Surface-enhanced Raman scattering (SERS) of aromatic amino acids and their glycyl dipeptides in silver sol

The surface-enhanced Raman (SER) spectra of aromatic amino acids (L-phenylalanine, L-tyrosine and tryptophan) and their glycyl dipeptides (glycyl-L-phenylalanine, glycyl-L-tyrosine and glycyl-L-tryptophan) adsorbed on Ag colloidal particles have been obtained. The surface-enhanced and ordinary Raman spectra show satisfactory correlations. The most prominent features in the SER spectra of all compounds are the strongly enhanced peaks at about 930 and 1390 cm−1 due to the CCOO− stretching and COO− symmetric stretching vibrational modes, respectively. This is interpreted as suggesting that the above compounds are adsorbed on the Ag surface through the carboxylate group. In the SER spectrum of glycyl-L-phenylalanine, the amide I and II bands are observed at about 1670 and 1520 cm−1, respectively.

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