Electroanalysis of nicotine at an electroreduced carboxylated graphene modified glassy carbon electrode

2015 ◽  
Vol 7 (3) ◽  
pp. 1147-1153 ◽  
Author(s):  
Hualing Xiao ◽  
Lingen Sun ◽  
Hongling Yan ◽  
Wen Wang ◽  
Jiali Liu ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Phosphate Buffer ◽  
Phosphate Buffer Solution ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Buffer Solution

Nicotine is determined at a glassy carbon electrode modified with partially electroreduced carboxylated graphene by cyclic voltammetry and semi-derivative treatment after enrichment at −1.1 V in 0.1 M pH 7.0 phosphate buffer solution.

Preparation and characterization of a poly-o-phenylenediamine film modified glassy carbon electrode as a H2O2 sensor

2013 ◽  
Vol 91 (11) ◽  
pp. 1077-1084 ◽  
Author(s):  
Wenying Zhai ◽  
Xiuying Tian ◽  
Yun Yan ◽  
Yuehua Xu ◽  
Yuechun Zhao ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Electrochemical Impedance ◽  
Monomer Concentration ◽  
Acetate Buffer ◽  
Acetate Buffer Solution ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Buffer Solution

A poly-o-phenylenediamine film modified glassy carbon electrode (PoPD/GC) was successfully prepared by cyclic voltammetry in acetate buffer solution. The polymerization mechanism of oPD is discussed. The impedance behavior and morphology of the PoPD membrane were characterized using cyclic voltammetry, electrochemical impedance spectroscopy, and scanning electron microscopy, respectively. It is discovered that the PoPD/GC prepared only in acetate buffer solution had dual electrocatalytic activity toward the oxidation and reduction of H2O2. The optimal buffer solution pH, scanning rate, monomer concentration, and number of scannings for film forming were 4.2, 0.05 V s−1, 6.0 mmol L−1, and 30, respectively. The linear ranges between the anodic (Δia) or cathodic (Δic) current and H2O2 concentration were 0.07−1.0 × 104 and 0.04−4.5 × 104 μmol L−1, respectively. The corresponding calibration curves were Δia (μA) = 8.03c (mmol L−1) + 6.36 (n = 18, R2 = 0.9989) and Δic (μA) = −5.52c (mmol L−1) − 0.77 (n = 18, R2 = 0.9990) with a detection limit of 0.03 and 0.02 μmol L−1 (S/N = 3), respectively. The PoPD/GC prepared in the optimal conditions showed good stability and quick response (<0.2 s) to H2O2, which was successfully applied to the determination of H2O2 in real water samples with satisfactory results.

Electrooxidation and determination of perphenazine on a graphene oxide nanosheet-modified electrode

RSC Advances ◽  
2015 ◽  
Vol 5 (27) ◽  
pp. 21005-21011 ◽  
Author(s):  
H. Heli ◽  
N. Sattarahmady ◽  
S. N. Zare
Keyword(s):  
Graphene Oxide ◽  
Glassy Carbon ◽  
Electrochemical Behavior ◽  
Phosphate Buffer ◽  
Phosphate Buffer Solution ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Buffer Solution ◽  
Graphene Oxide Nanosheet

The electrochemical behavior of perphenazine was investigated on a graphene oxide nanosheet-modified glassy carbon electrode in a phosphate buffer solution at pH 7.4.

Solar Exfoliated Graphene Oxide: A Platform for Electrochemical Sensing of Epinephrine

2020 ◽  
Vol 16 (4) ◽  
pp. 393-403 ◽  
Author(s):  
Renjini Sadhana ◽  
Pinky Abraham ◽  
Anithakumary Vidyadharan
Keyword(s):  
Cyclic Voltammetry ◽  
Graphene Oxide ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Simultaneous Detection ◽  
Differential Pulse ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Reduced Graphene ◽  
Pulse Voltammetry

Introduction: In this study, solar exfoliated graphite oxide modified glassy carbon electrode was used for the anodic oxidation of epinephrine in a phosphate buffer medium at pH7. The modified electrode showed fast response and sensitivity towards Epinephrine Molecule (EP). The electrode was characterized electrochemically through Cyclic Voltammetry (CV) and Differential Pulse Voltammetry (DPV). Area of the electrode enhanced three times during modification and studies reveal that the oxidation process of EP occurs by an adsorption controlled process involving two electrons. The results showed a detection limit of 0.50 ± 0.01μM with a linear range up to 100 μM. The rate constant calculated for the electron transfer reaction is 1.35 s-1. The electrode was effective for simultaneous detection of EP in the presence of Ascorbic Acid (AA) and Uric Acid (UA) with well-resolved signals. The sensitivity, selectivity and stability of the sensor were also confirmed. Methods: Glassy carbon electrode modified by reduced graphene oxide was used for the detection and quantification of epinephrine using cyclic voltammetry and differential pulse voltammetry. Results: The results showed an enhancement in the electrocatalytic oxidation of epinephrine due to the increase in the effective surface area of the modified electrode. The anodic transfer coefficient, detection limit and electron transfer rate constant of the reaction were also calculated. Conclusion: The paper reports the determination of epinephrine using reduced graphene oxide modified glassy carbon electrode through CV and DPV. The sensor exhibited excellent reproducibility and repeatability for the detection of epinephrine and also its simultaneous detection of ascorbic acid and uric acid, which coexist in the biological system.

scholarly journals Electrochemical Oxidation of Paracetamol Mediated byMgB2Microparticles Modified Glassy Carbon Electrode

2011 ◽  
Vol 8 (2) ◽  
pp. 553-560 ◽  
Author(s):  
Mohammed Zidan ◽  
Tan Wee Tee ◽  
A. Halim Abdullah ◽  
Zulkarnain Zainal ◽  
Goh Joo Kheng
Keyword(s):  
Cyclic Voltammetry ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Supporting Electrolyte ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Diffusion Controlled ◽  
Scan Rate ◽  
Degree Of Stability ◽  
A Current

A MgB2microparticles modified glassy carbon electrode (MgB2/GCE) was fabricated by adhering microparticles of MgB2onto the electrode surface of GCE. It was used as a working electrode for the detection of paracetamol in 0.1 M KH2PO4aqueous solution during cyclic voltammetry. Use of the MgB2/GCE the oxidation process of paracetamol with a current enhancement significantly by about 2.1 times. The detection limit of this modified electrode was found to be 30 μM. The sensitivity under conditions of cyclic voltammetry is significantly dependent on pH, supporting electrolyte, temperature and scan rate. The current enhancement observed in different electrolytic media varied in the following order: KH2PO4> KCl > K2SO4> KBr. Interestingly, the oxidation of paracetamol using modified GC electrode remain constant even after 15 cycling. It is therefore evident that the MgB2modifiedGCelectrode possesses some degree of stability. A slope of 0.52 dependent of scan rate on current indicates that the system undergoes diffusion-controlled process.

scholarly journals Analysis of the Overlapped Electrochemical Signals of Hydrochlorothiazide and Pyridoxine on the Ethylenediamine-Modified Glassy Carbon Electrode by Use of Chemometrics Methods

Molecules ◽  
2019 ◽  
Vol 24 (14) ◽  
pp. 2536 ◽  
Author(s):  
Yue Zhang ◽  
Yan Zhou ◽  
Shujun Chen ◽  
Yashi You ◽  
Ping Qiu ◽  
...  
Keyword(s):  
Least Squares ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Principal Component ◽  
Potential Range ◽  
Carbon Electrode ◽  
Separation And Purification ◽  
Modified Glassy Carbon Electrode ◽  
Buffer Solution ◽  
Experimental Conditions

In this work, the electrochemical behavior of hydrochlorothiazide and pyridoxine on the ethylenediamine-modified glassy carbon electrode were investigated by differential pulse voltammetry. In pH 3.4 Britton-Robinson (B-R) buffer solution, both hydrochlorothiazide and pyridoxine had a pair of sensitive irreversible oxidation peaks, that overlapped in the 1.10 V to 1.20 V potential range. Under the optimum experimental conditions, the peak current was linearly related to hydrochlorothiazide and pyridoxine in the concentration range of 0.10–2.0 μg/mL and 0.02–0.40 μg/mL, respectively. Chemometrics methods, including classical least squares (CLS), principal component regression (PCR) and partial least squares (PLS), were introduced to resolve the overlapped signals and determine the two components in mixtures, which avoided the troublesome steps of separation and purification. Finally, the simultaneous determination of the two components in commercial pharmaceuticals was performed with satisfactory results.

Electrocatalytic Oxidation of Nitrite at Platinum Particles Modified Glassy Carbon Electrode

2012 ◽  
Vol 512-515 ◽  
pp. 2291-2294
Author(s):  
Yu Cui Hao ◽  
Li Shen ◽  
Zhi Ai
Keyword(s):  
Cyclic Voltammetry ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Electrocatalytic Oxidation ◽  
Influence Factors ◽  
Carbon Electrode ◽  
Nitrite Oxidation ◽  
Modified Glassy Carbon Electrode ◽  
Base Solution ◽  
Platinum Particles

Platinum particles modified glassy carbon electrode（Pt/GCE）was prepared by electrochemically deposite. The electrochemica1 behaviors of nitrite on Pt/GCE were studied by cyclic voltammetry. The influence factors of electrocatalysis for nitrite oxidation on Pt/GCE were studied. The result showed that Pt/GCE has favorable electrocatalysis for nitrite. oxidation, which was effected by the amount of platinum particles and the pH of base solution

scholarly journals Electrochemical determination of hydrogen peroxide at glassy carbon electrode modified with palladium nanoparticles

2013 ◽  
Vol 78 (5) ◽  
pp. 701-711 ◽  
Author(s):  
Addisu Kitte ◽  
Desalegn Assresahegn ◽  
Refera Soreta
Keyword(s):  
Hydrogen Peroxide ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Palladium Nanoparticles ◽  
Phosphate Buffer Solution ◽  
Reference Electrode ◽  
Electrochemical Determination ◽  
Carbon Electrode ◽  
Buffer Solution ◽  
Solution Ph

We report here the modification of glassy carbon electrode (GCE) with palladium nanoparticles and palladium film. The response to hydrogen peroxide on the modified electrode was examined using cyclic voltammetry and amperometry (at -0.2 V vs Ag/AgCl reference electrode in the phosphate buffer solution pH 7.4). The palladium film and palladium nanoparticle modified GCE showed a linear response to hydrogen peroxide in the concentration range between 10 ?M to 14 mM and 1 ?M to 14 mM with detection limit of 6.79 ?M and 0.33 ?M, respectively.

A voltammetric sensor based on eosin Y film modified glassy carbon electrode for simultaneous determination of hydroquinone and catechol

2014 ◽  
Vol 6 (16) ◽  
pp. 6494-6503 ◽  
Author(s):  
Jiahong He ◽  
Ri Qiu ◽  
Wenpo Li ◽  
Shaohua Xing ◽  
Zhongrong Song ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Simultaneous Determination ◽  
Glassy Carbon Electrode ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
Eosin Y ◽  
Carbon Electrode ◽  
Voltammetric Sensor ◽  
Modified Glassy Carbon Electrode

By using cyclic voltammetry, eosin Y film was electrodeposited on the surface of glassy carbon electrode (GCE) to obtain the modified electrode (denoted as eosin Y/GCE).

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