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Surface-enhanced Raman spectroscopy of γ-aminobutyric acid on silver colloid surfaces

✍ Scribed by J. L. Castro; S. Sanchez-Cortes; J. V. Garcia Ramos; J. C. Otero; J. I. Marcos

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
190 KB
Volume
3
Category
Article
ISSN
1075-4261

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✦ Synopsis

The surface-enhanced Raman spectroscopy ( SERS ) of g-aminobutyric acid ( GABA ) adsorbed on silver colloids in H 2 O and D 2 O were recorded and analyzed. When the concentration is greater than 10 03 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 03 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.

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