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Voltammetric Detection of Vitamin B 1 at Carbon Paste Electrodes and Its Determination in Tablets
Author(s) -
Oni Joshua,
Westbroek Philippe,
Nyokong Tebello
Publication year - 2002
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/1521-4109(200209)14:17<1165::aid-elan1165>3.0.co;2-s
Subject(s) - electrode , carbon paste electrode , detection limit , voltammetry , chemically modified electrode , cyclic voltammetry , chemistry , working electrode , vitamin , buffer solution , inorganic chemistry , materials science , chromatography , electrochemistry , biochemistry
The voltammetric behavior of vitamin B 1 in alkaline medium at carbon paste electrode (CPE) is discussed. A method based on cyclic voltammetry for the determination of vitamin B 1 at carbon paste electrode modified with manganese phthalocyanine (MnPc‐CPE) is presented. In pH 10 buffer, the modified electrode showed catalytic activity towards the oxidation of vitamin B 1 by considerably increasing the oxidation current of one of the observed waves compared to the oxidation current obtained at an unmodified electrode. The modified electrode was stable towards the determination of vitamin B 1 compared to the unmodified electrode that is completely poisoned after a few scans. A linear relationship between the oxidation current and the concentration of vitamin B 1 in solution was observed. The detection limit for vitamin B 1 at the modified electrode was of the order of 10 −5 mol dm −3 . Commercial vitamin B 1 tablets were analyzed using the modified electrodes.