Textbook Question
Which of the following is most likely to be bactericidal?
a. Membrane filtration
b. Ionizing radiation
c. Lyophilization (freeze-drying)
d. Deep-freezing
e. All of the above
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11. Controlling Microbial Growth
Physical Methods to Control Microbial Growth
2:19 minutesProblem 1
Textbook Question
Foods packed in plastic for microwaving are
a. Dehydrated.
b. Freeze-dried.
c. Packaged aseptically.
d. Commercially sterilized.
e. Autoclaved.
Verified step by step guidance1
Step 1: Understand the context of the question, which is about the method used to prepare foods packed in plastic for microwaving.
Step 2: Review the definitions of each option: (a) dehydrated foods have water removed, (b) freeze-dried foods are dried by freezing and sublimation, (c) aseptic packaging involves sterilizing the food and packaging separately in a sterile environment, (d) commercially sterilized foods are treated to destroy pathogens and spoilage organisms but not necessarily sterile, and (e) autoclaving is a high-pressure steam sterilization process typically used for lab media or canned foods.
Step 3: Consider that microwavable plastic-packed foods are usually processed to be safe and shelf-stable without refrigeration, often using aseptic packaging to maintain sterility without heat damage.
Step 4: Eliminate options that do not fit the typical microwavable plastic packaging process, such as autoclaving (which is not used for plastic microwavable packaging) and freeze-drying (which is a drying process, not packaging).
Step 5: Conclude that the correct process for foods packed in plastic for microwaving is most consistent with aseptic packaging, where the food and packaging are sterilized separately and combined in a sterile environment.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Commercial Sterilization
Commercial sterilization is a heat treatment process that destroys all pathogenic microorganisms and reduces spoilage microbes to safe levels, ensuring food safety and extended shelf life without compromising quality. It is commonly used for packaged foods, including those in plastic containers designed for microwaving.
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Aseptic Packaging
Aseptic packaging involves sterilizing the food and the packaging separately before filling in a sterile environment, preventing contamination. This method is used for shelf-stable foods but differs from commercial sterilization, which typically involves sterilizing the food within its sealed container.
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Freeze-Drying and Dehydration
Freeze-drying and dehydration are drying methods that remove moisture to preserve food. Freeze-drying freezes the food and removes water by sublimation, while dehydration uses heat to evaporate water. These methods are not typically associated with foods packed in plastic for microwaving.
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