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http://dx.doi.org/10.7585/kjps.2016.20.2.93

Development of Simultaneous Analytical Method for Determination of Isoxaflutole and its Metabolite (Diketonitrile) residues in Agricultural Commodities Using LC-MS/MS  

Ko, Ah-Young (Pesticide and Veterinary Drug Residues Division, National Institute of Food and Drug Safety Evaluation, Department of Food Safety Evaluation, Ministry of Food and Drug Safety)
Kim, Heejung (Pesticide and Veterinary Drug Residues Division, National Institute of Food and Drug Safety Evaluation, Department of Food Safety Evaluation, Ministry of Food and Drug Safety)
Do, Jung Ah (Pesticide and Veterinary Drug Residues Division, National Institute of Food and Drug Safety Evaluation, Department of Food Safety Evaluation, Ministry of Food and Drug Safety)
Jang, Jin (Pesticide and Veterinary Drug Residues Division, National Institute of Food and Drug Safety Evaluation, Department of Food Safety Evaluation, Ministry of Food and Drug Safety)
Lee, Eun-Hyang (Pesticide and Veterinary Drug Residues Division, National Institute of Food and Drug Safety Evaluation, Department of Food Safety Evaluation, Ministry of Food and Drug Safety)
Ju, Yunji (Pesticide and Veterinary Drug Residues Division, National Institute of Food and Drug Safety Evaluation, Department of Food Safety Evaluation, Ministry of Food and Drug Safety)
Kim, Ji Young (Imported Food Analysis Division, Seoul Regional Food and Drug Administration)
Chang, Moon-Ik (Pesticide and Veterinary Drug Residues Division, National Institute of Food and Drug Safety Evaluation, Department of Food Safety Evaluation, Ministry of Food and Drug Safety)
Rhee, Gyu-Seek (Pesticide and Veterinary Drug Residues Division, National Institute of Food and Drug Safety Evaluation, Department of Food Safety Evaluation, Ministry of Food and Drug Safety)
Publication Information
The Korean Journal of Pesticide Science / v.20, no.2, 2016 , pp. 93-103 More about this Journal
Abstract
A simultaneous analytical method was developed for the determination of isoxaflutole and metabolite (diketonitrile) in agricultural commodities. Samples were extracted with 0.1% acetic acid in water/acetonitrile (2/8, v/v) and partitioned with dichloromethane to remove the interference obtained from sample extracts, adjusting pH to 2 by 1 N hydrochloric acid. The analytes were quantified and confirmed via liquid chromatograph-tandem mass spectrometer (LC-MS/MS) in positive-ion mode using multiple reaction monitoring (MRM). Matrix matched calibration curves were linear over the calibration ranges ($0.02-2.0{\mu}g/mL$) for all the analytes into blank extract with $r^2$ > 0.997. For validation purposes, recovery studies were carried out at three different concentration levels (LOQ, 10LOQ, and 50LOQ) performing five replicates at each level. The recoveries were ranged between 72.9 to 107.3%, with relative standard deviations (RSDs) less than 10% for all analytes. All values were consistent with the criteria ranges requested in the Codex guideline (CAC/GL40, 2003). Furthermore, inter-laboratory study was conducted to validate the method. The proposed analytical method was accurate, effective, and sensitive for isoxaflutole and diketonitrile determination in agricultural commodities.
Keywords
Agricultural commodities; Analytical method; Diketonitrile; Isoxaflutole; LC-MS/MS;
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