Modified Carbon Nanotube Paste Electrode for Voltammetric Determination of Carbidopa, Folic Acid, and Tryptophan

Table 2

Comparison of the efficiency of some modified electrodes used in the electrocatalysis of LD.

Electrode	Modifier	Method	pH	Scan rate (mV/s)	Limit of detection (M)	Dynamic range (M)		Reference
Carbon paste	Ferrocene	Voltammetry	7.0	20	3.6×10^−6	5.0×10^−6	−6.0×10^−4	[30]
Carbon paste	2, 2′-[1,2-ethanediylbis (nitriloethylidyne)]-bis-hydroquinone	Voltammetry	7.0	30	7.2×10^−6	1.0×10^−5	−6.0×10^−4	[49]
Carbon paste	Ferrocene monocarboxylic acid	Voltammetry	7.0	10	2.9×10^−8	7.0×10^−8	−6.0×10^−4	[50]
Carbon Nanotube paste	Ferrocene dicarboxylic acid	Voltammetry	5.0	20	6.5×10^−8	1.0×10^−7	−7.5×10^−4	This work