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 Cyclic Voltammetric Investigation of Caffeine at Anthraquinone Modified Carbon Paste Electrode

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Yemane Tadesse ◽  
Abraha Tadese ◽  
R. C. Saini ◽  
Rishi Pal
Keyword(s):  
Modified Electrode ◽  
Carbon Paste Electrode ◽  
Low Cost ◽  
Modified Carbon Paste Electrode ◽  
Good Recovery ◽  
Carbon Paste ◽  
Cyclic Voltammetric ◽  
Anodic Peak Current ◽  
Paste Electrode

Electrochemical methods have been widely used for the determination of electroactive compounds due to their simplicity, sensitivity, stability, and low cost. A carbon paste electrode was modified with anthraquinone. Cyclic voltammetry (CV) was employed to study the properties of the modified electrode toward the oxidation of caffeine (CAF). Compared to the unmodified electrode, the AQMCPE showed excellent catalytic activity for the oxidation of caffeine. AQMCPE was used to determine CAF in drug samples electrochemically. SWV was used to plot the calibration curve and there was a good linear relationship between anodic peak current and CAF concentration in the range2.0×10-6-8.0×10–4 M, with the correlation coefficient of 0.998 and a detection limit of1.43×10-7 M. The application of the modified electrode for the determination of CAF in pharmaceutical formulation showed good recovery with reproducible results.

Electrochemical determination of vitamin C in the presence of uric acid by a novel TiO2 nanoparticles modified carbon paste electrode

2010 ◽  
Vol 21 (12) ◽  
pp. 1471-1474 ◽  
Author(s):  
Mohammad Mazloum-Ardakani ◽  
Mohammad Ali Sheikh-Mohseni ◽  
Hadi Beitollahi ◽  
Ali Benvidi ◽  
Hossein Naeimi
Keyword(s):  
Uric Acid ◽  
Vitamin C ◽  
Tio2 Nanoparticles ◽  
Carbon Paste Electrode ◽  
Electrochemical Determination ◽  
Modified Carbon Paste Electrode ◽  
Carbon Paste ◽  
Paste Electrode

Selective determination of dopamine and uric acid using electrochemical sensor based on poly(alizarin yellow R) film-modified electrode

2014 ◽  
Vol 6 (10) ◽  
pp. 3474-3481 ◽  
Author(s):  
Yuanzhen Zhou ◽  
Weimin Tang ◽  
Jing Wang ◽  
Guo Zhang ◽  
Shouning Chai ◽  
...  
Keyword(s):  
Uric Acid ◽  
Carbon Paste Electrode ◽  
Modified Carbon Paste Electrode ◽  
Carbon Paste ◽  
Selective Method ◽  
Selective Determination ◽  
Alizarin Yellow ◽  
Alizarin Yellow R ◽  
Paste Electrode

A sensitive and selective method based on a poly(alizarin yellow R)-modified carbon paste electrode (PAYR/CPE) to detect dopamine (DA) and uric acid (UA) was successfully established.

scholarly journals Electrochemical determination of atenolol and propranolol using a carbon paste sensor modified with natural ilmenite

2021 ◽  
Vol 19 (1) ◽  
pp. 875-883
Author(s):  
Nevila Broli ◽  
Majlinda Vasjari ◽  
Loreta Vallja ◽  
Sonila Duka ◽  
Alma Shehu ◽  
...  
Keyword(s):  
Carbon Paste Electrode ◽  
Beta Blockers ◽  
High Sensitivity ◽  
Modified Carbon Paste Electrode ◽  
Current Response ◽  
Carbon Paste ◽  
Linear Calibration ◽  
Pharmaceutical Tablets ◽  
Paste Electrode

Abstract In this study, a simple voltammetric method was reported for independent determination of propranolol (PROP) and atenolol (ATN) in pharmaceutical tablets using carbon paste electrode modified with natural Ilmenite (CPE-I). The analytical performance of the modified sensor was evaluated using the square wave voltammetry and cyclic voltammetry for determination of both β(beta) blockers in 0.1 mol L−1 of sulfuric acid solution (H2SO4). The signal obtained with modified carbon paste electrode in 0.1 mol L−1 of H2SO4 showed a good electrocatalytic activity toward the oxidations of PROP and ATN compared with the bare one. The enhanced oxidation peak current response can be attributed to the catalytic effect of the ilmenite nanomaterial incorporated into the carbon paste electrode. Under optimal condition, good linear calibration curves were obtained ranging from 0.20 to 8.9 mmol L−1 for PROP and 2.0 to 9.9 µmol L−1 for ATN, with detection limits of 80 and 0.31 µmol L−1, respectively. The CPE-I sensor had good repeatability and reproducibility (RSD ≤ 3.2%) and high sensitivity for the detection of both ATN and PROP. The proposed sensor was applied for detection of these drugs in pharmaceutical tablets. The obtained results indicate that the voltammetric CPE-I sensor could be an alternative method for the routine quality control of the β blockers in complex matrices.

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