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We report on the use of plant extracts in the extracellular synthesis of pure metallic silver and gold nanoparticles. On treatment of aqueous solutions of AgNO3 and KAuCl4 with several leaf extracts (Pine, Persimmon, Ginkgo, etc.), stable silver and gold nanoparticles rapidly formed. UV-vis spectroscopy was used to monitor the quantitative formation of Ag and Au nanoparticles. All the synthesized metal nanoparticles were characterized with ICP, EDS and SEM. SEM analysis of Ag and Au particles indicated that they ranged in size from 20 to 50 nm. The reaction completed more than 90% within 1 hour. The rates of reduction of the metal ions are much faster than those reported in earlier studies using fungi or Neem leaf broth.1),2) This environment-friendly method of biological nanoparticle synthesis provides rates of synthesis comparable to
those of chemical methods and can potentially be used in various human body-contacting areas such as cosmetics, foods, medical and pharmaceutical applications.