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    STUDIA CHEMIA - Issue no. 3, Tom I / 2016  
         
  Article:   ELECTROCHEMICAL DETERMINATION OF DOPAMINE WITH GRAPHENE-MODIFIED GLASSY CARBON ELECTRODES.

Authors:  ÁRPÁD FERENC SZŐKE, GRAZIELLA LIANA TURDEAN, GABRIEL KATONA, LIANA MARIA MURESAN. 		 
       
         
  Abstract:   Two new glassy carbon modified electrodes were prepared by drop casting of chemically reduced graphene oxide (rGO) or graphene oxide (GO) on glassy carbon (GC) and then protected with a polymeric layer of Nafion or chitosan (Chit) (GC/Chit/rGO/Chit and GC/GO/Nafion). Their investigation by cyclic- and square-wave voltammetry for dopamine (DA) oxidation was aiming to estimate the analytical parameters that have the best values for GC/Chit/rGO/Chit electrode (i.e., the highest sensitivity of 1.002 ± 0.025 μA/ μM, a detection limit of 2.67 µM μM, for a linear domain from 4 to 18 µM DA). The modified GC/Chit/rGO/Chit electrode was also used for the detection of dopamine in injection vials using the standard addition method with a recovery of 99.42%.

Keywords: graphene oxide, reduced graphene oxide, dopamine, cyclic voltammetry, square wave voltammetry
 
         
     
         
         
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