Comparison of diffusivities data of streptocyanine dyes by electrochemical and NMR-DOSY methods

André-Barrès, Christiane; Najjar, Fadia; Maether, Marie-Pierre; Payrastre, Corinne; Lavedan, Pierre; Tzedakis, Théodore

doi:10.1016/j.jelechem.2012.09.030

Cited by 2 publications

(3 citation statements)

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“…If the kinetics is governed by electron transfer, followed by fast dimerization, the apparent transfer coefficient˛a p can be evaluated from equations (12) and (13), respectively at 0.60 and 0.68. Variation of log k ET with potential (combination of (10), (11) and D = 1.5 × 10 −9 m 2 .s −1 [31]) was not linear (Fig. 7) thus indicating that the classical Butler-Volmer equation is not applicable in this case (0.1-5 V.s −1 ).…”

Section: Kinetics Of the Electron Transfer Reaction (1) Preceding Thementioning

confidence: 94%

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Reductive dimerization mechanisms of some streptocyanine dyes

André-Barrès

Najjar

Maether

et al. 2014

Electrochimica Acta

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Cyclic voltammetric studies of streptocyanine dyes were carried out on a glassy carbon electrode. For dye electroreduction, logarithmic analysis of the convoluted current indicates an EC2 mechanism with dimerization following electron transfer. Relevant kinetic and thermodynamic values are reported. * Corresponding authors. approach the biochemical mechanism of action of potential drug molecules on the redox machinery of the cells (NADPH-cytochrome P450 reductase). The authors state that the redox ability of these 'bio-reductive' drugs, expressed in terms of the redox potential, has to be in the range: E activation by flavoproteines < E 'bio-reductive ′ drugs < E protection against O2. The reduction potentials thus obtained must be in the range of-0.50 to-0.10 V vs. SHE in buffered aqueous media and more negative in non-aqueous media; the values calculated in [15] are:-1.10 to-0.70 V vs. SCE. Note that the anti-cancer activity of both cyanine and merocyanine dyes has been correlated (patent [16]) with their redox potentials, particularly in the cathodic range from-1.10 to-0.80 V vs. SCE. The present study, carried out using voltammetry techniques, focuses on both the anodic and cathodic electrochemical behaviors of various streptocyanine dyes. Resulting voltammograms were analyzed using deconvolution techniques, expecting to get a better understanding of their reductive reaction mechanism, especially regarding the evolution of the radicals produced by the cathodic reaction. Coupling of the data obtained here with the biological properties of streptocyanines should help to examine the

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Section: Kinetics Of the Electron Transfer Reaction (1) Preceding Thementioning

confidence: 94%

“…Based on the Marcus theory, the dependence of the cathodic transfer coefficient on the potential can be reached (for r > 0.1 V.s −1 ) by a combination of equations (10) and (11), and using a value of 1.3 × 10 −9 m 2 .s −1 for D [31] (Fig. 7).…”

Section: Kinetics Of the Electron Transfer Reaction (1) Preceding Thementioning

confidence: 99%

Reductive dimerization mechanisms of some streptocyanine dyes

André-Barrès

Najjar

Maether

et al. 2014

Electrochimica Acta

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“…Porém este tipo de sensores só podem ser usado em condições apropriadas, exigindo controle de pH, temperatura e algumas vezes a adição de cofatores, o que leva a uma baixa estabilidade e baixa reprodutibilidade desses sensores enzimáticos (HWANG et al, 2018). Por outro lado, os sensores eletroquímicos não enzimaticos são considerados uma alternativa para detecção sensível e seletiva para espécies de interesse (ANDRÉ-BARRÈS et al, 2012).…”

Section: Introductionunclassified

Azo-Polímero Molecularmente Impresso Como Estratégia No Desenvolvimento De Uma Nova Plataforma Sensorial Para Detecção De Ácido Úrico

Olean‐Oliveira¹,

Cardoso²,

F.S.Teixeira³

2019

COLLOQ EXACTARUM

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RESUMO -No presente trabalho foi estudado o desenvolvimento de um polímero molecularmente impresso (PMI) baseado no poli(azo-Bismarck Y) para detecção de ácido úrico. O filme PMI foi preparado pela eletropolimerização do monômero Bismarck Brown Y na presença de ácido úrico como molécula molde sobre a superfície do eletrodo de óxido de estanho dopado com flúor (FTO). O sensor PMI-poli(azo-Bismarck Y) exibiu boa resposta eletroquímica, alta sensibilidade e seletividade na ligação específica ao ácido úrico. Sob as condições experimentais otimizadas, a resposta voltamétrica do sensor proposto foi linear no intervalo de concentração de 0,20 mmol L -1 a 0,60 mmol L -1 , com limite de detecção de 0,17 mmol L −1 . Palavras chaves: Sensor eletroquímico; polímero molecularmente impresso; detecção de ácido úrico.

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Comparison of diffusivities data of streptocyanine dyes by electrochemical and NMR-DOSY methods

Cited by 2 publications

References 34 publications

Reductive dimerization mechanisms of some streptocyanine dyes

Reductive dimerization mechanisms of some streptocyanine dyes

Azo-Polímero Molecularmente Impresso Como Estratégia No Desenvolvimento De Uma Nova Plataforma Sensorial Para Detecção De Ácido Úrico

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