Bioprospecting AgNPs from Wild Desmodium Species (original) (raw)

Journal of Bionanoscience, 2009

Abstract

ABSTRACT Development of reliable and eco-friendly process for synthesis of metallic nanoparticles is an important step in the field of the application of nanotechnology. One of the options to achieve this objective is to use of biological systems. In this research we report extracellular biosynthesis of silver nanoparticles (AgNPs) exploiting the local biodiversity as an alternative to the chemical process. The plants of Desmodium species viz. Desmodium latifolium were selected. These plants occur as weeds in the gangetic river belt of Patna in Northern India. It was observed that the synthesis process was quite rapid and silver nanoparticles were formed within minutes of silver ion coming in contact with the plant filtrate. UV-visible spectrum of the aqueous medium containing silver ions demonstrated a peak at 425 nm corresponding to the plasmon absorbance of silver nanoparticles. Transmission electron microscopy (TEM) showed the formation of well-dispersed silver nanoparticles in the range of 5-30 nm. X-ray diffraction (XRD)-spectrum of the AgNPs exhibited 2θ values corresponding to the silver nanocrystal. FTIR analysis of the nanoparticles indicated the presence of proteins, which may be acting as capping agents around the nanoparticles. The process of reduction is extracellular and fast which may lead to the development of easy bio synthesis of silver nanoparticles.

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