The present work describes a simple and eco-friendly biosynthesis of silver nanoparticles using the fruits of Coriandrum sativum Linn [Family: Apiceae] and its determination of in vitro antioxidant activity. Methanol and aqueous extracts of dried fruits of C. sativum were prepared. The aqueous silver ions (1 mM, 2 mM and 3 mM) with heat and without heat when exposed to fruit extracts were reduced and resulted in silver nanoparticles whose size is in range of 50-200 nm. The silver nanoparticles were characterized by UV-Visible, Fourier transform infra-red spectroscopy (FT-IR) and scanning electron microscopy (SEM) with EDAX techniques. In vitro antioxidant activity was carried out using DPPH method with 3.125 to 100 μg/mL concentration of silver nanoparticles. Out of 3 different concentrations, 1 mM silver nitrate reduction was better using methanol and aqueous extract (0.2 mL). The in vitro antioxidant activity was found to show biphasic response and inhibitory activity was found between 100 to 25 μg/mL followed by stimulatory activity from 12.5 to 3.25 μg/mL which was not significant. It can be concluded silver nanoparticles synthesized by green synthesis using dried fruits of C. sativum possess antioxidant activity.

Keywords: Coriandrum sativum; Silver Nanoparticles; Dried Fruits; In Vitro Antioxidant Activity; DPPH Assay; Characterization of Nanoparticles;