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Fate of salmonella infantis staphylococcus aureus and hafnia alvei in vacuum packaged beef plate pieces during refrigerated storage

, : Fate of salmonella infantis staphylococcus aureus and hafnia alvei in vacuum packaged beef plate pieces during refrigerated storage. Journal of Food Science 45(5): 1273-1277, 1300

The fate of S. infantis, S. aureus and H. alvei inoculated onto vacuum packaged and polyvinylchloride (PVC) packaged fresh beef plate pieces after 0, 3, 7, 14, 21 and 28 days of storage at C was investigated. Aerobic plate counts (APC) of representative beef pieces were also monitored during storage and the effect of heat shrinking on both inocula and APC in vacuum packaged samples determined. APC of vacuum packaged beef pieces increased slower and attained lower final numbers than did PVC wrapped pieces. Levels of S. infantis in PVC and vacuum packaged samples declined at similar rates during 28 days of storage with overall decreases of 52 and 55%, respectively. The most rapid decreases occurred during the 1st wk of storage. S. aureus levels in PVC and vacuum packaged samples declined at similar rates during 28 days of storage with overall decreases of 90 and 80%, respectively. H. alvei increased in numbers by approximately 4.45 and 4.60 log cycles/g in vacuum and PVC packaged beef pieces, respectively, during 28 days of storage. Levels of inocula in vacuum packaged samples were significantly lower initially and during storage than respective inocula in PVC packaged samples. Heat shrinkage of vacuum packages had no significant effect on levels of inocula or subsequent APC.


DOI: 10.1111/j.1365-2621.1980.tb06536.x

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