Question

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Answer 1

Answer:

The iodine test for starch uses iodine to detect the presence of starch in a food. Iodine is a yellow-brown element that is present in betadine.

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Answer 2

Test of carbohydrate :-

Theory:
The presence of carbohydrates, fats and proteins in any food stuff is detected by performing the tests for proteins, fats and carbohydrates with the extract of the foodstuff. The advantage is these tests do not interfere with each other.

Test for Carbohydrates:
Molisch’s test – Given sample food + Molisch’s reagent → Purple or violet ring confirms the presence of carbohydrate.
Fehling’s test – Given sample food + Fehling’s reagent → Red precipitate confirms the presence of carbohydrates
Benedict’s test – Given sample food + Benedict’s reagent → Red precipitate confirms the presence of carbohydrates.
Tollen’s test – Given sample food + Tollen’s reagent → Silver mirror confirms the presence of carbohydrates.
Iodine test – Given sample food + Iodine solution → Blue colour solution confirms the presence of starch.


Test of 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 presence of starch in the tested food item.

Test of 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.