Abstract
High-performance liquid chromatography/quadrupole time-of-flight mass spectrometry (HPLC/QTOF–MS) is reported for quantitative determination of pesticide residues in apples. After a simple, rapid extraction, 300 mg MgSO4, 50 mg primary secondary amine (PSA), and 250 mg octadecyl (C18) were used for sample clean-up to ensure efficient recovery. The pesticides were quantified by HPLC/QTOF–MS using high-resolution multiple reaction monitoring (HR-MRM). Matrix-matched external standard calibration was used for quantitative analysis. The developed method was validated by spiking blank samples with the analytes and provided satisfactory accuracy verified by recoveries from 78.9% to 109.4% and good precision (relative standard deviation ≤12.4%). The limits of quantification for all analytes were between 0.85 and 3.0 µg/kg. The method was successfully applied to the analysis of forty batches of real samples, demonstrating its effectiveness for routine application.
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