FDSC 241 Lecture #5 Study Guide
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Questions and Answers

What is the recommended temperature for good frozen storage?

  • 32°F
  • 10°F
  • 0°F (correct)
  • 28°F
  • At what humidity percentage should leafy vegetables be stored?

  • 95% (correct)
  • 70%
  • 90%
  • 80%
  • What is the term for the mass required to raise the temperature by 1 degree Celsius?

  • Specific heat (correct)
  • Heat index
  • Thermal conductivity
  • Thermal capacity
  • What happens to enzyme activity at low temperatures?

    <p>It is inhibited</p> Signup and view all the answers

    Which of the following factors is NOT a requirement for refrigeration?

    <p>High humidity</p> Signup and view all the answers

    Study Notes

    Refrigeration Basics

    • Refrigerators for food storage operate at temperatures between 40-45°F, suitable for both home and commercial use.
    • Pure water freezes at 32°F, providing a standard reference for temperature.
    • Most foods typically freeze around 28°F.

    Freezing and Storage

    • Optimal frozen storage temperature is 0°F to ensure food safety and quality.
    • Freezing is recognized as the gentlest preservation method, maintaining food texture and nutrients.
    • Spoilage and pathogenic bacteria can slowly proliferate in refrigeration conditions, emphasizing the importance of correct temperature control.

    Refrigeration Requirements

    • Controlled low temperature is crucial for effective refrigeration.
    • Proper air circulation is necessary to avoid hot spots and ensure even cooling.
    • Humidity control is fundamental; excessive humidity leads to condensation, potentially resulting in mold growth.
    • Insufficient humidity can cause food items to dry out, compromising freshness.

    Key Terms and Measurements

    • Specific heat is defined as the mass required to raise the temperature of a substance by 1 degree Celsius, with water having a specific heat of 4.186.
    • Respiration rates in food decrease as temperature drops, which can prolong freshness.
    • Low temperatures inhibit enzyme activity, which helps to slow spoilage and maintain quality.

    Cost and Storage Insights

    • Choosing lower storage temperatures can increase operational costs.
    • The coldest area in a household refrigerator is typically the bottom drawer, which is ideal for storing perishable items.
    • Refrigeration allows for year-round availability of specific foods and stabilizes prices throughout the year.

    Humidity and Food Storage

    • Air is essential for moving moisture away from food, contributing to better preservation.
    • Optimum relative humidity refers to established values for specific foods based on their moisture content.
    • Leafy vegetables require a relative humidity of 95%, while nuts require around 70%.
    • Common dry goods like powdered milk, sugar, and spices typically need around 60% RH for optimal preservation.

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    Description

    Prepare for FDSC 241 with this study guide covering key concepts from Lecture #5. Dive into essential refrigeration temperatures, food preservation methods, and the growth of bacteria in storage. Test your knowledge on these critical food science topics!

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