Green synthesis of silver nanoparticles through reduction with Euphorbia nivulia Buch.-Ham., stem bark extract: Characterization and antimicrobial activity

Nanoparticles, because of their diversified applications in the field modern medicine, have gained a lot importance thrust area. In present investigation, synthesis and characterization Silver nanoparticles (AgNPs) antimicrobial effect on certain pathogenic bacteria were studied. AgNPs prepared by green process using stem extract Euphorbia nivulia, from 1 mM AgNO3 solution. The color change was observed after addition due to surface plasmon vibration. detailed carried out UV-Vis spectrometry at 400 700 nm; maximum absorption peak 432 nm. FTIR analysis showed functional groups involved formation. Scanning Electron Microscopy (SEM) revealed structure size spherical 20-90 nm respectively. activity screened for eight bacterial strains one fungal strain. highest inhibition (33.5±0.5) against Escherichia coli, followed Pseudomonas aeruginosa (30.5 ±0.5), Bacillus subtilis  (29 ±1) Salmonella typhimurium (28±1), cereus (27±1) Staphylococcus aureus (24.5 ±1.5)  Klebsiella pneumoniae (23.5 ±0.5) strain Candida albicans (26±1). Key words: bark, silver nanoparticles, characterization, activity.