Ion-exchange voltammetry of dopamine at Nafion-coated glassy carbon electrodes: Quantitative features of ion-exchange partition and reassessment on the oxidation mechanism of dopamine in the presence of excess ascorbic acid

Rocha, Luciana S.; Carapuça, Helena M.

doi:10.1016/j.bioelechem.2006.03.040

Cited by 42 publications

(38 citation statements)

References 25 publications

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“…Similar to other polymers used to wrap and solubilize MWCNTs, Nafion bears a polar side chain with a negative charge, which attracts the positively charged Cu 2+ and Ni 2+ ions, facilitating the formation of CuNi/MWCNT hybrid composites in the following electrodeposition process. In addition, the negatively charged Nafion film can readily repel foreign species such as ascorbic acid, paracetamol, and uric acid; as a result, the analytical sensitivity and system versatility are improved [35,36]. Therefore, the use of Nafion as a solubilizing agent for MWCNTs provides a useful avenue for preparing CuNi/ MWCNT-based biosensors.…”

Section: Introductionmentioning

confidence: 95%

Copper/nickel nanoparticle decorated carbon nanotubes for nonenzymatic glucose biosensor

Liu

Chen

et al. 2015

J Solid State Electrochem

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In this study, copper/nickel (CuNi) particle decorated multiwalled carbon nanotubes (MWCNTs) have been fabricated for nonenzymatic glucose detection by the electrodeposition of CuNi particles on a glassy carbon electrode (GCE) modified with Nafion-functionalized MWCNTs (fMWCNTs). Scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyses reveal that CuNi particles were successfully deposited on the fMWCNTs/GCE. The as-synthesized CuNi/fMWCNT composite reveals the shape characteristics of dendrite with a Cu/Ni atomic ratio of around 88.1/11.9. The nonenzymatic glucose sensor based on CuNi/fMWCNT composite shows excellent electrocatalytic activity toward glucose oxidation with a high sensitivity (1470.2 μA cm −2 mM −1 ), a low detection limit (2.5 nM, signal/noise (S/N) ratio=3), and a wide linear range (0.1-5000 μM). Moreover, the sensor has been successfully used for the assay of glucose in human serum samples with good recovery, ranging from 95.6 to 100.1 %. These results indicate that CuNi/fMWCNT composite is an ideal candidate for novel nonenzymatic glucose sensor because of its high sensitivity, good selectivity, good stability, and low cost.

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Section: Introductionmentioning

confidence: 95%

Copper/nickel nanoparticle decorated carbon nanotubes for nonenzymatic glucose biosensor

Liu

Chen

et al. 2015

J Solid State Electrochem

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“…However, the oxidation signal of DA on unmodified electrodes overlaps with those of some oxidizable components of biological liquids, e.g. ascorbic and uric acids [7,8]. The concentrations of interferences in biological fluids are usually much higher than those of an analyte and prevent DA detection in vivo.…”

Section: Introductionmentioning

confidence: 99%

Dopamine Sensor Based on a Composite of Silver Nanoparticles Implemented in the Electroactive Matrix of Calixarenes

et al. 2011

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A sensitive electrochemical sensor based on a composite containing silver nanoparticles and a redox active thiacalixarene with catechol fragments in the substituents at the lower rim has been developed and used for dopamine detection. The electrochemical investigation of thiacalixarene in homogeneous solution and on the electrode interface showed the reversible character of the redox conversion of catechol fragments and its involvement in the chemical reduction of silver which resulted in formation of uniform nanoparticles of 4-6 nm in diameter. The use of such a material for electrode modification made it possible to record a high amplitude cathodic signal at À700 mV that was proportional to the dopamine concentration within 1 nM-1 mM. (limit of detection 0.5 nM).

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“…It should be due to the electrostatic repulsion between the anionic -SO3 -groups of Nafion and the anionic molecules (UA and AA). 19,20 Although modification with Nafion could improve the selectivity of CO at the Pt-Ru electrode from UA and AA, it was not effective for minimizing the current response due to HP.…”

Section: Nafion-coated Pt-ru Electrodementioning

confidence: 99%

“…Nafion can be act as a permselective membrane, which can exclude the diffusion of UA and AA. 19,20 MnO2 is a well-known catalyst for HP decomposition into H2O and O2. Chitosan is a natural organic polymer with excellent properties for an immobilization matrix for a biosensor such as low cost, high mechanical strength, good film-forming capability, biocompatibility and nontoxicity.…”

Section: Introductionmentioning

confidence: 99%

Sensitive and Selective Electrochemical Detection of Carbon Monoxide in Saline at a Pt-Ru/Nafion/MnO2-Modified Electrode

2012

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Ion-exchange voltammetry of dopamine at Nafion-coated glassy carbon electrodes: Quantitative features of ion-exchange partition and reassessment on the oxidation mechanism of dopamine in the presence of excess ascorbic acid

Cited by 42 publications

References 25 publications

Copper/nickel nanoparticle decorated carbon nanotubes for nonenzymatic glucose biosensor

Copper/nickel nanoparticle decorated carbon nanotubes for nonenzymatic glucose biosensor

Dopamine Sensor Based on a Composite of Silver Nanoparticles Implemented in the Electroactive Matrix of Calixarenes

Sensitive and Selective Electrochemical Detection of Carbon Monoxide in Saline at a Pt-Ru/Nafion/MnO2-Modified Electrode

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