ZnO–CuxO/polypyrrole nanocomposite modified electrode for simultaneous determination of ascorbic acid, dopamine, and uric acid

Ghanbari, Kh.; Hajheidari, N.

doi:10.1016/j.ab.2014.12.013

Cited by 126 publications

(32 citation statements)

References 74 publications

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“…The regression equation was I pa = À 1.025(� 0.15) + 2.15(� 0.10)UA C (correlation coefficient R 2 = 0.984), and the detection limit (3 s/b with the first eight points) was 0.13 μmol L À 1 . The optimal conditions for deposition steps were as follows: pH = 3.3 (PBS) at 0.10 V for 30.0 s and a stripping step with a frequency of 15 Hz, step amplitude of 0.01 V, and potential amplitude of 0.05 V. Regarding the limit of detection, previous studies have reported similar values using more structured electrodes [15][16][17][18][19][20]. The results show the versatility of the Cu C /CPE in UA detection.…”

Section: Detection Limit Based On the Calibration Curvementioning

confidence: 60%

“…Moreover, in 2013, Esra et al reported on the latest electrodes modified through enzyme immobilization techniques [8], and in 2014, Chen et al reported onrecently developed enzyme-free modified electrodes, in which the biological component of the modified electrode is replaced with nanostructured metals, primarily Pt, Pd, Au, Ag and Cu,and these electrodes have reported detection limits between 0.10 and 0.010 nmol L À 1 [9]. Pt and Au nanoparticles fused with carbon nanotubes on glassy carbon are the most reported modified electrodes to detect UA using metal ions [10][11][12][13][14][15] with detection limits similar to that reported in this paper, but with the advantage of being a more economical and easy to produce device in this new report.Copper nanoparticles and copper complexes have recently been used in the development of modified electrodes fused with metal ions and polymers on glassy carbon for uric acid detection [15][16][17][18][19][20]. In these reports, the oxidation signal for uric acid was observed between 0.50 and 0.61 V, with a detection limit between 5.7 μmol L À 1 and 0.8 nmol L À 1 .…”

Section: Introductionmentioning

confidence: 99%

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Sensitive and Profitable Electrochemical Detection of Uric Acid in the Presence of Dopamine with a Novel Carbon Paste Electrode Decorated with a Copper(II) Complex

et al. 2019

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A new microcomposite with copper(II) complex and carbon paste (CuC/CPE) was developed to determine the uric acid (UA) content in the presence of dopamine (DP) and was characterized via cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and energy dispersive spectroscopy (EDS). The results showed high selectivity for UA compared with DP because the anodic peak currents for DP were near those of a CPE without Cuc and were considerably increased for UA. The UA and DP increases were 86.9 % and 14.3 %, respectively, according to CV and 96.6 % and 25.5 %, respectively, according to square wave voltammetry (SWV) with the CuC/CPE. Moreover, the anodic peak separation for UA and DP was 0.17 V. With optimal parameters (pH, 3.3; adsorption time(tADS), 30 s;adsorption potential (EADS), 0.10 V), the anodic peak currents for UA were proportional to concentrations between 1.6 and 14.4 μmol L−1 using standard solutions with UA concentrations ranging from 8.0–40.5 μmol L−1 and real samples. The UA detection limit was 0.13 μmol L−1. The new sensor was used to determine the UA contentin human urine samples, and the method was checked with a urine chemistry control from Bio‐Rad based on human urine spiked with quantities of UA and showed a recovery between 84 % and 106 % at concentrations below 10.0 μmol L−1.

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Section: Detection Limit Based On the Calibration Curvementioning

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Sensitive and Profitable Electrochemical Detection of Uric Acid in the Presence of Dopamine with a Novel Carbon Paste Electrode Decorated with a Copper(II) Complex

et al. 2019

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“…The stepwise formation of the sensor demonstrated in Figure . The resultant ZnO−Cu x O‐PPy/GC electrode showed improved sensitivity and selectivity towards detection of AA, DA, and UA in an assortment .…”

Section: Comparison Of the Modified Electrodes For Simultaneous Sensimentioning

confidence: 99%

Modified Electrodes for Selective Voltammetric Detection of Biomolecules

2018

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Electrochemical sensors for selective analysis of biomolecules got tremendous attention due to their better sensitivity and construction possibility of the portable cost‐effective devices. The individual or simultaneous sensing of ascorbic acid (AA), dopamine (DA), and uric acid (UA) is challenging due to their close electrooxidation and co‐existing. Recent years, substantial progress is made to develop electrode with smart materials to overcome the issue related to simultaneous sensing. This review is comparatively consolidating the work was done in fabrication of electrochemical sensors for the simultaneous sensing of AA, DA and UA. The various modification materials such as graphene, CNTs, conductive polymers and the ionic liquids characteristics are concisely described with their figure of merits. In the end, the critical analysis, future prospects, and challenges in commercialization are described.

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“…The values of linear range and LOD in this study were compared with the values in the literature and listed in Table . The results obtained with CV and DPV methods showed that the PMR 8 film modified electrode exhibited wider linear ranges and lower detection limits than the electrodes in the literatures . In addition, the PMR modified electrode gave some more advantages such as easy preparation and low coast.…”

Section: Electrochemical Response Of Uric Acid At Pmr Modified Electrmentioning

confidence: 99%

Poly(Methyl Red) Modified Glassy Carbon Electrodes: Electrosynthesis, Characterization, and Sensor Behavior

Kul

Öztürk

2017

Electroanalysis

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Poly(methyl red), PMR, was electropolymerized on glassy carbon electrodes by potential cycling in 50 mM phosphate buffer solution at pH 7.0 and 8.0 and Britton Robinson buffer solution in the pH range 7.0‐11.0. The electrochemical behavior of PMR modified electrodes was investigated by cyclic voltammetry in Britton Robinson buffer solution at different pHs from 5.0 to 10.0 and found that the best PMR film formation was obtained at pH 9.0. Uric acid was quantitatively determined at PMR modified electrodes by cyclic voltammetry and differential pulse voltammetry in Britton Robinson buffer at pH 5.0. Both methods presented a linear dependence between the anodic peak current and the concentration of uric acid in the range of 0.4 to 60 μM and 0.08 to 100 μM with the limits of detection of 0.038 and 0.009 μM for cyclic voltammetry and differential pulse voltammetry, respectively. Poly(methyl red) as redox mediator allowed the determination of uric acid without any interferences from the substances in serum samples.

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ZnO–CuxO/polypyrrole nanocomposite modified electrode for simultaneous determination of ascorbic acid, dopamine, and uric acid

Cited by 126 publications

References 74 publications

Sensitive and Profitable Electrochemical Detection of Uric Acid in the Presence of Dopamine with a Novel Carbon Paste Electrode Decorated with a Copper(II) Complex

Sensitive and Profitable Electrochemical Detection of Uric Acid in the Presence of Dopamine with a Novel Carbon Paste Electrode Decorated with a Copper(II) Complex

Modified Electrodes for Selective Voltammetric Detection of Biomolecules

Poly(Methyl Red) Modified Glassy Carbon Electrodes: Electrosynthesis, Characterization, and Sensor Behavior

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