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1、粮油检验大全（Inspectionofcerealsandoils）.txtthemostpreciousthingintheworldisnotwhatyoucannevergetorwhatyouget,butwhatyouhavegainedandmayloseatanymoment!Loveisalamp,whilefriendshipistheshadow.Whenthelampisoff,youwillfindtheshadoweverywhere.Friendiswhocangiveyoustrengthat
2、last.Thefattyacidvalue,iodinevalue,peroxidevalue,saponificationvalueandotherindicatorsofsignificanceAcidvaluereferstothenumberofmilligramsofpotassiumhydroxiderequiredtoneutralizethefreeacidinthe1gmaterial.Theamountofacidvaluereflectstheamountofacidinthefat.Iodinev
3、aluereferstothe100gmaterialwiththeadditionofiodineconsumedpergramofiodine.Theiodinevalueisusedforthedeterminationofunsaturatedfattyoiloranindicatorofthepropertyandtomeasureoil.Saponificationvaluereferstothenumberofmilligramsofpotassiumhydroxideconsumedwhenthe1gmat
4、erialiscompletelysaponified.Saponificationvaluesareusuallyusedtoindicatetheaveragemolecularweightofoilsorfats,indicatingtheamountoffreeandcombinedfattyacidsin1goils.Generallyspeaking,whentheamountoffreefattyacidsislarge,thesaponificationvalueishigher.Peroxidevalue
5、referstotheamountofperoxideinasubstance.Forexample,toohighperoxidevalueisakindoffood,thefoodhasrancidity,peoplewilleatwhatthecausediarrhea.Experimenttwenty-two(newfoodinspectiontest,Chen*,theacidvalueofoilranciditytestDeterminationoflipidperoxidevalue,greaseimpuri
6、ties*determinationofadulteration*________________________________________First,thepurposeandrequirementsoftheexperiment1.Grasptheinspectionmethodsofgrainandgrease.2.Masterthepreparationmethodoftestreagent.Two,thenewgrain,ChenShiyan(guaiacol)(a)determinationprincip
7、le:theuseofnewgrainintheperoxidaseactivityofperoxidaseactivitywashigher,lowerorevenlosethecharacteristicsoftheold.Inthepresenceofhydrogenperoxide,guaiacolwasoxidizedbyperoxidasetoproducereddishbrownfourguaiacol.Themorefreshthegrain,thehighertheperoxidaseactivityan
8、dtheshorterthecoloringtime,thedeeperthereddishbrowncontentofthereactionproducts.Therefore,thefreshnessofthegraincanbedetermined.(two)instrument:2cylinde
