Abstract:
Synthesis of metallic nanoparticles using secondary metabolites present in plant extracts has attracted attention. In this
study, Lantana trifolia aqueous extracts were used to synthesize silver nanoparticles (AgNPs) which were then screened
for their antimicrobial activity. The morphology, size and functional groups present in AgNPs was evaluated using electron
microscopy and Fourier transform infrared spectroscopy (FT-IR). The role of temperature, reaction time and concentration
of precursor ion were evaluated by measuring the surface plasmon resonance of AgNPs using UV–Vis spectroscopy. The
crystal structure, hydrodynamic diameters and redox potential were evaluated using powder X-ray difractometer (PWXRD),
dynamic light scattering (DLS) and cyclic voltammetry respectively. The data obtained in this study revealed that increase
in the reaction time led to an increase in surface plasmon resonance of AgNPs while the increase in temperature from 20
to 35 ℃ increased the rate of AgNPs synthesis. The XRD difractogram revealed that the particles were composed of silver
with 2θ=38.36, 44.428, 54.89, and 57.87, corresponding to the silver crystal planes of (111), (200), (220), and (311). The
diameters of the nanoparticles were between 35 and 70 nm, and they had moderate antimicrobial activity against E. coli, P.
aeruginosa, C. albicans, S. aureus and B. subtilis
