• SIVAKALA S
• Dr.Suja S

Abstract: This paper describes a facile eco-friendly technique for the synthesis of silver nanoparticles(AgNPs) from aqueous solution of silver nitrate using flower extract of Catharanthus roseus in a single-pot process. Formation of stable AgNPs at different concentrations of AgNO3 gave mostly spherical particles with a diameter ranging from 5 to 40 nm. Here the aqueous extract contains Alpha-tomatine (α-tomatine) , a steroidal saponine as the major phyto chemical and which acts as structure directing agent for the formation of nano spheres of silver. It was observed that the use of makes a fast and convenient method for the synthesis of AgNPs and can reduce silver ions into silver nanoparticles within 2 min of reaction time without using any severe conditions. AgNPs was characterized by UV-visible spectroscopy, scanning electron microscopy( SEM), Transmission electron microscopy(TEM), Atomic force microscopy(AFM) and X-ray diffraction (XRD). The UV–vis spectra gave surface plasmon resonance for synthesized silver nanoparticles at 420 nm. The XRD analysis showed that the AgNPs are crystalline in nature and have face-centered cubic geometry. Further, the AgNPs showed an effective antibacterial activity toward S.aureous pathogen.

Biosynthesis, Silver nanoparticles, Antibacterial activity

"Facile Green Synthesis of Silver nano particles from catharanthus roseus flower extract for Antimicrobial Applications", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.7, Issue 4, page no.1577-1586, April-2020, Available :http://www.jetir.org/papers/JETIR2004414.pdf

"Facile Green Synthesis of Silver nano particles from catharanthus roseus flower extract for Antimicrobial Applications", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.7, Issue 4, page no. pp1577-1586, April-2020, Available at : http://www.jetir.org/papers/JETIR2004414.pdf