Question

what happens when food materials containing fats and oils are left for a long time? List to observable changes and suggest three ways by which this phenomena can be prevented .​

Answer 1

The food will get rancid. Two observable changes:

1) bad smell from the food

2) bad taste of the food

Three ways:

1) By flushing food with nitrogen.

2) By adding antioxidants in the food.

3) Keep the food away from sunlight

Answer 2

When food materials containing fat and oil are left for a long time date on rancid.

Explanation:

• this is because of the growth of microorganisms on the surface of lipid. It consist of higher amount of energy and hence it is an ideal medium for the growth of microorganism.

• The observable changes are

1. the change in the smell of the food product.
2. The change in the visual appearance and colour of the food.
3. The the change in the the taste of the oil or fat product.

• Usually fat or lipid  should always be kept in the cold refrigerator.

• There should be large amount of antioxidant and preservatives which should be added so as to prevent the destruction of the food product.

• spraying the food with nitrogen and also kill the microorganism.

To know more about destruction of fat by microorganism,

Which harmful bacteria in the intestine is destroyed due to probiotics ..

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