Which method of physical microbial control can be used to sterilize fresh food?

Which method of physical microbial control can be used to sterilize fresh food?

• A. Pasteurization
• B. Radiation
• C. Boiling
• D. Filtration

Answer: (B)

Radiation is an effective method of physical microbial control that can be used to sterilize fresh food. This technique often employs ionizing radiation, such as gamma rays, which can penetrate deeply into food and effectively kill microbes, including bacteria, molds, and parasites. This process helps in extending the shelf life of fresh food by reducing the microbial load, minimizing spoilage, and ensuring food safety without the need for high temperatures that might affect food quality.

While pasteurization is used to heat treat liquid foods to kill pathogens and reduce spoilage organisms, it may not be suitable for all types of fresh foods and does not typically achieve complete sterilization. Boiling is an effective method for killing many microorganisms but may not reach the high level of sterilization required for fresh food without compromising its quality. Filtration can remove microorganisms from liquids and air but is not typically used for solid foods. Therefore, radiation stands out as the method that not only sterilizes but does so effectively for various types of fresh food.