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. 2021 May 12;21(10):3360. doi: 10.3390/s21103360

Figure 5.

Figure 5

(A): Differential pulse voltammograms of CPE in 0.1 M PB (pH = 8.0) and drug tablet (3.0 µM FA) containing different concentrations of pure FA: a–e corresponds to 0.0–4.0 µM of pure FA. (B): Differential pulse voltammograms of CPE in 0.1 M PB (pH = 8.0) and 0.2 mL of a urine sample containing a different concentration of FA: the letters a–d correspond to 0.0–9.0 µM of FA. (C,D): Standard addition curve of the peak current density J (µM cm−2) (extrapolated from respectively voltammograms A and B) vs. the concentration of FA [53].