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Analytical and Bioanalytical Electrochemistry، جلد ۱۴، شماره ۱۲، صفحات ۱۱۲۶-۱۱۳۷
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عنوان انگلیسی Melatonin Determination at Trace Levels by ErO2/MnO2 Nanocomposite Modified Carbon Paste Electrode
چکیده انگلیسی مقاله A new method based on a carbon paste electrode, modified with ErO2/MnO2 nanocomposite was introduced for melatonin determination. The differential Pulse Voltammetry (DPV) method was found to be a suitable analytical technique to acquire an enhanced electro-oxidation signal and thus it was chosen as the signal recording method. The nanocomposite w:as char:acterized using Scanning electron microscopy and X-ray diffraction analysis method. The electrocatalytic activity of the carbon paste electrode modified with ErO2/MnO2-CPE toward melatonin electro-oxidation was substantiated utilizing DPV and electrochemical impedance spectroscopy ((EIS). The EIS technique gave a clear indication for the intensification the of charge transfer rate by the nanocomposite described. Different parameters, affecting the electrode efficiency were investigated and optimized. Using DPV and ErO2/MnO2-CPE, a linear dynamic range of 4.0×10-8-2.0×10-5 mol L-1 as well as a detection limit of 6.0×10-9 mol L-1 was obtained for melatonin measurement. The relative standard deviation percentage (RSD%) of four repeated measurements was found to be about 4.08%. The developed method was used for the estimation of melatonin amount in urine samples which led to satisfactory results.
کلیدواژه‌های انگلیسی مقاله Melatonin,Erbium dioxide,Manganese dioxide,sensor,Differential pulse voltammetry
نویسندگان مقاله Taher Alizadeh |
Department of Analytical Chemistry, Faculty of Chemistry, University College of Science, University of Tehran, Tehran, Iran P.O. Box 14155-6455, Tehran, Iran

Somayeh Amjadi |
Department of Analytical Chemistry, Faculty of Chemistry, University College of Science, University of Tehran, Tehran, Iran P.O. Box 14155-6455, Tehran, Iran

Maedeh Akhoundian |
Department of Analytical Chemistry, Faculty of Chemistry, University College of Science, University of Tehran, Tehran, Iran P.O. Box 14155-6455, Tehran, Iran

نشانی اینترنتی https://www.abechem.com/article_700911_23a82eb97f8079eaa23b5bef56dc9568.pdf
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