Final answer:
The criteria for receiving UHT pasteurized and aseptically packaged food involve sterilizing the food by exposing it to ultra-high temperatures for a few seconds, which allows it to be stored for an extended period without refrigeration. UHT pasteurized milk can last up to 90 days in airtight containers.
Step-by-step explanation:
The criteria for receiving UHT (ultra-high-temperature) pasteurized and aseptically packaged food principally involve the application of high heat to the food product, such as milk, to sterilize it. UHT pasteurization exposes the product to temperatures near 140°C for just a few seconds. This process ensures that most microbes are killed, extending the shelf life of the product significantly. As a result, UHT pasteurized milk can be sealed in airtight containers and stored for up to 90 days without the need for refrigeration. Despite the high heat, which may slightly alter flavors and nutritional contents, this method is preferred in areas where refrigeration is not readily available. By comparison, high-temperature short-time (HTST) pasteurization heats milk to 72°C for 15 seconds. While also effective at reducing microbial presence, HTST pasteurization requires refrigeration to maintain the milk's quality over time. The choice between these methods depends on the intended storage conditions and the balance between extending shelf life and preserving the original taste and nutritional value of the milk.