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Surface enhanced raman spectroscopy of amino acids and nucleotide bases adsorbed on silver


Journal of the American Chemical Society 108(16): 4711-4718
Surface enhanced raman spectroscopy of amino acids and nucleotide bases adsorbed on silver
The SERS spectra of amino acids (glycine, .alpha.- and .beta.-alanine, 6-aminocaproic acid, and o- and m-aminobenzoic acids (OABA and MABA)) and nucleic acid bases (adenine, cytosine, and uracil) adsorbed on the surface of silver colloid particles are reported. We interpret the SERS spectra of the aliphatic amino acids as indicating that both the amino and carboxylate groups are bound to the silver colloid surface. By analyzing the relative band intensities, we propose the geometry of each of the amino acids on the surface. The SERS spectra of OABA at high and low pH are very similar. In contrast the SERS spectra of MABA at high and low pH differ markedly, signaling a change of surface geometry for the molecule as a function of pH. Likewise the orientations of adenine, cytosine, and uracil on the surface of Ag colloid have been determined on the basis of their SERS spectra and the SERS spectra of the N-deuterated compounds.


Accession: 006546920



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