Recent Advances and Prospects of Square-Wave Voltammetry

Mirčeski, Valentin; Stojanov, Leon; Skrzypek, Sławomira

doi:10.20903/csnmbs.masa.2018.39.2.123

Cited by 8 publications

(9 citation statements)

References 66 publications

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“…As shown the above figure, two completely resolved peaks are observed at activated glassy carbon electrode and the E p of uric acid was observed at positive potential ( ̴ 25 mV) with activated glassy carbon electrode also the potential peak to separation of the two analytes were 90 mV. The well-defined peak of paracetamol was obtained at activated glassy carbon electrode with good peak separation from Uric acid [12,28,35]. Generally, the above voltammogram was observed that Uric acid affect peak current for paracetamol compared with paracetamol without Uric acid under the potential range used (i.e decrease the peak current and causes to the broadness of the peak of paracetamol), but do not affect the peak potential of paracetamol.…”

Section: Interference Study On the Behaviour Of Paracetamolmentioning

confidence: 75%

Differential Pulse Voltammetric Determination of Paracetamol Using Activated Glassy Carbon Electrode

Ayalew¹,

Ayitegeb²

2021

AJPC

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The electrochemical property of paracetamol was investigated at a glassy carbon electrode and activated glassy carbon electrode. Differential pulse voltammetry and cyclic voltammetry were used as diagnostic techniques in the determination of paracetamol. The activated glassy carbon electrode exhibited excellent electro-catalytic behaviour for the oxidation of PAR as evidenced by the enhancement of the oxidation peak current and the shift in the oxidation peak potential to less positive values by (13mv) in comparison with a bare GCE. In the present work the activated glassy carbon electrode was prepared by activating 200 s in a time base technique at a potential of 1750 mV. The electrode process of paracetamol was studied and some the experimental parameters which affect the response paracetamol, such as pH, effect of PAR concentration and scan rate on AGC electrode. The analysis of cyclic voltammogram gave fundamental electrochemical parameters including the electroactive surface coverage, the electron transfer coefficient and the heterogeneous rate constant (k s ). The variation of scan rate study shows that the system undergoes adsorption controlled process. The equation of the calibration curve was found to be: I p =0.429C + 6.43, R 2 =0.993. The LOD and LOQ for the developed method were determined to be 8×10 -8 mol L -1 and 2.6×10 -7 mol L -1 respectively. Phosphate buffer pH 7.0 was selected for analytical purpose.

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Section: Interference Study On the Behaviour Of Paracetamolmentioning

confidence: 75%

Differential Pulse Voltammetric Determination of Paracetamol Using Activated Glassy Carbon Electrode

Ayalew¹,

Ayitegeb²

2021

AJPC

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“…The benefits of voltammetric techniques reside in their marvelous sensitivity, quick analysis, concurrent detection of different analytes, generation of different potential waveforms, small current measurements and determination of kinetic parameters. Voltammetric biosensing methods can be based on polarographic, stripping voltammetric, linear scan or sweep voltammetric, differential pulse voltammetric (DPV), normal pulse voltammetric (NPV) or CV measurements [255][256][257][258][259].…”

Section: Voltammetric Gqd-sensorsmentioning

confidence: 99%

“…The SWV excitation response constitutes a defined symmetry like a 'staircase pattern' (Figure 15B). SWV is a widely used method, because its advantages lie in providing excellent sensitivity and increased signal/noise ratio [258,259]. Moreover, the typical SWV peak right from the electrode functionalization to the target detection is displayed in Figure 15C.…”

Section: Voltammetric Gqd-sensorsmentioning

confidence: 99%

Applications of Graphene Quantum Dots in Biomedical Sensors

Mansuriya

Altıntaş

2020

Sensors

190

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Due to the proliferative cancer rates, cardiovascular diseases, neurodegenerative disorders, autoimmune diseases and a plethora of infections across the globe, it is essential to introduce strategies that can rapidly and specifically detect the ultralow concentrations of relevant biomarkers, pathogens, toxins and pharmaceuticals in biological matrices. Considering these pathophysiologies, various research works have become necessary to fabricate biosensors for their early diagnosis and treatment, using nanomaterials like quantum dots (QDs). These nanomaterials effectively ameliorate the sensor performance with respect to their reproducibility, selectivity as well as sensitivity. In particular, graphene quantum dots (GQDs), which are ideally graphene fragments of nanometer size, constitute discrete features such as acting as attractive fluorophores and excellent electro-catalysts owing to their photo-stability, water-solubility, biocompatibility, non-toxicity and lucrativeness that make them favorable candidates for a wide range of novel biomedical applications. Herein, we reviewed about 300 biomedical studies reported over the last five years which entail the state of art as well as some pioneering ideas with respect to the prominent role of GQDs, especially in the development of optical, electrochemical and photoelectrochemical biosensors. Additionally, we outline the ideal properties of GQDs, their eclectic methods of synthesis, and the general principle behind several biosensing techniques.

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“…Voltammetric sensing techniques include cyclic voltammetry, linear sweep/scan voltammetry, differential pulse voltammetry, square wave voltammetry, polarography, and stripping voltammetry. A two-or three-electrode electrochemical sensor containing a potentiostat can be employed to measure the current [95][96][97][98][99].…”

Section: Voltammetric Sensorsmentioning

confidence: 99%

“…The peak height is directly proportional to the concentration of the electroactive species. SWV exhibits excellent sensitivity, ignores background currents, and enhances the signal to noise ratio [98,99]. Figure 5E depicts the SWV response with respect to the different steps tangled from the electrode modification to the analyte determination.…”

Section: Voltammetric Sensorsmentioning

confidence: 99%

Graphene Quantum Dot-Based Electrochemical Immunosensors for Biomedical Applications

Mansuriya

Altıntaş

2019

Materials

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In the area of biomedicine, research for designing electrochemical sensors has evolved over the past decade, since it is crucial to selectively quantify biomarkers or pathogens in clinical samples for the efficacious diagnosis and/or treatment of various diseases. To fulfil the demand of rapid, specific, economic, and easy detection of such biomolecules in ultralow amounts, numerous nanomaterials have been explored to effectively enhance the sensitivity, selectivity, and reproducibility of immunosensors. Graphene quantum dots (GQDs) have garnered tremendous attention in immunosensor development, owing to their special attributes such as large surface area, excellent biocompatibility, quantum confinement, edge effects, and abundant sites for chemical modification. Besides these distinct features, GQDs acquire peroxidase (POD)-mimicking electro-catalytic activity, and hence, they can replace horseradish peroxidase (HRP)-based systems to conduct facile, quick, and inexpensive label-free immunoassays. The chief motive of this review article is to summarize and focus on the recent advances in GQD-based electrochemical immunosensors for the early and rapid detection of cancer, cardiovascular disorders, and pathogenic diseases. Moreover, the underlying principles of electrochemical immunosensing techniques are also highlighted. These GQD immunosensors are ubiquitous in biomedical diagnosis and conducive for miniaturization, encouraging low-cost disease diagnostics in developing nations using point-of-care testing (POCT) and similar allusive techniques.

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Recent Advances and Prospects of Square-Wave Voltammetry

Cited by 8 publications

References 66 publications

Differential Pulse Voltammetric Determination of Paracetamol Using Activated Glassy Carbon Electrode

Differential Pulse Voltammetric Determination of Paracetamol Using Activated Glassy Carbon Electrode

Applications of Graphene Quantum Dots in Biomedical Sensors

Graphene Quantum Dot-Based Electrochemical Immunosensors for Biomedical Applications

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