Textbook Question
Lyophilization can be described as:
a. Freeze-drying
b. Deep-freezing
c. Refrigeration
d. Pickling
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11. Controlling Microbial Growth
Physical Methods to Control Microbial Growth
2:09 minutesProblem 9
Textbook Question
The preservation of beef jerky from microbial growth relies on which method of microbial control?
a. Filtration
b. Lyophilization
c. Desiccation
d. Radiation
Verified step by step guidance1
Understand the problem: The question asks which method of microbial control is used to preserve beef jerky by preventing microbial growth.
Recall the definitions of each method: Filtration removes microbes by physically filtering them out, lyophilization is freeze-drying to preserve materials, desiccation is drying to remove water, and radiation uses energy to kill microbes.
Consider the nature of beef jerky: It is a dried meat product where moisture is removed to inhibit microbial growth.
Match the preservation method to beef jerky: Since beef jerky is preserved by removing water to prevent microbial growth, the method involved is desiccation.
Conclude that the correct microbial control method for preserving beef jerky is desiccation, which inhibits microbial growth by reducing water availability.
Verified video answer for a similar problem:This video solution was recommended by our tutors as helpful for the problem above
Video duration:
2mKey Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Desiccation
Desiccation is the process of removing moisture from a substance, which inhibits microbial growth because most microbes require water to survive and reproduce. In food preservation, drying methods like those used in beef jerky reduce water activity, effectively preventing spoilage and pathogen proliferation.
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Desiccation
Microbial Growth Requirements
Microorganisms need certain conditions to grow, including moisture, nutrients, and suitable temperature. By altering these factors, such as reducing water availability through drying, microbial growth can be controlled or stopped, which is essential in food preservation techniques.
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Methods of Microbial Control
Microbial control methods include physical and chemical techniques like filtration, lyophilization (freeze-drying), desiccation, and radiation. Each method targets microbes differently; understanding these helps identify which is appropriate for preserving specific foods like beef jerky.
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03:59Selecting a Method to Control Microbial Growth
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