Development of QuEChERS-DLLME method for determination of neonicotinoid pesticide residues in grains by liquid chromatography-tandem mass spectrometry.
Monitoring neonicotinoid residues in grains is of significant interest for the proper assessment of pesticide exposure to human. The quick, easy, cheap, effective, rugged, and safe extraction method combined with dispersive liquid-liquid micro-extraction (QuEChERS-DLLME) was developed for extracting, purifying, and concentrating seven common neonicotinoid pesticides from the grains (rice, millet, and maize). Water and acetonitrile were used in tandem as extractants in QuEChERS, while water, acetonitrile, and trichloromethane in DLLME acted as the external phase, dispersant, and extractant, respectively. Comprehensive consideration of the single factor test and response surface method to optimize parameters including type and volume of extractants and dispersant. The evaluation showed that the QuEChERS-DLLME method held excellent linearity (R2 > 0.99). The limits of quantitation ranged from 0.003 to 0.08 µg kg-1 for the seven insecticides. The recoveries were in the range of 62-118%, and good reproducibility was obtained with a relative standard deviation below 15%.
['Ma|Lingfei|L|', 'Wang|Yanfei|Y|', 'Li|Haipu|H|', 'Peng|Fangyuan|F|', 'Qiu|Bo|B|', 'Yang|Zhaoguang|Z|']
D000097:Acetonitriles D002853:Chromatography, Liquid D002523:Edible Grain D005506:Food Contamination D007306:Insecticides D057230:Limit of Detection D059627:Liquid Phase Microextraction D000073943:Neonicotinoids D012275:Oryza D010573:Pesticide Residues D015203:Reproducibility of Results D053719:Tandem Mass Spectrometry D003313:Zea mays
QuEChERS-DLLME Neonicotinoids Grains Central composite design Plackett-Burman