Electrochemical studies of 6-mercaptonicotinic acid monolayer on Au electrode

Raj, C. Retna; Behera, S.

doi:10.1016/j.jelechem.2005.04.012

Cited by 31 publications

(26 citation statements)

References 40 publications

(67 reference statements)

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“…Changes in solution pH resulted in charge variation of the self-assembled monolayer terminal group and, consequently, the electrostatic interaction of the SAM with the electroactive species in the solution depended on the medium acidity. Raj and Behera [23] reported the electrochemical characteristics of 6-mercaptonicotinic acid (MNA) on a gold electrode. The SAM was investigated by cyclic voltammetric and impedance techniques and it was observed that the electron transfer for the redox reactions of different molecules at the monolayer was controlled by electrostatic and hydrophobic effects.…”

Section: Introductionmentioning

confidence: 99%

Studies on the electrochemical behavior of a cystine self-assembled monolayer modified electrode using ferrocyanide as a probe

Pedrosa

Paixão

Freire

et al. 2007

Journal of Electroanalytical Chemistry

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Section: Introductionmentioning

confidence: 99%

Studies on the electrochemical behavior of a cystine self-assembled monolayer modified electrode using ferrocyanide as a probe

Pedrosa

Paixão

Freire

et al. 2007

Journal of Electroanalytical Chemistry

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“…At low pH (acid solution), L-cysteine monolayer can be protonated carrying positive charges. On the contrary, at high pH (basic solution), the SAM can be deprotonated, carrying negative charges (11,12). The results revealed that when the solution pH increases from 2 to 11, the ǻE p value increases from 69 to 385 mV and the peak current values decreases.…”

Section: Effect Of Immobilization Timementioning

confidence: 98%

Electron Transfer at L-Cysteine Monolayer on Palladium Surface: A pH Effect Study

Feliciano-Ramos¹,

Cabán-Acevedo²,

Cabrera³

2011

ECS Trans.

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The electrochemical properties of L-cysteine self assembled monolayer on palladium surface has been investigated. The effect of immobilization time of L-cysteine monolayer on palladium was studied by cyclic voltammetry (CV). Further, the electron transfer of the Fe(CN)63-/4- redox couple at different pH values was used to evaluate the protonation and deprotonation of the functional groups (NH2, COOH) at the modified electrode surface by using CV and electrochemical impedance spectroscopy (EIS). When the pH of the solution is high (ca. 11), the monolayer posses negative charge, Fe(CN)63-/4- current is inhibited. On the contrary, a different behavior at low pH (ca. 2) has been found. From the data obtained by CV and EIS, the surface pKa was found to be 7.3 and 7.1, respectively. At pH 7, we have compared Fe(CN)63-/4- peak currents as a function of scan rate, at different supporting electrolytes.

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“…It is well known that AA, DOPAC and UA were present as anonic forms in pH 5.0. 13,29,30 It is expected that the negatively charged AA, DOPAC and UA were electrostatically attracted by the positively charged back bone of the p-ATT film. 24 Thus, enhanced oxidation peak currents were observed for them at modified electrode when compared to bare GC electrode.…”

Section: Electrochemical Behaviour Of Dopac At Bare and P-att Modifiementioning

confidence: 99%

“…8,9 Thus, the selective and sensitive determination of DOPAC is very important not only in the fields of biomedical chemistry and neurochemistry but also for diagnostic and pathological research. 10 Several techniques have been used for the determination of DOPAC including electrochemical, [11][12][13][14][15][16][17][18][19] high-performance liquid chromatography, 20 chemiluminescence 21 and fluorometry. 22 Among these methods, electrochemical methods of detection * For correspondence have attracted incessantly in recent years because they are more selective, sensitive and less time-consuming.…”

Section: Introductionmentioning

confidence: 99%

Selective determination of 3,4-dihydroxyphenylacetic acid in the presence of ascorbic and uric acids using polymer film modified electrode

Kalimuthu

John

2011

J Chem Sci

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We report here the highly sensitive and selective electrochemical determination of 3,4-dihydroxyphenylacetic acid (DOPAC), one of the dopamine metabolites in the presence of important interferents ascorbic acid (AA) and uric acid (UA) using an ultrathin electropolymerized film of 5-amino-1,3,4-thiadiazole-2-thiol (p-ATT) modified glassy carbon (GC) electrode in 0.20 M phosphate buffer solution (pH 5.0). The bare GC electrode fails to resolve the oxidation peaks of AA, DOPAC and UA in a mixture. Further, the oxidation peak potentials of them were shifted to more positive potential with decreased peak currents in the subsequent cycles. On the other hand, the p-ATT modified electrode not only separated the voltammetric signals of AA, DOPAC and UA but also enhanced their peak currents. The amperometric current response was increased linearly with increasing DOPAC concentration in the range of 4.0 × 10 −8 to 1.0 × 10 −5 M and the detection limit was found to be 150 pM (S/N = 3).

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Electrochemical studies of 6-mercaptonicotinic acid monolayer on Au electrode

Cited by 31 publications

References 40 publications

Studies on the electrochemical behavior of a cystine self-assembled monolayer modified electrode using ferrocyanide as a probe

Studies on the electrochemical behavior of a cystine self-assembled monolayer modified electrode using ferrocyanide as a probe

Electron Transfer at L-Cysteine Monolayer on Palladium Surface: A pH Effect Study

Selective determination of 3,4-dihydroxyphenylacetic acid in the presence of ascorbic and uric acids using polymer film modified electrode

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