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Preservation of food

Preservation of food. Food needs to be preserved... -So that surplus foods can be stored and then used in times of shortage. -So that we can enjoy seasonal fruits and vegetables all year round. -To enable it to be transported long distances without it decaying (and spillage!)

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Preservation of food

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  1. Preservation of food

  2. Food needs to be preserved... -So that surplus foods can be stored and then used in times of shortage. -So that we can enjoy seasonal fruits and vegetables all year round. -To enable it to be transported long distances without it decaying (and spillage!) -To allow it to be stored in the home for long periods without going off.

  3. 6 main methods of preservation • High temperature • Low temperature • Removing moisture • Use of chemicals • Controlling the atmosphere • Irradiation

  4. 1. High temperatures Canning Bottling Pasteurisation Ultra Heat Treatment (UHT) Sterilisation

  5. 2. Low temperatures Freezing Chilling

  6. Removing moisture Drying Accelerated Freeze Drying (AFD)

  7. 4. Use of chemicals Pickling Salting Smoking Sugar

  8. 5. Controlling the atmosphere Vacuum packing Modified atmosphere packaging (MAP)

  9. 6. Irradiation Task: Sort the following types of preservation with the meaning. Stick on page.

  10. Question 1 • Which food poisoning is commonly associated to ‘canning’? Clostridium botulinum.

  11. Question 2 • What are the three methods of preserving milk? Pasteurisation Ultra Heat Treatment (UHT) Sterilisation

  12. Question 3 • How does freezing preserve food? Stops bacteria and enzyme activity

  13. Question 4 • Name 3 foods which can be dried. Soups Pasta Beans Tomatoes Coffee

  14. Question 5 • Whilst sugar helps preserve fruit what are the disadvantages? High temp in making jam kills vitamin C

  15. Question 6 • What does MAP stand for? Modified Air Packaging

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