Electrogenerated chemiluminescence determination of dopamine and epinephrine in the presence of ascorbic acid at carbon nanotube/nafion-Ru(bpy)2+3 composite film modified glassy carbon electrode

Based on the inhibition effect of dopamine and epinephrine on Ru(bpy)(2+)(3)-tripropylamine electrogenerated chemiluminescence system, the excellent properties of carbon nanotube, and the cation permselectivity of Nafion film. an electrogenerated chemiluminescence inhibition method for determination of dopamine and epinephrine in the presence of ascorbic acid at carbon nanotube/Nafion-Ru(bpy)(2+)(3) composite film modified glassy carbon electrode was described. The results showed that the proposed method was sensitive and selective for the determination of dopamine and epinephine. The linear calibration range was from 1.6 x 10(-9) M to 3.2 x 10(-5) M and 5 x 10(-8) M to 6 x 10(-5) M for dopamine and epinephrine, respectively. 200-fold excess of ascorbic acid did not interfere with the determination of 1 mu M dopamine and epinephrine.