Poly(gallic acid)/MWNT-modified electrode for the selective and sensitive voltammetric determination of quercetin in medicinal herbs

Ziyatdinova, Guzel; Kozlova, Ekaterina; Budnikov, H. C.

doi:10.1016/j.jelechem.2017.12.071

Cited by 44 publications

(38 citation statements)

References 38 publications

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“…MWNT/GCE was inserted in the cell and five scans of the phosphate buffer solution pH 6.0 were run for the stable blank voltammogram achievement. Then, PGA layer was deposited using potentiodynamic electrolysis by 15 cycles in the potential window of −0.2–+1.0 V and the scan rate of 100 mV s −1 from 10 μM gallic acid .…”

Section: Methodssupporting

confidence: 88%

“…Summarizing the mentioned above, it can be concluded that there are no electrodes modified with polymeric films for capsaicinoids quantification at present time although this type of electrodes is widely used in the organic electroanalysis. Thus, fabrication of polymer‐modified electrode in particular using combination of electropolymerized phenolic compounds with carbon nanomaterials as surface modifier could be perspective approach as far as provides conductivity of the electrode, high effective surface area as well as high sensitivity and selectivity of the target analytes response .…”

Section: Introductionsupporting

confidence: 88%

“…The overpotential decrease confirms the increase of the electron transfer rate on the modified electrodes caused by MWNT mainly. The oxidation currents of capsaicinoids are significantly increased (1.2–6.0‐fold) on MWNT/GCE and PGA/MWNT/GCE vs. GCE due to the higher effective surface area of the modified electrodes (120±10 mm 2 for MWNT/GCE and 26±4 mm 2 for PGA/MWNT/GCE in comparison to 4.2±0.1 mm 2 for bare GCE (Figure S1)). The hydrophobic interactions of aromatic rings in the polymeric film structure and capsaicinoids can occur providing accumulation of the analytes on the electrode surface and increase of the oxidation currents consequently.…”

Section: Resultsmentioning

confidence: 99%

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Selective Determination of Total Capsaicinoids in Plant Material Using Poly(Gallic Acid)‐modified Electrode

et al. 2018

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Novel voltammetric approach for the selective determination of total capsaicinoids has been developed using glassy carbon electrode modified with multi‐walled carbon nanotubes and poly(gallic acid) (PGA/MWNT/GCE). The modified electrode provides significant improvements in the capsaicinoids voltammetric characteristics in comparison to GCE and MWNT/GCE. The electrooxidation of capsaicinoids is irreversible adsorption‐controlled process with the anodic transfer coefficient of 0.49–0.53 and heterogeneous electron transfer rate constant of 1300–2400 s−1. The analytical ranges of 0.010–1.0 and 1.0–50 μM for capsaicin, 0.025–0.75 and 0.75–75 μM for dihydrocapsaicin and 0.025–5.0 and 5.0–75 μM for nonivamide with the detection limits of 2.9, 5.9 and 6.1 nM, respectively, have been obtained using differential pulse voltammetry (DPV). The selectivity of the capsaicinoids quantification in the presence of ascorbic acid, α‐tocopherol and carotenoids is shown. The method has been tested on the samples of red hot pepper spices and Capsicum annuum L. tinctures. The results correspond to the chromatographic data.

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Section: Methodssupporting

confidence: 88%

Section: Introductionsupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

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Selective Determination of Total Capsaicinoids in Plant Material Using Poly(Gallic Acid)‐modified Electrode

et al. 2018

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“…Electro‐polymerization is a common method for immobilizing conductive polymers on different surfaces due to their controllable deposition by adjusting the electrochemical parameters. Besides, well‐defined porosity, thickness and charge transferability obtained with polymer structures .…”

Section: Introductionmentioning

confidence: 92%

Electrochemical Determination of Dicofol at Nickel Nanowire Modified Poly(p‐aminophenol) Film Electrode

2019

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An electrochemical sensor was fabricated by construction of nickel nanowires on the surface of poly(p‐aminophenol) (PPAP) modified glassy carbon electrode. The electrochemical response of dicofol, a known pesticide and used for agricultural activities such as cyclic voltammetry and differential pulse voltammetry, were investigated and the results were compared with those obtained unmodified electrodes. Following the optimization of NaOH concentration, polymerization cycle number, Ni nanowire amount, the linear range for the dicofol was studied and found as 0.83–30.7 μmol L−1 (R2=0.9981) at Ni/PPAP/GCE with a 0.08 μmol L−1 detection limit according to S/N=3. Finally, the proposed Ni/PPAP/GCE sensor was successfully applied for the dicofol analysis in soil samples. The characterization of the developed surface was carried out by scanning electron microscopy and X‐Ray photoelectron spectroscopy.

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“…Among many conductive polymers, poly(gallic acid) (PGA) represents an interesting candidates as biocompatible interface for whole, living bacterial cells as its structure makes it quite adapt for interacting with the quinol/quinone moieties of several biomolecules. [9] The production of gallic acid dimers or polymers can be obtained with high yield and rapidly under several conditions that include electropolymerization and organometallic synthesis [10], which are too harsh for biological systems. In particular, organometallic processes exploit high temperature, prolonged timings of exposure to toxic organic solvents and the use of heavy metal salts, conditions which are not compatible for biological interfaces.…”

mentioning

confidence: 99%

Synthesis of (poly)gallic acid in a bacterial growth medium

et al. 2020

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Bioelectronics requires versatile, efficient, and low-cost interfaces between the biological entities and the conductive unit. Conductive polymers represent a valid choice to assemble such interfaces able to extract or impinge charges between the biological units and the conductive electronic systems. A drawback in the use of such systems is that the polymerization reaction often takes place in environments whose chemical and physical characteristics clash with the mild conditions required for living biological systems. In the present work, we successfully prove that the conductive polymer poly(gallic acid) can be synthesized in medium designed for bacterial growth, characterised by the presence of several adverse conditions including numerous chemicals, high ionic strength, and almost neutral pH. The gallic acid successfully polymerizes within few hours and with a 40% yield, by exploiting the catalytic activity of the enzyme laccase from the polypore mushroom Trametes versicolor. The resulting polymer is characterised by absorption and Nuclear Magnetic Resonance spectroscopies. The viability of Rhodobacter sphaeroides culture, assessed via the coffee-ring technique, shows an important, but not complete detrimental effect of the gallic acid on the bacterial growth.

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Poly(gallic acid)/MWNT-modified electrode for the selective and sensitive voltammetric determination of quercetin in medicinal herbs

Cited by 44 publications

References 38 publications

Selective Determination of Total Capsaicinoids in Plant Material Using Poly(Gallic Acid)‐modified Electrode

Selective Determination of Total Capsaicinoids in Plant Material Using Poly(Gallic Acid)‐modified Electrode

Electrochemical Determination of Dicofol at Nickel Nanowire Modified Poly(p‐aminophenol) Film Electrode

Synthesis of (poly)gallic acid in a bacterial growth medium

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