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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. 2.

Fig. 2

(A) Background-subtracted cyclic voltammogram of 50 mM histamine in PBS pH 7.4 at GCE. Scan rate 50 mV/s. (B) Cyclic voltammogram of 1 mM [Fe(CN)6]3– in 1 M KCl at GCE performed (i) at a fresh electrode, (ii) after GCE was scanned in 50 mM histamine from −0.5 to +1.5 V, (iii) electrode polished after (ii), and (iv) after electrode scanned in 50 mM histamine from −0.5 to +1.0 V. Scan rate 100 mV/s. Polymerization of histamine at waveform to 1.5 V prevents histamine detection, but electrode can be regenerated by polishing. Scanning to 1.0 V does not produce polymerization or fouling. (C) Cyclic voltammogram of 50 mM histamine in phosphate buffer at different pH. Inset illustrates the pH-dependence of anodic peak potential. Scan rate 50 mV/s.