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. 2023 Feb 11;257:124348. doi: 10.1016/j.talanta.2023.124348

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Fig. 6 — Differential pulse voltammograms for the detection of a (A) Negative serum sample and a (B) Positive serum sample (1.0 mmol L⁻¹ [Fe(CN)₆]^3-/4- in 0.1 mol L⁻¹ PBS, pH 7.4, step = 5 mV, amplitude = 0.15 V, modulation time = 0.5 s, and interval time = 1 s); (C) Signal variation for the detection of negative and positive serum samples.