H. Zhao et al., Electrochemical determination of dopamine using a poly(2-picolinic acid) modified glassy carbon electrode, ANALYST, 126(3), 2001, pp. 358-360
A poly(2-picolinic acid) chemically modified electrode (CME) for the determ
ination of dopamine (DA) by cyclic voltammetry is described. Compared with
a bare glassy carbon electrode, the CME exhibits a 200 mV shift of the oxid
ation potential of DA in the cathodic direction and a marked enhancement of
the current response. In pH 7.0 buffer solution, a linear calibration grap
h is obtained over the range from 2.5 x 10(-7) to 1.0 x 10(-5) mol dm(-3) w
ith a correlation coefficient of 0.998. The detection limit is 3.0 x 10(-8)
mol dm(-3). The modified electrode eliminated efficiently the interference
from ascorbic acid (AA) when present in a 150-fold concentration ratio. It
also showed excellent stability and reproducibility.