Figure 8

(A) Chronoamperograms of 0.02 µM Vitamin D3 at CuO/Ag@lemon extract-GCE modified electrode; Inset view of chronoamperograms of 0.02 µM Vitamin D3 quick response in 3.4 s; (B) Chronoamperograms at different concentrations from 0.02 to 23 µM of Vitamin D3 employing CuO/Ag@lemon extract-GCE modified electrode sensor; (C) Relationship between concentration and faradaic current.