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Electrochemical Study of Pyridoxine (Vitamin B 6 ) in Acetonitrile
Author(s) -
Lee Jazreen H. Q.,
Yue Yanni,
Ganguly Rakesh,
Webster Richard D.
Publication year - 2015
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201402340
Subject(s) - pyridoxine , chemistry , cyclic voltammetry , electrolysis , electrochemistry , inorganic chemistry , acetonitrile , bulk electrolysis , voltammetry , electrode , adsorption , nuclear chemistry , chromatography , organic chemistry , biochemistry , electrolyte
Cyclic voltammetry (CV) and controlled potential electrolysis (CPE) experiments revealed that at a Pt electrode, pyridoxine undergoes a one‐electron chemically irreversible oxidation at approximately 0.50 V versus Fc/Fc + , likely generating a dimeric product. Fouling of the electrode surface could be detected with repeated scans during CV and during preparative scale CPE oxidation experiments. These adsorption effects were overcome by performing bulk oxidation of pyridoxine with NOSbF 6 as a chemical oxidant. At Pt electrodes, a cathodic wave associated with the reduction of pyridoxine was detected at approximately −1.60 V versus Fc/Fc + . The reduction process appeared to be chemically reversible on the shorter timeframe of CV, but not under the prolonged timescale of CPE. The reduction of pyridoxine involves a direct discharge of pyridoxine at the Pt surface, generating an oxide anion, which upon treatment with iodomethane yields N ‐methylated pyridoxine rather than its O ‐methylated analogue.