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Poster Presentations
Day 2, June 23（Mon.）
Room P (Maesato East, Foyer, Ocean Wing)
- 2P-PM-34
Dissipation and Metabolic Fate of Sulfoxaflor in Thistle and Olive
(1Kangwon Nat'l Univ., 2Konkuk Univ.)
oEun-Song Choi1, Min-Ho Song1, Ji-Woo Yu1,2, Jung-Hoon Lee1, Hui-Yeon Ahn2, Geon-Woo Park2, Ji-Won Shin2, Ji-Yeon Lee2, Ha-Jin Son2, Young-Soo Keum2, Ji-Ho Lee1
Residual pesticides pose potential health risks. To enhance food safety, many countries enforce residue limits through the Positive List System. However, minor crops like thistle and olive have limited registered pesticides, necessitating the establishment of maximum residue limits. This study analyzed sulfoxaflor dissipation, metabolic characteristics, and risk in thistle and olive.
To adjust for application rate variations, residue levels were normalized by dividing measured residues by the applied active ingredient. Initial normalized residue levels were 14.23 mg/kg/g in thistle and 2.54 mg/kg/g in olive, attributed to morphological differences. Metabolic analysis identified X11719474 as the primary metabolite in thistle, whereas in olive, X11719474 wasn't detected, suggesting distinct metabolic pathways. The half-life was 4.1 days in thistle and 14.7 days in olive. Under the worst exposure scenario (immediate post-application harvest), the hazard index for thistle, when consumed as tea, exceeded the safety threshold at 1.203. However, under realistic conditions, HI for thistle (harvested 3, 7, 14 days after application) and olive (7, 14, 21 days) remained below 0.5, indicating lower risk.
These findings provide fundamental data on sulfoxaflor residues and metabolism in different crops. Expanding pesticide registration for thistle and olive is essential for minor crop safety and agricultural competitiveness.