Rapid monitoring of fungicide fenhexamid residues in selected berries and wine grapes by square-wave voltammetry at carbon-based electrodes

• Published in: Food chemistry 2021-02, Vol.338, p.127975-127975, Article 127975
• Main Authors: Brycht, Mariola, Łukawska, Anna, Frühbauerová, Michaela, Pravcová, Kateřina, Metelka, Radovan, Skrzypek, Sławomira, Sýs, Milan
• Format: Article
• Language: English
• Subjects: Carbon-based electrodes; Fenhexamid; Food safety; Pesticides; Square-wave voltammetry
• ISSN: 0308-8146; 1873-7072
• DOI: 10.1016/j.foodchem.2020.127975

[Display omitted] •New, simple, and rapid electrochemical method for determination of fenhexamid residues.•Suitable for analysis of foodstuffs such as blueberries, strawberries, and wine grapes.•Rinsed screening voltammetric method could be employed in food safety laboratories.•Fully comparable to reference reversed-phase high performance liquid chromatographic method.•Electrochemical reaction mechanism of fungicide fenhexamid was proposed. A completely new electroanalytical method for the determination of fenhexamid (FNX) residues in fruit samples has been developed. This method is based on anodic oxidation of fungicide in Britton-Robinson buffer (pH 4) containing 10% (v/v) methanol using square-wave voltammetry when five different carbon-based electrodes were tested. An electrochemical behaviour of FNX was studied on a glassy carbon electrode using cyclic voltammetry, while glassy carbon paste electrode was selected for analytical purposes. Linear range for FNX from 3.96 to 49.50 µmol L−1 characterized by coefficient of determination of 0.9964, sensitivity of 0.176 µA L µmol−1, and detection limit of 1.32 µmol L−1 were calculated. Results acquired from analyses of blueberries and wine grapes were compared to those obtained by a reference chromatographic method, and a satisfactory agreement has been reached. Finally, it seems that the present voltammetric approach could find its application in food quality control as screening assay.