TY - JOUR
T1 - Feasibility of Applying Fourier Transform Electrochemical Impedance Spectroscopy in Fast Cyclic Square Wave Voltammetry for theIn VivoMeasurement of Neurotransmitters
AU - Park, Cheonho
AU - Hwang, Sangmun
AU - Kang, Yumin
AU - Sim, Jeongeun
AU - Cho, Hyun U.
AU - Oh, Yoonbae
AU - Shin, Hojin
AU - Kim, Do Hyoung
AU - Blaha, Charles D.
AU - Bennet, Kevin E.
AU - Lee, Kendall H.
AU - Jang, Dong Pyo
N1 - Publisher Copyright:
© 2021 American Chemical Society
PY - 2021/12/7
Y1 - 2021/12/7
N2 - We previously reported on the use of fast cyclic square wave voltammetry (FCSWV) as a new voltammetric technique. Fourier transform electrochemical impedance spectroscopy (FTEIS) has recently been utilized to provide information that enables a detailed analytical description of an electrified interface. In this study, we report on attempts to combine FTEIS with FCSWV (FTEIS-FCSWV) and demonstrate the feasibility of FTEIS-FCSWV in thein vivodetection of neurotransmitters, thus giving a new type of electrochemical impedance information such as biofouling on the electrode surface. From FTEIS-FCSWV, three new equivalent circuit element voltammograms, consisting of charge-transfer resistance (Rct), solution-resistance (Rs), and double-layer capacitance (Cdl) voltammograms were constructed and investigated in the phasic changes in dopamine (DA) concentrations. As a result, allRct,Rs, andCdlvoltammograms showed different DA redox patterns and linear trends for the DA concentration (R2> 0.99). Furthermore, theRctvoltammogram in FTEIS-FCSWV showed lower limit of detection (21.6 ± 15.8 nM) than FSCV (35.8 ± 17.4 nM). FTEIS-FCSWV also showed significantly lower prediction errors than FSCV in selectivity evaluations of unknown mixtures of catecholamines. Finally,Cdlfrom FTEIS-FCSWV showed a significant relationship with fouling effect on the electrode surface by showing decreased DA sensitivity in both flow injection analysis experiment (r= 0.986) andin vivoexperiments. Overall, this study demonstrates the feasibility of FTEIS-FCSWV, which could offer a new type of neurochemical spectroscopic information concerning electrochemical monitoring of neurotransmitters in the brain, and the ability to estimate the degree of sensitivity loss caused by biofouling on the electrode surface.
AB - We previously reported on the use of fast cyclic square wave voltammetry (FCSWV) as a new voltammetric technique. Fourier transform electrochemical impedance spectroscopy (FTEIS) has recently been utilized to provide information that enables a detailed analytical description of an electrified interface. In this study, we report on attempts to combine FTEIS with FCSWV (FTEIS-FCSWV) and demonstrate the feasibility of FTEIS-FCSWV in thein vivodetection of neurotransmitters, thus giving a new type of electrochemical impedance information such as biofouling on the electrode surface. From FTEIS-FCSWV, three new equivalent circuit element voltammograms, consisting of charge-transfer resistance (Rct), solution-resistance (Rs), and double-layer capacitance (Cdl) voltammograms were constructed and investigated in the phasic changes in dopamine (DA) concentrations. As a result, allRct,Rs, andCdlvoltammograms showed different DA redox patterns and linear trends for the DA concentration (R2> 0.99). Furthermore, theRctvoltammogram in FTEIS-FCSWV showed lower limit of detection (21.6 ± 15.8 nM) than FSCV (35.8 ± 17.4 nM). FTEIS-FCSWV also showed significantly lower prediction errors than FSCV in selectivity evaluations of unknown mixtures of catecholamines. Finally,Cdlfrom FTEIS-FCSWV showed a significant relationship with fouling effect on the electrode surface by showing decreased DA sensitivity in both flow injection analysis experiment (r= 0.986) andin vivoexperiments. Overall, this study demonstrates the feasibility of FTEIS-FCSWV, which could offer a new type of neurochemical spectroscopic information concerning electrochemical monitoring of neurotransmitters in the brain, and the ability to estimate the degree of sensitivity loss caused by biofouling on the electrode surface.
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U2 - 10.1021/acs.analchem.1c02308
DO - 10.1021/acs.analchem.1c02308
M3 - Article
AN - SCOPUS:85120604280
SN - 0003-2700
VL - 93
SP - 15861
EP - 15869
JO - Analytical Chemistry
JF - Analytical Chemistry
IS - 48
ER -