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Voltammetric Method for the Simultaneous Determination of Melatonin and Pyridoxine in Dietary Supplements Using a Cathodically Pretreated Boron‐doped Diamond Electrode
Author(s) -
Alpar Nurcan,
Pınar Pınar Talay,
Yardım Yavuz,
Şentürk Zühre
Publication year - 2017
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/elan.201700077
Subject(s) - cyclic voltammetry , pyridoxine , voltammetry , chemistry , diamond , boron , electrode , detection limit , square wave , electrochemistry , nuclear chemistry , chromatography , analytical chemistry (journal) , organic chemistry , biochemistry , physics , voltage , quantum mechanics
Abstract The simultaneous voltammetric determination of melatonin (MT) and pyridoxine (PY) has been carried out at a cathodically pretreated boron‐doped diamond electrode. By using cyclic voltammetry, a separation of the oxidation peak potentials of both compounds present in mixture was about 0.47 V in Britton‐Robinson buffer, pH 2. The results obtained by square‐wave voltammetry allowed a method to be developed for determination of MT and PY simultaneously in the ranges 1–100 μg mL −1 (4.3×10 −6 –4.3×10 −4 mol L −1 ) and 10–175 μg mL −1 (4.9×10 −5 –8.5×10 −4 mol L −1 ), with detection limits of 0.14 μg mL −1 (6.0×10 −7 mol L −1 ) and 1.35 μg mL −1 (6.6×10 −6 mol L −1 ), respectively. The proposed method was successfully to the dietary supplements samples containing these compounds for health‐caring purposes.