2009 Volume 7 Pages 314-318
We have investigated the reaction of L-cysteine in Rh(PVP) nanoparticle colloidal solution using S-K and Cl-K edges near edge X-ray absorption fine structure and circular dichroism measurements. In our previous study, it was shown using S-K edge NEXAFS technique that cystine molecules were synthesized by dissolving L-cysteine into the Rh(PVP) nanocolloidal solution. In this study, we have revealed the details of cystine synthesis reaction. There are four reactions, which are the adsorption of L-cysteine on Rh nanoparticle surface, the L-cysteine decomposition to cysteine thiolate, the formation of the complex structure similar to (NH4)3[RhCl6] and the synthesis of cystine molecule on Rh nanoparticle surface. These reactions start immediately after dissolving L-cysteine into the nanocolloidal solution. [DOI: 10.1380/ejssnt.2009.314]