EN 1784:2003

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.NDLebensmittel - Nachweis von bestrahlten fetthaltigen Lebensmitteln - Gaschromatographische Untersuchung auf KohlenwasserstoffeProduits alimentaires - Détection d'aliments ionisés contenant des lipides - Analyse par chromatographie en phase gazeuse des hydrocarburesFoodstuffs - Detection of irradiated food containing fat - Gas chromatographic analysis of hydrocarbons71.040.50Fizikalnokemijske analitske metodePhysicochemical methods of analysis67.050Splošne preskusne in analizne metode za živilske proizvodeGeneral methods of tests and analysis for food productsICS:Ta slovenski standard je istoveten z:EN 1784:2003SIST EN 1784:2003en01-november-2003SIST EN 1784:2003SLOVENSKI
STANDARDSIST EN 1784:19981DGRPHãþD

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1784August 2003ICS 67.050Supersedes EN 1784:1996English versionFoodstuffs - Detection of irradiated food containing fat - Gaschromatographic analysis of hydrocarbonsProduits alimentaires - Détection d'aliments ioniséscontenant des lipides - Analyse par chromatographie enphase gazeuse des hydrocarburesLebensmittel - Nachweis von bestrahlten fetthaltigenLebensmitteln - Gaschromatographische Untersuchung aufKohlenwasserstoffeThis European Standard was approved by CEN on 20 June 2003.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and UnitedKingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2003 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1784:2003 ESIST EN 1784:2003

Tables.13Annex B (informative)
Figures.14Bibliography.20SIST EN 1784:2003

and ß positions with respect to the carbonyl groups resulting in therespective Cn-11) and the Cn-2:12) HC. To predict these chief radiolytic products, the fatty acid composition ofsamples has to be known (see tables A.1 and A.2).
1)Cn-1: HC which has one carbon atom less than the parent fatty acid.SIST EN 1784:2003

2)Cn-2:1: HC which has two carbon atoms less than the parent fatty acid and an additional double bond in position 1.3)Florisil® is an example of a suitable product available commercially. This information is given for the convenience of users ofthis standard and does not constitute an endorsement by CEN of this product.SIST EN 1784:2003

4)n-Hexane was the solvent used to validate the method. However, it is also possible to use n-pentane on health groundsprovided it can be shown to lead to the same results.5)The National Standardization Organizations inform on the availability of 1,7-16:2 and 8-17:1SIST EN 1784:2003

or in fat-free metal foil. Foils having a wax coating or packing materials made ofpolyethylene should not be used.7 Procedure7.1 Reagent blankPrepare a reagent blank for every analysis series.The impurities which are encountered are mainly saturated HC, which have been detected in particular in Florisil®,solvent, filter paper and extraction thimbles (for Soxhlet extraction). To remove impurities, wash filter paper andextraction thimbles of cellulose with solvent until no impurities can be detected. Solvent blank solutions should beconcentrated before analysing them for contamination. Plastics materials should not be used for the analyses. Onlythoroughly clean glassware should be used.SIST EN 1784:2003
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