Lyophilization in food preservation is by ________.
a. Cell lysis
b. Gamma radiation
c. Rapid heating
d. Freeze-drying

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Understand the term 'lyophilization': it is a process used in food preservation that involves removing water from a product after it is frozen, by sublimation (transition of water from solid to gas phase without passing through liquid).

Recall that lyophilization is commonly known as freeze-drying, which helps preserve food by preventing microbial growth and enzymatic activity that require water.

Evaluate each option: (a) cell lysis refers to breaking down cells, not a preservation method; (b) gamma radiation is a sterilization method using ionizing radiation; (c) rapid heating is a method that can kill microbes but is not lyophilization; (d) freeze-drying matches the definition of lyophilization.

Conclude that lyophilization in food preservation is achieved by freeze-drying, which removes moisture while maintaining the structure and nutrients of the food.

Therefore, the correct answer corresponds to option (d) freeze-drying.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Lyophilization

Lyophilization, or freeze-drying, is a dehydration process used to preserve perishable materials by freezing them and then reducing the surrounding pressure to allow frozen water to sublimate directly from solid to gas. This method helps maintain the structure and nutritional content of food.

Food Preservation Methods

Food preservation techniques aim to prevent spoilage by inhibiting microbial growth or enzymatic activity. Common methods include drying, freezing, radiation, and chemical treatments, each working through different mechanisms like moisture removal or microbial inactivation.

Mechanisms of Microbial Inactivation

Microbial inactivation can occur through various mechanisms such as cell lysis, heat denaturation, or radiation damage. Understanding these helps differentiate preservation methods like gamma radiation, which kills microbes, from lyophilization, which primarily removes water to inhibit growth.

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