Theory of differential normal pulse voltammetry in the alternating pulse mode for totally irreversible electrode reactions

Brumleve, Timothy R.; Osteryoung, Janet

doi:10.1021/ac00230a015

Cited by 31 publications

(11 citation statements)

References 17 publications

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“…However, the theoretical width of the DPV response for a slow transfer can increase to ca. two-fold [40], as also seen for GCE (87 mV) and PMB DES /GCE (125 mV). Therefore, considering the ∆E/∆pH slope values and W 1/2 , it was concluded that 5-ASA oxidation occurs with a two electron and two proton transfer, as also found in other 5-ASA reported papers [41,42].…”

Section: Resultssupporting

confidence: 72%

Hybrid Nanocomposite Platform, Based on Carbon Nanotubes and Poly(Methylene Blue) Redox Polymer Synthesized in Ethaline Deep Eutectic Solvent for Electrochemical Determination of 5-Aminosalicylic Acid

Hosu

Bârsan

Săndulescu

et al. 2021

Sensors

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A novel hybrid composite of conductive poly(methylene blue) (PMB) and carbon nanotubes (CNT) was prepared for the detection of 5-aminosalicylic acid (5-ASA). Electrosynthesis of PMB with glassy carbon electrode (GCE) or with carbon nanotube modified GCE was done in ethaline deep eutectic solvent of choline chloride mixed with ethylene glycol and a 10% v/v aqueous solution. Different sensor architectures were evaluated in a broad range of pH values in a Britton-Robinson (BR) buffer using electrochemical techniques, chronoamperometry (CA), and differential pulse voltammetry (DPV), to determine the optimum sensor configuration for 5-ASA sensing. Under optimal conditions, the best analytical performance was obtained with CNT/PMBDES/GCE in 0.04 M BR buffer pH 7.0 in the range 5–100 µM 5-ASA using the DPV method, with an excellent sensitivity of 9.84 μA cm−2 μM−1 (4.9 % RSD, n = 5) and a detection limit (LOD) (3σ/slope) of 7.7 nM, outclassing most similar sensors found in the literature. The sensitivity of the same sensor obtained in CA (1.33 μA cm−2 μM−1) under optimal conditions (pH 7.0, Eapp = +0.40 V) was lower than that obtained by DPV. Simultaneous detection of 5-ASA and its analogue, acetaminophen (APAP), was successfully realized, showing a catalytic effect towards the electro-oxidation of both analytes, lowering their oxidation overpotential, and enhancing the oxidation peak currents and peak-to-peak separation as compared with the unmodified electrode. The proposed method is simple, sensitive, easy to apply, and economical for routine analysis.

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Section: Resultssupporting

confidence: 72%

Hybrid Nanocomposite Platform, Based on Carbon Nanotubes and Poly(Methylene Blue) Redox Polymer Synthesized in Ethaline Deep Eutectic Solvent for Electrochemical Determination of 5-Aminosalicylic Acid

Hosu

Bârsan

Săndulescu

et al. 2021

Sensors

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show abstract

“…According to Barker and Gardner [54] and Osteryoung et al [55,56], the width W 1/2 of the square wave voltammogram peak at half its height depends on the number of electrons transferred, n and temperature by the following relation:…”

Section: Analysis Of Peaksmentioning

confidence: 99%

Electrochemical studies on the redox behaviour of zirconium in molten LiCl–KCl eutectic

Ghosh

Vandarkuzhali

Venkatesh

et al. 2009

Journal of Electroanalytical Chemistry

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“…150 mV, for a slow transfer. 37 Thus it appears that the transfer rate increases in the diluted solutions. The peak current is essentially linear in the 10 À6 M to 10 À4 M concentration range (Fig.…”

Section: Differential Pulse Voltammetrymentioning

confidence: 99%

Voltammetric responses at modified electrodes and aggregation effects of two anticancer molecules: irinotecan and sunitinib

2020

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Theory of differential normal pulse voltammetry in the alternating pulse mode for totally irreversible electrode reactions

Cited by 31 publications

References 17 publications

Hybrid Nanocomposite Platform, Based on Carbon Nanotubes and Poly(Methylene Blue) Redox Polymer Synthesized in Ethaline Deep Eutectic Solvent for Electrochemical Determination of 5-Aminosalicylic Acid

Hybrid Nanocomposite Platform, Based on Carbon Nanotubes and Poly(Methylene Blue) Redox Polymer Synthesized in Ethaline Deep Eutectic Solvent for Electrochemical Determination of 5-Aminosalicylic Acid

Electrochemical studies on the redox behaviour of zirconium in molten LiCl–KCl eutectic

Voltammetric responses at modified electrodes and aggregation effects of two anticancer molecules: irinotecan and sunitinib

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