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. Author manuscript; available in PMC: 2020 Jul 2.
Published in final edited form as: Anal Chem. 2019 Jun 13;91(13):8366–8373. doi: 10.1021/acs.analchem.9b01178

Fig. 1.

Fig. 1

Amperograms of PBS and histamine (HA) at GCE held at different constant potentials vs Ag/AgCl. (A) 0.9 V, (B) 1.1 V, and (C) 1.3 V. To a stirred solution of PBS pH 7.4, PBS was injected twice as a control, followed by two injections of 10 mM histamine to raise the concentration 50 μM in the whole solution.