AZORUBINE-偶氮玉红，淡红.pdf

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1、AZORUBINEPreparedatthe28thJECFA(1984),publishedinFNP31/1(1984)andinFNP52(1992).Metalsandarsenicspecificationsrevisedatthe59thJECFA(2002).AnADIof0-4mg/kgbwwasestablishedatthe27thJECFA(1983)SYNONYMSCIFoodRed3,Carmoisine,CI(1975)No.14720,INSNo.122DEFINITIONConsistsessentiallyofdisodium4-hydroxy-3-(

2、4-sulfonato-1-naphthylazo)-1-naphthalenesulfonateandsubsidiarycolouringmatterstogetherwithsodiumchlorideand/orsodiumsulfateastheprincipaluncolouredcomponents.MaybeconvertedtothecorrespondingaluminiumlakeinwhichcaseonlytheGeneralSpecificationsforAluminiumLakesofColouringMattersshallapply.Chemical

3、namesDisodium4-hydroxy-3-(4-sulfonato-1-naphthylazo)-1-naphthalenesulfonateC.A.S.number3567-69-9ChemicalformulaC20H12N2Na2O7S2StructuralformulaFormulaweight502.44AssayNotlessthan85%totalcolouringmattersDESCRIPTIONRedpowderorgranulesFUNCTIONALUSESColourCHARACTERISTICSIDENTIFICATIONSolubility(Vol.

4、4)Solubleinwater,sparinglysolubleinethanolIdentificationofcolouringPassestestmatters(Vol.4)PURITYLossondrying(Vol.4)Notmorethan15%at135°togetherwithchlorideandsulfatecalculatedassodiumsaltsWaterinsolublematterNotmorethan0.2%(Vol.4)Lead(Vol.4)Notmorethan2mg/kgDetermineusinganatomicabsorptiontechn

5、iqueappropriatetothespecifiedlevel.TheselectionofsamplesizeandmethodofsamplepreparationmaybebasedontheprinciplesofthemethoddescribedinVolume4,“InstrumentalMethods.”SubsidiarycolouringmattersNotmorethan1%(Vol.4)Usethefollowingconditions:Developingsolvent:No.4Heightofascentofsolventfront:approxima

6、tely17cmOrganiccompoundsotherNotmorethan0.5%of4-Amino-1-naphthalenesulfonicacidandthancolouringmatters4-Hydroxy-1-naphthalenesulfonicacidtogether(Vol.4)UseHPLCunderthefollowingconditions:HPLCelutiongradient:1to100%at2.0%permin(exponential)UnsulfonatedprimaryNotmorethan0.01%calculatedasanilineofa

7、romaticamines(Vol.4)EtherextractablematterNotmorethan0.2%(Vol.4)METHODOFASSAYProceedasdirectedunderTotalContentbyTitrationwithTitanousChlorideinVolume4,usingthefollowing:Weightofsample:0.5-0.6gBuffer:15gsodiumhydrogentartrat