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Purpose : To synthesize silver nanoparticles (AgNPs) of Arbutus andrachne leaf  water extract (LE) and to evaluate the antimicrobial activity of both LE and AgNPs. Methods : The synthesized AgNPs were characterized using the following  techniques: ultraviolet-visible spectroscopy (UV-vis), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), thermal gravimetric analysis (TGA), X-ray diffraction (XRD) analysis, and analysis of particle size (PS) and zeta potential (ZP). The antimicrobial activities of LE and NPs were assessed by Kirby-Bauer disc diffusion (DD) and broth microdilution (MD) methods according to the recommendations of the Clinical and Laboratory Standards Institute (CLSI). LE and AgNPs were examined against fresh cultures of four Gram-positive and five Gram-negative bacteria, and three yeast strains. Results : AgNPs were successfully synthesized and characterized using Arbutus andrachne LE. The AgNPs showed moderate antibacterial activity against Staphylococcus aureus ATCC 6538p, S.epidermidis ATCC 12228, Escherichia coli ATCC 29998, Klebsiella pnemoniae ATCC 13883 and Pseudomonas aeruginosa ATCC 27853, and also antifungal activity against Candida albicans ATCC 10239 and C. krusei ATCC 6258. Conclusions : Due to the potent activity of AgNPs against Gram-positive and  Gram-negative bacteria, and yeast strains, it is suggested that AgNPs are potential broad spectrum antimicrobial agents. Keywords : Arbutus andrachne, Silver nanoparticles, Antimicrobial activity

Green synthesis of silver nanoparticles using <i>Arbutus andrachne</i> leaf extract and its antimicrobial activity