Micellar effects on the electrochemical oxidation of norepinephrine and its determination in the presence of ascorbic acid

The electrochemistry of norepinephrine has been studied by cyclic voltammetry at glassy carbon electrode in the presence of cetyltrimethylammonium bromide and sodium dodecyl sulfate micelles at different pHs. The anodic peak potential and peak current are found to be dependent on the charge and the concentration of the surfactants. The anodic peak potential and peak current change abruptly around the CMC of the surfactants and reach a plateau above the CMC. The anodic peak potential shifts to more positive values in CTAB and to more negative values in SDS. The electrocatalylic oxidation of norepinephrine in the presence of ascorbic acid in SDS micellar solution enables a sensitive determination of norepinephrine in the presence of ascorbic acid.