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  • Title: Graphene-based pipette tip solid-phase extraction with ultra-high performance liquid chromatography and tandem mass spectrometry for the analysis of carbamate pesticide residues in fruit juice.
    Author: Shi Z, Li Q, Xu D, Huai Q, Zhang H.
    Journal: J Sep Sci; 2016 Nov; 39(22):4391-4397. PubMed ID: 27647795.
    Abstract:
    Graphene-based pipette tip solid-phase extraction was combined with ultra-high performance liquid chromatography and tandem mass spectrometry for the determination of carbamate pesticide residues in fruit juice samples. Four milligrams of graphene was used as sorbent material to pack a 1000 μL pipette tip for the extraction of pirimicarb, propoxur, isoprocarb, fenobucarb, and diethofencarb from 3 mL of fruit juice sample. The whole extraction process was finished in 12 min, and the volume of eluent used was only 1.5 mL. Under the optimized conditions, good linear relationship (R > 0.999) and lower limits of detection (0.0022-0.033 ng/mL) were achieved. The recoveries at three spiked levels ranged from 80.90 to 124.60% with relative standard deviations less than 4.88%. Compared with commercially available sorbents including propylsulfonic acid silica, graphitized carbon black, and C18 , graphene was superior in extraction efficiency. The proposed method is simple, rapid, sensitive, selective, and solvent saving.
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