Question

Describe the method of preserving foods by canning.

Explain the method of canning as an important method for preservation.

Answer 1

1. Canning uses the process of sterilisation.
2. It can be used with most foods, including fruits, vegetables, meats, seafood, and some prepared foods.
3. First, the food item is inspected, and all extraneous or undesirable materials are removed.
4. After blanching, the food is placed in the containers mechanically or by hand, depending on the nature of the product.
5. Then, the item is arranged in the can and covered with boiling syrup, juice, or water, up to 11/2 inches of the top.
6. Then, the air is removed from the jar so that its internal pressure, after it has been heated and cooled, becomes less than atmospheric pressure.
7. This process prevents discolouration and undesirable oxidation effects that may take place in the food product.
8. After exhausting the air and/or vapours, the filled cans are permanently sealed by mechanical processes.
9. The permanently sealed containers are subjected to temperatures designed to destroy microbiological organisms which are likely to be present on them.