Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 51, Issue 9, Pages 2501-2505Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf0261102
Keywords
neonicotinoid; pesticide; insecticide; nitenpyram; thiamethoxam; imidacloprid; acetamiprid; thiacloprid; LC-MS; food
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A rapid and simple extraction method for the simultaneous analysis of five neonicotinoid insecticides has been developed. Twelve different fruit and vegetable matrixes were extracted with methanol and cleaned up using a graphitized carbon solid phase extraction cartridge loading with a 20% methanol solution. The concentrated eluate after methanol elution was then analyzed for pesticide residues by liquid chromatography/mass spectrometry in the APCI positive mode. The five pesticides including nitenpyram, thiamethoxam, imidacloprid, acetamiprid, and thiacloprid were recovered at 70-95% at spike levels of 0.1 and 1 mg/kg in bell pepper, cucumber, eggplant, grape, grapefruit, Japanese radish, peach, pear, potato, rice, and tomato. Relative standard deviations were less than 10% for all of the recovery tests. The proposed method is fast, easy to perform, and could be utilized for regular monitoring of pesticide residues.
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