Basic principles of voltammetry

Fischer, Ö.; Fischerová, E

doi:10.1007/978-3-0348-7607-0_2

Cited by 6 publications

(6 citation statements)

References 182 publications

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“…The electrodeposited MoS 2 allows decreasing the oxidation peak potential of UA from 0.45 to 0.25 V Ag/AgCl ( Figure 3 a). A smaller half peak width at the MoS 2 electrode (112 mV vs. 168 mV at the bare gold) indicates a greater electrochemical reversibility of UA oxidation due to the enhanced mass transport [ 50 ]. The LoD values are above the biological concentration range of the analyte with the bare electrode and are within the biological concentration range of the analyte for the MoS 2 -modified electrode ( Table S4 ).…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Determination of Hydroxyurea in a Complex Biological Matrix Using MoS2-Modified Electrodes and Chemometrics

et al. 2020

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Hydroxyurea, an oral medication with important clinical benefits in the treatment of sickle cell anemia, can be accurately determined in plasma with a transition metal dichalcogenide-based electrochemical sensor. We used a two-dimensional molybdenum sulfide material (MoS2) selectively electrodeposited on a polycrystalline gold electrode via tailored waveform polarization in the gold electrical double layer formation region. The electro-activity of the modified electrode depends on the electrical waveform parameters used to electro-deposit MoS2. The concomitant oxidation of the MoS2 material during its electrodeposition allows for the tuning of the sensor’s specificity. Chemometrics, utilizing mathematical procedures such as principal component analysis and multivariable partial least square regression, were used to process the electrochemical data generated at the bare and the modified electrodes, thus allowing the hydroxyurea concentrations to be predicted in human plasma. A limit-of-detection of 22 nM and a sensitivity of 37 nA cm−2 µM−1 were found to be suitable for pharmaceutical and clinical applications.

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Section: Resultsmentioning

confidence: 99%

Electrochemical Determination of Hydroxyurea in a Complex Biological Matrix Using MoS2-Modified Electrodes and Chemometrics

et al. 2020

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“…The voltammetric methods comprise of the combination of voltage that is applied across the electrolytic cell which is assembled with three electrodes dipped into an electrolytic solution and measurement of current. [45] The basic principle regarding the potential sweep electrochemical techniques involve the measurement and study of the current responses of the chemical species under consideration by varying the potential across the electrodes. The current responses are produced due to the transfer of electrons between the electroactive species and the working electrode.…”

Section: Voltammetrymentioning

confidence: 99%

Voltammetric Sensors: A Versatile Tool in COVID‐19 Diagnosis and Prognosis

2023

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The recent events of outbreaks of corona virus caused by the Severe Acute Respiratory Syndrome Coronavirus −2(SARS‐CoV‐2) raised a concern and increased urge for quick and rapid detection techniques of disease causing pathogens. The detection of the virus with high sensitivity and accuracy holds great importance. Nowadays, the most commonly employed technique is the Quantitative Reverse Transcription Polymerase Chain Reaction test (qRT‐PCR) and antigen test. While RT‐PCR technique is time consuming, expensive and labour intensive, antigen tests though simple, can often give false positive and false negatives. In this context, electrochemical biosensors developed in recent times have been identified as a potential strategy to overcome the limitations of these common techniques. This review article summarizes the current advancements in the field of voltammetric sensors for the detection of COVID‐19 virus and various biomarkers associated with it.

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“…[37] In other way, voltammetry signifies the process of forcing current through an electrochemical cell and record the corresponding potential response (i.e., the potential between the reference electrode and the working electrode). [37] On the other hand, coulometry is the method, where the amount of charges in the redox conversion of an analyte at a working electrode is measured, the techniques monitor the quantity of electricity (the number of coulombs) that are changed during an electrochemical reaction involves the analyte. [38] The adopted sensing strategies, in addition to the electrochemical, chemical, and physical aspects of the electrode materials, play important roles in the selective and sensitive detection of sulfide in various media using controlled-potential techniques.…”

Section: P E R S O N a L A C C O U N T T H E C H E M I C A L R E C O R Dmentioning

confidence: 99%

“…Amperometry monitors electric current (in amperes) while keeping the potential constant, the technique involves the application of a constant oxidizing or reducing the potential to a working electrode and the subsequently measured the resulting current [36] . In voltammetry, the potential is varied in a regular manner while the current is monitored, (i.e., with the measurement of electric current flowing through the cell) [37] . In other way, voltammetry signifies the process of forcing current through an electrochemical cell and record the corresponding potential response (i.e., the potential between the reference electrode and the working electrode) [37] .…”

Section: Introductionmentioning

confidence: 99%

“…In voltammetry, the potential is varied in a regular manner while the current is monitored, (i.e., with the measurement of electric current flowing through the cell) [37] . In other way, voltammetry signifies the process of forcing current through an electrochemical cell and record the corresponding potential response (i.e., the potential between the reference electrode and the working electrode) [37] . On the other hand, coulometry is the method, where the amount of charges in the redox conversion of an analyte at a working electrode is measured, the techniques monitor the quantity of electricity (the number of coulombs) that are changed during an electrochemical reaction involves the analyte [38] .…”

Section: Introductionmentioning

confidence: 99%

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Controlled‐Potential‐Based Electrochemical Sulfide Sensors: A Review

Shah

Aziz

Oyama

et al. 2020

The Chemical Record

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Due to their potential applications in industry and potent toxicity to the environment, sulfides and their detection have attracted the attention of researchers. To date, a large number of controlled‐potential techniques for electrochemical sulfide sensors have been developed, thanks to their simplicity, reasonable limit of detection (LOD), and good selectivity. Different researchers have applied different strategies for developing selective and sensitive sulfide sensors. However, there has been no systematic review on controlled‐potential techniques for sulfide sensing. In light of this absence, the main aim of this review article is to summarize various strategies for detecting sulfide in different media. The efficiencies of the developed sulfide sensors for detecting sulfide in its various forms are determined, and the essential parameters, including sensing strategies, working electrodes, detection media, pH, LOD, sensitivity, and linear detection range, are emphasized in particular. Future research in this area is also recommended. It is expected that this review will act as a basis for further research on the fabrication of sulfide sensors for practical applications.

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Basic principles of voltammetry

Cited by 6 publications

References 182 publications

Electrochemical Determination of Hydroxyurea in a Complex Biological Matrix Using MoS2-Modified Electrodes and Chemometrics

Electrochemical Determination of Hydroxyurea in a Complex Biological Matrix Using MoS2-Modified Electrodes and Chemometrics

Voltammetric Sensors: A Versatile Tool in COVID‐19 Diagnosis and Prognosis

Controlled‐Potential‐Based Electrochemical Sulfide Sensors: A Review

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