Question

describe one test each for detecting the presence of the following in food:
(a) proteins
(b) starch
(c) fats​

Answer 1

(a)

• smash/crush/grind the food item to be tested.
• add this to 10ml of water in a tube.
• add this mixture with 2-3 drops of copper sulphate solution.
• also add 10 drops of caustic soda and shake it well.
• observe the color of the sample.
• Violet color indicates the presence of protein.

(b)

• Put few drops of iodine on the food.
• If the color changes to black/blue.
• Then the presence of starch is confirmed.

(c)

• Take a tissue paper.
• put the sample on the tissue.
• crush the sample under the tissue.
• observe the tissue.
• oil strains on the tissue mark the presence of fat in the sample.

Explanation:

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