Es. Forzani et al., AMPEROMETRIC DETERMINATION OF DOPAMINE ON AN ENZYMATICALLY MODIFIED CARBON-PASTE ELECTRODE, Journal of electroanalytical chemistry [1992], 382(1-2), 1995, pp. 33-40
The amperometric determination of dopamine under controlled convective
conditions on an enzymatically modified carbon paste electrode was st
udied using potato tissue as a source of polyphenol oxidase. Enzymatic
kinetic constants and substrate diffusional-resistance parameters wer
e determined and an analysis of the most common interferents was made.
It is concluded that the electrode is suitable for the quantification
of dopamine with a detection limit as low as 2.5 x 10(-6) M when the
hydrodynamic conditions are carefully controlled. The electrode is act
ive towards dopac, ascorbic acid and pyrocatechol but not L-tyrosine,
L-dopa, homovanillic acid, adrenaline, normetanephrine and vanilmandel
ic acid.