Question

How can we test the presence of protein in a food item

Answer 1

Answer:

Protein - Biuret solution

Biuret solution is used to identify the presence of protein. Biuret reagent is a blue solution that, when it reacts with protein, will change color to pink-purple.

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Answer 2

Answer:

The steps are:

•Make a paste or powder of the food item to be tested.

•Put the paste in a test tube.

•Add 10 drops of water to it and shake the test tube.

•Add 2 drops of solution of copper sulphate and 10 drops of solution of sodium hydroxide  to the test tube.

•A violet color indicates presence of proteins in the food item.

Explanation:

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