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第四组--张昊伟史俊芬岳丽丽闫兴华赵志远FoodChemistry158(2014)229–238ContentslistsavailableatScienceDirectFoodChemistryjournalhomepage:/locate/foodchemEf?cientpreparativeisolationandidenti?cationofwalnutbioactivecomponentsusinghigh-speedcounter-currentchromatographyandLC-ESI-IT-TOF-MSMaryH.Grace,CharlesW.Warlick,ScottA.Neff,MaryAnnLila?PlantsforHumanHealthInstitute,FoodBioprocessingandNutritionalSciences,NorthCarolinaStateUniversity,NorthCarolinaResearchCampus,Kannapolis,NC28081,USAarticleinfoArticlehistory:Received11December2013Receivedinrevisedform7February2014Accepted19February2014Availableonline1March2014Keywords:WalnutJuglansregiaEllagitanninsHigh-speedcounter-currentchromatographyESI-MS/MSabstractPreparativeisolationofcomplexmixturesofcompoundsfromwalnutpolarextractswasestablishedbyacombinationofhigh-speedcounter-currentchromatography(HSCCC)andelectrosprayionization-iontrap-timeof?ightmassspectrometry(ESI-IT-TOF-MS).Compoundswereisolatedafterasolventoptimi-sationselectionbasedonsolutedistributioninabiphasicsolventsystem.IsolationwasachievedthroughoneortwosuccessiveHSCCCruns,and?nalpuri?cationonSephadexLH-20.Isolatedcompoundsincludedellagitannins(1–11),gallicacid(12),dicarboxylicacidglucosides(13–15),hydrojuglonegluco-side(16),catechin(17),procyanidinB2(18),andmegasteroneglucosides(19–20).PraecoxinD(4)wasisolatedforthe?rsttimefromwalnut,whilepraecoxinAmethylester(5)andglansregininAn-butylester(14)arenewlyidenti?edcompounds.Thepurityandidentityofisolatedcompoundswerecon-?rmedbyNMRandHPLC-ESI-MS/MS.Theseresultsprovidedafoundationforindepthcharacterisationofwalnutcompoundsandofferedanef?cientstrategyforisolationofpotentiallyhealth-relevantphyto-chemicalsfromwalnuts.。2014ElsevierLtd.Allrightsreserved.IntroductionWalnuts(JuglansregiaL.)areanexcellentsourceofessentialunsaturatedfattyacids(linoleicanda-linolenicacids),tocophe-rols,andthestrongantioxidanthormone,melatonin(Amaral,Casal,Pereira,Seabra,Oliveira,2003;Kornsteiner,Wagner,Elmadfa,2006).Amongtreenuts,walnutisoneofthetwohighestran
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