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Adathoda vasica - an Intelligent Fabricator of Gold Nanoparticles

Sunil Pandey, Goldie Oza, Golap Kalita, Madhuri Sharon

Leaf extract of Adathoda vasica a tropical shrub was used as reducing agent to convert gold ions into monodispersed gold nano particles. Parameters like pH, temperature, concentration of reactants viz. Gold salt and leaf extract was standardized to produce gold nano particles of 10 -20 nm size. The best parameters obtained were high temperature (80 and 100ºC), pH 6 and 50 ppm of aurochlorate. The characterization was based on observations made using UV-Vis spectroscopy, XRD and HRTEM. The reducing agents for synthesis of gold nano particles were speculated to be nitrate reductase and glutathione.