Determination of pesticide residues in rice bran oil by dispersive solid phase extraction coupled with gas chromatography-tandem mass spectrometry
A novel dispersive solid-phase extraction method using metal-organic framework materials(MOFs)UiO-66 as adsorbent was developed for the enrichment and extraction of target pesticide residues in rice bran oil.The method was combined with gas chromatography triple tandem quadrupole mass spectrometry(GC-MS/MS)for detection.The results showed that the method has good linearity with linear correlation coefficients ranged from 0.999 2 to 0.999 8.The limits of detection(LODs)for the pesticides were in the range of 0.357～1.824 ng·g-1,and the limits of quantification(LOQs)were in the range of 1.19～6.08 ng·g-1.The accuracy and precision of the method were assessed by performing spiked recovery experiments.The recoveries of pesticides ranged from 74.1%to 116.9%.The precision of the intra-day experiments ranged from 2.1%to 6.1%,and the precision of the inter-day experiments ranged from 8.3%to 12.7%,which met the requirements of pesticide residue analysis(RSD≤20%).The method was also applied to the detection of target pesticide residues in four different brands of rice bran oil.
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