TEST FOR NUTRITIONS
Benedict’s Test For Reducing Sugar:
1) To 2cm3 of glucose solution in a test-tube add 2cm3 of Benedict’s solution.
2) Shake the mixture and heat it by immersing the test-tube in a beaker of
boiling water for 5 minutes.
3) After 5 minutes, if reducing sugar is present the colour will change from
blue to green, yellow, orange or red depending on how much reducing
sugar is present in the solution.
Test For Fats:
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Take a dry test-tube.
Add 2cm3 of ethanol to a drop of coconut oil in a test tube.
Shake the mixture thoroughly.
Add 2cm3 of water to the mixture.
A cloudy white emulsion forms which indicates the presence of fat.
Test For Proteins:
1) To 2cm3 of egg white solution in a test-tube add 2cm3 of Biuret solution and
shake thoroughly.
2) The solution will become blue in colour.
3) After shaking, keep it steady for 5 minutes.
4) The colour will change from blue to violet which indicates the presence of
protein.
Test For Starch:
1) Take a piece of potato and add a few drops of iodine solution.
2) It forms a blue black colour which indicates the presence of iodine.