Electrochemical oxidation of mono- and disaccharides at fresh as well as oxidized copper electrodes in alkaline media

Torto, Nelson; Ruzgas, Tautgirdas; Gorton, Lo

doi:10.1016/s0022-0728(99)00041-8

Cited by 129 publications

(82 citation statements)

References 15 publications

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“…The oxidation of glucose in an alkaline solution at copper or copper-containing alloys is well known, although the mechanism by which this oxidation proceeds remains somewhat controversial [13][14][15][16][17][18][19]. Johnson and co-workers [14,15] in studying the oxidation of glucose at a number of copper alloys have explained the enhanced oxidation at a Mn 5 Cu 95 in terms of the Mn sites functioning as Lewis acid sites for adsorption of the polar glucose molecule, while they have interpreted the oxidation at a Ni 10 Cu 90 alloy in terms of a redox-mediated mechanism.…”

Section: Introductionmentioning

confidence: 99%

Oxidation and photo-induced oxidation of glucose at a polyaniline film modified by copper particles

Farrell

Breslin

2004

Electrochimica Acta

116

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The oxidation and photo-induced oxidation of glucose at a copper-dispersed polyaniline film was studied in an alkaline hydroxide solution. It was found that the copper-dispersed polyaniline electrode was capable of oxidizing glucose at potentials between 0.2 and 0.75 V/(Ag|AgCl), with the rate of oxidation being higher than that observed at a bulk copper electrode. On irradiation of the composite with polychromatic UV light, a further increase in the rate of the glucose oxidation reaction was observed. Formate was identified as the main product of the glucose oxidation reaction under both light and dark conditions using 1 H NMR spectrometry. This suggests that illumination does not alter significantly the reaction pathway.

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Section: Introductionmentioning

confidence: 99%

Oxidation and photo-induced oxidation of glucose at a polyaniline film modified by copper particles

Farrell

Breslin

2004

Electrochimica Acta

116

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“…However in the alkaline solution with ligand free as just like the solution used in this experiment, the Cu electrode behaves as a stable and reproducible electrochemical surface. 10,11 This seems due to the Cu oxide layer on the surface protects the surface from further available reactions.…”

Section: Resultsmentioning

confidence: 99%

Observation of Electrocatalytic Amplification of Iridium Oxide (IrO_x) Single Nanoparticle Collision on Copper Ultramicroelectrodes

Choi¹,

Jung²,

Joo³

et al. 2014

Bulletin of the Korean Chemical Society

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Recently, the observation of the electrocatalytic behavior of individual nanoparticles (NPs) by electrochemical amplification method has been reported. For example, the Iridium oxide (IrO x ) NP collision on the Pt UME was observed via electrocatalytic water oxidation. However, the bare Pt UME had poor reproducibility for the observation of NP collision signal and required an inconvenient surface pre-treatment for the usage. In this manuscript, we has been investigated other metal electrode such as Cu UME for the reproducible data analysis and convenient use. The IrO x NP collision was successively observed on the bare Cu UME and the reproducibility in collision frequency was improved comparing with previous case using the NaBH 4 pre-treated Pt UME. Also, the adhesion coefficient between NP and the Cu UME was studied for better understanding of the single NP collision system.

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“…, la cual también está asociada a la evolución de oxígeno (d), el pico a -0.538 V es debido a la reducción de Cu +2 a Cu + (e) y el situado a -0.830 V indica la reducción de Cu + a Cu 0 (f) 9,19,[23][24][25][26][27] . Las características de este voltamograma, incluido el área de los picos, dependen principalmente de la concentración de la base, del pH y de la velocidad de barrido de potencial.…”

Section: +2unclassified

Electrooxidación de glifosato sobre electrodos de níquel y cobre

Sierra¹,

Méndez²,

Sarria³

et al. 2008

Quím. Nova

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Recebido em 1/11/06; aceito em 10/8/07; publicado na web em 19/12/07 ELECTROOXIDATION OF GLYPHOSATE ON NIQUEL AND COPPER ELECTRODES. The electrochemical oxidation of glyphosate on an electrode of nickel and on one of copper was studied. With both electrodes electrochemical signals related to the glyphosate concentration were observed. However, the behaviour of the copper electrode was much better than that of the nickel electrode. A calibration curve was obtained of the electrical signal of this electrode as a function of the glyphosate concentration. The detection limit was 30 µM. In the case of nickel, an increase in the oxidation signal, which is related to the glyphosate concentration, was obtained. However, the results were less reproducible and additional information is necessary to propose an interaction mechanism between glyphosate and the electrode.Keywords: glyphosate; electrochemistry; copper. INTRODUCCIONEl glifosato (ácido fosfonometil amino acético, C 3 H 8 NO 5 P) es un herbicida sistémico, no selectivo, de amplio espectro y de extensa aplicación en agricultura. Su mecanismo de acción se basa en la inhibición de la enzima Enolpiruvilchiquimato-fosfato sintetasa (EPSP) la cual es esencial en la síntesis de los aminoácidos fenilalanina, tirosina y triptofano que son vitales para las plantas. Debido a este mecanismo, el glifosato es actualmente uno de los herbicidas más eficientes, de mayor comercialización, y de consideración inocua. Esto ultimo ha sido puesto en duda por estudios recientes que muestran que los pesticidas basados en glifosato afectan la regulación del ciclo celular de peces y anfibios, lo que sugiere un riesgo crónico de cáncer en los humanos 1 . A pesar de la magnitud de su aplicación, el glifosato es uno de los herbicidas menos monitoreado, pues su determinación y cuantificación no es sencilla debido a su alta solubilidad en agua, baja solubilidad en compuestos orgánicos, y gran capacidad para formar complejos muy estables con iones metálicos. Los métodos analíticos para monitorear el glifosato están basados en técnicas cromatográficas clásicas, cromatografía de gases y liquida con derivatización pre o post columna, también se emplean estas técnicas acopladas a espectrometría de masas (MS), todas estas metodologías son costosas, usan solventes tóxicos y son altamente especializadas [2][3][4] . Por otro lado, la electroquímica es un área de la química que puede dar información respecto a la interacción de este herbicida con una superficie y además, bajo las condiciones adecuadas podría llegar a usarse como herramienta analítica para su cuantificación. Procesos tales como adsorción, formación de intermediarios y reacciones redox de este compuesto pueden estudiarse a partir de técnicas electroquímicas. No obstante, la electroquímica del glifosato no se ha investigado en profundidad, encontrándose solo unas pocas referencias en las cuales se lleva a cabo la determinación de este herbicida sobre electrodos de oro en condiciones hidrodinámicas y sobre electrodos de oro previa derivatiza...

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Electrochemical oxidation of mono- and disaccharides at fresh as well as oxidized copper electrodes in alkaline media

Cited by 129 publications

References 15 publications

Oxidation and photo-induced oxidation of glucose at a polyaniline film modified by copper particles

Oxidation and photo-induced oxidation of glucose at a polyaniline film modified by copper particles

Observation of Electrocatalytic Amplification of Iridium Oxide (IrO_x) Single Nanoparticle Collision on Copper Ultramicroelectrodes

Electrooxidación de glifosato sobre electrodos de níquel y cobre

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Electrochemical oxidation of mono- and disaccharides at fresh as well as oxidized copper electrodes in alkaline media

Cited by 129 publications

References 15 publications

Oxidation and photo-induced oxidation of glucose at a polyaniline film modified by copper particles

Oxidation and photo-induced oxidation of glucose at a polyaniline film modified by copper particles

Observation of Electrocatalytic Amplification of Iridium Oxide (IrOx) Single Nanoparticle Collision on Copper Ultramicroelectrodes

Electrooxidación de glifosato sobre electrodos de níquel y cobre

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Observation of Electrocatalytic Amplification of Iridium Oxide (IrO_x) Single Nanoparticle Collision on Copper Ultramicroelectrodes