Abstract
The surface-enhanced Raman spectroscopy (SERS) of γ-aminobutyric acid (GABA) adsorbed on silver colloids in H2O and D2O were recorded and analyzed. When the concentration is greater than 10−3 M, the adsorbed species is the anionic form of the amino acid that interacts with the surface through both functional groups. According to the vibrational interpretation of the spectra, it is assumed that at concentrations in the order of or less than 10−3 M, GABA undergoes chemical transformations, which increase upon dilution, and spectra are recorded that are the result of the competitive adsorption between the amino acid in its anionic form and the products resulting from the chemical transformations. © 1997 John Wiley & Sons, Inc. Biospectroscopy 3: 449–455, 1997
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