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1、CHLOROPHYLLS,COPPERCOMPLEXESPreparedatthe31stJECFA(1987),publishedinFNP38(1988)andinFNP52(1992).Metalsandarsenicspecificationsrevisedatthe59thJECFA(2002).AnADIof0-15mg/kgbwwasestablishedatthe13thJECFA(1969)SYNONYMSCopperchlorophyll,copperphaeophytin,CINaturalGreen3;
2、C.I.(1975)No.75810,INSNo.141DEFINITIONObtainedbyadditionofanorganicsaltofcoppertothesubstanceobtainedbysolventextractionofgrass,lucerne,nettleandotherplantmaterial;theproduct,fromwhichthesolventhasbeenremoved,containsotherpigmentssuchascarotenoidsaswellasfatsandwaxe
3、sderivedfromthesourcematerial;theprincipalcolouringmattersarethecopperphaeophytins.Onlythefollowingsolventsmaybeusedfortheextraction:Acetone,dichloromethane,methanol,ethanol,propan-2-olandhexane.Chemicalnames[Phytyl(1322R,17S,18S)-3-(8-ethyl-13-methoxycarbonyl-2,7,1
4、2,18-tetramethyl-11213-oxo-3-vinyl-13,13,17,18-tetra-hydrocyclopenta[at]-prophyrin-17-yl)propionate]copper(II)(Copperchlorophylla)22[Phytyl(13R,17S,18S)-3-(8-ethyl-7-formyl-13-methoxycarbonyl-2,12,18-112trimethyl-13-oxo-3-vinyl-13,13,17,18-tetrahydro-cyclopenta[at]p
5、rophyrin-17-yl)propionate]copper(II)(Copperchlorophyllb)C.A.S.number65963-40-8ChemicalformulaCopperphaeophytina:C55H72CuN405Copperphaeophytinb:C55H70CuN406StructuralformulawhereX=CH3forthe"a"compoundX=CHOforthe"b"compoundFormulaweightCopperphaeophytina:932.75Copperp
6、haeophytinb:946.73AssayNotlessthan10%oftotalcopperphaeophytinsDESCRIPTIONWaxysolidrangingincolourfrombluegreentodarkgreendependingonthesourcematerial.FUNCTIONALUSESColourCHARACTERISTICSIDENTIFICATIONSolubility(Vol.4)Insolubleinwater;solubleinethanol,diethylether,chl
7、oroalkanes,hydrocarbonsandfixedoilsSpectrophotometryA(1%,1cm)at422nminchloroformisnotlessthan54.(Vol.4)Thin-layerApplya1in20solutionofthesampleinchloroformasabandofthelengthofchromatography2cmtoaSilica60Cplate.Afterdrying,developtheplatebyamixtureof50%hexane,45%chlo
8、roformand5%ethanol(generalpurposereagentgradechloroformissuppliedwith2%ofaddedethanolasastabilizer.The5%ethanolinthesolventmixtureisinaddi
