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Multiresidue analysis of over 200 pesticides in cereals using a QuEChERS and gas chromatography–tandem mass spectrometry-based method

2014; Elsevier BV; Volume: 169; Linguagem: Inglês

10.1016/j.foodchem.2014.07.102

1873-7072

Zeying He, Lu Wang, Yi Peng, Ming Luo, Wenwen Wang, Xiaowei Liu,

Pharmacological Effects and Assays

A simple and high-throughput multiresidue pesticide analysis method was developed and validated for 219 pesticides in cereals (corn, wheat flour and rice) based on QuEChERS (quick, easy, cheap, effective, rugged, and safe) procedure combined with gas chromatography–triple quadrupole mass spectrometry (GC–MS/MS). Different buffer system (acetate- and citrate-buffered) and sample to solvent ratios (sample amount) were compared in the modified QuEChERS procedure to get better recovery and clean-up results. The limits of quantification (LOQ) ranged between 5 and 50 μg kg−1, and for the majority of the pesticides the LOQ were 5 μg kg−1, which were below the regulatory maximum residue limits. The coefficient of determination (r2) was >0.99 within the calibration linearity range of 2–200 μg kg−1 for the majority of the pesticides. Most recoveries at 5, 10, 20, 50, 100 and 200 μg kg−1 were in the range 70–120% (n = 6) with associated RSDs < 20% indicating satisfactory accuracy.