A novel modified carbon nanotube paste electrode of 2-(4-
oxo-3-phenyl-3,4-dihydro-quinazolinyl)-N′-phenyl-hydrazinecarbothioamide
(2PHC) was fabricated, and the electrooxidation
of epinephrine (EP), norepinephrine (NE), and
their mixture has been studied using electrochemical
methods. The modified electrode displayed strong catalytic
function for the oxidation of EP and NE and resolved
the overlap voltammetric response of EP and NE into two
well-defined voltammetric peaks of about 240 mV with
square wave voltammetry (SWV). A linear response in the
range of (5 × 10-8)-(5.5 × 10-4)Mwith a detection limit
(S/N ) 3) of 9.4 nM for EP was obtained.
