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In India over more than 6,000 plants are used in traditional, folklore and herbal medicine. The Indian system of medicine has identified 1500 medicinal plants of which 500 are commonly used. Calendula officinalis, commonly known as marigold belongs to the family Compositae. Green synthesis of silver nanoparticles by herbal plants is presently under high exploitation. Our study deals with the synthesis of silver nanoparticles by using the flower extract of Calendula officinalis. The synthesis of silver nanoparticles occurred under the exposure of the flower extract to 1mM silver nitrate aqueous solution. During this process the complete reduction of was observed nearly 48 hours of reaction at 30 °C under vigorous shaking conditions. The colour change was noted in the reaction mixture and observed during the process of incubation period, it may be due to the formation of the silver nanoparticles which are able to produce the colour in the reaction mixture may be due to their specific properties of surface Plasmon resonance. The formation of silver nanoparticles is made confirmed by FT-IR, UV-Visible Spectroscopy. These showed that the particles were capped with the biomolecular compounds like terpenoids, aminoacids, proteins, alkaloids and some reducing agents etc from the contents of the flower extract of Calendula officinalis. However, future studies are needed to investigate the other hidden effects exhibited by the plant in order to make the plant as a proficient herbal drug therapy.

Efficacy of Green Synthesis of Silver Nanoparticles using Flowers of Calendula Officinalis