Affiliation:
1. 1 Department of Commodity Science and Processing of Animal Raw Materials , University of Warmia and Mazury in Olsztyn , Oczapowskiego 5, 10-719 Olsztyn , Poland
Abstract
Abstract
The aim of this study was to analyze the fatty acid profile of intramuscular fat and the content of vitamin A, vitamin E and cholesterol in samples of the longissimus lumborum (LL) beef muscles and stored for 7, 14 and 21 days under modified atmospheres (MA): vacuum, 80% O2 + 20% CO2, 60% O2 + 30% CO2 + 10% N2, 40% CO2 + 60% N2, 30% CO2 + 70% Ar). The experimental factors, i.e., storage time (ST) and MA composition, had no significant effect on the proportions of individual saturated fatty acids (SFAs), but they significantly modified the proportions of individual unsaturated fatty acids (UFAs) and the fatty acid profile of intramuscular fat (IMF). The study demonstrated that in order to minimize the loss of total UFAs, samples of the LL muscle should be cold-stored in MA 40% CO2 + 60% N2 for up to 14 days; MA 30% CO2 + 70% Ar also effectively prevented the loss of total PUFAs and eicosapentaenoic acid (EPA). The losses of vitamins A and E were lowest when beef was packaged under oxygen-free MA, in particular MA 30% CO2 + 70% Ar. Prolonged storage (21 days) did not contribute to significant vitamin losses, but it induced a decrease in cholesterol concentration, which was lower in vacuum-packaged samples than in those packaged in MA containing 60% O2 and MA composed of 40% CO2 + 60% N2.