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(A) Differential pulse voltammograms of DSNPs-GCE in 0.10 M phosphate buffer solution (pH 7.0) containing different concentrations of NA. The numbers 1–59 correspond to 1.4–833.3 μM of NA. Insets A, B, and C show the plots of the electrocatalytic peak current as a function of the NA concentration in the ranges of 833.3–166.7μM, 166.7–26.4μM, and 26.4–1.4μM, respectively. DSNPs-GCE = delphinidin silver nanoparticles modified glassy carbon electrode; NA = noradrenaline.
