(2) The samples were comminuted, and 10 g of each sample was then placed into 50 ml polyethylene tube. Samples were extracted and cleaned up immediately after sampling using QuEChERs methodology (Anastassiades et al., 2002). 15 ml of acetonitrile was added into each tube. The samples were well shaken using a vortex mixer at maximum speed. Afterwards, 6 g of anhydrous
magnesium sulfate and 1.5 g of sodium chloride were added, then extracted by shaking vigorously on vortex for 5 m and centrifuged for 10 m at 4,000 rpm. An aliquot of 4 ml was transferred from the supernatant to a new clean 15 ml centrifuge tube containing 100 mg PSA and 600 mg anhydrous magnesium sulfate. The samples were again vortexed for 3 m and then centrifuged for 10 m at 4,000 rpm. Sodium Chloride saturated solution (35%) was used for washed and slated method. Peeled method was done by the use of a sharp knife; the samples were taken through the whole samples preparation mentioned above. In general, each sample was conducted in three replicates