The Pharmaceutics and Compounding Laboratory
Colloidal Dispersions

Learning Objectives

Upon completion of this exercise, you should be able to:

  • Define colloidal dispersions, Tyndall effect, and Brownian movement.
  • Differentiate between lyophilic and lyophobic colloids and identify examples of each.
  • Describe the microscopic and macroscopic properties of colloidal dispersions.
  • Identify protective colloids and describe their effect on the formulation and stability of lyophobic colloids.
  • Identify formulation ingredients which may contribute to colloid instability.
  • Describe how to stabilize a lyophobic colloid against metal ion induced co-precipitation.
  • Prepare a stable colloidal dispersion.