Part III: Surface-enhanced Raman scattering of amino acids and their homodipeptide monolayers deposited onto colloidal gold surface.
Surface-enhanced Raman scattering (SERS) spectra were measured for monolayers of various amino acids: L-methionine (Met), L-cysteine (Cys), L-glycine (Gly), L-leucine (Leu), L-phenylalanine (Phe), and L-proline (Pro) and their homodipeptides (Met-Met, Cys-Cys, Gly-Gly, Leu-Leu, Phe-Phe, and Pro-Pro) deposited onto a colloidal gold surface. Orientation of amino acids and their homodipeptides, as well as specific-competitive interactions of their functional groups with the gold surface, were predicted by detailed spectral analysis of the obtained SERS spectra. The analysis performed allowed us to propose a particular surface geometry for each amino acid and homodipeptide on the gold surface. In addition, we compared the structures of these molecules adsorbed on colloidal gold and silver surfaces.
Podstawka
Edyta
E
Laser Raman Laboratory, Regional Laboratory of Physicochemical Analysis and Structural Research, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland. podstawk@chemia.uj.edu.pl
Ozaki
Yukihiro
Y
Proniewicz
Leonard M
LM
D000596:Amino Acids / Q000032:analysis* / Q000737:chemistry; D020099:Coated Materials, Biocompatible / Q000032:analysis / Q000737:chemistry*; D004151:Dipeptides / Q000032:analysis / Q000737:chemistry*; D017979:Gold Colloid / Q000032:analysis / Q000737:chemistry*; D008027:Light; D010316:Particle Size; D011485:Protein Binding; D012542:Scattering, Radiation; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013499:Surface Properties
D000596:Amino Acids; D020099:Coated Materials, Biocompatible; D004151:Dipeptides; D017979:Gold Colloid