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• W2004254818 abstract "The electrochemistry of dopamine (3-hydroxytyramine) was studied by cyclic voltammetry at a glassy carbon electrode in the presence of cetyltrimethylammonium bromide (CTAB) and sodium dodecyl sulfate (SDS) micelles at different pH. The anodic peak potential (Epa) and peak current (Ipa) were found to be remarkably dependent on the charge and the concentration of the surfactant. The Epa and Ipa change abruptly around the critical micellar concentration (CMC) of the surfactants and reach a plateau above the CMC. The Epa at the plateau shifts to more positive values in the cationic CTAB micellar solution, e.g. from 180 mV vs SCE in aqueous solution at pH 6.8 to 410 mV in CTAB micelle, whilst it shifts to less positive values in the anionic SDS micellar solution, e.g. 150 mV at pH 6.8. Therefore, the overlapped anodic peaks of dopamine and ascorbic acid in the mixture of the two compounds in aqueous solutions can be separated in CTAB micelles since the micelle shifts the Epa of ascorbic acid to less positive values. The two peaks are separated by ca. 400 mV at pH 6.8 in CTAB micelle, hence dopamine can be determined in the presence of 100 times excess of ascorbic acid. In SDS micelle and in the presence of ascorbic acid, the Ipa of dopamine is greatly enhanced due to the catalytic oxidation of the latter that enables quantitative determination of both compounds." @default.
• W2004254818 created "2016-06-24" @default.
• W2004254818 creator A5048385740 @default.
• W2004254818 date "1999-12-01" @default.
• W2004254818 modified "2023-09-23" @default.
• W2004254818 title "Micellar effects on the electrochemistry of dopamine and its selective detection in the presence of ascorbic acid" @default.
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• W2004254818 doi "https://doi.org/10.1016/s0039-9140(99)00207-6" @default.
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