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Salmonella Sensitivity in a Sorbate/Modified Atmosphere Combination System.

Philip H Elliott1, Rodney J H Gray1

  • 1Department of Food Science and Human Nutrition, University of Delaware, Newark, Delaware 19711.

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|March 13, 2019
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Combining potassium sorbate with modified atmospheres effectively inhibits Salmonella Enteritidis growth. This food preservation strategy is enhanced by lower pH, higher CO2, and increased sorbate levels.

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Area of Science:

  • Food Microbiology
  • Food Safety
  • Microbial Physiology

Background:

  • Salmonella Enteritidis is a significant foodborne pathogen.
  • Effective control strategies are crucial for public health.
  • Combined preservation methods can offer synergistic effects.

Purpose of the Study:

  • To evaluate the efficacy of combined potassium sorbate and modified atmosphere treatments against Salmonella Enteritidis.
  • To determine the influence of carbon dioxide (CO2) concentration, potassium sorbate levels, and pH on treatment effectiveness.

Main Methods:

  • Salmonella Enteritidis cultures were exposed to various modified atmospheres (100%, 60%, 20% CO2, vacuum, air control) at 10°C.
  • Tryptic soy agar supplemented with varying potassium sorbate concentrations (0.0% to 2.5%) and pH levels (6.5, 6.0, 5.5) was used.
  • Bacterial growth inhibition was assessed under different treatment combinations.

Main Results:

  • In the absence of potassium sorbate, only 100% CO2 inhibited growth; other atmospheres, including vacuum, were stimulatory.
  • The combination of potassium sorbate and modified atmospheres resulted in inhibition across all tested atmospheres.
  • Treatment efficacy increased with decreasing pH, increasing CO2 concentration, and higher potassium sorbate levels.

Conclusions:

  • Combined potassium sorbate and modified atmosphere treatments provide a robust method for controlling Salmonella Enteritidis.
  • Optimizing CO2 levels, sorbate concentration, and pH is key to maximizing the inhibitory effect.
  • This approach holds promise for enhancing food safety and extending shelf life.