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Electrocatalytic oxidation of pyridoxine (vitamin B6) on aluminum electrode modified by metallic palladium particles/iron (III) hexacyanoferrate (II) film

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Abstract

The electrocatalytic activity of a Prussian blue (PB) film on the aluminum electrode by taking advantage of the metallic palladium characteristic as an electron-transfer bridge (PB/Pd–Al) for electrooxidation of 2-methyl-3-hydroxy-4,5-bis (hydroxyl–methyl) pyridine (pyridoxine) is described. The catalytic activity of PB was explored in terms of FeIII [FeIII (CN)6]/FeIII [FeII (CN)6]1− system. The best mediated oxidation of pyridoxine (PN) on the PB/Pd–Al-modified electrode was achieved in 0.5 M KNO3 + 0.2 M potassium acetate of pH 6 at scan rate of 20 mV s−1. The mechanism and kinetics of the catalytic oxidation reaction of PN were monitored by cyclic voltammetry and chronoamperometry. The results were explained using the theory of electrocatalytic reactions at chemically modified electrodes. The charge transfer-rate limiting reaction step is found to be a one-electron abstraction, whereas a two-electron charge transfer reaction is the overall oxidation reaction of PN by forming pyridoxal. The value of α, k, and D are 0.5, 1.2 × 102 M−1 s−1, and 1.4 × 10−5 cm2 s−1, respectively. Further examination of the modified electrodes shows that the modifying layers (PB) on the Pd–Al substrate have reproducible behavior and a high level of stability after posing it in the electrolyte or Pyridoxine solutions for a long time.

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Authors and Affiliations

  1. Electroanalytical Chemistry Laboratory, Faculty of Chemistry, University of Tabriz, Tabriz, Iran

    M. H. Pournaghi-Azar, H. Dastangoo & M. Ziaei

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  1. M. H. Pournaghi-Azar
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  2. H. Dastangoo
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  3. M. Ziaei
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Correspondence to M. H. Pournaghi-Azar.

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Pournaghi-Azar, M.H., Dastangoo, H. & Ziaei, M. Electrocatalytic oxidation of pyridoxine (vitamin B6) on aluminum electrode modified by metallic palladium particles/iron (III) hexacyanoferrate (II) film. J Solid State Electrochem 11, 1221–1227 (2007). https://doi.org/10.1007/s10008-007-0273-9

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  • DOI: https://doi.org/10.1007/s10008-007-0273-9

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