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Components of Food > Ask Question to Alfie
Video showing Test for Presence of Protein in Food
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When two drops of copper sulphate and ten drops of caustic soda or NaOH is added to egg, it turns violet. This indicates the presence of proteins.This is Biuret's test and the principle is simple as follows:
In the presence of alkaline medium (caustic soda or NaOH), the Cu2+ ions get reduced to Cu+ and binds to the egg proteins, thereby giving a violet color.
Therefore, the correct answer is option B.Didn't understand the solution?
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When copper sulphate and caustic soda are added to a food sample, a violet color indicates the presence of proteins in the food.
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