Catalysis of slow charge transfer reactions at polypyrrole-coated glassy carbon electrodes

Saraceno, Reginaldo A.; Pack, Judith G.; Ewing, Andrew G.

doi:10.1016/0022-0728(86)80154-1

Cited by 119 publications

(28 citation statements)

References 44 publications

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“…The cationic sites on the PEDOT film leads to accumulation of ascorbate anions at the interface. This is corroborated by an earlier finding that metal like electrodes with fixed cationic sites can enhance the oxidation rates of anion when compared to bare electrode, by means of electrostatic attraction [27].…”

Section: Cyclic Voltammetrysupporting

confidence: 84%

Determination of Uric Acid in the Presence of Ascorbic Acid Using Poly(3,4-ethylenedioxythiophene)-Modified Electrodes

Mathiyarasu

Phani

et al. 2005

Electroanalysis

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A poly(3,4-ethylenedioxythiophene) (PEDOT) modified glassy carbon electrode (GCE) was used to determine uric acid in the presence of ascorbic acid at physiological pH facilitating a peak potential separation of ascorbic acid and uric acid oxidation (ca. 365 mV), which is the largest value reported so far in the literature. Also, an analytical protocol involving differential pulse voltammetry has been developed using a microchip electrode for the determination of uric acid in the concentration range of 1 to 20 mM in presence of excess of ascorbic acid.

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Section: Cyclic Voltammetrysupporting

confidence: 84%

Determination of Uric Acid in the Presence of Ascorbic Acid Using Poly(3,4-ethylenedioxythiophene)-Modified Electrodes

Mathiyarasu

Phani

et al. 2005

Electroanalysis

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“…The oxidation of AA at conventional bare electrodes is generally believed to be totally irreversible due to rapid hydration of the oxidized product [38]. At the bare BDD electrode the oxidation of AA occurs at 0.48 V (vs. Ag j AgCl j KCl sat ) and the electron transfer kinetics was found to be sluggish as can be seen from the standard redox potential of AA (0.073 V vs. Ag j AgCl) [39].…”

Section: Electrochemical Oxidation Of Aa Da and Dopacmentioning

confidence: 96%

Selective Detection of Dopamine and Its Metabolite, DOPAC, in the Presence of Ascorbic Acid Using Diamond Electrode Modified by the Polymer Film

et al. 2004

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The surface of boron-doped diamond (BDD) electrode is modified by the polymer film for the first time. The cationic polymer film of N,N-dimethylaniline (DMA) is electrochemically deposited on BDD electrode surface. This polymer (PDMA) film-coated BDD electrode is used as a sensor which selectively detect dopamine (DA) in the presence of ascorbic acid (AA). This electrode also can detect both DA and its metabolite, 3,4-dihydroxy phenyl acetic acid (DOPAC) in the presence of AA in the range of the physiological concentrations of these species. Favorable ionic interaction (i.e., electrostatic attraction) between the PDMA film and AA or DOPAC lowers their oxidation potentials and enhances the current response for AA and DOPAC compared to that at the bare electrode. The PDMA film also shows a hydrophobic interaction with DA and DOPAC. In cyclic voltammetric measurements, the PDMA film-coated electrode can successfully separate the oxidation potentials for AA and DA coexisting in the same solution and the separation is about 200 mV. AA oxidizes at more negative potential than DA. In square-wave voltammetry, the sensitivity of the PDMA film-coated BDD electrode for DA in the presence of higher concentration of AA is higher than that of the PDMA film-coated glassy carbon electrode. The hydrodynamic amperometric experiments confirm that the oxidation of AA is not affected by the oxidized product of DA and vice versa. So, unlike the bare electrode the catalytic oxidation of AA by the oxidized DA is eliminated at the PDMA film-coated BDD electrode. The sensitivities of the modified electrode for AA, DA and DOPAC, which are present in the same solution with their physiological concentration ratios, are calculated to be 0.070, 0.363 and 0.084 mA mM À1 , respectively. The modified electrode exhibits a stable and sensitive response to DA.

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confidence: 99%

Selective and sensitive detection of dopamine in the presence of ascorb ic acid and uric acid at a Sonogel - Carbon L - Histidine modified electrode

atyah¹,

Bounab²,

Choukairi³

et al. 2018

jmes

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Design and application of sensitive and selective electrochemical sensors for the determination of biologically important substances have gained considerable interest in recent years [1][2][3][4][5]. Dopamine (DA) is an important neurotransmitter molecule of catecholamines that is widely distributed in the mammalian central nervous system for message transfer. It plays a very important role in the function of central nervous, renal, hormonal, and cardio vascular systems [6]. Extreme abnormalities of DA levels can lead to brain disorders such as parkinsonism and schizophrenia [7,8]. Therefore, developing simple and rapid methods for the sensitive determination of DA in routine analysis is always a challenge [9,10]. In this context, electrochemical techniques have generated considerable attention, in recent years as good tools for the study of electrochemical mechanisms and for the detection and quantification of biological substances, in particular DA, AA and UA. However, AA and UA oxidize at similar potentials with DA and the result is an overlap of their voltammetric responses when using conventional electrodes. This overlap of potentials has an adverse effect on electrode selectivity and reproducibility [11,12]. In literature, there are many papers reporting the manufacture process and analytical applications involving Sonogels. The Sonogel-Carbon materials were patented and described first by Hidalgo-Hidalgo de Cisneros et al [13,14]. Recently a new type of graphite-based sol-gel electrode has been developed, the sonogel-carbon electrode, which was obtained using high-energy ultrasounds. In general, classical procedures for the synthesis of acid catalysed sol-gel-based electrode materials include the addition of an alcoholic solvent to the initial precursor mixture to make it homogenous. This is followed by the employment of an ultrasound bath for several minutes to promote the hydrolysis. in the other hand, by means of sonocatalysis, high-energy ultrasounds is applied directly to the precursors, and ultrasonic cavitation, sol-gel reactions occur in a unique environnement, leading to gels AbstractThe Sonogel-Carbon electrode is a special class of sol-gel electrode that exhibits efficient mechanical and electrical properties. In this study, SonogelCarbon modified with L-Histidine was used to prepare a novel electrochemical sensor. This new electrode showed excellent electrocatalytic behavior towards the oxidation of dopamine (DA) in PBS and human serum. The proposed sensor was applied to the simultaneous determination of dopamine, ascorbic acid (AA) and uric acid (UA) in pH 7.4 PBS and excellent results were obtained. A lower detection limit of 1×10 −7 M was achieved. This work, illustrates, for first time, the use of L-histidine Sonogel-Carbon electrode as a simple and low-cost tool for the selective and sensitive determination of DA in the presence of AA and UA.

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Catalysis of slow charge transfer reactions at polypyrrole-coated glassy carbon electrodes

Cited by 119 publications

References 44 publications

Determination of Uric Acid in the Presence of Ascorbic Acid Using Poly(3,4-ethylenedioxythiophene)-Modified Electrodes

Determination of Uric Acid in the Presence of Ascorbic Acid Using Poly(3,4-ethylenedioxythiophene)-Modified Electrodes

Selective Detection of Dopamine and Its Metabolite, DOPAC, in the Presence of Ascorbic Acid Using Diamond Electrode Modified by the Polymer Film

Selective and sensitive detection of dopamine in the presence of ascorb ic acid and uric acid at a Sonogel - Carbon L - Histidine modified electrode

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