Electrocatalytic oxidation of d-galactose in alkaline medium

Parpot, Píer; Pires, S.G.; Bettencourt, Ana Paula

doi:10.1016/j.jelechem.2003.11.053

Cited by 43 publications

(46 citation statements)

References 7 publications

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“…From their studies of galactose oxidation on Au, they concluded that the process was catalysed by the presence of hydrous gold oxides as already described by others. The product analyses by HPLC showed a high yield of galactonic acid after prolonged electrolysis [39]. In the case of mannose, the highest yield was observed for mannonic acid in agreement with previously suggested mechanism of mannose oxidation.…”

Section: Figsupporting

confidence: 89%

“…Ideally it is preferred that the oxidation products and electron balance be carried out at the same time to facilitate mechanistic studies. However, most researchers have focussed on one component, with Parpot et al reporting an impressive list of products after chromatographic analyses (see Table 1) [39][40][41]. From their studies of galactose oxidation on Au, they concluded that the process was catalysed by the presence of hydrous gold oxides as already described by others.…”

Section: Figmentioning

confidence: 83%

“…systematically investigated the oxidation of D-mannose, D-galactose, Dsorbitol, D-gluconic acid, D-glucose-6-phosphate, D-glucuronic acid, 1,6-anhydro-β-D-glucose, methyl-β-D-glucopyranoside and 2-deoxy-D-glucose in 0.1 M NaOH solution [39][40][41]. Their approach was based upon measuring the possible oxidation products rather than evaluate the number of electrons.…”

Section: Figmentioning

confidence: 99%

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Recent progress in electrochemical oxidation of saccharides at gold and copper electrodes in alkaline solutions

Torto

2009

Bioelectrochemistry

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Section: Figsupporting

confidence: 89%

Section: Figmentioning

confidence: 83%

Section: Figmentioning

confidence: 99%

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Recent progress in electrochemical oxidation of saccharides at gold and copper electrodes in alkaline solutions

Torto

2009

Bioelectrochemistry

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“…While at the potential of -0.8 V up to + 0.3 V, represents the changing process of Ni(OH) 2 to Ni(OH) 2 , where Ni(OH) 2 was easily change to Ni(OH) 2 . A1 peak represents the oxidation process of Ni(OH) 2 to NiOOH [10,[24][25][26][27][28].…”

Section: Electrochemical Testsmentioning

confidence: 99%

Characterization of Ni-Co-PVC and Ni-Cu-PVC Alloys Prepared By Mechanical Alloying Technique (MAT)~!2008-04-10~!2008-07-03~!2008-08-05~!

Riyanto¹,

Othman²

2010

TOMSJ

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Abstract:A study was carried out to characterize Ni-Co-PVC and Ni-Cu-PVC composite materials prepared by mechanical alloying technique (MAT) using SEM, EDS and electrochemical test. Composite materials were prepared by mixing together 95% of metal powder (Ni+Co or Ni+Cu) with 5% PVC. PVC was used as a binder and tetrahydrofuran (THF) was used as a solvent in composite material preparation. Based on the SEM and EDS studies on those composite materials, both Ni-Co-PVC and Ni-Cu-PVC composite materials were found to be homogeneous and composed of aggregation of nickel and Co particles separated by gaps of PVC. The electrochemical test found that the response is very good in KOH and ethanol solution. Based on the CV, Ni-Co-PVC and Ni-Cu-PVC composite materials showed a synergistic effect as the electrocatalyst. Applications of these materials are as an electrode for electrocatalyst in fuel cell and for electrosynthesis of organic compounds.

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“…Numerous studies on the anode reaction of direct alcohol fuel cell [1][2][3] bear testimony to the former application, while studies on carbohydrate oxidation on different electrodes are aimed at the latter purpose [4][5][6][7][8][9][10][11][12][13] as well as for specific synthetic goals. [14][15][16][17][18] Oxide electrodes are likely to be suitable for carbohydrate oxidation because these molecules are expected to get easily adsorbed on the oxide layer by formation of hydrogen bonds via the OH groups, which facilitate electron transfer. 19,20 In recent years, oxidation processes at copper, nickel, and nickel hydroxide electrodes in alkaline solution have received considerable attention because of their application to the detection of carbohydrates and related compounds in liquid chromatography [21][22][23][24][25][26][27][28][29] and capillary electrophoresis the fact that carbohydrates are not generally electroactive at the carbon electrodes commonly used for detection in flow systems.…”

Section: Introductionmentioning

confidence: 99%

Kinetic study of electrocatalytic oxidation of carbohydrates on cobalt hydroxide modified glassy carbon electrode

Karim‐Nezhad

Hasanzadeh

Saghatforoush

et al. 2009

J. Braz. Chem. Soc.

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Este estudo investigou a oxidação eletrocatalítica de frutose, sacarose, glucose, lactose, arabinose e maltose em nanopartículas de hidróxido de cobalto eletrodepositadas na superfície de eletrodo de carbono vítreo em soluções alcalinas. Voltametria cíclica (VC), cronoamperometria (CA) e também medidas de polarização de estado estacionário foram empregados. Nos estudos de VC, na presença de carboidrato, o aumento na corrente de pico da oxidação do hidróxido de cobalto é seguido pelo decréscimo na correspondente corrente catódica. Isto indica que os carboidratos foram oxidados pelo mediador redox, o qual foi imobilizado na superfície do eletrodo, via um mecanismo eletrocatalítico. Com o uso da equação de Laviron, os valores dos coeficientes de transferência de elétron, anódicos e catódicos, e a constante da razão de transferência de carga para as espécies redox imobilizadas foram determinadas como 0,71 ± 0,03, 0,33 ± 0,03 e 0,21 ± 0,02 s This study investigated the electrocatalytic oxidation of fructose, sucrose, glucose, lactose, arabinose and maltose on nanoparticles of cobalt hydroxide electrodeposited on the surface of glassy carbon electrode in alkaline solutions. Cyclic voltammetry (CV), chronoamperometry (CA) techniques and also steady state polarization measurements have been employed. In CV studies, in the presence of carbohydrate the increase of the peak current of the oxidation of cobalt hydroxide is followed by a decrease in the corresponding cathodic current. This indicates that carbohydrates were oxidized by the redox mediator which was immobilized on the electrode surface via an electrocatalytic mechanism. With the use of Laviron's equation, the values of anodic and cathodic electron-transfer coefficients and charge transfer rate constant for the immobilized redox species were determinated as 0.71 ± 0.03, 0.33 ± 0.03 and 0.21 ± 0.02 s -1 , respectively. The rate constant, the electron transfer coefficient and the diffusion coefficients involved in the electrocatalytic oxidation of carbohydrates were determined.

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Electrocatalytic oxidation of d-galactose in alkaline medium

Cited by 43 publications

References 7 publications

Recent progress in electrochemical oxidation of saccharides at gold and copper electrodes in alkaline solutions

Recent progress in electrochemical oxidation of saccharides at gold and copper electrodes in alkaline solutions

Characterization of Ni-Co-PVC and Ni-Cu-PVC Alloys Prepared By Mechanical Alloying Technique (MAT)~!2008-04-10~!2008-07-03~!2008-08-05~!

Kinetic study of electrocatalytic oxidation of carbohydrates on cobalt hydroxide modified glassy carbon electrode

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