Abstract
The report presents a unique phytosynthetic route for the synthesis of Au and Au/Ag alloy nanoparticles. Leaf essential oil of Coleus aromaticus has been used as the bioreductant for the present study. It is for the first time that an essential oil has been used for the synthesis of alloy nanoparticles. The synthesized nanoparticles have been characterized using UV–vis spectroscopy, Transmission Electron Microscopy, X-ray diffractometry and Fourier Transform Infrared Spectroscopy. The spectroscopic and microscopic techniques reveal the formation of fcc structured Au and Au/Ag alloy nanospheroids. The elemental composition has been confirmed through Energy Dispersive X-ray Spectroscopy. The catalytic efficiency of the as synthesized nanoparticles has been exhibited through the degradation of methyl red, methyl orange, eriochrome black T, eosin yellowish, rhodamine B and the isomers of nitro phenol. Agar well diffusion mode of antimicrobial study has been opted for, to evaluate the antibacterial efficacy of the biogenic Au/Ag nanoparticles against Gram negative Escherichia coli and the Gram positive Staphylococcus aureus. The bactericidal effect of the alloy nanoparticles has been observed to be prominent against E. coli with an inhibition zone of 28mm for a concentration of 150μL. The potential of the herbal deduced nanoparticles in scavenging the toxic superoxide, hydroxyl and nitric oxide radicals has been ascertained through in vitro antioxidant assays.
Published Version
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