Disposable Pencil Graphite Electrode for Ciprofloxacin Determination in Pharmaceutical Formulations by Square Wave Voltammetry

2020 ◽  
Author(s):  
Guilherme Figueira Alves ◽  
Thalles Pedrosa Lisboa ◽  
Lucas Vinícius Faria ◽  
Davi Marques Farias ◽  
Maria Auxiliadora Costa Matos ◽  
...  
Keyword(s):  
Square Wave Voltammetry ◽  
Graphite Electrode ◽  
Pharmaceutical Formulations ◽  
Pencil Graphite Electrode ◽  
Square Wave ◽  
Wave Voltammetry

Square-Wave Voltammetry of Decamethylferrocene at the Three-Phase Junction Organic Liquid/Aqueous Solution/Graphite

2001 ◽  
Vol 66 (3) ◽  
pp. 434-444 ◽  
Author(s):  
Šebojka Komorsky-Lovrić ◽  
Milivoj Lovrić ◽  
Fritz Scholz
Keyword(s):  
Aqueous Solution ◽  
Linear Relationship ◽  
Square Wave Voltammetry ◽  
Aqueous Electrolyte ◽  
Graphite Electrode ◽  
Organic Liquid ◽  
Aqueous Electrolytes ◽  
Square Wave ◽  
Wave Voltammetry ◽  
Three Phase

Drops of nitrobenzene and 1,2-dichloroethane with 0.1 M decamethylferrocene (dmfc) are attached to the surface of a paraffin-impregnated graphite electrode and immersed into various aqueous electrolytes. The oxidation of dmfc and the reduction of dmfc+ cation are enabled by simultaneous transfers of anions between the aqueous electrolyte and the organic solvents. Square-wave voltammetry of this reaction is reported. A linear relationship was observed between the peak potentials of dmfc and the standard Galvani potential differences of the anions. The influence of the anion concentration on this relation is explained.

Simultaneous Determination of Amlodipine and Irbesartan in Their Pharmaceutical Formulations by Square-Wave Voltammetry

2021 ◽  
Vol 24 ◽  
Author(s):  
İsmail Murat Palabıyık ◽  
Aysegul Dogan ◽  
İncilay Süslü
Keyword(s):  
Simultaneous Determination ◽  
Square Wave Voltammetry ◽  
Limit Of Detection ◽  
Pharmaceutical Formulations ◽  
Amlodipine Besylate ◽  
Square Wave ◽  
Wave Voltammetry ◽  
Limit Of Quantitation ◽  
Active Substances

Background: Hypertension is one of the most important health problems in the world and irbesartan and amlodipine are used in combination in various dosages for the treatment of high blood pressure. Objective: The aim of this study is to develop a fast, easy, sensitive, accurate, and precise square-wave voltammetry method for simultaneous determination of irbesartan and amlodipine besylate from pharmaceutical formulations at a hanging mercury drop electrode. Methods: In the applied method, since both active substances gave a peak at different potentials, no interference occurred between them. In optimization studies Britton-Robinson buffer of pH 8.0 was chosen, in which the most appropriate peak shape and maximum peak current were observed. At the same time, as a result of instrumental parameter optimization to obtain reproducible results, 6 mV for scan increment, 30 mV for pulse amplitude, and 50 Hz for frequency were found suitable. Results: As a result of the calibration studies of the optimized method, linear working ranges were determined as 1.00-13.08 µg mL-1 for irbesartan and 5.83-16.51 µg mL-1 for amlodipine besylate. Limit of detection and limit of quantitation values were respectively calculated as 0.63 and 1.00 µg mL-1 for irbesartan and 0.50 and 1.98 µg mL-1 for amlodipine besylate. The results of precision values (RSD) ranged from 0.67% to 2.31% for irbesartan and 0.65% to 1.49% for amlodipine besylate. Accuracy values were calculated as -0.15% to 1.63% for irbesartan and -0.07% to 3.78% for amlodipine besylate. The results obtained from the recovery studies ranged from 101.05% to 102.78% and from 98.88% to 102.20% for amlodipine besylate and irbesartan, respectively. Conclusion: After the validation studies of the developed method were carried out, it was successfully applied to pharmaceutical formulations containing these active substances.

Oxidation of Protopine at a Pyrolytic Graphite Electrode Using Cyclic and Square-Wave Voltammetry

2010 ◽  
Vol 22 (24) ◽  
pp. 2879-2883 ◽  
Author(s):  
Eva Vrublová ◽  
Jitka Ulrichová ◽  
Vilím Šimánek ◽  
Miroslav Fojta ◽  
Jan Vacek
Keyword(s):  
Square Wave Voltammetry ◽  
Graphite Electrode ◽  
Pyrolytic Graphite ◽  
Square Wave ◽  
Wave Voltammetry ◽  
Pyrolytic Graphite Electrode

scholarly journals Determination of 5-aminosalicylic acid in pharmaceutical formulations by square wave voltammetry at pencil graphite electrodes

Química Nova ◽  
2010 ◽  
Vol 33 (4) ◽  
pp. 964-967 ◽  
Author(s):  
Carolina V. Uliana ◽  
Hideko Yamanaka ◽  
Gustavo S. Garbellini ◽  
Giancarlo R. Salazar-Banda
Keyword(s):  
Square Wave Voltammetry ◽  
Pharmaceutical Formulations ◽  
Aminosalicylic Acid ◽  
Graphite Electrodes ◽  
Square Wave ◽  
Wave Voltammetry
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