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Question

Name the lyophobic colloid present in the milk.


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Solution

Colloid:

  • A colloid is known as the mixture in which one substance that is made up of microscopically dispersed insoluble particles is suspended throughout another substance.
  • Colloids are mainly categorized into two types, depending on the nature of the interaction between the dispersion phase and the dispersed medium i.e lyophilic and lyophobic colloids.
  • Lyophilic colloid – It is defined as the colloid in which the dispersed phase has an affinity for the dispersion medium.
  • Lyophobic colloids –It is defined as the colloid in which the dispersed phase has little or no affinity for the dispersion medium.

The lyophobic colloid present in the milk:

  • The lyophobic colloid present in the milk is known as Casein.
  • Casein and whey protein are generally known as the major proteins of milk.
  • Casein constitutes approximately 80%(29.5g/L) of the total protein in milk, Whereas whey protein consist of about 20%(6.3g/L).
  • The nitrogen content of milk is distributed among Caseins (75%), whey proteins (18%), miscellaneous proteins (2%) and non-protein nitrogen (5%).

Hence, the name of the lyophobic colloid present in the milk is Casein.


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