The response of Salmonella enteriditis was examined on exposure to a combination treatment of potassium sorbate and modified atmosphere at 10 C. Atmospheres employed were 100, 60 and 20% CO2; vacuum and an air control. The organisms were exposed to these atmospheres on tryptic soy agar containing 0.0, 0.5, 1.5 or 2.5% potassium sorbate at pH 6.5, 6.0 or 5.5. In the absence of sorbate, only the 100% CO2 atmosphere inhibited growth; the vacuum and 20 and 60% CO2 atmospheres were in fact stimulatory. In combination with sorbate, all atmospheres were inhibitory. The combination treatment was increasingly effective with decreasing pH and increasing CO2 and sorbate concentrations.

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Author notes

1Present address: The Agricultural University of Norway, 1432 As-NLH, Norway.