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

Figure 4

Chronoamperograms obtained at FCDCNPE in 0.1 M PBS (pH 5.0) for different concentrations of CD. The numbers 1–8 correspond to 0.0, 0.3, 0.1, 0.45, 0.6, 0.75, 1.0, and 1.3 mM of CD. Insets: (a) plots of 𝐼 versus 𝑡^−1/2 obtained from chronoamperograms 2–8. (b) Plot of the slope of the straight lines against CD concentration and (c) FCDCNPE chronocolougrams in the absence (a) and presence of CD (b).