Question

Describe how protien is tested in food.​

Answer 1

Answer:

Test if a food item contains protein.

Take a small quantity of the food items to be tested.

Grind/mash/paste/powder the food item.

Put the food item into a test tube.

Add 10 drops of water and shake the test tube.

Using a dropper add two drops of copper sulphate solution to the test tube.

Add 10 drops of caustic soda solution and shake the test tube.

Observe the colour of the mixture.

Violet colour indicates the presence of proteins in the tested food item.

Answer 2

Answer: Take a small quantity of food item and either make a paste or powder of it.

Put some of it in a test tube, add 10 drops of water and shake the test tube.

Using a dropper add a two drops of copper sulphate solution and 10 drops of caustic soda solution to the test tube.

Shake the tube well and observe the change of colour of the food item.

Observation:

The sample of the food turns violet or purple in colour.