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1、620S.C.Cunhaetal.J.Sep.Sci.2007,30,620–6321SaraC.CunhaOriginalPaper2StevenJ.Lehotay2KaterinaMastovskaJosØO.Fernandes1EvaluationoftheQuEChERSsamplepreparationMariaBeatriz1approachfortheanalysisofpesticideresiduesinP.P.Oliveiraolives1REQUIMTE/ServiçodeBromatologia,Faculdadede
2、Thispaperdescribestheuseofaquick,easy,cheap,effective,rugged,andsafe(QuE-Farmµcia,UniversidadedoChERS)methodforextractionandcleanupof16pesticideresiduesofinterestinoli-Porto,Porto,Portugal2UnitedStatesDepartmentofvesandoliveoil.Theseproductscontainahighlipidcontent,whichcan
3、adverselyAgriculture,Agriculturalaffectpesticiderecoveriesandharmtraditionalchromatographicsystems.ForResearchService,Easternextraction,themainfactors(oilandwatercontent)werestudiedandoptimizedinRegionalResearchCenter,experimentstomaximizepesticiderecoveries.DispersiveSPEwi
4、thdifferentsor-Wyndmoor,PA,USAbentswasalsoinvestigatedtominimizematrixcoextractivesandinterferences.Foranalysis,anewautomatedDSIdevicewastestedinGC-MStoavoidnonvolatilecoex-tractivesfromcontaminatingtheinstrument.LC-MS/MSwithpositiveESIwasusedforthosepesticidesthatwerediffi
5、culttodetectbyGC-MS.Thefinalmethodwasvalidatedforolivesintermsofrecoveries,repeatabilities,andreproducibilitiesusingbothdetectiontechniques.Theresultsdemonstratedthatthemethodachie-vedacceptablequantitativerecoveriesof70–109%withRSDsa20%forDSI-GC-MSand88–130%withRSDsa10%for
6、LC-MS/MS,andLOQatorbelowtheregulatorymaximumresiduelimitsforthepesticideswereachieved.Keywords:Directsampleintroduction/Gaschromatography-massspectrometry/Liquidchroma-tography-tandemmassspectrometry/Multiresiduepesticideanalysis/Oliveoil/Received:October5,2006;revised:Nove
7、mber10,2006;accepted:November12,2006DOI10.1002/jssc.2006004101Introductioncidesalsotendstoimprovethequalityoftheresultingoliveoil.Currently,itisconventionalpracticeforoliveTheolivetree,longemployedasasymbolofwisdomandgrowerstoapplypesticidestotheirtrees,andthusitispeace,ist
8、heoldestknowncultivatedtreeinhistory[1].necessarytomonitorandcontrolresiduallevels
