DILAURYL THIODIPROPIONATE-硫代二丙酸二月桂酯.pdf

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1、DILAURYLTHIODIPROPIONATEPreparedatthe17thJECFA(1973),publishedinFNP4(1978)andFNP52(1992).Metalsandarsenicspecificationsrevisedatthe61stJECFA(2003).AnADIof0-3mg/kgbwwasestablishedatthe17thJECFA(1973)SYNONYMSINSNo.389DEFINITIONEsterofthiodipropionicacidandafoodgradelaurylalcoholC

2、hemicalnamesDidodecyl3,3'-thiodipropionicacid,dilaurylesterofß,ß'-thiodi-propionicacidC.A.S.number123-28-4ChemicalformulaC30H58O4SStructuralformulaFormulaweight514.86AssayNotlessthan99%DESCRIPTIONWhitecrystallineflakeshavingacharacteristicsweetishester-likeodourFUNCTIONALUSESAn

3、tioxidantCHARACTERISTICSIDENTIFICATIONSolubility(Vol.4)Insolubleinwater,solubleinethanolandetherSolidificationpointoNotbelow40(Vol.4)Saponificationvalue205-215(Vol.4)PURITYAcidityNotmorethan0.2%(asthiopropionicacid)To50mlofamixtureof1partofmethanoland3partsofbenzene,add5dropsof

4、phenolphthaleinTSandneutralizewithethanolicpotassiumhydroxide.Add2g,accuratelyweighed,ofthesample,swirltodissolveandtitratewith0.1Nethanolicpotassiumhydroxide.Eachmlof0.1Nethanolicpotassiumhydroxideisequivalentto8.91mgC6H10O4S.Lead(Vol.4)Notmorethan2mg/kgDetermineusinganatomica

5、bsorptiontechniqueappropriatetothespecifiedlevel.TheselectionofsamplesizeandmethodofsamplepreparationmaybebasedontheprinciplesofthemethoddescribedinVolume4,“InstrumentalMethods.”METHODOFWeighout0.700gofthesample,transfertoa250-mlErlenmeyerflask,addASSAY100mlofaceticacidand50mlo

6、fethanol,andheatthemixturegentlyuntilthesampledissolvescompletely.Add3mlofhydrochloricacidand4dropsofp-ethoxy-chrysoidinTSandimmediatelytitratewith0.1Nbromide-bromateTS.Astheend-pointisapproached(pinkcolour),add4moredropsoftheindicatorsolutionandcontinuethetitration,dropwise,to

7、acolourchangefromredtopaleyellow.Performablankdeterminationandmakeanynecessarycorrection.Eachmlof0.1Nbromide-bromateTSisequivalentto25.74mgofC30H58O4S.ConverttopercentageandsubtractthiodipropionicacidcontentdeterminedintheAciditytesttoobtainpercentageofC30H58O4S.