Green Synthesis of Silver Nanoparticles and their Antibacterial Activity

Abstract

Silver nanoparticles have been prepared by the reduction of silver ions using respectively castor oil ( ricinus communis ), khat ( catha edulis ) and sun flower ( helianthus annuus ) leaf extracts as reducing and stabilizing agents. The as-synthesized material was characterized by using spectroscopic, XRD and TEM techniques. As-synthesized silver nanoparticles are found to have face centered cubic structure with average crystallite size 28 nm. and showed antimicrobial activity against Escherichia coli and Staphylococcus aureus .