Electrocatalytic oxidation of ascorbic acid using benzoquinone as a mediator

Murthy, A. S. N.; Sharma, Jyotsna

doi:10.1002/elan.1140090914

Cited by 17 publications

(5 citation statements)

References 18 publications

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“…38 Additionally, note that BQ plays an important role in various biological redox processes and owing to its large electron affinity it is commonly employed as a redox mediator within electrochemistry. 39,40 The electrochemical properties of the electrode materials of interest were first characterised with regards to our analyte (50 mM BQ in pH 7 PBS), where as depicted in Fig. 7 the typical cyclic voltammetric responses obtained, when utilising unmodified EPPG and BPPG electrodes and EPPG and BPPG electrodes following modification with 40ng of graphene, exhibited voltammetric peaks (E P red ) at ca.…”

Section: Resultsmentioning

confidence: 99%

The electrochemical performance of graphene modified electrodes: An analytical perspective

Brownson

Foster

Banks

2012

Analyst

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We explore the use of graphene modified electrodes towards the electroanalytical sensing of various analytes, namely dopamine hydrochloride, uric acid, acetaminophen and p-benzoquinone via cyclic voltammetry. In line with literature methodologies and to investigate the full-implications of employing graphene in this electrochemical context, we modify electrode substrates that exhibit either fast or slow electron transfer kinetics (edge- or basal- plane pyrolytic graphite electrodes respectively) with well characterised commercially available graphene that has not been chemically treated, is free from surfactants and as a result of its fabrication has an extremely low oxygen content, allowing the true electroanalytical applicability of graphene to be properly de-convoluted and determined. In comparison to the unmodified underlying electrode substrates (constructed from graphite), we find that graphene exhibits a reduced analytical performance in terms of sensitivity, linearity and observed detection limits towards each of the various analytes studied within. Owing to graphene's structural composition, low proportion of edge plane sites and consequent slow heterogeneous electron transfer rates, there appears to be no advantages, for the analytes studied here, of employing graphene in this electroanalytical context.

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Section: Resultsmentioning

confidence: 99%

The electrochemical performance of graphene modified electrodes: An analytical perspective

Brownson

Foster

Banks

2012

Analyst

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“…The effect of electron mediator concentration on the performance of the d-fructose biosensor was also studied using 1 3 10 23 mol l 21 d-fructose at pH 6.7. In this case, the best response was found between 2 3 10 23 mol l 21 and 3 3 10 23 mol l 21 [Fe(CN) 6 ] 32 . Considering that [Fe(CN) 6 ] 32 acts as an electron transfer reagent, the rate of FDH/PQQH 2 oxidation increases markedly with the increase of [Fe(CN) 6 ] 32 concentration up to 2 3 10 23 mol l 21 , as does the current.…”

Section: Effect Of the [Fe(cn) 6 ] 32 Concentrationmentioning

confidence: 91%

“…l-Ascorbate is a more complex redox system than [Fe(CN) 6 ] 3/42 , since it involves two electrons and either one or two protons, depending on the pH. 32 Previous studies 27 have shown that the voltammetric oxidation peak shape depends on the relative rates of the two electron transfers, both of which are potential dependent. Nevertheless, anodic E p is a reliable indicator of changes in the oxidation rate caused by graphite surface modification.…”

Section: Electrochemistry Of the Basic Composite Transducermentioning

confidence: 99%

Determination of D-fructose in foodstuffs by an improved amperometric biosensor based on a solid binding matrix

Stredansky¹,

Pizzariello²,

Stredanská³

et al. 1999

Anal. Commun.

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An improved amperometric biosensor based on a solid binding matrix (SBM) composite transducer has been used for the determination of d-fructose in foodstuffs samples. The enzyme, d-fructose dehydrogenase (EC 1.1.99.11), was incorporated directly into a solid composite transducer containing both 2-hexadecanone as SBM and chemically modified graphite. Hexacyanoferrate(iii) was used as a redox mediator and the current variation caused by the presence of d-fructose was measured amperometrically. The electrochemical properties and the characteristics of the composite fructose biosensors are described. The amperometric signals were fast, reproducible and linearly proportional to d-fructose concentrations in the range 50 3 10 26 -10 3 10 23 mol l 21 , with a correlation coefficient of 0.999. A set of measurements at +0.20 V versus SCE for 2 3 10 23 mol l 21 d-fructose yielded a relative standard deviation for the steady-state current of 2.11%. The use of a chemically modified graphite by a mild oxidation step was shown to improve the biosensor selectivity against anionic interferents such as l-ascorbate. The biosensor proved to be stable for 6 months and the assay of d-fructose by this electrode was not influenced by the presence of sugars or other interferents commonly found in food samples. The biosensor was used for the determination of d-fructose in some food samples, and the results were consistent with those obtained with the commercially available d-fructose enzyme photometric kit.

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“…Murthy et al [28,29] used benzoquinone as a mediator to examine whether quinone derivatives would mediate the oxidation of ascorbic acid. They found that benzoquinone catalyzed the electrochemical oxidation of ascorbic acid at a basal plane graphite electrode.…”

Section: Oxidation Of Ascorbic Acid With Rutin In Lipid Filmmentioning

confidence: 99%

Oxidation of Ascorbic Acid by Rutin at a Glassy Carbon Electrode Modified with Lipid Films

Tang¹,

Zhang²,

Wang³

et al. 2001

Electroanalysis

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Electrocatalytic oxidation of ascorbic acid using benzoquinone as a mediator

Cited by 17 publications

References 18 publications

The electrochemical performance of graphene modified electrodes: An analytical perspective

The electrochemical performance of graphene modified electrodes: An analytical perspective

Determination of D-fructose in foodstuffs by an improved amperometric biosensor based on a solid binding matrix

Oxidation of Ascorbic Acid by Rutin at a Glassy Carbon Electrode Modified with Lipid Films

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