Abstract

The study highlights the fabrication of gold nanoparticles (GNPs) by fresh leaves of Tridax procumbens (TP), an herbal medicinal plant. The bio-reduction of auric chloride ion (Au+3) is quite rapid, readily to be performed at room temperature. This study describes a rapid and eco-friendly synthesis of TP-GNPs are be done using TP leaf extract in a single pot process and is observed when the medium turns into purple color with the addition of aqueous Au+3. The formation of TP-GNPs is verified by ultraviolet-visible spectroscopy. The possible functional groups of TP leaf extract and their changes after treating with aqueous auric chloride are evaluated by Fourier transform infrared spectroscopy. The size of synthesized TP-GNPs is measured by dynamic light scattering analysis, and morphology is examined by transmission electron microscopy in nano range and energy dispersive X-ray spectrum confirming the presence of gold. The average size of TP-GNPs is ~7 nm and monodispersed. Further, we apply anti-bacterial activity on both Escherichia coli and Bacillus subtilis, and the results suggest that the TP-GNPs suspension exhibits anti-bacterial activity.