explain refrigeration of food-suff.
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Answer:
Here is a answer in detail.
Explanation:
- Refrigeration for Food Preservation
- Fruits and vegetables are perishable commodities. If not stored at recommended temperatures,
- they rot in a short time by chemical reactions, bacterial attack, or water loss. Improperly stored
- fruits and vegetables lose nutrition value over a period of time. Changed physical appearance or
- taste also affects their consumer appeal. Refrigeration helps in preserving fruits and vegetables by
- storing at low temperatures to slow down decay and natural metabolic processes.
- Meat, fish products and precooked foods also have limited life because of enzyme activities, bacteria
- attack and ageing. Low temperature is very effective in limiting these reactions. Similarly, ice cream,
- other dairy products, bakery products and beverages need to be stored at low temperatures for
- long term use.
- Q. How does refrigeration help to conserve food products?
- Food products get spoiled because of internal chemical reactions which cause ripening and
- fermentation; and the growth of mould and bacteria. These processes can be stopped or slowed
- down by storing the food at low temperatures. Thus, refrigeration techniques help to preserve food
- products for longer periods.
- Q. Can all fruits and vegetables be stored at the same temperature?
- No. The optimum storage temperature varies for different kinds of food products. Fruits like grapes,
- kiwifruit, apple, cherry, peach, strawberry, raspberry and vegetables like onion, cabbage, beet,
- carrots, etc. are ideally stored at temperatures of around 0˚C. Oranges and potatoes are stored at 4
- to 5oC. Watermelon, pumpkin, grapefruit, and cucumber require 10˚C storage temperature. Mango,
- lemon, tomato, and banana are stored at 14 to 15˚C temperature.
- Q. What is the normal relative humidity required for the food storage?
- Normally most food products require 90 to 95 % relative humidity (RH) inside the cold storages.
- Onions require very low RH of 65 to 70%. Leafy vegetables are stored at more than 95% RH to
- avoid excessive moisture loss.
- Q. Why do frozen foods last longer than refrigerated foods?
- Fruits and vegetables are stored at temperatures slightly above freezing point to prolong their life
- by a few days or weeks. Here, product decay process is slowed down but not stopped completely.
- Whereas, meat, fish, precooked foods as well as fruits and vegetables may be frozen and stored at
- very low temperatures until they are defrosted and cooked by the consumer. In this case, the decay process is stopped completely and the food can be preserved.
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REFRIGERATION OF THE FOOD STUFF::::::
- When the food is kept in a refrigerator, the oxidation of fats and oils in it is slowed down due to low temperature, so the development of rancidity due to oxidation is retarded or held back.
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