Green synthesis and characterization of Silver nanoparticles using the flower extracts of Tecoma stans (L.) Juss.ex Kunth (Yellowtrumpet bush) and Tagetes erecta L. (African marigold)
Sonamol Babu, Aleena Elsa Mani and Nisha P. Aravind*
Post Graduate and Research Department of Zoology, CMS College (Autonomous), Kottayam-686001 (India) *Email ID: nishaparavind@cmscollege.ac.in.
ABSTRACT
The Nanoparticle is defined as a particle of matter between 1 and 100 nanometers in diameter. High quality colloidal silver nanoparticles were synthesised via a green approach by using the flower extracts of Tecoma stans and Tagetes erecta. Silver nitrate was used as a substrate ion while the plant extract successfully played the role of reducing and stabilising agents. The bio-reduction of aqueous Ag+ ions by Tecoma stans and Tagetes erecta extracts were identified by its colour change. During the synthesis of silver nanoparticle, the colour of the solution changed from yellowish-brown to dark brown indicating the formation of silver nanoparticles. The synthesised nanoparticles were characterised by Fourier Transform Infrared Spectroscopy and UV-vis Spectroscopy. The peak obtained at 450 nm confirmed the presence of synthesised silver nanoparticles. The antibacterial activity of the synthesised nanoparticles was studied on Escherichia coli, Staphylococcus aureus and Streptococcus pyogenes using disk diffusion method. The recent approach of green synthesis is quite impressive due to its eco-friendly, economical, feasible and non-toxic nature.