Biosynthesis of nanoparticles is under exploration is due to wide biomedical applications and research
interest in nanotechnology. Bioreduction of silver nitrate (AgNO3) and chloroauric acid (HAuCl4) for the
synthesis of silver and gold nanoparticles respectively with the plant extract, Mentha piperita (Lamiaceae).
The plant extract ismixed with AgNO3 and HAuCl2, incubated and studied synthesis of nanoparticles using
UV–Vis spectroscopy. The nanoparticles were characterized by FTIR, SEM equipped with EDS. The silver
nanoparticles synthesized were generally found to be spherical in shape with 90 nm, whereas the synthesized
gold nanoparticles were found to be 150 nm. The results showed that the leaf extract of menthol is
very good bioreductant for the synthesis of silver and gold nanoparticles and synthesized nanoparticles
active against clinically isolated human pathogens, Staphylococcus aureus and Escherichia coli.