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Direct electrochemical sensing for oxytetracycline in food using a zinc cation-exchanged montmorillonite
Abstract Direct voltammetric determination of oxytetracycline (OTC) at a zinc cation-exchanged montmorillonite modified glassy carbon electrode (Zn-Mt/GCE) was described. The OTC yielded one well-defined oxidation peak at the Zn-Mt/GCE. The experimental parameters, which influence the voltammetric responses of OTC, e.g., the pH value, scan rate and accumulation condition, were optimized. The oxidation peak current changed with the OTC concentration over the range from 0.80 to 40μM. The detection limit was 0.12μM for an accumulation time of 4min. The coefficient of variation, determined at 10μM OTC, was 3.4% (n=10). Using this method, OTC in the real food and feedstuff samples was determined.
Graphical abstract Display Omitted
Highlights Zn modified montmorillonite nanocomposite is prepared using cation-exchange method. The prepared Zn-montmorillonite is characterized by SEM, TEM, XRD and EIS. Zn-montmorillonite is used as a sensing film for the oxidation of oxytetracycline. The electrochemical oxidation mechanism of oxytetracycline is studied detailedly. Oxytetracycline contents in real food sample extract are successfully determined.
Direct electrochemical sensing for oxytetracycline in food using a zinc cation-exchanged montmorillonite
Abstract Direct voltammetric determination of oxytetracycline (OTC) at a zinc cation-exchanged montmorillonite modified glassy carbon electrode (Zn-Mt/GCE) was described. The OTC yielded one well-defined oxidation peak at the Zn-Mt/GCE. The experimental parameters, which influence the voltammetric responses of OTC, e.g., the pH value, scan rate and accumulation condition, were optimized. The oxidation peak current changed with the OTC concentration over the range from 0.80 to 40μM. The detection limit was 0.12μM for an accumulation time of 4min. The coefficient of variation, determined at 10μM OTC, was 3.4% (n=10). Using this method, OTC in the real food and feedstuff samples was determined.
Graphical abstract Display Omitted
Highlights Zn modified montmorillonite nanocomposite is prepared using cation-exchange method. The prepared Zn-montmorillonite is characterized by SEM, TEM, XRD and EIS. Zn-montmorillonite is used as a sensing film for the oxidation of oxytetracycline. The electrochemical oxidation mechanism of oxytetracycline is studied detailedly. Oxytetracycline contents in real food sample extract are successfully determined.
Direct electrochemical sensing for oxytetracycline in food using a zinc cation-exchanged montmorillonite
Sun, Junyong (author) / Gan, Tian (author) / Zhu, Haijing (author) / Shi, Zhaoxia (author) / Liu, Yanming (author)
Applied Clay Science ; 101 ; 598-603
2014-09-03
6 pages
Article (Journal)
Electronic Resource
English
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