Determination of neonicotinoid pesticide residues in vegetables and fruits with solid phase extraction and liquid chromatography mass spectrometry.
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.
Obana
Hirotaka
H
Osaka Prefectural Institute of Public Health, 1-3-69 Nakamichi, Higashinari, Osaka 5370025, Japan. obana@iph.pref.osaka.jp
Okihashi
Masahiro
M
Akutsu
Kazuhiko
K
Kitagawa
Yoko
Y
Hori
Shinjiro
S
D002849:Chromatography, Gas / Q000379:methods; D005506:Food Contamination / Q000032:analysis*; D005638:Fruit / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D007306:Insecticides / Q000032:analysis; D010573:Pesticide Residues / Q000032:analysis*; D013997:Time Factors; D014675:Vegetables / Q000737:chemistry*
D007306:Insecticides; D010573:Pesticide Residues