Abstract
A carbon paste electrode modified with 1-methyl-3-butylimidazolium bromide and CuO decorated single-wall carbon nanotubes (1-M-3-BIBr/CuO/SWCNTs/CPE) was utilized for nanomolar determination of amaranth in the presence of nitrite using square wave voltammetric (SWV) method. The structure of CuO/SWCNTs was investigated by SEM method. 1-M-3-BIBr/CuO/SWCNTs/CPE exhibited an enhancement in electro-oxidation current and active surface area. Also, 1-M-3-BIBr/CuO/SWCNTs/CPE exhibited indicated high catalytic activity toward the electro-oxidation of amaranth and simultaneous determination of it in the presence of nitrite. The 1-M-3-BIBr/CuO/SWCNTs/CPE achieved dynamic ranges 0.004–750 μM and 1.0–10,000 μM between the oxidation currents and the concentration of amaranth and nitrite, respectively. We obtained the detection limit of 1.0 nM and 0.5 μM for amaranth and nitrite, respectively. The 1-M-3-BIBr/CuO/SWCNTs/CPE was successfully applied to analysis of amaranth and nitrite in foodstuffs.
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This work did not receive support from the university, and research has been conducted in the Laboratory of Nano Sciences in Sari Branch, Islamic Azad University, Sari, Iran.
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Majede Bijad declares that he has no conflict of interest. Hassan Karimi-Maleh declares that he has no conflict of interest. Mohammad Farsi declares that he has no conflict of interest. Seyed-Ahmad Shahidi declares that he has no conflict of interest.
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Bijad, M., Karimi-Maleh, H., Farsi, M. et al. Simultaneous Determination of Amaranth and Nitrite in Foodstuffs via Electrochemical Sensor Based on Carbon Paste Electrode Modified with CuO/SWCNTs and Room Temperature Ionic Liquid. Food Anal. Methods 10, 3773–3780 (2017). https://doi.org/10.1007/s12161-017-0933-z
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DOI: https://doi.org/10.1007/s12161-017-0933-z