Chapter 13 of 42
Revision Notes
Food Preservation — Revision Notes
Telangana Open School (TOSS) · Class 12 · Community Science (Home Science)
Food Preservation revision notes for Telangana Open School (TOSS) Class 12 Community Science: 4 topics in quick points.
45 questions30 flashcards4 concepts
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Key Topics to Revise
1
Physical Methods of Food Preservation
- Pasteurization involves heating food below 100°C to kill harmful microbes while retaining nutritional and sensory qualities.
- High-Temperature Short-Time (HTST) pasteurization: 71.5°C for 15 seconds (used for milk).
- Ultra-High Temperature (UHT) pasteurization: 135°C for 1–2 seconds, giving longer shelf life (up to 3 months under refrigeration).
2
Chemical Methods of Food Preservation
- Chemical preservatives inhibit microbial growth by altering the internal environment of food.
- Common preservatives include salt, sugar, vinegar, benzoates, sorbates, sulfites, and nitrites.
- Salt and sugar work by creating hypertonic conditions, causing microbial cells to lose water (osmosis).
3
Biological Methods of Food Preservation
- Fermentation uses beneficial microorganisms like bacteria and yeast to convert sugars into acids, alcohol, or gases.
- Lactic acid bacteria produce lactic acid, lowering pH and preventing pathogen growth.
- Alcoholic fermentation by yeast converts sugars into ethanol and CO₂ (used in wine and beer).
4
Emerging Techniques and Hurdle Technology
- Hurdle technology combines two or more preservation methods to enhance effectiveness.
- Each 'hurdle' (e.g., low pH, salt, refrigeration) acts together to stop microbial growth synergistically.
- Modified Atmosphere Packaging (MAP) alters gas composition (like increasing CO₂) to extend shelf life.
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Full NotesKey Concepts
These involve using heatIn this methodThis method uses beneficial microorganisms likeIt combines two or more preservation
Frequently Asked Questions
What are the important topics in Food Preservation for Telangana Open School (TOSS) Class 12 Community Science (Home Science)?
Key topics in Food Preservation include Physical Methods of Food Preservation, Chemical Methods of Food Preservation, Biological Methods of Food Preservation, Emerging Techniques and Hurdle Technology. Study these first, then practise questions on each for the Telangana Open School (TOSS) Class 12 board exam.
How should I revise Food Preservation for the Telangana Open School (TOSS) Class 12 board exam?
Learn the core ideas first, then work through the 45 practice questions on Food Preservation. Revise definitions regularly and use flashcards for quick recall before the exam.
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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