Question

Name the lyophobic colloid present in the milk.

Answer 1

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 $80\%(29.5\mathrm{g}/\mathrm{L})$ of the total protein in milk, Whereas whey protein consist of about $20\%(6.3\mathrm{g}/\mathrm{L}).$
• 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.