413 Green Synthesis of Gold Nanoparticles

Friday, November 6, 2009: 11:40 AM
Santa Fe (Camino Real Hotel)
Milka O. Montes , Chemistry, University of Texas at El Paso, El Paso, TX
Jose R. Peralta-Videa , Chemistry, University of Texas at El Paso, El Paso, TX
Jorge L. Gardea-Torresdey , Chemistry, University of Texas at El Paso, El Paso, TX
Biological organisms are known to form gold nanoparticles when exposed to metal ions, and this is a relatively new area of nanotechnology research with a high potential for growth and development. It has also been shown that different plant biomasses produce nanoparticles of different shapes and sizes. In this work, secondary metabolites were extracted in liquid phase by hot water, isopropanol and methanol extractions from alfalfa biomass, and used as reducing agents for the synthesis of gold nanoparticles. Au(III) at concentrations in the range of 0.075 to 3 mM were tested for the synthesis of  gold nanoparticles respectively and the rate of formation was determined by UV-Vis spectrometry. Resulting colloids characterized by X-ray Diffraction and Electron Microscopy techniques, showed size and morphology dependence on the solvent used during extract preparation.