THE VOLTAMMETRIC BEHAVIOR OF DOPAMINE ON CARBON FIBER CYLINDER MICROELECTRODES MODIFIED WITH OVER-OXIDATED POLYPYRROLE FILMS

摘要

Dopamine((3, 4-dihydroxyphenyl)ethylamine, DA) is a important neurotrans-mitter in the mammalian central nervous system (CNS). Recently, investigations on the measurement of DA have attracted much attention. Ascorbic acid(AA) however , usually coexists together with DA in the mammalian body and their oxidative potential are very close. Therefore, the measurement of DA in vivo is always interfered with AA. In this paper, a new method is used to treat the poly pyrrole (PPy) film. The treated film tends to exclude the interference of big anions such as ascorbic acid but selectively response to big cations such as DA. The voltammetric behavior of the modified electrode is also studied.