Communication. Use of poly(L-lysine) and ascorbic acid for surface enhanced resonance Raman scattering analysis of acidic monoazo dyes
A surface enhanced resonance Raman scattering (SERRS) procedure is described for the analysis of acidic monoazo dyes. The SERRS spectra of these compounds can be obtained if a 0.01% solution of poly(L-lysine) is added to a citrate-reduced silver sol. Further enhancement of the SERRS intensities can be obtained by the addition of ascorbic acid. The discrimination between dyes offered by this procedure is demonstrated and a mechanism is proposed for the interaction between the poly(L-lysine), ascorbic acid and a dye.