Biosynthesis of Ag nanoparticles using Cynara cardunculus leaf extract: Evaluation of their antibacterial and electrochemical activity

Abstract

The present study reports the green synthesis of silver nanoparticles (AgNP’s) using Cynara cardunculus leaf extract in aqueous media. The silver ions reduction was carried out by the antioxidant component presents in the Cynara cardunculus. Transmission electron micrographs revealed that the synthesized AgNP’s exhibits semi-spherical morphology and the particle size was less than 45 nm. The energy dispersive X-ray analysis (EDS) spectrum revealed the presence of silver. Complementary, The AgNP’s solution exhibited an absorption peak at 435 nm, corresponding to surface plasmon resonance of AgNP’s. Fourier transform infrared (FT-IR) spectra showed the presence of the organic components responsible for reduction and stabilizing the nanoparticles. X-ray photoelectron spectroscopy (XPS) was employed to elucidate the chemical state and near surface composition of the AgNP’s obtained from Cynara cardunculus leaf extract. The antibacterial effect of the AgNP’s synthesized was tested by the disk diffusion method against E. Coli and S. Aureus bacteria. The electrochemical response of the nanoparticles was evaluated by cyclic voltammogram. The antibacterial and electrochemical activity of the AgNP’s were described in this work. Keywords: Silver nanoparticles, Green synthesis, Antibacterial activity, Electrochemical response