Microbiological Safety of Radappertized Beef ¹

Area of Science:

• Food Science
• Microbiology
• Radiation Processing

Background:

• Microbiological safety and stability are critical for irradiated meats.
• Inoculated pack studies are essential for validating radiation doses.
• Clostridium botulinum spore reduction is a key safety metric.

Purpose of the Study:

• To determine the radiation dose required for a 12-log reduction of Clostridium botulinum spores in beef.
• To ensure microbiological safety and stability of packaged meats.
• To validate the efficacy of combined thermal and radiation treatments.

Main Methods:

• Inoculated pack studies using a specific strain of Clostridium botulinum.
• Application of the binomial confidence limit method for dose computation.
• Utilizing partial spoilage data to calculate the required 12D dose.

Main Results:

• A beef inoculated pack study identified a significant partial spoilage point at 22 kGy.
• The computed 12D dose for Clostridium botulinum inactivation was 41.2 kGy.
• Combined thermal and radiation treatment demonstrated a wide margin of safety.

Conclusions:

• The determined 41.2 kGy dose ensures microbiological safety and stability for irradiated beef.
• Preceding thermal treatment effectively inactivates autolytic enzymes.
• The study validates a robust method for assuring the safety of shelf-stable irradiated meats.