Plant-mediated synthesis of nanomaterials has been increasingly gaining popularity due to its eco-friendly nature and costeffectiveness.\nIn the present study, we synthesized silver (Ag) nanoparticles using aqueous extracts of fresh leaves of Impatiens\nbalsamina and Lantana camara medicinal plants as bioreducing agents. This method allowed the synthesis of nanoparticles, which\nwas confirmed by ultraviolet-visible (UV-Vis) spectrophotometry and transmission electron microscopy (TEM). UV-Vis spectra\nand visual observation showed that the color of the fresh leaf extracts of L. camara and I. balsamina turned into grayish brown and\nbrownish yellow, respectively, after treatment with Ag precursors. In addition, TEM analysis confirmed that AgNO3 solutions for\nall concentrations produced Ag nanoparticles and their average size was less than 24 nm. Moreover, aqueous leaf extracts of\nI. balsamina and L. camara were separately tested for their antimicrobial activity against Gram-positive Staphylococcus aureus and\nGram-negative Escherichia coli bacteria. The results showed that the bacterial growth was inhibited by the extracts containing Ag\nnanoparticles. Statistical calculation performed using the Tukey test showed that zones of inhibition for the two bacteria produced\nby the aqueous leaf extracts of L. camara containing 3mM and 5mM Ag precursors were not significantly different from that by\nciprofloxacin as positive control. On the contrary, there was significant difference between the zone of inhibition for E. coli by\nciprofloxacin and that by the extracts of I. balsamina leaves containing 3mM and 5mM Ag precursors. A similar result was\nobserved on the zone of inhibition for S. aureus by the extracts of I. balsamina leaves containing 3mMAg precursor. It was shown\nthat the aqueous extracts of fresh L. camara leaves containing Ag nanoparticles were comparable to ciprofloxacin in inhibiting\nbacterial growth.
Loading....