Beef steaks from six Spanish cattle breeds (Asturiana de los Valles, Morucha, Parda Alpina, Pirenaica, Rubia Gallega and
Retinta) were packaged under modi®ed atmosphere (60% O
2
, 30% CO
2
and 10% N
). Water loss, pH, thiobarbituric acid values
(TBA), aerobic plate counts, lactic acid bacteria and Enterobacteriaceae counts, CIE L*a*b* colour values and the sensory properties
of odour and colour were recorded before packaging (day 0) and after 5, 10 and 15 days of storage. A signi®cant interaction
(P<0.05) between breed and storage time was found for all variables, except water loss. Values of pH were between 5.3 and 5.6;
maximum water loss (2.64%) was reached after 10 days of storage; aerobic plate counts, lactic acid bacteria and Enterobacteriacea
counts were lower than 10
7
2
CFU/g, and L* increased with storage time while a* decreased (P<0.05). The maximum shelf life of
beef assessed by sensory evaluation (regarding colour and odour degradation) was between days 5 and 10 in meat from Retinta
breed and between days 10 and 15 in meat from the other breeds, shelf life was probably limited by lipid oxidation.
การแปล กรุณารอสักครู่..