![]() ![]() Five days after spraying, the residue of spinetoram decreased more than 99% throughout the process from spraying to tea infusion, indicating that spinetoram has a lower residue amount in tea and tea infusion. The degradation rates (DRs) of total spinetoram in green tea and black tea processing were 34.9%–57.8% and 36.9%–68.2%, and the transfer rates (TRs) were 5.1%–21.5% and 6.3%–27.7% from green tea and black tea into their infusion, respectively. The dissipation study showed that the half-life of spinetoram in fresh tea leaves was 0.70 d, and the metabolites N-formyl-XDE-175-J and N-demethyl-XDE-175-J were generated in tea growth. The degradation and metabolism of spinetoram in tea growth, processing and brewing were studied and analyzed by a modified QuEChERS coupled with UPLC-MS/MS method for the first time. ![]()
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