Question

3. A powdery substance or paste of food item is taken in a test tube and after that a few drops of copper sulphate solution and then caustic soda solution were added, on shaking the test tube, it was observed that the solution turned violet coloured after few minutes due to the presence of which component? *​

Answer 1

Given below are the steps to test the presence of proteins in

a food item:

(i) Take a small quantity of the food item in a test tube, add 10

drops of water to it and shake it.

(ii) Make a paste or powder of food to be tested.

(iii) Add 10 drops of caustic soda solution to the test tube and

shake well.

(iv) Add 2 drops of copper sulphate solution to it.

Explanation:

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