Question

, describe one test each for detecting the presence of the following food protein stretch fat

Answer 1

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⠀⠀⠀⠀⠀⠀⠀Answer

protein:-

• 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 and shake the test tube.
• Using a dropper 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

starch:-

• 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 presences of starch in the tested food items

fats:-

• Take a small quantity of the food item to be tested.
• Wrap the food item in a piece of paper and crush it.
• 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

hope it will help you

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