Oxidation of cysteine, cysteinesulfinic acid and cysteic acid on a polycrystalline gold electrode

Fawcett, W. Ronald; Fedurco, Milan; Kováčová, Zuzana; Borkowska, Z.

doi:10.1016/0022-0728(93)03060-3

Cited by 78 publications

(62 citation statements)

References 15 publications

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“…On the other hand, although Fawcett et al have been reported the electrooxidation mechanism of chemisorbed L-cysteic acid on a polycrystalline gold electrode [9] and we reported the electrocatalytic oxidation and voltammetric determination of L-cysteic acid at the surface of p-bromanil modified carbon paste electrode [12]. Our literature survey shows that, there is not another report about the electrocatalytic determination of L-cysteic acid.…”

Section: Introductionmentioning

confidence: 69%

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<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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Section: Introductionmentioning

confidence: 69%

“…During migraine and alzaymer total plasma thiols, L-cysteic acid was found to be high [8,9]. To date, several methods such as gas chromatography [10] and HPLC [11] have been used for determination of L-cysteic acid in various samples.…”

Section: Introductionmentioning

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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“…On the other hand, although W. R. Fawcett et al have been reported the mechanism electrooxidation of chemisorbed lcysteic acid on a polycrystalline gold electrode [27], but our literature survey shows that, there is not any report about electrocatalytic determination of l-cysteic acid. Therefore, in this paper, we discuss the preparation and suitability of a carbon paste electrode spiked with p-bromanil in the electrocatalytic oxidation and determination of l-cysteic acid in an aqueous buffered solution by cyclic voltammetry, double potential-step chronoamperometry and differential pulse voltammetry methods.…”

mentioning

confidence: 92%

“…During migraine and alzaymer total plasma thiols, l-cysteic acid was found to be high [1,2]. Due to the importance of l-cysteic acid, its electroanalytical determination is based on its reducing properties.…”

mentioning

confidence: 97%

Electrocatalytic Oxidation and Voltammetric Determination of L‐Cysteic Acid at the Surface of p‐Bromanil Modified Carbon Paste Electrode

2006

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The electrochemical properties of l-cysteic acid studied at the surface of p-bromanil (tetrabromo-p-benzoquinone) modified carbon paste electrode (BMCPE) in aqueous media by cyclic voltammetry (CV) 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 BMCPE occurs at a half-wave potential of p-bromanil redox system (e.g., 100 mV vs. Ag j AgCl j KCl sat ), whereas, l-cysteic acid was electroinactive in the testing potential ranges at the surface of bare carbon paste electrode. The apparent diffusion coefficient of spiked p-bromanil in paraffin oil was also determined by using the Cottrell equation. The electrocatalytic oxidation peak current of l-cysteic acid exhibits a linear dependency to its concentration in the ranges of 8.00 Â 10 À6 M -6.00 Â 10 À3 M and 5.2 Â 10 À7 M -1.0 Â 10 À5 M using CV and differential pulse voltammetry (DPV) methods, respectively. The detection limits (2s) were determined as 5.00 Â 10 À6 M and 4.00 Â 10 À7 M by CV and DPV methods. This method was used as a new, selective, rapid, simple, precise and suitable voltammetric method for determination of l-cysteic acid in serum of patients blood with migraine disease.

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“…[18][19][20] Cysteine, which has an S-H group and a terminal group (-COOH or -NH2), is a functional X-Y biomolecular. 21 SAM of cysteine on gold (Cys/SAM/Au) has been studied by various groups, [22][23][24][25][26][27][28][29] and has been widely used [30][31][32][33] for electrochemical sensors.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Behavior of Thiamine on a Self-Assembled Gold Electrode and Its Square-Wave Voltammetric Determination in Pharmaceutical Preparations

Wan

Yang

2002

ANAL. SCI.

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The electrochemical behavior of thiamine on a self-assembled electrode of L-cysteine (Cys/SAM/Au) has been investigated and Cys/SAM/Au can be used to detect thiamine using square-wave voltammetry (SWV). At pH 11.40 Britton-Robinson buffer, thiamine exhibits a well-defined anodic peak on Cys/SAM/Au. Under the optimized conditions, the anodic peak current of SWV was linear with the content of thiamine in the range of 1.1 × 10 -8 -2.2 × 10 -6 mol/L; the detection limit was 5.5 × 10 -9 mol/L. The method was successfully applied to the determination of thiamine in pharmaceutical preparations.

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Oxidation of cysteine, cysteinesulfinic acid and cysteic acid on a polycrystalline gold electrode

Cited by 78 publications

References 15 publications

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

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

Electrocatalytic Oxidation and Voltammetric Determination of L‐Cysteic Acid at the Surface of p‐Bromanil Modified Carbon Paste Electrode

Electrochemical Behavior of Thiamine on a Self-Assembled Gold Electrode and Its Square-Wave Voltammetric Determination in Pharmaceutical Preparations

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