【摘 要】
：
A novel, simple and rapid method has been developed to screen for the presence of 44 pesticide residues in tobacco. The method uses a new sample preparation procedure loosely based on QuEChERS (Quick,
【机 构】
：
Tianjin Entry & Exit Inspection and Quarantine Bureau, Tianjin 300461,China
【出 处】
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2011食品安全技术与标准国际研讨会暨AOAC中国区年会
论文部分内容阅读
A novel, simple and rapid method has been developed to screen for the presence of 44 pesticide residues in tobacco. The method uses a new sample preparation procedure loosely based on QuEChERS (Quick, Easy,Cheap, Effective, Rugged and Safe) methodology. The pesticides are extracted with acetonitrile and purified via a mixed sorbents of primary secondary amine (PSA), octadecyl silane (C18) and graphitized carbon black (GCB). Analysis is performed by ultra performance liquid chromatography tandem mass spectrometry (UPLC-MS/MS). AH pesticides are monitored in the positive or negative ionization mode in a single run due to the fast polarity switching capability of the mass spectrometer. Two precursor-product ion transitions are monitored for each compound in the multi-reaction monitoring (MRM) mode. Quantification is carried out using matrix-matched standards calibration. The method has been validated for the tobacco types of Burley, Oriental and Virginia from different countries. Recoveries of the proposed method for the spiked samples ranged from 71.1％ to 109.8％ and relative standard deviations (RSD) are below 10％. The limits of quantification (LOQ) are all below the guidance residue levels proposed by the Agrochemical Advisory Committee of CORESTA.
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