Voltammetric determination of dopamine in the presence of ascorbic acid and uric acid at sodium dodecyl sulphate/reduced graphene oxide modified carbon paste electrode

Vidya, H.; Swamy, B.E. Kumara

doi:10.1016/j.molliq.2015.07.011

Cited by 17 publications

(6 citation statements)

References 51 publications

(37 reference statements)

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“…The lower ΔE p for the ERGO-BDDPEs implies faster electron-transfer kinetics from the ERGO modification. 58 Figure S2c shows a linear dependence of the peak current versus square root of the v for both unmodified and modified electrodes, indicating that the electrochemical processes at both electrodes are diffusioncontrolled. 59 The surface area of the electrodes was determined by using Randles−Sevcik equation 60…”

Section: ■ Results and Discussionmentioning

confidence: 94%

“…Δ E p at the unmodified BDDPEs increases from 190 ± 4 mV at 0.01 V s –1 to 387 ± 7 mV at 0.1 V s –1 , whereas Δ E p at the ERGO-BDDPEs increases from 120 ± 5 mV at 0.01 V s –1 to 280 ± 7 mV at 0.1 V s –1 . The lower Δ E p for the ERGO-BDDPEs implies faster electron-transfer kinetics from the ERGO modification Figure S2c shows a linear dependence of the peak current versus square root of the v for both unmodified and modified electrodes, indicating that the electrochemical processes at both electrodes are diffusion-controlled …”

Section: Resultsmentioning

confidence: 99%

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Boron Doped Diamond Paste Electrodes for Microfluidic Paper-Based Analytical Devices

et al. 2017

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Boron doped diamond (BDD) electrodes have exemplary electrochemical properties; however, widespread use of high-quality BDD has previously been limited by material cost and availability. In the present article, we report the use of a BDD paste electrode (BDDPE) coupled with microfluidic paper-based analytical devices (μPADs) to create a low-cost, high-performance electrochemical sensor. The BDDPEs are easy to prepare from a mixture of BDD powder and mineral oil and can be easily stencil-printed into a variety of electrode geometries. We demonstrate the utility and applicability of BDDPEs through measurements of biological species (norepinephrine and serotonin) and heavy metals (Pb and Cd) using μPADs. Compared to traditional carbon paste electrodes (CPE), BDDPEs exhibit a wider potential window, lower capacitive current, and are able to circumvent the fouling of serotonin. These results demonstrate the capability of BDDPEs as point-of-care sensors when coupled with μPADs.

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Section: ■ Results and Discussionmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Boron Doped Diamond Paste Electrodes for Microfluidic Paper-Based Analytical Devices

et al. 2017

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“…This can be solved by the implementation of selective layers on the electrode surface. For that, electrodes have been modified with Nafion®, [34,35] self-assembled monolayers at gold electrodes, [36,37] polymer-films, [38] surfactants, [39] molecular imprinted polymers, [40] amino acids and DNA. [41] Also, the covalent modification of CNTs at the electrode surface by different functional groups or the noncovalent adsorption of aromatic compounds can improve the selectivity.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Activity Determination of Catechol‐O‐methyl Transferase by Selective Dopamine Detection

et al. 2019

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For the treatment of Parkinson's disease, as one of the most frequent diseases of the central nervous system, several key enzymes for dopamine metabolism [e. g. catechol‐O‐methyl transferase (COMT)] are drug targets. For an efficient and long‐lasting treatment, the activity of this enzyme should be monitored. In this study, an electrochemical approach using differential pulse voltammetry (DPV) is introduced for the activity determination. The applied electrode material, fluorine‐doped tin oxide (FTO), is characterized by a clear discrimination between substrate and product of COMT, a high stability of the dopamine signal during consecutive measurements, and a linear dependency on the dopamine concentration in the range of the maximum reaction rate of COMT. Despite these advantageous results, dopamine detection in the complete activity assay is influenced by each of the added essential assay components, even though none of the added components reveal a current signal at the FTO electrode itself. After adjusting the potential range and the assay composition, these effects can be circumvented. By following the dopamine concentrations during COMT action, it can be shown that the activity of COMT can be detected by using differential pulse voltammetry (DPV) at an FTO electrode and, by analyzing different COMT amounts, quantification can be demonstrated.

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“…In recent years, modified carbon paste electrodes have extensively been applied for the determination of DA and AA. For instance, the electrochemical behavior of these biologically important compounds was investigated at the carbon paste electrodes modified with Eriochrome Black T (EBT), 6 reduced graphene oxide, 7 N-butylpyridinium hexafluorophosphate, 8 thionine-nafion ion-paired 9 and thionine-nafion supported on multi-walled carbon nanotube. 10 Recently, application of carbon nanotubes in the modification of the carbon paste electrodes has performed for detection of DA.…”

Section: Introductionmentioning

confidence: 99%

“…10 Recently, application of carbon nanotubes in the modification of the carbon paste electrodes has performed for detection of DA. [11][12][13] Application of nanoparticles, 10,11,[14][15][16][17][18][19][20][21] complexes of transition metals, [22][23][24][25] surfactants, 7,15 ionic liquids 8,12 and polymeric materials, 23,26 in preparation of modified carbon paste electrodes have attracted most consideration in this regard. Using the electron mediators in modification of the electrodes, causes to decrease the overpotential of the electrochemical process of the interested analyte and of course improve the selectivity and sensitivity of the electrode response.…”

Section: Introductionmentioning

confidence: 99%

Cis-dioxo-bis [3-methoxy-2,2-dimethylpropanediamine] Molybdenum/Surfactant-Modified Electrode for Simultaneous Sensing of Ascorbic Acid and Dopamine

Arjmandi¹,

Zare-Mehrjardi

Kargar³

2018

ACSi

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In this work, the carbon paste electrode (CPE) was modified using the cis-dioxo-bis[3-methoxy-2,2-dimethylpropanediamine] molybdenum(VI) complex and 1-octanaminium,N,N,N-trioctyl bromide. Using the modified electrode, the best separation of anodic peaks for ascorbic acid and dopamine was obtained in solutions with pH 5.0 and the linear range for ascorbic acid is acquired in the range from 3.0 × 10 −6 to 6.0 × 10 −3 M and for dopamine from 2.0 × 10 −6 to 1.0 × 10 −2 M. The limits of detection (S/N = 3) were 4 × 10 −7 M and 5 × 10 −7 M for dopamine and ascorbic acid, respectively. Surface regeneration and the very easy preparation of the modified CPE together with the very good peak resolution and sub-micromolar detection limits designate the prepared carbon paste electrode appropriate for simultaneous voltammetric determination of dopamine and ascorbic acid.

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Voltammetric determination of dopamine in the presence of ascorbic acid and uric acid at sodium dodecyl sulphate/reduced graphene oxide modified carbon paste electrode

Cited by 17 publications

References 51 publications

Boron Doped Diamond Paste Electrodes for Microfluidic Paper-Based Analytical Devices

Boron Doped Diamond Paste Electrodes for Microfluidic Paper-Based Analytical Devices

Electrochemical Activity Determination of Catechol‐O‐methyl Transferase by Selective Dopamine Detection

Cis-dioxo-bis [3-methoxy-2,2-dimethylpropanediamine] Molybdenum/Surfactant-Modified Electrode for Simultaneous Sensing of Ascorbic Acid and Dopamine

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