Determination of the Electrochemical Area of Screen-Printed Electrochemical Sensing Platforms

Ferrari, Alejandro García‐Miranda; Foster, Christopher W.; Kelly, Peter; Brownson, Dale A. C.; Banks, Craig E.

doi:10.3390/bios8020053

Cited by 266 publications

(96 citation statements)

References 37 publications

(35 reference statements)

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“…Cyclic voltammetry is known as an important tool to investigate the electrochemical behavior of various compounds and possible surface activity . For this reason, we have studied the electrochemical performance of unmodified and four modified electrodes including bare (PGE), pretreated PGE (pPGE), Chit/pPGE, SEP/pPGE and SEP/MWCNTs/pPGE.…”

Section: Resultsmentioning

confidence: 99%

Application of Single‐use Electrode Based on Nano‐clay and MWCNT for Simultaneous Determination of Acetaminophen, Ascorbic Acid and Acetylsalicylic Acid in Pharmaceutical Dosage

Bayraktepe

Yazan

2020

Electroanalysis

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In this study, a highly sensitive, selective and cost‐effective electrochemical nano‐sensor has been developed for the first time so as to facilitate the simultaneous and low‐level detection of acetaminophen (paracetamol, PAR), ascorbic acid (A) and acetylsalicylic acid (ASA) ternary mixture. The sensor is based on nano‐sepiolite clay (SEP) with multiwall carbon nanotubes (MWCNTs) onto electrochemically pretreated pencil graphite electrode (pPGE). The surface properties of the sensor were examined by using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM) techniques. The pH effect, composition of modifiers, immobilization time, deposition potential and deposition time values were optimized to reach the best response of PAR, A and ASA. Moreover, in optimum analytical conditions, adsorptive stripping differential pulse voltammmetric (AdsDPV) method was developed for the simultaneous analysis of the ternary mixtures concerned by using SEP/MWCNTs/pPGE sensor. This sensor exhibited the low detection limits of 0.018, 0.042 and 0.047 μM for PAR, A and ASA ternary mixture, respectively. The developed AdsDPV method was applied for quantitative determination of PAR, A and ASA in the pharmaceutical formulation. The recovery experiments were carried out to control the accuracy and precision of the method. The obtained voltammetric recoveries were comparable with the HPLC data given in the literature.

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Section: Resultsmentioning

confidence: 99%

Application of Single‐use Electrode Based on Nano‐clay and MWCNT for Simultaneous Determination of Acetaminophen, Ascorbic Acid and Acetylsalicylic Acid in Pharmaceutical Dosage

Bayraktepe

Yazan

2020

Electroanalysis

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“…The quantitative evaluation of the electrochemically active area of AuNP/SPGE and SPGE was performed by cyclic voltammetry at different scan rates using potassium ferricyanide and ruthenium hexamine as redox probes. The electrochemically active area was determined based on Randles‐Ševcik equation, using diffusion coefficient values of D=7.26×10 −6 cm 2 /s and D=9.1×10 −6 cm 2 /s for K 4 [Fe(CN) 6 ] and [Ru(NH 3 ) 6 ]Cl 3 , respectively. Compared to the geometric area of 0.126 cm 2 , the electrochemically active area of the SPGE electrodes determined experimentally was 0.058±0.006 cm 2 and 0.078±0.004 cm 2 (n=3 electrodes) with K 4 [Fe(CN) 6 ] and [Ru(NH 3 ) 6 ]Cl 3 , respectively.…”

Section: Resultsmentioning

confidence: 99%

Detection of Allergenic Lysozyme during Winemaking with an Electrochemical Aptasensor

Titoiu

Porumb²,

Fanjul‐Bolado

et al. 2019

Electroanalysis

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In this work we investigate the performance of a simple, disposable electrochemical aptasensor for lysozyme and its usefulness for monitoring the allergen risk along wine production. The sensor relies on screen‐printed gold electrodes modified with gold nanoparticles as the electrochemical transducer, with detection by cyclic voltammetry. This simple method is characterized by a detection limit of 0.32 μg.mL−1 lysozyme and a linear range of 1–10 μg.mL−1, being appropriate for the analysis of lysozyme‐treated wines. Several white wines where sulphur dioxide was partially replaced by lysozyme were produced and analyzed with the aptasensor at critical stages during wine production. The results obtained with the aptasensor were moreover compared with those recorded in parallel by a standard method, high performance liquid chromatography (HPLC). The specific advantages brought by the use of nanomaterial and the limitations of the sensor are discussed. The sensor allowed evaluating the effect of various technological steps along wine production on the content of lysozyme.

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“…[1] Additionally, as discussed in the previous paragraph, the RandlesÀ Ševčík equation could be used to calculate the A real for non-nanometric materials or more flat surfaces, and it is reported in the literature. [8] However, other important factors (eight factors), and then the time-dependence of the RandlesÀ Ševčík, have to be considered. Another critical point to highlight about the correct use of the RandlesÀ Ševčík equation is related to the diffusion layer overlapping when using micro-and nanoparticles, [9] as the RandlesÀ Ševčík equation is exclusively one-dimensional diffusional mass transport [10] and radial diffusion is not taken into account.…”

Section: Measuring Electrochemical Surface Area Of Nanomaterials Versmentioning

confidence: 99%

Measuring Electrochemical Surface Area of Nanomaterials versus the Randles−Ševčík Equation

Paixão

2020

ChemElectroChem

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This Viewpoint article is to call the attention of the nanomaterials community to a standard error when using the Randles−Ševčík equation to calculate the electrode surface area, as this error is continuously reported in the literature and the idea is to complete the conversation about the critical discussion based on the duality of electrocatalytic performance of nanomaterials and surface area in order to understand the electrocatalytic effect of these materials and not to simply attribute the current enhancement on the basis of an increase in surface area.

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Determination of the Electrochemical Area of Screen-Printed Electrochemical Sensing Platforms

Cited by 266 publications

References 37 publications

Application of Single‐use Electrode Based on Nano‐clay and MWCNT for Simultaneous Determination of Acetaminophen, Ascorbic Acid and Acetylsalicylic Acid in Pharmaceutical Dosage

Application of Single‐use Electrode Based on Nano‐clay and MWCNT for Simultaneous Determination of Acetaminophen, Ascorbic Acid and Acetylsalicylic Acid in Pharmaceutical Dosage

Detection of Allergenic Lysozyme during Winemaking with an Electrochemical Aptasensor

Measuring Electrochemical Surface Area of Nanomaterials versus the Randles−Ševčík Equation

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