A contribution to the voltammetric study of cystine and cysteine at Pt electrodes in 0.5 M H2SO4

Samec, Zdeněk; Malysheva, Zh. N.; Koryta, J.; Pradáč, J.

doi:10.1016/s0022-0728(75)80151-3

Cited by 26 publications

(12 citation statements)

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“…NAC could be directly oxidized at some noble metals and graphite electrodes. Electro-oxidation of NAC involves a strong interaction of the sulfur atom with an active site on the electrode surface for noble metals [34,35]. In our experimental work, direct electro-oxidation of NAC at a glassy carbon electrode was very slow in 0.2 M Na 2 SO 4 aqueous solution.…”

Section: Electrochemical Oxidation Of Nac In the Presence Of Afcmentioning

confidence: 61%

Electrocatalytic oxidation of N-acetyl-l-cysteine by acetylferrocene at glassy carbon electrode

Zuo-ning

Zhang

Liu

2005

Journal of Electroanalytical Chemistry

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Section: Electrochemical Oxidation Of Nac In the Presence Of Afcmentioning

confidence: 61%

Electrocatalytic oxidation of N-acetyl-l-cysteine by acetylferrocene at glassy carbon electrode

Zuo-ning

Zhang

Liu

2005

Journal of Electroanalytical Chemistry

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“…For a better comprehension, a surface roughness was considered, as in Dourado et al . and Samec et al . In both works the H adsorption on Pt as fully covered surfaces was considered and estimated that the L–Cys θ max at pH 0 should be around 0.6.…”

Section: Resultsmentioning

confidence: 99%

“…The same organic functionality is responsible for the high affinity of the molecule to metallic surfaces. Therefore, L–Cys has been widely studied in electrochemistry, and similar to alkane thiols these molecules are known as electrode modifiers.…”

Section: Introductionmentioning

confidence: 99%

Kinetics, Assembling, and Conformation Control of L‐Cysteine Adsorption on Pt Investigated by in situ FTIR Spectroscopy and QCM‐D

et al. 2018

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A quartz crystal microbalance method with dissipation (QCM-D) and attenuated total reflection Fourier-transform infrared (ATR-FTIRS) spectroscopy were used to study the adsorption of L-cysteine (L-Cys) on Pt. Through QCM-D, it was possible to verify that the viscoelastic properties of the adsorbed species play an important role in the adsorption, rendering Sauerbrey's equation inapplicable. The modelling of QCM-D data exposed two different processes for the adsorption reaction. The first one had an activation time and is fast, whereas the second is slow. These processes were also resolved by ATR-FTIRS and identified to be water and anion adsorption preceded by L-Cys adsorption. Both techniques reveal that the degree of surface coverage is pH dependent. Spectroscopic data indicate that the conformation of L-Cys changes with pH and that the structures do not fully agree with those proposed in literature for other metallic surfaces. The assembling of the adsorbed monolayer appeared to be very fast, and it was not possible to determine or quantify this kinetics. The conformation is also controlled by applied potential, and the anion adsorption and interfacial water depends on the conformation of the adsorbed molecules.

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“…As reported earlier, CySH can be oxidized to either disulfide or cysteic acid depending on the nature of mediator used in the electron transfer reaction [41,42]. It is also known that the oxidation of CySH occurs via strong interaction of the sulfur atom with the active sites of noble metals [43,44]. The chronoamperometric behavior of both CySH and CyS-SCy is further studied for the evaluation of the catalytic rate constant (k cat ) [45].…”

Section: Electrocatalytic Behavior Of the Spe/nf-pmomentioning

confidence: 97%

Direct Electrocatalytic Oxidation of Cysteine and Cystine Based on Nafion/Lead Oxide‐Manganese Oxide Combined Catalyst

2008

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This article reports direct electrocatalytic oxidation of cysteine (CySH) and cystine (CyS-SCy) at an inexpensive Nafion/lead oxide-manganese oxide combined catalyst in physiological pH. The synthesized lead oxide-manganese oxide material is simply mixed with Nafion in the form of cast solution and modified on a disposable screen-printed carbon electrode (designated as SPE/Nf-PMO) for biosensing application. Electrochemical study with a standard redox couple of quinone/hydroquinone demonstrates an enhanced current response at the combined catalyst compared to its individual component. Surface characterization further provides information regarding the structural morphology of the catalyst to its catalytic performance. Direct electrocatalytic oxidation signals are observed at þ 0.75 and þ 1.20 V vs. Ag/AgCl for cysteine and cystine, respectively, at the SPE/Nf-PMO. To extend the applicability, we further apply the proposed system for the detection of cysteine and cystine by flow injection analysis (FIA). Under optimized conditions, the detection limit (S/N ¼ 3) is 0.43 mM and 0.33 mM for cysteine and cystine, respectively.

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A contribution to the voltammetric study of cystine and cysteine at Pt electrodes in 0.5 M H2SO4

Cited by 26 publications

References 0 publications

Electrocatalytic oxidation of N-acetyl-l-cysteine by acetylferrocene at glassy carbon electrode

Electrocatalytic oxidation of N-acetyl-l-cysteine by acetylferrocene at glassy carbon electrode

Kinetics, Assembling, and Conformation Control of L‐Cysteine Adsorption on Pt Investigated by in situ FTIR Spectroscopy and QCM‐D

Direct Electrocatalytic Oxidation of Cysteine and Cystine Based on Nafion/Lead Oxide‐Manganese Oxide Combined Catalyst

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