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稻谷在碾米加工中镉的含量和分布研究.docx

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稻谷在碾米加工中镉的含量和分布研究 Title:AStudyontheContentandDistributionofCadmiuminRiceduringMillingandProcessing Introduction: Riceisoneofthemostconsumedstaplefoodsworldwide,makingitvitaltoensureitssafetyandquality.Cadmium(Cd)isaheavymetalthatposespotentialhealthriskstohumanswhenconsumedathighlevels.Thus,understandingthecontentanddistributionofCdduringricemillingandprocessingisessentialforfoodsafetyandthedevelopmentofpropermitigationstrategies. Methods: ToinvestigatethecontentanddistributionofCdinriceduringmillingandprocessing,aseriesofexperimentswereconducted.First,samplesofricegrainswerecollectedfromdifferentsourcesknowntobepronetoCdcontamination,suchasindustriallypollutedareasorregionswithsoilenrichedinCd.Thesesampleswerethenprocessedinalaboratorysettingtosimulatecommonmillingandprocessingtechniques,includinghulling,polishing,andwhitening. Results: TheresultsofthestudyrevealedsignificantvariationsinCdcontentatdifferentstagesofriceprocessing.Initially,theCdcontentwasobservedtobehigherinunprocessedricegrains,particularlyintheouterlayerssuchasthehullandbran,duetothetendencyofCdtoaccumulateintheseparts.Asthemillingandprocessingprogressed,theCdcontentdecreasedconsiderably.Hullingandpolishing,whichinvolvedremovingtheouterlayers,ledtoanotablereductioninCdcontent.Additionally,thewhiteningprocessfurtherreducedtheCdcontentasitinvolvedremovingtheremainingbran. ThedistributionofCdwithinricegrainswasalsoinvestigated.ItwasfoundthatCdwaspredominantlyconcentratedintheouterlayers,withlowerlevelsdetectedintheendosperm.Thisdistributionpatternalignedwithpreviousstudiesonotherheavymetalsinricegrains. Discussion: TheobservedreductioninCdcontentduringricemillingandprocessingcanbeattributedtotheremovaloftheouterlayers,whereCdtendstoaccumulate.Hulling,polishing,andwhiteningprocesseseffectivelyreducedtheoverallCdcontentinrice.However,itisimportanttonotethatevenafterprocessing,traceamountsofCdmaystillremainintheendosperm. TheresultsofthisstudyhighlighttheimportanceofriceprocessinginreducingCdcontaminati