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1、JOURNALOFCHROMATOGRAPHYAELSEVIERJournalofChromatographyA,697(1995)461-468Simultaneousdeterminationofglycerol,andmono-,di-andtriglyceridesinvegetableoilmethylestersbycapillarygaschromatographyChristinaPlank*,EberhardLorbeerInstituteofOrganicChemistry,UniversityofVienna,Wiihringerstrasse38,A-1090Vienn
2、a,AustriaAbstractAgaschromatographicprocedureforthesimultaneousdeterminationofglycerol,mono-,di-andtriglyceridesinvegetableoilmethylestershasbeendeveloped.Quantitativeinformationaboutthisgroupoforganiccontaminantsisveryimportantforthequalityoftheseoleochemicalproductswhenusedasautomotivedieselfuelsu
3、bstitutes.Trimethylsilylationofglycerol,mono-anddiglycerides,followedbyGCusinga10-mcapillarycolumncoatedwitha0.1-/xmfilmofDB-5allowsthedeterminationofallanalytesinasingleGCrun.Calibrationisperformedbyanalysisofstandardsolutionscontainingglycerol,mono-,di-andtrioleinaswellastwointernalstandards,1,2,4
4、-butanetriolandtricaprin.Therecoveryoftheprocedureatdifferentconcentrationlevelsandtherepeatabilityofthequantitativeresultsareevaluated.1.Introductionspecifications.Asaconsequence,continuousqualitycontroloftheseoleochemicalproductsisVegetableoilmethylesters(VOMEs),ob-essential.tainedbyalkali-catalyz
5、edtransesterificationofDuringthelastfewyears,severalanalyticalvegetableoilswithmethanol,canbesignificantlyprocedureshavebeendevelopedforboththecontaminatedwithglycerol,mono-,di-andtri-determinationofglycerolaswellasformono-,glyceridesduetoincompletetransesterificationdi-andtriglyceridesinVOMEs.Metho
6、ds,basedandinsufficientpurification.FortheuseasontheextractionofglycerolfromVOMEsintoautomotivedieselfuelsubstitutes,nowthemostanaqueousphaseanditssubsequentgaschro-importantfieldofapplication,thepresenceofmatographic(GC)analysis,weredescribedbytheseminorcomponentscanleadtoseriousBondiolietal.[3]and
7、H6dlandSchindlbauerengineproblemsandhazardousemissions[1].[4].AnenzymaticdeterminationofglycerolinLimitsforthepermissiblelevelsofglycerol,anaqueousextractoffattyacidmethylestersmono-,di-andtriglycerid
