Table 2. Cyclic voltammetric of binary mixture of NE and AA obtained for modified electrodes with constant concentration of NE (0.12 mM) and increasing concentration of AA.

Fabricated GC electrodes	Anodic peak potentials (mV)		Peak potential separation (V)
	AA	NE
MWCNT/Fe3O4/2,3-Nc	−0.01	0.215	0.205
MWCNT/Fe3O4/29H,31H-Pc	−0.026	0.208	0.182
MWCNT/ZnO/2,3-Nc	–	–	–
MWCNT/ZnO/29H,31H-Pc	0.078	0.307	0.229