The determination of hemovanadin and its oxidation potential

1952 ◽  
Vol 37 (2) ◽  
pp. 449-456 ◽  
Author(s):  
Enzo Boeri
Keyword(s):  
Oxidation Potential

Electroanalytical Behavior of Gallic and Ellagic Acid Using Graphene Modified Screen-Printed Electrodes. Method for the Determination of Total Low Oxidation Potential Phenolic Compounds Content in Cork Boiling Waters

2014 ◽  
Vol 27 (1) ◽  
pp. 177-184 ◽  
Author(s):  
Agustina Guiberteau-Cabanillas ◽  
Belén Godoy-Cancho ◽  
Elena Bernalte ◽  
Miriam Tena-Villares ◽  
Carmen Guiberteau Cabanillas ◽  
...  
Keyword(s):  
Phenolic Compounds ◽  
Ellagic Acid ◽  
Oxidation Potential ◽  
Screen Printed Electrodes ◽  
Screen Printed

scholarly journals Developing an electrochemical sensor based on a carbon paste electrode modified with ZnO nanoparticles synthesized by microwave for determination of chlorpheniramine maleate

2021 ◽  
Vol 4 (01) ◽  
pp. 16-25
Author(s):  
Hamideh Asadollahzadeh
Keyword(s):  
Carbon Paste Electrode ◽  
Zno Nanoparticles ◽  
Electrochemical Behaviour ◽  
Differential Pulse ◽  
Oxidation Potential ◽  
Carbon Paste ◽  
Chlorpheniramine Maleate ◽  
Peak Current ◽  
Paste Electrode

Zinc oxide (ZnO) nanoparticles with an average size of 60 nm have been successfully prepared by microwave irradiation. Carbon paste electrode (CPE) was modified with ZnO nanoparticles and used for the electrochemical oxidation of chlorpheniramine maleate (CPM). Cyclic voltammetry (CV) study of the modified electrode indicated that the oxidation potential shifted towards a lower potential by approximately 106 mV and the peak current was enhanced by 2 fold in comparison to the bare CPE (ZnO/CPE-CV). The electrochemical behaviour was further described by characterization studies of scan rate, pH and concentration of CPM. Under the optimal conditions, the peak current was proportional to CPM concentration in the range of 8.0 ×10-7 to 1.0 × 10-3 mol L-1 with a detection limit of 5.0 × 10-7 mol L-1 by differential pulse voltammetry (DPV). The peak current of CPM is linear in the concentration range of 0.8 - 1000 µM (R2=0.998). The ZnO/CPE has good reproducibility and high stability for the determination of CPM using this electrode. The proposed method was successfully applied to the determination of CPM in pharmaceutical samples. In addition, the important analytical parameters were compared with other methods which show that ZnO/CPE-CV procedure is comparable to recently reported methods.

scholarly journals Cerium(IV) and Iron(III) Oxides Nanoparticles Based Voltammetric Sensor for the Sensitive and Selective Determination of Lipoic Acid

Sensors ◽  
2021 ◽  
Vol 21 (22) ◽  
pp. 7639
Author(s):  
Guzel Ziyatdinova ◽  
Liliya Gimadutdinova
Keyword(s):  
Lipoic Acid ◽  
Inorganic Ions ◽  
Fold Increase ◽  
Living Organism ◽  
Oxidation Potential ◽  
Acid Oxidation ◽  
Voltammetric Sensor ◽  
Pharmaceutical Dosage Forms ◽  
Selective Determination

A novel voltammetric sensor based on СеO2·Fe2O3 nanoparticles (NPs) has been developed for the determination of lipoic acid, playing an essential role in aerobic metabolism in the living organism. Sensor surface modification provides a 5.6-fold increase of the lipoic acid oxidation currents and a 20 mV anodic shift of the oxidation potential. The best voltammetric parameters have been obtained for the 0.5 mg mL−1 dispersion of СеO2·Fe2O3 NPs. Scanning electron microscopy (SEM) confirms the presence of spherical NPs of 25–60 nm, and their aggregates evenly distributed on the electrode surface and formed porous coverage. This leads to the 4.4-fold increase of the effective surface area vs. bare glassy carbon electrode (GCE). The sensor shows a significantly higher electron transfer rate. Electrooxidation of lipoic acid on СеO2·Fe2O3 NPs modified GCE is an irreversible diffusion-controlled pH-independent process occurring with the participation of two electrons. The sensor gives a linear response to lipoic acid in the ranges of 0.075–7.5 and 7.5–100 μM with the detection limit of 0.053 μM. The sensor is selective towards lipoic acid in the presence of inorganic ions, ascorbic acid, saccharides, and other S-containing compounds. The sensor developed has been tested on the pharmaceutical dosage forms of lipoic acid.

scholarly journals Voltammetric Characterization of the Behavior of Biologically Active Compound Enoxil in Various Media

2011 ◽  
Vol 6 (1) ◽  
pp. 62-68
Author(s):  
Gheorghe Nemţoi ◽  
Tudor Lupaşcu ◽  
Alexandra Ciomaga ◽  
Alexandru Cecal
Keyword(s):  
Sodium Perchlorate ◽  
Reduction Process ◽  
Oxidation Potential ◽  
Biologically Active ◽  
Aqueous Environment ◽  
Cathodic Current ◽  
Oxidation Reduction ◽  
Complex Preparation

This paper presents the results of scientific research related to the electrochemical behavior of the complex preparation Enoxil. It was established that the oxidation-reduction process of Enoxil is quasireversible. The reactivity of Enoxil obtained from alcohol soluble enotannins is more pronounced, compared to that obtained from standard enotannins. The dependence of cathodic current intensity on Enoxil concentration is linear. This can be used to establish Enoxil concentration in solution. Cyclic voltamograms were used to establish reduction and oxidation potential and the formal redox potential on platinum electrode in sodium perchlorate aqueous environment. These features can be used for identification and determination of Enoxil in pharmaceuticals.

scholarly journals Electrocatalytic Behavior and Determination of Amitriptyline Drug with MWCNT@Celllulose Composite Modified Glassy Carbon Electrode

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1708 ◽  
Author(s):  
Aftab Aslam Parwaz Khan
Keyword(s):  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Differential Pulse ◽  
Oxidation Potential ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Multiwalled Carbon ◽  
Peak Current ◽  
Thermal Investigations

A novel nanocomposite of cellulose based on multiwalled carbon nanotube (MWCNT) was synthesized by a simple solution mixing–evaporation method. The morphology, thermal investigations, electrocatalytic oxidation of amitriptyline were analyzed at multi-walled carbon/cellulose nanocomposite in detail. The amitriptyline (AMT) drug was electrochemically studied in a phosphate buffer at different pH using the MWCNT/cellulose modified glassy carbon electrode (GCE). As per the linear relationship among AMT along with peak current, differential pulse voltammetry technique has been established for their quantitative pharmaceutical’s determination. The oxidation potential shifted negatively compared to GCE, showing that the MWCNT/cellulose modified electrode had an excellent catalytic activity for the AMT oxidation. The anodic peak current varied linear response with AMT’s concentration in the range of 0.5 to 20.0 μM with a LOD of 0.0845 μM and LOQ of 0.282 μM, respectively. The proposed method was effectively put on the determination of AMT in pharmaceutical and urine samples. This novel methodology is presented here as an example of a complete development methodology for the determination of amitriptyline drug and sensor for use in healthcare fields.

scholarly journals Electrochemical Determination of Dopamine and Uric Acid Using Poly(proline) Modified Carbon Paste Electrode: A Cyclic Voltammetric Study

2021 ◽  
Vol 15 (2) ◽  
pp. 153-160
Author(s):  
Edwin S. D’ Souza ◽  
◽  
Jamballi G. Manjunatha ◽  
Chenthattil Raril ◽  
◽  
...  
Keyword(s):  
Uric Acid ◽  
Modified Electrode ◽  
Carbon Paste Electrode ◽  
Oxidation Potential ◽  
Modified Carbon Paste Electrode ◽  
Current Response ◽  
Carbon Paste ◽  
Cyclic Voltammetric ◽  
Paste Electrode

A cyclic voltammetric technique was used for electropolymerisation of proline on the surface of carbon paste electrode and for individual and concurrent determination of dopamine (DA) and uric acid (UA). The surface morphology of the developed electrode was studied by using field emission scanning electron microscopy. The modified electrode showed a high current response towards DA as compared to the bare electrode. The developed modified electrode shows good catalytic activity with a different oxidation potential of DA and UA. The electrode process was found to be adsorption controlled. The developed method shows very good stability and reproducibility. Under the optimized conditions, the concentration range is (1‒2)∙10-4 M and the observed detection limit was 4.7∙10-6 M. The developed sensor was applied for the determination of DA in the real sample with a good recovery.

scholarly journals Developing Activated Carbon Veil Electrode for Sensing Salivary Uric Acid

Biosensors ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 287
Author(s):  
Maria A. Bukharinova ◽  
Natalia Yu. Stozhko ◽  
Elizaveta A. Novakovskaya ◽  
Ekaterina I. Khamzina ◽  
Aleksey V. Tarasov ◽  
...  
Keyword(s):  
Uric Acid ◽  
Electrochemical Impedance ◽  
Linear Sweep Voltammetry ◽  
Cost Effective ◽  
Human Saliva ◽  
Charge Transfer Resistance ◽  
Oxidation Potential ◽  
Transfer Resistance ◽  
Highly Sensitive

The paper describes the development of a carbon veil-based electrode (CVE) for determining uric acid (UA) in saliva. The electrode was manufactured by lamination technology, electrochemically activated and used as a highly sensitive voltammetric sensor (CVEact). Potentiostatic polarization of the electrode at 2.0 V in H2SO4 solution resulted in a higher number of oxygen and nitrogen-containing groups on the electrode surface; lower charge transfer resistance; a 1.5 times increase in the effective surface area and a decrease in the UA oxidation potential by over 0.4 V, compared with the non-activated CVE, which was confirmed by energy dispersive X-ray spectroscopy, electrochemical impedance spectroscopy, chronoamperometry and linear sweep voltammetry. The developed sensor is characterized by a low detection limit of 0.05 µM and a wide linear range (0.09–700 µM). The results suggest that the sensor has perspective applications for quick determination of UA in artificial and human saliva. RSD does not exceed 3.9%, and recovery is 96–105%. UA makes a significant contribution to the antioxidant activity (AOA) of saliva (≈60%). In addition to its high analytical characteristics, the important advantages of the proposed CVEact are the simple, scalable, and cost-effective manufacturing technology and the absence of additional complex and time-consuming modification operations.

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