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(b) Describe how a student could test cow's milk to show whether it contains protein
different types of carbohydrate.

Respuesta :

Milk contains a lot of proteins in them it contains calcium protein potassium iodine. Phosphorus. It also contains vitamins b1 and b12.
ajinems

To show that cow milk contains protein and different types of carbohydrate,food tests should be carried out by the student.

Carbohydrates (sugars) are the main sources of food through which the body derives energy from.

The various types of carbohydrate are the simple sugars, complex sugars and starch.

Proteins are the main body-building substances which are necessary for the maintenance of health.

The cow milk contains proteins and a type of carbohydrate called lactose which is an example of complex sugar.

To test for protein in milk, xanthoproteic reaction test should be carried out by the student. The procedure includes:

  • To the milk solution add a few drops of concentrated nitric acid
  • A white precipitate forms, which turns yellow on heating.
  • Cool the contents and add a few drops of ammonia solution.
  • The colour of the precipitate deepens to yellow indicating presence of protein in the cow milk.

To test for carbohydrate in milk, a test for complex sugar should be carried out by the student. The procedure includes:

  • Add milk solution and hydrochloric acid into a test tube.
  • Place the test tube inside a boiling water-bath.
  • The acid hydrolyses the complex sugar to simple sugars.
  • Fehling's test is then carried out on the simple sugars that are formed which are glucose and galactose.
  • An orange-red precipitate indicates a positive result.

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