Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou, China.
J Sci Food Agric. 2020 Apr;100(6):2358-2363. doi: 10.1002/jsfa.10179. Epub 2020 Feb 12.
Methoxyfenozide possesses efficacy against a variety of lepidopteron pests, including the major pests in cauliflower and tea, so it is of great importance to generalize the practical use of methoxyfenozide in the field.
An efficient method was developed and validated in both vegetable matrix and extract-rich matrix (cauliflower and tea) using modified QuEChERS combined with UPLC/MS/MS analysis. The recoveries in cauliflower, made tea and tea shoots ranged from 94.5 to 108.0%, from 85.0 to 91.6% and from 77.3 to 82.0% respectively, with relative standard deviations (RSDs) below 17.3% in all cases. The field results showed that methoxyfenozide dissipated in cauliflower with half-life (t ) at 2.5-3.5 days and in tea with t at 1.2 days. Combining the above experimental data and statistical food intake values, the risk quotient (RQ) values were significantly lower than 1.
The quantification method of methoxyfenozide in cauliflower or tea has not been established until this study. The dissipation and dietary exposure risk assessment of methoxyfenozide in cauliflower and tea were investigated in the field. Methoxyfenozide dissipated rapidly in cauliflower despite different climates, and it dissipated faster in tea. The dietary risk of methoxyfenozide through cauliflower or tea was negligible to humans. This study not only provides guidance for the safe use of methoxyfenozide but also serves as a reference for the establishment of maximum residue limits (MRLs) in China. © 2019 Society of Chemical Industry.
甲氧虫酰肼对包括菜花和茶在内的多种鳞翅目害虫具有防治效果，因此在田间推广甲氧虫酰肼的实际应用非常重要。
在蔬菜基质和富含提取物的基质（菜花和茶）中，采用改良的 QuEChERS 与 UPLC/MS/MS 分析相结合，建立并验证了一种有效的方法。在菜花、茶叶和茶芽中的回收率分别为 94.5%至 108.0%、85.0%至 91.6%和 77.3%至 82.0%，所有情况下相对标准偏差（RSD）均低于 17.3%。田间结果表明，甲氧虫酰肼在菜花中的半衰期（t ）为 2.5-3.5 天，在茶中的半衰期（t ）为 1.2 天。结合上述实验数据和统计的食物摄入量值，风险商（RQ）值明显低于 1。
直到本研究为止，尚未建立菜花或茶中甲氧虫酰肼的定量方法。在田间调查了甲氧虫酰肼在菜花和茶中的消解和膳食暴露风险评估。甲氧虫酰肼在不同气候下在菜花中迅速消解，在茶中消解更快。通过菜花或茶摄入甲氧虫酰肼对人类的膳食风险可以忽略不计。本研究不仅为甲氧虫酰肼的安全使用提供了指导，也为中国制定最大残留限量（MRLs）提供了参考。© 2019 化学工业协会。
