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    STUDIA CHEMIA - Issue no. 2 / 2012  
         
  Article:   NADH OXIDATION AT MELDOLA BLUE MODIFIED GLASSY CARBON ELECTRODES. A COMPARATIVE STUDY.

Authors:  IONEL CĂTĂLIN POPESCU. 		 
       
         
  Abstract:  Three types of modified electrodes based on glassy carbon (powder and rod) and Meldola Blue (MB) were used for NADH electrocatalytic oxidation. MB was immobilized by simple adsorption on two different phosphates materials, crystalline zirconium phosphate (α-ZP) and crystalline titanium phosphate (α-TP), as well as on carbon aerogel (CA). The phosphate materials were incorporated in carbon paste, while CA was immobilized on a glassy carbon rod using a chitosan matrix. The basic electrochemistry of adsorbed MB and its ability to catalyze NADH electrooxidation have been investigated by cyclic voltammetry, performed in different experimental conditions (pH, potential scan rate, NADH concentration). The electroanalytical parameters of the investigated modified electrodes showed that: (i) irrespective the material, the formal standard potential of the immobilized MB was found pH dependent; (ii) the best electrocatalytic response was obtained for MB- αTP modified electrode.

Keywords: electrocatalysis, NADH electrooxidation, glassy carbon electrode, redox dyes 		 
         
     
         
         
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