Raman spectroscopy of L-tryptophan-containing peptides adsorbed on a silver surface

Surface-enhanced Raman spectra of L-tryptophanylglycine (L-Trp-Gly) and L-tryptophanylglycylglycine (L-Trp-Gly-Gly) adsorbed on a silver surface were obtained. More detailed investigations than in a previous study on the surface-enhanced Raman scattering from L-tryptophan (L-Trp) and glycyl-L-tryptophan (Gly-L-Trp) were also made. It was found that L-Trp and the above peptides adsorb on the silver surface via both the carboxylate (COO − ) and the amino (NH 2 ) groups. Interestingly, the nitrogen atom of the indole ring of L-Trp was found to bind to the surface only when L-Trp is the C-terminal residue

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