Estudo eletroquímico de Fe[Fe(CN)5NO] em eletrodo de pasta de grafite

Carmo, Devaney Ribeiro do; Silva, Ricardo Moutinho da; Stradiotto, Nelson Ramos

doi:10.1590/s0100-46702002000200017

Cited by 24 publications

(12 citation statements)

References 14 publications

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“…The electrochemical behavior of iron nitroprusside modified graphite paste electrode, already described in report recent, 17 exhibits two redox couples. The electrocatalysis of graphite paste electrode modified with Fe(II)NP for electro-oxidation of L-cys and N-acy in a 1.0 mol L -1 KCl solution is showed in Figures 1 and 2 that the electrochemical behavior of L-cysteine and Nacetylcysteine is similar.…”

Section: Resultsmentioning

confidence: 84%

“…Characterization and electrochemical behavior of Fe(II)NP have been recently reported. 17 In a second part of theses studies, we will describe the electrocatalytic properties of graphite paste electrode modified with iron nitroprusside as a mediator for oxidation of L-cysteine and N-acetylcysteine. These sulfhydryl compounds play very important role in living systems.…”

Section: Introductionmentioning

confidence: 99%

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Electrocatalytic and voltammetric determination of sulfhydryl compounds through iron nitroprusside modified graphite paste electrode

Carmo¹,

Silva²,

Stradiotto³

2003

J. Braz. Chem. Soc.

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) 2 = 0,85 V apresentou uma resposta eletrocatalítica para os compostos sulfidrílicos; L-cisteína e N-acetylcisteína. A oxidação eletrocatalítica dos compostos sulfidrílicos pelo mediador foi empregada para a determinação de L-cisteína e N-acetilcisteína. O eletrodo de pasta de grafite modificado para a determinação de L-cisteína e N-acetilcisteína apresenta uma linearidade de 9,2 × 10 -4 -2,0 × 10 -2 e 9,6 × 10 -4 -1,4 × 10 -2 mol L -1 com limite de detecção de 1,9 × 10 -4 mol L -1 e 1,5 × 10 -4 mol L -1 e desvio padrão relativo de ± 5 e 4% (n=3) ) 2 = 0.85 V presents an electrocatalytic response for sulfhydryl compounds. The electrocatalytic oxidation of sulfhydryl compounds by the mediator has been used for the determination of L-cysteine and N-acetylcysteine. The modified graphite paste electrode gives a linear range from 9.2 × 10 -4 -2.0 × 10 -2 ; 9.6 × 10 -4 -1.4 × 10 -2 mol L -1 for the determination of L-cysteine and N-acetylcysteine, respectively, with detection limit of 1.9 × 10 -4 mol L -1 ; 1.5 × 10 -4 mol L -1 and relative standard desviations ± 5% and 1.5 × 10 -3 mol L -1 ± 4% (n=3). The amperometric sensitivities are 0.024 and 0.027 µA/µmol L -1 for L-cysteine and N-acetylcysteine, respectively. The application of this electrode was tested and a commercial pharmaceutical product (Fluimucil) has been determined.

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Section: Resultsmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Electrocatalytic and voltammetric determination of sulfhydryl compounds through iron nitroprusside modified graphite paste electrode

Carmo¹,

Silva²,

Stradiotto³

2003

J. Braz. Chem. Soc.

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“…that has a low-ion mobility in relation to K ? [24]. The cyclic voltammograms of carbon paste electrode modified with TiPhCuHCF recorded in the presence of different anions indicated that the two redox processes are not strongly influenced by the nature of the anion (Cl -, NO 3 -, and SO 4 2-) (results not shown).…”

Section: Study On the Effect Of Cations And Anionsmentioning

confidence: 90%

“…ion in the redox process, where the shift in potential is attributed to the change in the activity of these ions [25]. For the graphite paste electrode modified with TiPhCuHCF, the slope of this line was 53 mV per decade concentration of potassium ion concentrations, indicating a quasi Nernstian process [24]. Similar to the modified electrode with iron nitroprusside (Fe(II)NP) response where a quasi Nernstian behavior was an indication of the participation of potassium ions in the redox process.…”

Section: Study On the Effect Of Cations And Anionsmentioning

confidence: 96%

“…4, studies performed with different cations showed that not only the current intensity as well as the average potential of redox couples of the two processes (E h 0 ) 1 and (E h 0 ) 2 are influenced by the cation nature, and these potentials are shifted to more anodic regions in the following sequence: Table 1 lists the main electrochemical parameters of the compounds mentioned above and their radii of hydration. Compounds such as Prussian Blue and similar structures that exhibit zeolitic cavity, in other words, channels that allow the insertion of small molecules and ions behave as zeolites [24]. Since they have smaller hydration radii, K ?…”

Section: Study On the Effect Of Cations And Anionsmentioning

confidence: 99%

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Voltammetric studies of titanium (IV) phosphate modified with copper hexacyanoferrate and electroanalytical determination of N-acetylcysteine

Pipi

Carmo

2011

J Appl Electrochem

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Titanium (IV) Phosphate copper hexacyanoferrate composite (TiPhCuHCF) was prepared using a new methodology for the synthesis. A preliminary characterization of the precursor and resulting materials was defined using spectroscopic and chemical techniques. The cyclic voltammogram of the modified electrode containing TiPhCuHCF exhibited two redox couples. The first and second redox couples present a formal potential (E h 0 ) of 0.18 and 0.76 V and were ascribed to the Cu ?/ Cu 2? (E h 0 ) 1 and Fe 2? (CN) 6 /Fe 3? (CN) 6 (E h 0 ) 2 processes, respectively. In a preliminary study, the peak located at 0.76 V displays a sensitive response to N-acetylcysteine. The modified graphite paste electrode showed a linear range from 1.0 9 10 -5 to 7.0 9 10 -4 mol L -1 for the determination of N-acetylcysteine with a limit detection of 6.96 9 10 -5 mol L -1 and relative standard deviation of ± 5% (n = 3) and amperometric sensitivity of 24.79 9 10 -3 A mol L -1 . The modified electrode was electrochemically stable and showed good reproducibility.

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Graphene Oxide as a Platform for Copper Pentacyanonitrosylferrate Nanoparticles and their Behavior in the Electro‐oxidation of N‐Acetylcysteine

et al. 2020

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This work describes the preparation of graphene oxide by the Modified Hummers Method and the chemical modification of its surface with nanoparticles of copper pentacyanonitrosylferrate(III) (GOCuNP). The materials obtained were characterized by Raman spectroscopy, x‐ray photoelectron spectroscopy and transmission electron microscopy. The GOCuNP was characterized by cyclic voltammetry using a graphite paste electrode that presented electrocatalytic response for N‐acetylcysteine with detection limit of 2.97×10−5 mol L−1 at concentration range of 3.00×10−5 to 6.00×10−3 mol L−1 of N‐acetylcysteine. By this way, the bimetallic complex formed is included in the list of materials obtained as potential candidates for the construction of electrochemical sensors for N‐acetylcysteine detection.

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Estudo eletroquímico de Fe[Fe(CN)5NO] em eletrodo de pasta de grafite

Cited by 24 publications

References 14 publications

Electrocatalytic and voltammetric determination of sulfhydryl compounds through iron nitroprusside modified graphite paste electrode

Electrocatalytic and voltammetric determination of sulfhydryl compounds through iron nitroprusside modified graphite paste electrode

Voltammetric studies of titanium (IV) phosphate modified with copper hexacyanoferrate and electroanalytical determination of N-acetylcysteine

Graphene Oxide as a Platform for Copper Pentacyanonitrosylferrate Nanoparticles and their Behavior in the Electro‐oxidation of N‐Acetylcysteine

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