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    STUDIA PHYSICA - Issue no. 1 / 2001  
         
  Article:   VIBRATIONAL RAMAN STUDY OF FREE- AND ADSORBED TEMPYO LABELLED CYTOCHROME C ON SILVER COLLOIDAL SURFACE.

Authors:  S. CAVALU, SIMONA CINTĂ PÂNZARU, N. LEOPOLD, WOLFGANG KIEFER.
 
       
         
  Abstract:  Resonance Raman spectra of cytochrome c were recorded and compared to those of the tempyo labelled cytochrome c in the pH range from 6.7 to 11. In this pH range the resonance Raman spectra indicate a stable conformation of the cytochrome c heme group. Surface enhanced resonance Raman spectra (SERRS) of pure or labelled cytochrome c were interpreted in terms of structural changes of the tempyo labelled protein adsorbed on the silver colloidal surface. The enhancement of the bands assigned to porphyrin macrocycle stretching mode allowed the supposition of N-adsorbtion from porphyrin ring on to the colloidal surface. Tempyo label was found to be inactive in the resonance Raman or SERRS spectra of cytochrome c and was supposed to be attached within a distance from the heme group.  
         
     
         
         
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