By a News Reporter-Staff News Editor at Life Science Weekly -- Current study results on Essential Amino Acids have been published. According to news reporting originating in Santiago, Chile, by NewsRx journalists, research stated, "Raman and surface enhanced Raman scattering (SERS) spectroscopies were used to study the pH effect (7 to 9) on the interaction of arginine (Arg) with colloidal Ag nanoparticles (AgNps). A new methodology was implemented in order to obtain reproducible SERS spectra in solution."
The news reporters obtained a quote from the research from the University of Chile, "The dependence of the Arg concentration on the stability of the AgNps is discussed. A pH increasing of the colloidal solution to the limits of the Arg pKa(2) value induces a preferential and stable Arg-metal interaction. potential measurements of the Arg-AgNps system at different pH conditions studied provide information about the Arg-AgNps interaction; the pH increasing favors the interaction. SERS spectra at pH 7 indicate that the molecule interacts with the Ag surface only through the guanidinium fragment. By increasing the pH to 9, the molecule adopts a new conformation on the surface; the metal-analyte interaction is verified through the guanidinium, carboxylate and the aliphatic moieties."
According to the news reporters, the research concluded: "In addition, theoretical calculations performed by using the extended Huckel method for a model of Arg interacting with an Ag surface support the observed SERS results."
For more information on this research see: The effect of the pH on the interaction of L-arginine with colloidal silver nanoparticles. A Raman and SERS study. Journal of Raman Spectroscopy, 2013;44(8):1105-1110. Journal of Raman Spectroscopy can be contacted at: Wiley-Blackwell, 111 River St, Hoboken 07030-5774, NJ, USA. (Wiley-Blackwell - www.wiley.com/; Journal of Raman Spectroscopy - onlinelibrary.wiley.com/journal/10.1002/(ISSN)1097-4555)
Our news correspondents report that additional information may be obtained by contacting C. Garrido, University of Chile, Fac Sci, Dept. of Chem, Lab Vibrat Spect, Santiago, Chile. Additional authors for this research include T. Aguayo, E. Clavijo, J.S. Gomez-Jeria and M.M. Campos-Vallette (see also Essential Amino Acids).
Keywords for this news article include: Chile, Santiago, Arginine, Nanoparticle, South America, Nanotechnology, Basic Amino Acids, Diamino Amino Acids, Emerging Technologies, Essential Amino Acids
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