The role of incipient hydrous oxides in the oxidation of glucose and some of its derivatives in aqueous media

Burke, L.D.; Ryan, T. G.

doi:10.1016/0013-4686(92)87008-n

Cited by 48 publications

(20 citation statements)

References 29 publications

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“…As a matter of fact, glucose oxidation at these electrode systems is generally carried out in strong alkaline media [12][13][14]. Three effects force to adopt similar conditions [15,16]: (i) OH − species are required to neutralize the protons generated during the dehydrogenation steps; (ii) the rate of formation of a more easily oxidized reaction intermediate, namely enediol, is higher in alkaline solutions; (iii) the rate of formation of hydrous Au oxides, constituting the actual electrocatalytic sites for glucose oxidation, depends on the solution pH.…”

Section: Introductionmentioning

confidence: 99%

Electroanalytical applications of a graphite–Au nanoparticles composite included in a sonogel matrix

Crespo-Rosa

Zanardi

ElKaoutit

et al. 2014

Electrochimica Acta

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Section: Introductionmentioning

confidence: 99%

Electroanalytical applications of a graphite–Au nanoparticles composite included in a sonogel matrix

Crespo-Rosa

Zanardi

ElKaoutit

et al. 2014

Electrochimica Acta

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“…An incipient hydrous oxide/adatom mediator model was taken to explain the electrochemical behavior of glucose on Au electrode in alkaline solution [8,37,38], which can be divided into four stages: (1) electrosorption of glucose at low potential and formation of its two-electron oxidation product gluconolactone due to partial oxidation of glucose. It is believed that such products would accumulate on electrode surface and occupy the active sites of Au electrode and, thus, inhibit the direct oxidation of glucose; (2) ] ads in this potential region are believed to catalyze oxidation of glucose [27]; (4) regeneration of OH ad active sites from reducing surface Au oxides in the negative potential scan and directly oxidizing glucose again.…”

Section: Electrochemical Oxidation Of Glucose At the Npg And Coo X /Nmentioning

confidence: 99%

“…For comparison, the CV curves of NPG and CoO x /GC were also listed. NPG electrode displayed a pair of broad pre-redox peaks with small current between À0.6 V and 0 V, which were ascribed to gold adatoms (Au ad ) and the incipient hydrous gold oxide [Au + (OH 2 ) n ] premonolayer [27,28]. Exhibited in the relatively high potential region were the main peaks for the redox pair of Au/Au oxides at 0.37/ 0.03 V, which showed much higher currents in comparison with CoO x /NPG electrode.…”

Section: Preparation and Electrochemical Characterization Of Coo X /Nmentioning

confidence: 99%

Electrochemical Fabrication of Cobalt Oxides/Nanoporous Gold Composite Electrode and its Nonenzymatic Glucose Sensing Performance

Zhou

Tang²,

Xia

et al. 2016

Electroanalysis

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A nonenzymatic glucose sensor was successfully established by electrochemically decorating cobalt oxides (CoOx) on a nanoporous gold electrode (NPG) using cobalt hexacyanoferrate (CoHCF) as a precursor. It exhibited high sensitivity and long‐term stability as well as satisfactory quantification of glucose concentration in human serum samples. The morphology and surface analysis of the resulting CoOx/NPG were carefully characterized. Two detection methods, cyclic voltammetry and amperometry, were employed to evaluate the performance of CoOx/NPG towards glucose sensing in alkaline solution. Using cyclic voltammetry, at −0.5 V, the glucose partial oxidation peak current is linear to the glucose concentration up to 14 mM with a sensitivity of 283.7 µA mM−1 cm−2. A linear amperometric response at 0.55 V was obtained in the glucose concentration range from 2 µM to 2 mM with a sensitivity of 2025 µA mM−1 cm−2 and a response time <3 s.

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“…During the initial scan, the Au NPs can be oxidized to AuOH, and in this process the Au center attains a highly oxidizing Au(I) state [40,41]. With glucose addition, the deprotonation of glucose molecules in an alkaline medium triggers isomerization to an enediol form, which in contact with Au(I) is oxidized to gluconolactone, and then further hydrolyzes to gluconic acid [42].…”

Section: Electrocatalytic Oxidation Of Glucosementioning

confidence: 99%

Monitoring of glucose in fermentation processes by using Au/TiO2 composites as novel modified electrodes

et al. 2015

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This paper demonstrates an effective method of monitoring glucose in fermentation processes based on the development of enzyme-free glucose electrochemical sensors. The sensing electrodes were manufactured by preparing size-controlled Au nanoparticles (NPs), in the form of colloidal solutions, which were dispersed on TiO 2 substrates, and then deposited on commercial carbon screen printed electrodes. The as-synthesized samples were fully characterized by transmission electron microscopy, X-ray diffraction, atomic absorption spectroscopy, and UV-visible diffuse reflectance spectroscopy to obtain information about their morphological, structural, and electronic properties. Particularly, the ability to control the size of Au NPs in the colloidal solution by using different reducing agents and stabilizers is presented here. The Au/ TiO 2 -based modified sensors were assembled and tested for glucose monitoring in an alkaline solution. Results of cyclic voltammetry showed the high electrocatalytic activity of these sensors toward glucose oxidation, whereas no response was detected toward ethanol. This suggests the possibility of using this type of sensor for glucose monitoring in the fermentation processes without ethanol interference. The efficient sensing properties of Au NPembedded TiO 2 composites may be ascribed to the higher electrocatalytic activity of smaller Au NPs stabilized on TiO 2 .

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The role of incipient hydrous oxides in the oxidation of glucose and some of its derivatives in aqueous media

Cited by 48 publications

References 29 publications

Electroanalytical applications of a graphite–Au nanoparticles composite included in a sonogel matrix

Electroanalytical applications of a graphite–Au nanoparticles composite included in a sonogel matrix

Electrochemical Fabrication of Cobalt Oxides/Nanoporous Gold Composite Electrode and its Nonenzymatic Glucose Sensing Performance

Monitoring of glucose in fermentation processes by using Au/TiO2 composites as novel modified electrodes

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