[Differential pulse-voltametric determination of dopamine using pretreated electrochemical electrodes].
The electroanalytical method proposed permits a sensitive and selective determination of dopamine in the presence of ascorbic acid applying a fast galvanostatic pretreatment of the carbon electrodes. The effect of the electrochemical pretreatment at glassy carbon electrode (A = 0.8 mm2) was compared with that of carbon fibre array electrode (A = 0.15 mm2). Both types of electrodes showed approximately the same detection limit for dopamine of about 1.10(-7) mol/l dopamine. In comparison to the polished electrodes the sensitivity is improved by a factor of 100. The galvanostatic pretreatment led also to a drastic improvement of selectivity by cathodic shift of the ascorbic acid peak potential.
Mattusch
J
J
Sektion Chemie, Karl-Marx-Universität Leipzig.
Werner
G
G
D002244:Carbon; D004298:Dopamine / Q000032:analysis*; D004563:Electrochemistry; D004566:Electrodes; D005898:Glass
D002244:Carbon; D004298:Dopamine
Differenzpuls-voltammetrische Bestimmung von Dopamin mit elektrochemisch vorbehandelten Elektroden.