Silver adenosine 5 -phosphate

Fig. 10. SERS spectra of poly-A and its building stones adenine, adenosine 5 -monophosphate and ribose 5-phosphate. Freshly prepared silver colloids, pH 4.5 4 x 10 M adenine, 5 -AMP or ribose 5-phosphate added poly-A concentration 1.6mg/ml Laser excitation line 514nm, laser power 200 mW. (The drawing of poly-A in d shows the adenine base and the sugar-phosphate backbone outside the molecule)...

Figure 14a shows an example of the SERS spectrum of 5 -AMP and its building stones adenine (Fig. 14c) and adenosine (Fig. 14b) adsorbed at a positively charged silver electrode in the spectral range of 100 to 1700 cm". The most characteristic internal band systems of the 5 -AMP spectrum are located at 730 and 1340 wave-numbers. They exhibit a significantly enhanced intensity. Moreover, one intense band is observed at 240 cm " This band has been assigned to the interfacial vibration of the phosphate group with the positive silver surface —POf /Ag (cf. Fig. 14d). The...

---