What are some examples of stabilizers for emulsions?

• A. Sorbitan Esters
• B. Sodium Chloride
• C. Acacia
• D. High-Molecular Weight Alcohol, Colloidal Clays

Answer: (D)

Stability in emulsions comes from stabilizers that thicken or gel the continuous phase, forming a network that slows droplet movement and prevents coalescence. Emulsifiers reduce interfacial tension to create droplets, but stabilizers keep those droplets from merging once formed.

High-molecular-weight alcohols, such as cetyl or stearyl alcohol, act as stabilizers by thickening the formulation and creating a soft, structured matrix. This increased viscosity helps resist droplet drainage and coalescence. Colloidal clays, like bentonite, form a gel-like network in the aqueous phase that traps droplets and provides a physical barrier against separation. Together, these types of stabilizers are classic examples of how to enhance emulsion stability.

Sorbitan esters are primarily emulsifiers that reduce interfacial tension. Sodium chloride mainly affects tonicity and does not stabilize the emulsion integrity. Acacia can function as a thickener or mild emulsifier, but the combination of a thickening/high–molecular-weight agent with a colloidal clay best illustrates stabilizers that reinforce the emulsion’s structure.