Laboratory of Mycotoxicology and Food Contaminants, Food Science and Technology Department, Center of Agricultural Sciences, Federal University of Santa Catarina, Florianopolis, Santa Catarina, Brazil.
Center of Structural Molecular Biology, Federal University of Santa Catarina, Florianopolis, Santa Catarina, Brazil.
Food Chem. 2016 Jul 15;203:246-251. doi: 10.1016/j.foodchem.2016.02.069. Epub 2016 Feb 10.
Pesticide insecticides are used on wheat grains in storage units but their efficiency is hindered by persistent residues in the grains. Therefore, this study aims to evaluate the effectiveness of ozone (O3) gas treatment on the degradation of residual bifenthrin and pirimiphos-methyl insecticides commonly used in storage wheat grains, as well as to evaluate degradation of their by-products. The residues of bifenthrin decreased after 180 min of exposure in a concentration of 60 μmol/mol (a 37.5 ± 7.4% reduction) with 20% moisture content and 0.9 water activity. On the other hand, under the same experimental conditions, the pirimiphos-methyl residues significantly decreased in the wheat grains (71.1 ± 8.6%) after 30 min of exposure. After O3 gas treatment, three by-products of pirimiphos-methyl (m/z=306.1) containing different molecular mass to charge ratios (m/z=278.1, 301.1 and 319.2) were identified by LC-MS. O3 is a strong oxidizer that has shown the potential to reduce pesticide residues in stored grain in order to ensure food quality and safety.
储粮单位中使用杀虫剂来防治储粮害虫，但杀虫剂在谷物中的持续残留会降低其防治效果。因此，本研究旨在评估臭氧（O3）气体处理对常用的储粮小麦中残留的联苯菊酯和吡虫啉杀虫剂的降解效果，以及评估其副产物的降解效果。在 20%水分含量和 0.9 水活度下，浓度为 60 μmol/mol 时，暴露 180 min 后，联苯菊酯的残留量减少了 37.5 ± 7.4%。另一方面，在相同的实验条件下，吡虫啉在小麦中的残留量在 30 min 暴露后显著降低（71.1 ± 8.6%）。臭氧气体处理后，通过 LC-MS 鉴定出吡虫啉的三种副产物（m/z=306.1），它们具有不同的质荷比（m/z=278.1、301.1 和 319.2）。臭氧是一种强氧化剂，已显示出有潜力降低储存谷物中的农药残留，以确保粮食质量和安全。
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