The evaluation of the purity of cow milk fat is currently performed by the official EU method, that is based on the gas chromatographic (GC) analysis of triglycerides according to their total number of carbon atoms and the application of formulae deriving from multiple linear regressions. The high-speed GC is one of the recent innovations in the das chromatographic analysis. In this work the GC analysis with ultrafast module and PTV injection system was tested for the evaluation of milk fat purity. The most suitable analytical conditions were set up and then the reference material CRM-519 was analysed for the calibration. Afterwards, two mixtures of cow milk fat with two levels of beef tallow and lard were analysed by both the UFM-GC and the conventional gc technique in use in the laboratory. Lastly, samples of water buffalo, goat and sheep milk fat were analysed as well. UFM-GC technique showed to be a valid and suitable method for the evaluation of cow milk fat purity, meeting the requirements of gas chromatographic separation and repeatability reported in the official method. Moreover, the reproducibility values obtained from the conventional analysis and UFM-GC were always below the limits reported by the law. Finally, the investigation on the milk fats of different species proved the inapplicability of the bovine milk fat s ranges for the evaluation of purity of non bovine milk fat.
|Titolo:||Efficacia della tecnica Ultrafast GC nella valutazione della genuinità del grasso di latte|
PELIZZOLA, VALERIA (Secondo)
|Settore Scientifico Disciplinare:||Settore AGR/15 - Scienze e Tecnologie Alimentari|
|Data di pubblicazione:||2007|
|Appare nelle tipologie:||01 - Articolo su periodico|