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    STUDIA PHYSICA - Issue no. 1 / 2011  
         
  Article:   EPR STUDY OF MOLECULAR OXYGEN EFFECT UPON NITROXIDE RADICALS.

Authors:  CRISTINA BISCHIN, G. DAMIAN.
 
       
         
  Abstract:  In this paper, we have studied the effect of molecular oxygen from aqueous solution with different oxygen concentrations, on nitroxide radical Tempo (2, 2, 6, 6-tetramethyl-piperidine-1-oxyl) used in a free state and encapsulated on liposomes by EPR spectroscopy. The dependence of the EPR spectra on partial oxygen pressure, pO2 was obtained by measuring the line width as a function of pO2. It was found that EPR line width of the paramagnetic probe and oxygen concentration surrounding the probe is given by a linear relation.

Keywords: EPR spectroscopy, nitroxide radicals, oxymetry, liposomes, spin label.
 
         
     
         
         
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