Antibacterial and antioxidant properties of biosynthesized silver nanoparticles using aqueous extract of Telfairia occidentalis leaves

K.O. odeinde, E.O Dare, E.O. Lasisi, A. Shonhai, S Makumire, N. Revaprasadu

Abstract


Green synthesis and characterisation of Ag nanoparticles was carried out via the bioreduction of silver salt using T. occidentalis aqueous extract as the reducing, capping and stabilizing agent. Antibacterial and antioxidant activities of biosynthesized Ag nanoparticles were tested against Escherichia coli by optical density measurement at 600 nm and nanoparticles concentration range of 0-100 µg/mL. UV-visible spectra showed narrow absorption peaks between 400-424 nm corresponding to the surface plasmon resonance (SPR) bands of Ag nanoparticles. Ag nanoparticles exhibited face centred cubic (fcc) crystalline phase. Transmission electron microscopic images revealed a uniform quasi-spherical morphology. Inhibition of E. coli growth in a concentration dependent manner was observed in the presence of silver nanoparticles. Ag nanoparticles displayed excellent1,1-diphenyl, 2-picrylhdrazylfree radical scavenging activities.

 Keywords: green synthesis, silver nanoparticles, antibacterial, antioxidant activities, T. occidentalis.


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Chemical Society of Nigeria