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    STUDIA CHEMIA - Ediţia nr.1 din 2010  
         
  Articol:   ANTIOXIDANT CAPACITY DETERMINATION BY THE BRIGGS-RAUSCHER OSCILLATING REACTION IN A FLOW SYSTEM. AN APPLICATION OF FUNCTIONAL DYNAMICS IN ANALYTICAL CHEMISTRY.

Autori:  NORBERT MUNTEAN, IOAN BÂLDEA, GABRIELLA SZABÓ, ZOLTÁN NOSZTICZIUS. 		 
       
         
  Rezumat:  A new method to determinate the antioxidant capacity by means of Briggs-Rauscher system under flow conditions is being described. The basis of this method is a continuous perturbation of an oscillating system performed in a continuously fed stirred tank reactor (CSTR) by an inlet flow of an antioxidant solution, namely resorcinol. Under proper experimental conditions the amplitude and the time period of the oscillations will be strongly affected by the concentration of the antioxidant inflow. In our experiments the amplitude and the frequency of the oscillations followed a supercritical Hopf bifurcation scenario where the resorcinol concentration plays the role of the bifurcation parameter. Switching between pure water and resorcinol solutions can be performed many times, applying standard solutions of the antioxidant or the analyte providing data for the calibration curve or for the actual measurement.

Keywords: Briggs-Rauscher oscillating reaction, inhibitory effect, CSTR, analytical method, resorcinol
  
         
     
         
         
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