous system. an aqueous solution of silver ions was treated with a live biomass of spirulina platensisfor the formation of snps. these nanoparticles showed an absorption peak at 430 nm in the uv-visiblespectrum, corresponding to the plasmon resonance of snps. the transmission electron micrographs ofnanoparticles in an aqueous solution showed the production of snps (average size of most particles:12 nm) by spirulina platensis. the x-ray diffraction (xrd) spectrum of the nanoparticles confirmed theformation of metallic silver, and the average size of the crystallite was estimated from the peak profile bythe scherrer method. the synthesized snps had an average size of 11.6 nm.