CBSE - VI

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Test For Starch, Proteins and Fats

Test For Starch, Proteins and Fats

Different food items contain different types of nutrients

To view the complete lesson click the video below

  • Different food items contain different types of nutrients.
  • Nutrients are chemical components in food that are required for releasing energy and helps in growth.
  • Carbohydrates, proteins, fats, vitamins and minerals are important nutrients found in food.
  • Carbohydrates and fats mainly provide energy.
  • Proteins mainly help in growth.
  • Starch and sugar are the two kinds of carbohydrates found in food.

To test the presence of starch in a food item, you need to:

  • Take small quantity of the food items to be tested.
  • Put 2-3 drops of iodine solution on it.
  • Observe the colour of the food item.
  • Blue-black colour indicates the presence of starch in the tested food item.

To test for the presence of proteins in a food items, you need to:

  • 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 to the test tube.
  • 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.

To test for the presence of fats in a food item, you need to:

  • Take a small quantity of the food item to be tested.
  • Wrap the food item in a small piece of paper.
  • Crush the food item wrapped in the paper.
  • Straighten the paper.
  • Dry the paper by keeping it in sunlight for a while.
  • Observe the paper.
  • An oily patch on the paper indicates the presence of fats in the tested food item.

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