Residue behavior and risk assessment of afidopyropen and its metabolite M440I007 in tea. (15th March 2023) - Guo, Mingming
Highlights: Tea residue behavior of afidopyropen insecticide and its metabolite was studied. Afidopyropen dissipated faster in tea during the rainy season than the dry season. Low infusion rates of afidopyropen and metabolite M440I007 were noted. Afidopyropen is recommended for pest control in tea gardens due to low health risk. Abstract: Afidopyropen, a novel insecticide, is highly effective against piercing insects such as the tea leafhopper. The residual levels of afidopyropen and M440I007 in tea cultivation, processing, and brewing were studied. During tea cultivation, afidopyropen dissipated faster in fresh tea shoots in the rainy season (T1/2 of 1.2–2.5 d) than that in the dry season (T1/2 of 3.1–4.4 d); afidopyropen was metabolized into M440I007, the level of which peaked in 1 d, and degraded rapidly (over 90 %) afterward 3 d. The green tea processing steps had little effect on decreasing the afidopyropen residue (PF of 0.90–1.18). Low infusion rates of afidopyropen (16.7 %–17.7 %) and M440I007 (4.1 %–6.2 %) were observed from dry green tea to infusion; furthermore, the risk of ingesting afidopyropen from drinking tea was low, with the risk quotient values < 0.0001. This study can offer guidance on the rational application of afidopyropen in tea plants.