Different Electrochemical Behavior of Cationic Dopamine from Anionic Ascorbic Acid and DOPAC at CNT Yarn Microelectrodes

Shao, Zijun; Venton, B. Jill

doi:10.1149/1945-7111/ac4d67

Title: Different Electrochemical Behavior of Cationic Dopamine from Anionic Ascorbic Acid and DOPAC at CNT Yarn Microelectrodes

Abstract

Carbon nanotube yarn microelectrodes (CNTYMEs) have micron-scale surface crevices that momentarily trap molecules. CNTYMEs improve selectivity among cationic catecholamines because secondary reactions are enhanced, but no anions have been studied. Here, we compared fast-scan cyclic voltammetry (FSCV) of dopamine and anionic interferents 3,4 dihydroxyphenylacetic acid (DOPAC) and L-ascorbic acid (AA) at CNTYMEs and carbon fiber microelectrodes (CFMEs). At CFMEs, dopamine current decreases with increasing FSCV repetition frequency at pH 7.4, whereas DOPAC and AA have increasing currents with increasing frequency, because of less repulsion at the negative holding potential. Both DOPAC and AA have side reactions after being oxidized, which are enhanced by trapping. At pH 4, the current increases for DOPAC and AA because they are not repelled. In addition, AA has a different oxidation pathway at pH 4, and an extra peak in the CV is enhanced by trapping effects at CNTYMEs. At pH 8.5, co-detection of dopamine in the presence of DOPAC and AA is enhanced at 100 Hz frequency because of differences in secondary peaks. Thus, the trapping effects at CNTYMEs affects anions differently than cations and secondary peaks can be used to identify dopamine in mixture of AA and DOPAC with FSCV.

Authors:

Shao, Zijun ^[1];

^[1]

University of Virginia, Charlottesville, VA (United States)

Publication Date:: Tue Feb 01 00:00:00 EST 2022

Research Org.:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); Owens Family Foundation; National Institutes of Health (NIH)

OSTI Identifier:: 1983009

Grant/Contract Number:: AC05-00OR22725; R01EB026497; R01MH085159

Resource Type:: Accepted Manuscript

Journal Name:: Journal of the Electrochemical Society

Additional Journal Information:: Journal Volume: 169; Journal Issue: 2; Journal ID: ISSN 0013-4651

Publisher:: IOP Publishing

Country of Publication:: United States

Language:: English

Subject:: 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Electrochemistry; Materials Science

Citation Formats


                    Shao, Zijun, and Venton, B. Jill. Different Electrochemical Behavior of Cationic Dopamine from Anionic Ascorbic Acid and DOPAC at CNT Yarn Microelectrodes.  United States: N. p., 2022. 
Web.  doi:10.1149/1945-7111/ac4d67.

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                    Shao, Zijun, & Venton, B. Jill. Different Electrochemical Behavior of Cationic Dopamine from Anionic Ascorbic Acid and DOPAC at CNT Yarn Microelectrodes.  United States.  https://doi.org/10.1149/1945-7111/ac4d67

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                    Shao, Zijun, and Venton, B. Jill. Tue .  
"Different Electrochemical Behavior of Cationic Dopamine from Anionic Ascorbic Acid and DOPAC at CNT Yarn Microelectrodes".  United States.  https://doi.org/10.1149/1945-7111/ac4d67.  https://www.osti.gov/servlets/purl/1983009.

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@article{osti_1983009,

  title        = {Different Electrochemical Behavior of Cationic Dopamine from Anionic Ascorbic Acid and DOPAC at CNT Yarn Microelectrodes},

  author       = {Shao, Zijun and Venton, B. Jill},

  abstractNote = {Carbon nanotube yarn microelectrodes (CNTYMEs) have micron-scale surface crevices that momentarily trap molecules. CNTYMEs improve selectivity among cationic catecholamines because secondary reactions are enhanced, but no anions have been studied. Here, we compared fast-scan cyclic voltammetry (FSCV) of dopamine and anionic interferents 3,4 dihydroxyphenylacetic acid (DOPAC) and L-ascorbic acid (AA) at CNTYMEs and carbon fiber microelectrodes (CFMEs). At CFMEs, dopamine current decreases with increasing FSCV repetition frequency at pH 7.4, whereas DOPAC and AA have increasing currents with increasing frequency, because of less repulsion at the negative holding potential. Both DOPAC and AA have side reactions after being oxidized, which are enhanced by trapping. At pH 4, the current increases for DOPAC and AA because they are not repelled. In addition, AA has a different oxidation pathway at pH 4, and an extra peak in the CV is enhanced by trapping effects at CNTYMEs. At pH 8.5, co-detection of dopamine in the presence of DOPAC and AA is enhanced at 100 Hz frequency because of differences in secondary peaks. Thus, the trapping effects at CNTYMEs affects anions differently than cations and secondary peaks can be used to identify dopamine in mixture of AA and DOPAC with FSCV.},

  doi          = {10.1149/1945-7111/ac4d67},

  journal      = {Journal of the Electrochemical Society},

  number       = 2,

  volume       = 169,

  place        = {United States},

  year         = {Tue Feb 01 00:00:00 EST 2022},

  month        = {Tue Feb 01 00:00:00 EST 2022}

}

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Title: Different Electrochemical Behavior of Cationic Dopamine from Anionic Ascorbic Acid and DOPAC at CNT Yarn Microelectrodes

Abstract

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Electrochemical sensors and biosensors for determination of catecholamine neurotransmitters: A review journal, November 2016

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Mechanism of L-ascorbic acid oxidation on a mercury electrode. II. Basic medium journal, June 1978

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Fast-scan voltammetry of biogenic amines
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Oxidation of L-ascorbic acid on a gold electrode
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Adsorption of catechols on fractured glassy carbon electrode surfaces
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Regulation of embryonic neurotransmitter and tyrosine hydroxylase protein levels by ascorbic acid
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Electrochemical sensors and biosensors for determination of catecholamine neurotransmitters: A review
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Mechanism of L-ascorbic acid oxidation and dehydro-L-ascorbic acid reduction on a mercury electrode. I. Acid medium
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