Electrocatalytic characteristics of ascorbic acid oxidation at nickel plated aluminum electrodes modified with nickel pentacyanonitrosylferrate films

Pournaghi-Azar, M.H.; Razmi-Nerbin, H.

doi:10.1016/s0022-0728(00)00171-6

Cited by 130 publications

(65 citation statements)

References 19 publications

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“…For scan rates above 150 mV s -1 , a small decrease in the anodic peak current was observed, indicating the existence of kinetic limitation in the electrochemical reaction between [(VO 3+ (Salen)] and dipyrone for higher scan rates. 23 From these results, a scan rate of 25 mV s -1 was chosen for further studies since it results in voltammograms with better peak definition.…”

Section: Methodsmentioning

confidence: 99%

Voltammetric determination of dipyrone using a N,N'-ethylenebis(salicylideneaminato)oxovanadium(IV) modified carbon-paste electrode

Teixeira¹,

Marcolino‐Júnior²,

Fatibello‐Filho³

et al. 2004

J. Braz. Chem. Soc.

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A preparação e a caracterização eletroquímica de um eletrodo de pasta de carbono modificado com o complexo N, N´-etilenobis(salicilidenoaminato) de oxovanádio(IV) ([VO(Salen)]), como também o seu comportamento eletrocatalítico na oxidação da dipirona foi investigado. O comportamento eletroquímico do eletrodo modificado e a eletrooxidação da dipirona foram estudados usando a voltametria cíclica. A resposta voltamétrica do eletrodo modificado é baseada em duas reações. Uma relacionada com a oxidação eletroquímica do centro metálico do complexo [VO(Salen)] e a outra que envolve o processo redox entre centro metálico do complexo oxidado e a dipirona. A melhor resposta voltamétrica foi observada para uma composição do eletrodo de 25% (m/m) [VO(Salen)] em solução eletrolítica de KCl para pH entre 5,5 a 8,0 e uma velocidade de varredura de 10 mV s -1 na presença de dipirona. Uma resposta voltamétrica linear para dipirona foi obtida no intervalo de concentração de 9,9 x 10 -6 a 2,8 x 10 -4 mol L -1 , com um limite de detecção de 7,2 x 10 -6 mol L -1 . Entre os diversos compostos testados como interferente, somente o ácido ascórbico apresentou alguma interferência. O eletrodo proposto é útil para o controle de qualidade e a análise rotineira de dipirona em formulações farmacêuticas.The preparation and electrochemical characterization of a carbon paste electrode modified with N,N'-ethylenebis(salicylideneiminato)oxovanadium(IV) complex ([VO(Salen)]) as well as its behavior as electrocatalyst toward the oxidation of dipyrone were investigated. The electrochemical behavior of the modified electrode and the electrooxidation of dipyrone were explored using cyclic voltammetry. The voltammetric response of the modified electrode is based on two reactions. One electrochemical related to the oxidation of the metallic center of the [VO(Salen)] and the other involving the chemical redox process involving the oxidized form of the complex and the reduced form of dipyrone. The best voltammetric response was observed for a paste composition of 25% (m/m) [VO(Salen)], KCl solution pH from 5.5 to 8.0 as the electrolyte and potential scan rate of 10 mV s -1 in the presence of dipyrone. A linear voltammetric response for dipyrone was obtained in the concentration range from 9.9 x 10 -6 to 2.8 x 10 -3 mol L -1 , with a detection limit of 7.2 x 10 -6 mol L -1 . Among of several compounds tested as potential interference, only ascorbic acid presented some interference. The proposed electrode is useful for the quality control and routine analysis of dipyrone in pharmaceutical formulations.

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Section: Methodsmentioning

confidence: 99%

Voltammetric determination of dipyrone using a N,N'-ethylenebis(salicylideneaminato)oxovanadium(IV) modified carbon-paste electrode

Teixeira¹,

Marcolino‐Júnior²,

Fatibello‐Filho³

et al. 2004

J. Braz. Chem. Soc.

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“…34,35 Fig. 7A represents the current-time profiles of PPAA/CPE by setting the working electrode potential at 0.35 V (first potential step) and at 0.51 V (second potential step) vs. Ag|AgCl|KCl (3M) in the absence (a) and presence (b-f) of various con- Figure, there is not any net anodic current corresponding to the oxidation mediator in the presence of nitrite, while the forward and backward potential step chronoamperometry of the modified electrode in the absence of nitrite show symmetrical chronoamperometry with an equal charge consumed for the reduction and oxidation of the poly(4-aminoacetanilide) at the surface of CPE (Fig.…”

Section: Chronoamperometric Studiesmentioning

confidence: 99%

A Simple and Efficient Electrochemical Sensor for Electrocatalytic Reduction of Nitrite Based on Poly(4‐aminoacetanilide) Film Using Carbon Paste Electrode

Ojani

Raoof

Rahemi

2011

J Chinese Chemical Soc

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In this study, the electrochemical reduction of nitrite was investigated on poly(4-aminoacetanilide) (PPAA) forming by cyclic voltammetry at the surface of carbon paste electrode. The electrochemical properties of the modified electrode have been studied by cyclic voltammetry and double potential step chronoamperometry. Results showed that in the optimum condition (pH = 0.00) the reduction of nitrite occurred at a potential about 667 mV more positive than that unmodified carbon paste electrode. This amount of electrocatalytic ability is high compared with other electrocatalysts. Using a chronoamperometric method, the catalytic rate constant (k) was calculated 8.4 × 10 4 cm 3 mol -1 s -1 . Also, the electrocatalytic reduction peak currents was found to be linear with the nitrite concentration in the ranges of 5 × 10 -4 M to 2.5 × 10 -2 M and 2 × 10 -5 M to 7 × 10 -3 M with detection limits (2s) were determined as 4.5 × 10 -4 M and 1 × 10 -5 M by cyclic voltammetry (CV) and hydrodynamic amperometry methods respectively. Recovery experiments exhibit the satisfactory results.

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“…In order to get the information on the rate determining step, Tafel slop (b) determinates using the following equation for a totally irreversible diffusion controlled process [18]:…”

Section: Electrooxidation Of L-cysteic Acid At the Surface Of 4fepemcpementioning

confidence: 99%

<b>Voltammetric determination of l-cysteic acid on a 1-[4-(ferrocenyl-ethynyl)phenyl]-1-ethanone modified carbon paste electrode</b>

Raoof

Ojani

Karimi‐Maleh

2008

Bull. Chem. Soc. Eth.

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ABSTRACT. The electrochemical behaviour of L-cysteic acid was studied at the surface of 1-[4-(ferrocenylethynyl)phenyl]-1-ethanone modified carbon paste electrode (4FEPEMCPE) in aqueous media using cyclic voltammetry and double step potential chronoamperometry. It has been found, that under optimum condition (pH 7.00) in cyclic voltammetry, the oxidation of L-cysteic acid at the surface of 4FEPEMCPE is occurred at a potential about 220 mV less positive than that an unmodified carbon paste electrode. The kinetic parameters such as electron transfer coefficient, α, and catalytic reaction rate constant, K / h, were also determined using electrochemical approaches. The electrocatalytic oxidation peak current of L-cysteic acid showed a linear dependent on the L-cysteic acid concentration and linear calibration curves were obtained in the ranges of 9 × 10 -5 -6.2 × 10 -3 M and 2.0 × 10 -7 -1.17 × 10 -5 M of L-cysteic acid concentration with cyclic voltammetry (CV) and differential pulse voltammetry (DPV) methods, respectively. The detection limits (3σ) were determined equal to 2.3 × 10 -5 M and 8.7 × 10 -8 M by CV and DPV methods. This method was also examined as a selective, simple and precise new method for voltammetric determination of L-cysteic acid in serum of patient's blood with migraine disease.

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Electrocatalytic characteristics of ascorbic acid oxidation at nickel plated aluminum electrodes modified with nickel pentacyanonitrosylferrate films

Cited by 130 publications

References 19 publications

Voltammetric determination of dipyrone using a N,N'-ethylenebis(salicylideneaminato)oxovanadium(IV) modified carbon-paste electrode

Voltammetric determination of dipyrone using a N,N'-ethylenebis(salicylideneaminato)oxovanadium(IV) modified carbon-paste electrode

A Simple and Efficient Electrochemical Sensor for Electrocatalytic Reduction of Nitrite Based on Poly(4‐aminoacetanilide) Film Using Carbon Paste Electrode

<b>Voltammetric determination of l-cysteic acid on a 1-[4-(ferrocenyl-ethynyl)phenyl]-1-ethanone modified carbon paste electrode</b>

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