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

Figure 5

SWVs of FCDCNPE in 0.1 M PBS (pH 5.0) containing different concentrations of CD+FA+TRP in 𝜇M, from inner to outer: 0.2 + 14.0+ 12.0, 20.0 + 50.0 + 40.0, 40.0 + 150.0 + 125.0, 70.0 + 200.0 + 200.0, 150.0 + 500.0 + 400.0, 400.0 + 700.0 + 600.0, 550.0 + 800.0 + 700.0, and 750.0 + 1000.0 + 850.0, respectively. Insets (a), (b), (c), and (d) are plots of 𝐼_𝑝 versus CD, FA, and TRP concentrations, respectively.