The biosynthesis of silver nanoparticles (AgNPs) has been proved to be a cost effective and environmental friendly approach toward chemical and physical methods. In the present study, biosynthesis of AgNPs was carried out using aqueous extract of () husk. The initial colour change from golden yellow to orange was observed between 410 and 450 nm which confirmed the synthesis of AgNPs. Also, dynamic light scattering-particle size analysis confirmed the average size to be 113 nm and zeta potential value of -28 kV. The morphology of synthesised AgNPs displayed flower-shaped structure, X-ray diffraction pattern revealed the strongest peaks at 2 = 38.6° and 64° which proved that the nanoparticle has the face centred crystalline structure. The Fourier transform infrared spectroscopy results showed strong absorption bands at 1394.53, 2980.02 and 2980.02 cm due to the presence of alkynes, carboxylic acids, alcoholic and phenolic groups. The maximum zone of inhibition was observed against (22 mm) and (18 mm). The synthesised nanoparticles exhibited more free radical scavenging activity than the aqueous plant extract. This is the first report on the synthesis of AgNP from husk, delivers the efficient and stableAgNPs through simple feasible approach toward green biotechnology.

The present study intended to synthesize, characterize silver nanoparticles (AgNPs) using Cosmos sulphureus (Cs) aqueous leaf extract and their antimicrobial and antioxidant activities. The UV-vis spectrophotometer exhibited an absorbance peak around 430-440 nm with color intensity from yellow to reddish brown after 4 days. SEM and EDX analysis showed AgNPs were pure and polydispersed and the size were ranging from 55 to 80 nm. XRD revealed that the nanoparticles were cubic and face centered in shape and the biogenic CsAgNPs showed effective potent antimicrobial and antioxidant activities. This study may serve as a tool for analyzing the controlled release of synthesized AgNPs, which have prospective role in the field of disease management particularly with respect to resistant pathogenic microorganisms.