Citation: CHEN Ting, XU Yanli, ZHANG Wen, YAN Jun, PENG Tao. Determination of 34 pesticide residues in plant-derived foods by automated QuEChERS sample preparation system combined with high performance liquid chromatography-tandem mass spectrometry[J]. Chinese Journal of Chromatography, ;2019, 37(9): 1019-1025. doi: 10.3724/SP.J.1123.2019.02010 shu

Determination of 34 pesticide residues in plant-derived foods by automated QuEChERS sample preparation system combined with high performance liquid chromatography-tandem mass spectrometry

Lanzhou Institutes for Food and Drug Control, Lanzhou 730050, China

Received Date: 21 February 2019

Fund Project: the Youth Science and Technology Innovation Project of Gansu Food and Drug Administration (No. 2018GSFDA045)

An analytical method for the determination of 34 pesticide residues in plant-derived foods was established using an automated QuEChERS sample preparation system combined with high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS). The sample extraction and dispersive solid-phase extraction in the manual QuEChERS method were combined using the vortex vibration and centrifugation functions of the automated QuEChERS sample preparation system. The operating parameters and pretreatment steps were optimized, and the analytes were detected in the multiple reaction monitoring (MRM) mode. The quantification analysis was performed by the matrix-matched external standard method. The automated and the manual QuEChERS methods were compared from the methodological verification standpoint. The calibration curves showed good linearity in a certain range, and the correlation coefficients (R²) were greater than 0.99. The limits of detection and limits of quantification were 0.76-3.60 μg/kg and 2.28-10.80 μg/kg, respectively. Moreover, the recoveries ranged from 53.0% to 125.2%, and the relative standard deviations (RSDs) were less than 1.59% (n=5). The results obtained by the manual QuEChERS method were not significantly different from those obtained by the automated QuEChERS method. This method can effectively reduce the labor intensity and probability of error in the determination of pesticide residues.
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