Electrocatalytic Oxidation of Vitamin B6 on a Chemically Modified Electrode

Jyh-Myng  Zen; Jyh-Cheng Chen; Annamalai Senthil Kumar

doi:10.6180/jase.2002.5.4.03

Electrocatalytic Oxidation of Vitamin B6 on a Chemically Modified Electrode

Proposed mediated reaction mechanism for the oxidation of pyridoxine to pyridoxal derivative at the NCME. An octahedral site of Ru present at the pyrochlore network is expected to participate in the oxidation kinetics

Jyh-Myng Zen ¹, Jyh-Cheng Chen¹ and Annamalai Senthil Kumar¹

¹Department of Chemistry National Chung Hsing University Taichung, Taiwan 402, R.O.C.

Received: October 1, 2002
Accepted: October 31, 2002
Publication Date: December 1, 2002

Download Citation: ||https://doi.org/10.6180/jase.2002.5.4.03

ABSTRACT

The electrocatalytic oxidation of vitamin B6 (pyridoxine hydrochloride) was demonstrated on a Nafion/lead ruthenate pyrochlore modified electrode (designated as NCME) by cyclic voltammetry. The catalytic activity of vitamin B6 was explored in terms of the higher oxidation state of ruthenium species, i.e., Py-Ru^IV/Ru^VI in the pyrochlore network (Py). The mediated mechanism was derived by Michaelis-Menten kinetics. The calculated kinetics values by direct Michaelis-Menten method are Michaelis-Menten rate constant (Km) = 4.05 mmol dm^-3, catalytic rate constant (kc) = 2.05×10-1 s ^-1, and heterogeneous electro- chemical rate constant (k’ME) = 4.09×10-2 cm s^-1.

Keywords: Vitamin B6, Electrocatalysis, Chemically Modified Electrode

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