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Poster Presentations
Day 2, June 23（Mon.）
Room P (Maesato East, Foyer, Ocean Wing)
- 2P-PM-21
Development and validation of neonicotinoid insecticides in rice and tea leaves using isotope-dilution-UHPLC-MS/MS
(1NYCU, 2NYC Univ.)
oCheng-Bin Zhan1, Yu-Fang Huang2
Neonicotinoids (NEOs), including acetamiprid (ACE), imidacloprid (IMI), dinotefuran (DIN), clothianidin, thiacloprid, nitenpyram, and thiamethoxam, are a class of neurotoxic insecticides developed in the 1980s to replace organophosphates and carbamates. We established and validated sensitive multi-residue analytical methods for identifying 7 NEOs in rice using FaPEx and tea leaves using QuEChERs and isotope-dilution ultra-high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS). The method featured satisfactory linearity (R2 > 0.995), and the limits of detection with two food matrices were 0.03-0.1 ng/g. The method showed an acceptable recovery between 88-114% in tea leaves and between 88-113% in rice. With a precision of ≤ 12% at the level of 20 ng/g in tea leaves and ≤ 13% at spiking levels of 4, 20, and 40 ng/g in rice. The validated method was used to analyze NEOs in 30 tea leaves and 33 rice randomly collected from supermarkets in Taiwan. 70% and 91% of samples in tea leaves and rice contained at least 1 NEOs. The mean levels of NEOs were 25 and 13 ng/g in tea leaves and rice, respectively. ACE, DIN, and IMI dominate the NEOs in food.