Green Synthesis of Silver Nanoparticles and their Antimicrobial Activities

摘要

Silver nanoparticles were synthesized from two novel plant extracts, Salvia fruticosa and Adhatodavasica, using 1 mM AgNO3 solution as the precursor. The silver nanoparticles obtained exhibited typical plasmon absorption maxima of between 420 and 444 nm one hour after their biosynthesis. A size variation of between 36 and 110 nm was observed using TEM, with the average diameter of 73 nm recorded. Additionally, the XRD pattern, corresponding to planes (1 1 1), (2 0 0), (2 2 0) (3 1 1), revealed the crystalline nature of the biosynthesized nanoparticles. Their inhibitory effect against microorganisms was also examined using the pathogenic fungi Aspergillusflavus and Fusariumsolanias well as pathogenic gram positive (S. aureus & B. cereus) and gram-negative (E. coli & P. aeruginosa) bacteria; resulting in high anti-bactericidal activity against B. cereus and E. coli.