Antimicrobial activity of silver nanoparticles synthesized by using stem extract of <em>Svensonia hyderobadensis</em> (Walp.) Mold – A rare medicinal plant

Abstract

Biosynthesis of silver nanoparticles was carried out by using stem extract for the reduction of aqueous silver ions in short period. The silver nanoparticles formation was confirmed by the colour change of plant extracts (SNPs) and further confirmed with the help of UV-Vis spectroscopy. These phytosynthesized silver nanoparticles were tested for antibacterial and antifungal activities using disc diffusion method. The test cultures are Proteus, Pseudomonas, Klebsiella, Bacillus and E.coli species of bacteria  and Aspergillus, Fusarium, Curvularia and Rhizopus species of fungal were used. The microbial property of silver nanoparticles was analyzed by measuring the inhibition zone. The SNPs synthesized from stem extract of Svensonia hyderobadensis showed moderately toxic towards E. coli, Klebsiella, Bacillus and Proteus species and highly toxic to Pseudomonas. Whereas in the fungal species moderately toxic to Aspergillus flavus,  Aspergillus niger, urvularia and Fusarium and highly toxic to Rhizopus species. The results indicate that the biological synthesized silver nanoparticles may have an important advantage over conventional antibiotics.