ChemInform Abstract: 1,5-Diselenacylooctane. Reversible Electrochemical Oxidation with Remarkably Low Oxidation Potential in Dialkyl Selenides.

Non-enzymatic saccharide sensors are of great interest in diagnostics, but their non-selectivity limits their practical diagnostic abilities. In this study, we investigated the electrochemical oxidation of monosaccharides at nanoporous gold (NPG) catalysts with different contributions of surface crystallographic orientations. Fructose elicited no clear electrochemical response, but glucose, galactose, and mannose produced clear oxidative current. The onset potentials for oxidation of these saccharides depended on the surface atomic structure of the NPG. The oxidation potential was approximately 100 mV less positive at the Au(100)-enhanced NPG than at the Au(111)-enhanced NPG. Furthermore, the voltammetric responses significantly differed among the saccharides. Galactose was oxidized at less positive potential and exhibited a higher current response than the other saccharides. This tendency was enhanced in the presence of chloride ions. These features enabled the selective and sensitive detection of galactose at an NPG electrode without enzymes under physiological conditions. A linear range of 10 μM to 1.8 mM was obtained in the calibration plot, which was comparable to those in previously reported enzymatic galactose sensors. Thus, we demonstrated that controlling the crystallographic orientation on the nanostructured electrode surface is useful in developing electrochemical sensors.

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Study of Methylene Blue Degradation Using Mediated Electrochemical Oxidation With Ce (IV) Ions: Effect of Supporting Electrolyte, Ce (III) Concentration, and Oxidation Potential

Proceedings of the Proceedings of the 7th Mathematics, Science, and Computer Science Education International Seminar, MSCEIS 2019, 12 October 2019, Bandung, West Java, Indonesia ◽

10.4108/eai.12-10-2019.2296387 ◽

2020 ◽

Author(s):

Ummu Rokhima ◽

Henry Setiyanto ◽

Muhammad Zulfikar ◽

Vienna Saraswaty ◽

Nandang Mufti

Keyword(s):

Methylene Blue ◽

Electrochemical Oxidation ◽

Supporting Electrolyte ◽

Oxidation Potential ◽

Methylene Blue Degradation ◽

Mediated Electrochemical Oxidation

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The relationship between antioxidant activity, first electrochemical oxidation potential, and spin population of flavonoid radicals

Archives of Industrial Hygiene and Toxicology ◽

10.2478/aiht-2019-70-3290 ◽

2019 ◽

Vol 70 (2) ◽

pp. 134-139 ◽

Cited By ~ 2

Author(s):

Ante Miličević

Keyword(s):

Antioxidant Activity ◽

Electrochemical Oxidation ◽

Atomic Orbital ◽

Oxidation Potential ◽

Trolox Equivalent Antioxidant Capacity ◽

Reducing Ability ◽

Trolox Equivalent ◽

Spin Populations ◽

The One ◽

Semi Empirical

AbstractI have shown that by averaging antioxidant activity (AA) values measured by different methods it is possible to obtain an excellent correlation (R2=0.960) between the first electrochemical oxidation potential, Ep1, and AA. Separate correlations using the AA values obtained with each of the four methods [R2 were 0.561 for diphenyl-1-picrylhydrazyl (DPPH), 0.849 for Folin Ciocalteu reagent (FCR), 0.848 for the ferric-reducing ability of plasma (FRAP), and 0.668 for the Trolox equivalent antioxidant capacity (TEAC)] were all worse, and in some cases not useful at all, such as the one for DPPH. Also, the sum of atomic orbital spin populations on the carbon atoms in the skeleton of radicals ( s(C) Σ AOSPRad), calculated with the semi-empirical parameterisation method 6 (PM6) in water, was used to correlate both Ep1 and AA, yielding R2=0.926 and 0.950, respectively. This showed to be a much better variable for the estimation of Ep1 and AA than the bond dissociation energy (BDE), R2=0.854 and 0.901 for Ep1 and AA, respectively, and especially the ionisation potential (IP), R2=0.445 and 0.435 for Ep1 and AA, respectively.

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