*2.3. Extraction and Analysis of the Pesticide Residues*

The extraction was performed using the QuEChERS (Quick, Easy, Cheap, Effective, Rugged, Safe) method [21]. Briefly, the washed samples (100 g) were homogenized and processed using a blender. Thereafter, 10 g of the sample was placed in 50 mL centrifuge tubes and mixed with 10 mL of acetonitrile. The tube was sealed and vigorously shaken in a shaker (VIBA X.30, Collomix, Gaimersheim, Germany) for 1 min. The extraction salt kit was subsequently added. The mixture was shaken vigorously for 1 min and then centrifuged (Avanti J-15R, Beckman Coulter, Brea, CA, USA) at 4000× *g* for 10 min. A 1 mL aliquot of the supernatant was transferred to a 2 mL centrifuge tube containing a dSPE kit. The 2 mL centrifuge tube was then shaken for 1 min and centrifuged (Microfuge 20R, Beckman Coulter, Brea, CA, USA) for 5 min at 10,000× *g*. Finally, the supernatant was filtered through a 0.2 μm membrane into a chromatography vial for analysis.
