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. Author manuscript; available in PMC: 2021 Jun 1.
Published in final edited form as: Anal Methods. 2019 Feb 19;11(12):1620–1630. doi: 10.1039/c8ay02737d

Figure 6. Adsorption Control Testing of the DOPAC waveform applied to Uncoated CFMEs.

Figure 6.

6A. Applying to the DOPAC waveform electrodes display a stability towards dopamine (1 μM) and DOPAC (5 μM) detection (peak oxidative current) for at least four hours. 6B. Scan rate. The peak oxidative current for dopamine (1 μM) and DOPAC (5 μM) cyclic voltammograms are linear with respect to scan rate ( 50 V/sec – 1,000 V/sec), thus denoting adsorption control to the surface of CFMEs when the DOPAC waveform is applied. Figure 6C. The peak oxidative currents for the cyclic voltammograms for dopamine and DOPAC are linear with respect to scan rate up from 500 nM to 10 μM. At higher concentrations, dopamine is saturated at the surface of the electrode, which blocks sites for further adsorption, hence the asymptotic curve. Figure 6D shows that both peak oxidative currents for both DOPAC and dopamine are linear at lower concentrations, up to 10 μM where the analytes are not yet saturated at the surface of the electrode.