scholarly journals A Sensitive and Low-cost Analytical Method for the Electrochemical Determination of Quercetin, Based on 1-Ethylpyridinium Bromide/Carbon Paste Composite Electrode

2015 ◽  
Vol 7 (2) ◽  
Author(s):  
Francis Merlin Melataguia Tchieno ◽  
Ignas Kenfack Tonle ◽  
Evangeline Njanja ◽  
Emmanuel Ngameni
Keyword(s):  
Analytical Method ◽  
Composite Electrode ◽  
Low Cost ◽  
Electrochemical Determination ◽  
Carbon Paste

scholarly journals A Sensitive and Low-cost Analytical Method for the Electrochemical Determination of Quercetin, Based on 1-Ethylpyridinium Bromide/Carbon Paste Composite Electrode

2015 ◽  
Vol 7 (2) ◽  
pp. 27 ◽  
Author(s):  
Francis Tchieno ◽  
Ignas Tonle ◽  
Evangeline Njanja ◽  
Emmanuel Ngameni
Keyword(s):  
Carbon Paste Electrode ◽  
Analytical Method ◽  
Composite Electrode ◽  
Low Cost ◽  
Reduction Peak ◽  
Cyclic Voltammogram ◽  
Current Response ◽  
Carbon Paste ◽  
Paste Electrode

We report a simple, sensitive and low-cost electrochemical procedure for the quantification of quercetin (QCT), a flavonoid and an antioxidant, based on 1-ethylpyridinium bromide modified carbon paste electrode. A 1-ethylpyridinium bromide/carbon paste composite electrode was used. The cyclic voltammogram of QCT showed two oxidation peaks at +0.575 V (vs Ag/AgCl/3M KCl) and +0.865 V (vs Ag/AgCl/3M KCl), and a reduction peak at +0.371 V (vs Ag/AgCl/3M KCl) in HCl/KCl solution at pH 1. Differential pulse voltammetry (DPV) analysis in HCl/KCl at pH 1 showed three well-defined oxidation peaks while a single peak was recorded in phosphate buffer at pH 3. The peak currents of QCT significantly increased at the 1-ethylpyridinium bromide modified electrode in comparison with those recorded at the bare carbon paste electrode. This allowed the use of adsorptive stripping voltammetry to develop a simple and sensitive electroanalytical method for the determination of QCT. Key experimental parameters such as pH of the supporting electrolyte, the preconcentration time, the electrolysis potential, electrode composition, QCT concentration and interferents were investigated. The current response was found to be directly proportional to the concentration of QCT in the range from 2.48 x 10-7 M to 7.43 x 10-6 M, leading to a detection limit of 4.48 x 10-8 M. The developed analytical method was successfully applied to the determination of QCT in human urine samples.

scholarly journals Electroanalytical Performance of a Carbon Paste Electrode Modified by Coffee Husks for the Quantification of Acetaminophen in Quality Control of Commercialized Pharmaceutical Tablets

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Serge Foukmeniok Mbokou ◽  
Maxime Pontié ◽  
Jean-Philippe Bouchara ◽  
Francis Merlin Melataguia Tchieno ◽  
Evangeline Njanja ◽  
...  
Keyword(s):  
Carbon Paste Electrode ◽  
Low Cost ◽  
Pharmaceutical Formulations ◽  
Differential Pulse ◽  
Electrochemical Determination ◽  
Current Response ◽  
Carbon Paste ◽  
Pharmaceutical Tablets ◽  
Paste Electrode

Electrochemical determination of acetaminophen (APAP) was successfully performed using a carbon paste electrode (CPE) modified with coffee husks (CH-CPE). Scanning electron microscopy (SEM) and SEM-energy dispersive X-ray spectroscopy (SEM-EDX) were, respectively, used for the morphological and elemental characterization of coffee husks prior to their utilization. The electrochemical oxidation of APAP was investigated by cyclic voltammetry (CV), differential pulse voltammetry (DPV), and square wave voltammetry (SWV). SWV technique appeared to be more sensitive since the oxidation current of APAP was twofold higher with the CH-CPE sensor than with the bare CPE, in relation to the increase in the organophilic character of the electrode surface. Furthermore, on CH-CPE, the current response of APAP varied linearly with its concentration in the range of 6.6 μM to 0.5 mM, leading to a detection limit of 0.66 μM (S/N=3). Finally, the proposed CH-CPE sensor was successfully used to determine the amount of APAP in commercialized tablets (Doliprane® 500 and Doliprane 1000), with a recovery rate ranging from 98% to 103%. This novel sensor opens the way for the development of low-cost and reliable devices for the electroanalysis of pharmaceutical formulations in developing countries.

scholarly journals A novel carbon paste electrode based on nitrogen-doped hydrothermal carbon for electrochemical determination of carbendazim

2017 ◽  
Vol 82 (11) ◽  
pp. 1259-1272 ◽  
Author(s):  
Ana Kalijadis ◽  
Jelena Djordjevic ◽  
Zsigmond Papp ◽  
Bojan Jokic ◽  
Vuk Spasojevic ◽  
...  
Keyword(s):  
Carbon Paste Electrode ◽  
Low Cost ◽  
Nitrogen Concentration ◽  
Differential Pulse ◽  
Electrochemical Determination ◽  
Carbon Paste ◽  
Nitrogen Doped ◽  
Cyclic Voltammetry Measurement ◽  
Paste Electrode

In this work, a new carbon paste electrode, prepared from nitrogen- -doped hydrothermal carbon (CHTCN) was applied for the electrochemical detection and determination of carbendazim fungicide. CHTCN samples with the nominal nitrogen content 0.05?0.5 wt. % in glucose precursor were prepared by simple, low-cost synthesis with the accompanying carbonization to 1273 K. The presence of nitrogen in CHTCN samples was confirmed by elemental analysis. Characterization of CHTCN as material for carbon paste electrode was achieved by cyclic voltammetry measurement of the Fe(CN)6 3-/4- redox couple. The results showed that best electrochemical response was obtained from the sample with a nominal nitrogen concentration of 0.1 wt. % and with tricresyl phosphate as a binder. During the development of a differential pulse stripping voltammetric method for carbendazim determination applying new electrode, the following experimental parameters were studied: the sort and amount of binding liquid, the effect of pH, accumulation potential and accumulation time. Under optimal conditions, the electrode offered linearity in the wide concentration range from 25 to 490 ng cm-3 and an estimated detection limit of 1.21 ng cm-3. Moreover, the electrode showed good stability, high selectivity and satisfactory anti-interference ability. Finally, the developed method was successfully applied for the determination of carbendazim traces in spiked tap and river water samples.

Mercury nanodroplets supported at biochar for electrochemical determination of zinc ions using a carbon paste electrode

2015 ◽  
Vol 151 ◽  
pp. 525-530 ◽  
Author(s):  
Paulo Roberto de Oliveira ◽  
Alyne Cristina Lamy-Mendes ◽  
Jeferson Luiz Gogola ◽  
Antonio Salvio Mangrich ◽  
Luiz Humberto Marcolino Junior ◽  
...  
Keyword(s):  
Carbon Paste Electrode ◽  
Electrochemical Determination ◽  
Zinc Ions ◽  
Carbon Paste ◽  
Paste Electrode

Recent Advances in Electrochemical Determination of Pesticides

2021 ◽  
Vol 21 (12) ◽  
pp. 5795-5811
Author(s):  
Milan Z. Momčilović ◽  
Jelena S. Milićević ◽  
Marjan S. Ranđelović
Keyword(s):  
Electrochemical Sensors ◽  
Work Force ◽  
Electrochemical Determination ◽  
Human Consumption ◽  
Agricultural Practice ◽  
Carbon Paste ◽  
Boron Doped Diamond ◽  
Voltammetric Detection ◽  
Sensitivity And Selectivity

Widespread usage of pesticides in agricultural practice caused their residues to appear in water and food products intended for human consumption. The potential toxicity of these resources has raised awareness about pesticide tracking in the environment. Development of reliable electrochemical sensors for the on-site determination of pesticide concentrations is envisioned as an alternative to conventional chromatographic methods which are robust, expensive and require skilled work force. Modification of the working electrode surface can result in enhanced electrochemical response towards selected pesticide making such electrode convenient sensor for facile and efficient determination of pesticides in low concentrations. New generation of nanomaterials is applied in electrode modification in order to improve its sensitivity and selectivity. The present review summarizes significant advances in voltammetric detection of pesticides for the period of the past five years. The major focus of this review is set to the types of carbon and oxide based materials, metal nanoparticles, composites and other materials employed to upgrade standard electrode configurations such as glassy carbon and carbon paste electrodes, boron doped diamond electrodes, screen printed and film electrodes, metal and amalgam, and other kinds of electrodes.

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