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Título

Intercomparison of methods for the determination of trans fatty acids in edible oils and fats and certification of three materials containing trans fatty acids

Otros títulosReport on the First Intercomparison
AutorUlberth, F.; Buchgraber, M.; Boenke, A.; Alonso López, Leocadio ; Juárez, Manuela ; Fontecha, F. Javier
Fecha de publicación1999
EditorEuropean Commission
CitaciónIntercomparison of methods for the determination of trans fatty acids in edible oils and fats and certification of three materials containing trans fatty acids (1999)
BCR information series
EUR 18955 EN
ResumenThe aim of the first intercomparison was twofold. Firstly, to select, stabilise and bottle suitable materials containing ca. 1 %, 5 % and 30 % total trans fatty acids (TFA) and demonstrate that packaging and storage does not affect oil composition, and secondly, to demonstrate that participating laboratories are able to achieve sufficient conformity of test results. Stabilising oil samples with tert. butylhydroquinone (250 mg/kg) and packaging in inert atmosphere in amber glass ampoules resulted in homogeneous and stable lots of preliminary test materials. Analytical precision of chromatographic methods to determine trans fatty acids (TFA) was acceptable (RSD(R) < 15 %) for analyte levels > 1 g/100 g, but for levels < 1 g/100 g precision was beyond the agreed acceptance criterion (RSD(R) > 40 %). Misidentification of peaks and inconsistent peak integration practices are considered to be the major reasons for deviating results reported by the participants. Results obtained by chromatographic methods were in close agreement with those produced by spectroscopy (IR and NMR), thus proving that the applied chromatographic methods were not systematically biased. The intercomparison has to be repeated with new sets of samples. Special emphasis will be placed on the correct identification of trans polyenes in order to improve precision for low levels of TFA. To facilitate correct identification, the Co-ordinator will distribute equivalent chain length data for TFA.
DescripciónUlberth, F. et al.
URIhttp://hdl.handle.net/10261/114150
Identificadoresisbn: 92-828-2248-6
issn: 1018-5593
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