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  • Title: Monitoring residue levels and dietary risk assessment of pymetrozine for Chinese consumption of cauliflower.
    Author: Jia G, Zeng L, Zhao S, Ge S, Long X, Zhang Y, Hu D.
    Journal: Biomed Chromatogr; 2019 Apr; 33(4):e4455. PubMed ID: 30536397.
    Abstract:
    The present study investigates the occurrence of pymetrozine residues in cauliflower samples obtained from six cauliflower-producing areas of China during fixed time periods in 2017 and estimates the dietary risk of pymetrozine in cauliflower. A liquid chromatography with tandem mass spectrometry method was developed and validated to detect pymetrozine in cauliflower. The samples were extracted using 20 mL of acetonitrile and purified with dispersive solid-phase extraction using C18 as sorbent. The limit of quantification of pymetrozine was 0.008 mg/kg in cauliflower. The recoveries of the analyte were 82.04-95.18% with RSD <8.45%. The calibration curves for pymetrozine showed good linearities in the concentration range 0.004-2.0 mg/L with determination coefficients (R2 ) >0.999. Pymetrozine dissipated rapidly in cauliflower with a half-life of <4 days. The terminal residues of pymetrozine were <0.008-0.0881 mg/kg in cauliflower at 7, 10 and 14 days after spraying from six sites. The routine washing process removed about half amount of the pymetrozine in cauliflower; the reduction ratios were 51.0-52.8%. The dietary risk assessment indicated that pymetrozine did not exhibit obvious dietary health risks in cauliflower when good agricultural practices were implemented.
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