Comparison of electrochemical oxidation of epinephrine in the presence of interfering ascorbic and uric acids on gold electrodes modified with S-functionalized compounds and gold nanoparticles

Łuczak, Teresa

doi:10.1016/j.electacta.2009.05.047

Cited by 87 publications

(52 citation statements)

References 42 publications

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“…As shown, the colloidal gold gives the maximum absorbance at about 520 nm. This length was the same as that obtained earlier [29,30,33,34]. It is known that the Au nanoparticles of diameters between 2.6 nm and 20 nm could be expected when the absorption maximum appears between 514 nm and 530 nm.…”

Section: Resultsmentioning

confidence: 61%

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Epinephrine Oxidation in the Presence of Interfering Molecules on Gold and Gold Electrodes modified with Gold Nanoparticles and Thiodipropionic Acid in Aqueous Solution. A Comparative Study

Łuczak

2009

Electroanalysis

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Thiodipropionoc acid (TDPA), cysteamine (CA) and gold nanoparticles (Au-NPs) modified gold pure electrodes have been applied in voltammetric sensors for simultaneous detection of epinephrine (EP), ascorbic (AA) and uric (UA) acids. Modified electrodes with self assembled layers (SAMs) show high selectivity, sensitivity, reproducibility and stability. A linear relationship between the epinephrine concentration and the current response is obtained in the range of 0.1 mM to 0.65 mM with the detection limit 0.065 mM for the electrodes modified at 2D surface and in the range of 0.1 mM to 0.75 mM with the detection limit 0.082 mM for the electrodes modified at the 3D surface.

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Section: Resultsmentioning

confidence: 61%

“…The conditions of storage and the frequency of measurements using modified electrodes was the same as described earlier [30].…”

Section: Methodsmentioning

confidence: 99%

Epinephrine Oxidation in the Presence of Interfering Molecules on Gold and Gold Electrodes modified with Gold Nanoparticles and Thiodipropionic Acid in Aqueous Solution. A Comparative Study

Łuczak

2009

Electroanalysis

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“…It has been previously reported that Au electrodes modified with AuNPs largely increase the immobilized amount of S-functionalized compounds and enhance the Au-S bond and stability of SAMs [54]. Herein, DTSPAuNP-modified UMEAs has shown higher reproducibility and stability as compared to DTSP-modified UMEAs.…”

Section: à2mentioning

confidence: 91%

Electrochemical Performance of Self‐Assembled Monolayer Gold Nanoparticle‐Modified Ultramicroelectrode Array Architectures

2012

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Surface architectures based on gold nanoparticles (AuNPs) electrodeposited on gold ultramicroelectrode arrays (UMEAs) and further modified with self-assembled monolayers (SAMs) of two different thiol molecules were evaluated. The voltammetric behavior of the resulting electrochemical transducer approaches appeared to be fairly different compared to that of SAM-modified UMEAs and microelectrode counterparts. Such behavior indicates that the electrodeposited AuNPs played a key role in the arrangement of the thiolated probes and the electron transfer processes at the transducer solution interface. A detailed description of this phenomenon was carried out with the aim of showing the potential of the presented SAM-AuNP-UMEA based transducer to develop robust biosensor approaches.

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“…Both compounds undergo two-electron oxidation at similar potentials at commonly used electrode materials and the oxidation current of ascorbic acid (AA) dominates the signal observed. Various strategies have been proposed to overcome this drawback, including modification of electrodes with polymer films [16][17][18][19][20], DNA [21,22], ion-exchange membranes [23,24], self-assembled monolayers (SAMs) [25][26][27][28] and nanoparticles (NPs) and nanomaterials [29][30][31][32][33][34], which allow the effective detection of the catecholamines in the presence of AA. The electrochemical approaches based on chemically modified electrodes have been focused in [35] (i) improve electrocatalysis, (ii) reduce surface fouling due to the polymerization of the oxidation products of catecholamines and (iii) prevention of undesirable side reactions.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Sensing of Catecholamines at the Water/ 1,6‐Dichlorohexane Interface

2013

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In this work, the analytical use of facilitated ion transfer of catecholamines by dibenzo-18-crown-6 was investigated at the water/1,6-dichlorohexane interface using electrochemical methods (cyclic and square wave voltammetry). The experimental conditions for the analytical determination of noradrenaline and dopamine were established and detection limits of 1.7 and 0.35 mM were obtained, respectively. The effect of excess ascorbic acid on the transfer and detection of the two catecholamines was investigated. The selectivity coefficients obtained for dopamine and noradrenaline in the presence of ascorbic acid were 3.5 10 À4 and 2.5 10 À3 , respectively.

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Comparison of electrochemical oxidation of epinephrine in the presence of interfering ascorbic and uric acids on gold electrodes modified with S-functionalized compounds and gold nanoparticles

Cited by 87 publications

References 42 publications

Epinephrine Oxidation in the Presence of Interfering Molecules on Gold and Gold Electrodes modified with Gold Nanoparticles and Thiodipropionic Acid in Aqueous Solution. A Comparative Study

Epinephrine Oxidation in the Presence of Interfering Molecules on Gold and Gold Electrodes modified with Gold Nanoparticles and Thiodipropionic Acid in Aqueous Solution. A Comparative Study

Electrochemical Performance of Self‐Assembled Monolayer Gold Nanoparticle‐Modified Ultramicroelectrode Array Architectures

Electrochemical Sensing of Catecholamines at the Water/ 1,6‐Dichlorohexane Interface

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