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Questions and Answers
What is the recommended temperature for good frozen storage?
At what humidity percentage should leafy vegetables be stored?
What is the term for the mass required to raise the temperature by 1 degree Celsius?
What happens to enzyme activity at low temperatures?
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Which of the following factors is NOT a requirement for refrigeration?
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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!