In situ activated 3,5-dinitrobenzoic acid covalent attached to nanostructured platform for NADH electrooxidation

Santhiago, Murilo; Lima, Phabyanno Rodrigues; Santos, Wilney de Jesus Rodrigues; Oliveira, Adriano Bof de; Kubota, Lauro T.

doi:10.1016/j.electacta.2009.06.032

Cited by 30 publications

(29 citation statements)

References 43 publications

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“…In contrast to the nanostructure previously developed by Kubota et al, [4] in our case we do not have a covalent bond between 3,5-DNB and the nanostructured platform. Probably this fact causes the extraordinary large peak current values obtained in our system when compared with those obtained in the prior art.…”

Section: -Results and Discussioncontrasting

confidence: 44%

“…With this purpose, work is currently being conducted in our laboratory. In contrast to the nanostructure previously developed by Kubota et al, [4] in our case we do not have a covalent bond between 3,5-DNB and the nanostructured platform. …”

Section: -Conclusioncontrasting

confidence: 44%

“…We have included strong evidences supporting our interpretation. This redox couple could be used as a mediator in the electrocatalysis of NADH, as has been previously shown by Kubota´s group [4]. With this purpose, work is currently being conducted in our laboratory.…”

Section: -Conclusionmentioning

confidence: 99%

“…The resulting 4-NBA-MWCNT powder was abrasively immobilized onto the surface of a clean BPPG electrode. 4 In a previous paper, Kubota et al, [4] revealed a modified electrode wherein 3,5-dinitrobenzoic acid ( 3,5-DNB) was covalent attached to nanostructured platform based on MWCNTs and polyethilenimine (PEI). Then, a nitroso / hydroxylamine derivatives couple was electrogenerated in-situ by cycling the potential between 0.15 and -0.55 V vs SCE.…”

Section: -Introductionmentioning

confidence: 99%

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Voltammetric behavior of 3,5-dinitrobenzoic acid in solution on GCE and encapsulated on multiwalled carbon nanotube modified electrode

Moscoso

Carbajo

Mozo

et al. 2016

Journal of Electroanalytical Chemistry

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The cyclic voltammetric behavior of 3,5-dinitrobenzoic acid (3,5-DNB) in 0.1 M PBS of pH 7 was examined at a glassy carbon electrode (GCE). 3,5 -DNB was found to produce two irreversible reduction peaks corresponding to the reduction of each nitro group in the 3,5 -DNB molecule. Our results contradict previous studies (P. Gopal et al. Journal of Molecular Liquids 178 (2013) 168-174) wherein the same peaks are assigned as, the first, to the reduction of the nitro group to hydroxylamine and the second, to the subsequent reduction to amine derivative. Also we report that GCE modified with multiwalled carbon nanotubes (MWCNTs) can be derivatized with 3,5 DNB. The derivatization procedure involves simple immersion of the MWCNT-modified electrode in a solution containing 3,5 -DNB. SEM images reveal that the network of nanotubes form a homogeneous, twisted, densely packed, three-dimensional array that remains attached to the GCE surface. Both electrochemical and SEM measurements indicate that 3,5-DNB is encapsulated on the electrode, most probably by being trapped within the pockets of the mentioned three-dimensional array, without formation of covalent bonding.FONDECYT 113016

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Section: -Results and Discussioncontrasting

confidence: 44%

Section: -Conclusioncontrasting

confidence: 44%

Section: -Conclusionmentioning

confidence: 99%

Section: -Introductionmentioning

confidence: 99%

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Voltammetric behavior of 3,5-dinitrobenzoic acid in solution on GCE and encapsulated on multiwalled carbon nanotube modified electrode

Moscoso

Carbajo

Mozo

et al. 2016

Journal of Electroanalytical Chemistry

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“…[24][25][26][27] Due to the unique properties of carbon nanotubes (CNTs) such as high surface area, chemical stability, and high electrical conductivity, 28 the application of CNTs in fabrication of electrochemical sensors and biosensors has been studied by many research groups. [30][31][32][33][34] The subtle electronic properties of carbon nanotubes suggest that they have the ability to promote electron transfer reaction when used as an electrode material in an electrochemical reaction, which provides a new way in the electrode surface modification for designing new electrochemical sensors. 20,[29][30][31][32][33][34][35][36] Recently, we have used MWCNT modified electrodes for electrocatalytic determination of some species.…”

Section: Introductionmentioning

confidence: 99%

Differential pulse voltammetric determination of hydroxylamine at an indenedione derivative electrodeposited on a multi-wall carbon nanotube modified glassy carbon electrode

Zare¹,

Chatraei²,

Nasirizadeh³

2010

J. Braz. Chem. Soc.

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A eletrodeposição de filmes finos de um derivado da indenodiona em eletrodo de carbono vítreo modificado por nanotubos de carbono de paredes múltiplas (ECV-NTCPM), mostra um par de picos com características de confinamento em superfície. O eletrodo de carbono vítreo modificado por NTCPM e pela indenodiona (ECV-NTCPMI) apresenta uma alta atividade catalítica para a eletro-oxidação de hidroxilamina. O potencial do pico anódico para a oxidação da hidroxilamina em ECV-NTCPMI é aproximadamente 140 mV, enquanto em ECV-NTCPM e em ECV modificado pela indenodiona (ECV-MI), os potenciais de pico aparecem em aproximadamente 505 e 525 mV, respectivamente. Os resultados mostram que há um aumento da corrente do pico anódico de oxidação da hidroxilamina em ECV-NTCPMI quando comparado ao valor obtido com ECV-MI ou ECV-NTCPM. Os resultados também sugerem que a combinação de NTCPM com um mediador melhora, definitivamente, as características de oxidação da hidroxilamina. Além disso, a voltametria de pulso diferencial exibe dois intervalos dinâmicos lineares de 1,0-10,0 e 10,0-100,0 µmol L -1 com sensitividade de 0,1955 e 0,0841 µA L µmol -1 respectivamente e um limite de detecção mais baixo, de 0,8 µmol L -1 para hidroxilamina. A excelente reversibilidade eletroquímica do par redox, a simplicidade técnica, e a boa atividade eletrocatalítica para hidroxilamina são as vantagens deste eletrodo modificado. Finalmente, a atividade do ECV-NTCPMI foi também investigada para a determinação da hidroxilamina em duas amostras.The electrodeposited thin films of an indenedione derivative on multi-wall carbon nanotubes modified glassy carbon electrode (MWCNT-GCE) shows one pair of peaks with surface confined characteristics. The indenedione MWCNT modified GCE (IMWCNT-GCE) presents a highly catalytic activity toward hydroxylamine electro-oxidation. The anodic peak potential for hydroxylamine oxidation at IMWCNT-GCE is about 140 mV whereas at MWCNT-GCE and indenedione modified GCE (IMGCE), the peak potentials appear at about 505 and 525 mV respectively. The results show that there is an enhancement of the anodic peak current of hydroxylamine oxidation at IMWCNT-GCE as compared to the value obtained at IMGCE or MWCNT-GCE. The results also suggest that a combination of MWCNT and mediator definitely improves the characteristics of hydroxylamine oxidation. Furthermore, differential pulse voltammetry exhibits two linear dynamic ranges of 1.0-10.0 and 10.0-100.0 µmol L -1 with sensitivity of 0.1955 and 0.0841 µA L µmol -1 respectively and a lower detection limit of 0.8 µmol L -1 for hydroxylamine. Excellent electrochemical reversibility of the redox couple, technical simplicity, and good electrocatalytic activity for hydroxylamine are the advantages of this modified electrode. Finally, the activity of IMWCNT-GCE was also investigated for hydroxylamine determination in two natural samples.

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Synthesis and Electrochemical Characterization of Poly(2‐methoxy‐4‐vinylphenol) with MWCNTs

et al. 2011

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The present work describes a simple grafting of poly-2-methoxy-4-vinylphenol to multiwalled carbon nanotubes (MWCNTs) by in situ free radical polymerization. The synthesis was performed using mild conditions and the product (MWCNTs/pMVP) was stable for at least 6 months. Also, the dispersion of the MWCNTs/pMVP in dimethylformamide remained homogeneously distributed for up to 2 days, facilitating the modification of glassy carbon electrode. After an in situ activation process, the stable redox couple was formed (catechol/quinone) being able to electrocatalyze NADH oxidation at low overpotential with a high rate constant (k obs ).

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In situ activated 3,5-dinitrobenzoic acid covalent attached to nanostructured platform for NADH electrooxidation

Cited by 30 publications

References 43 publications

Voltammetric behavior of 3,5-dinitrobenzoic acid in solution on GCE and encapsulated on multiwalled carbon nanotube modified electrode

Voltammetric behavior of 3,5-dinitrobenzoic acid in solution on GCE and encapsulated on multiwalled carbon nanotube modified electrode

Differential pulse voltammetric determination of hydroxylamine at an indenedione derivative electrodeposited on a multi-wall carbon nanotube modified glassy carbon electrode

Synthesis and Electrochemical Characterization of Poly(2‐methoxy‐4‐vinylphenol) with MWCNTs

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