Emulsifying agent

Definition

An emulsifying agent is a substance that stabilizes an emulsion by increasing its kinetic stability. It allows the mixing of two immiscible liquids, such as oil and water.

5 Must Know Facts For Your Next Test

1. Emulsifying agents possess both hydrophilic (water-attracting) and hydrophobic (water-repelling) properties.
2. Common emulsifying agents include lecithin, egg yolk, and soap.
3. They work by reducing the surface tension between the two immiscible liquids.
4. In food chemistry, emulsifiers are crucial for products like mayonnaise and salad dressings.
5. Emulsions stabilized by emulsifying agents can be found in pharmaceuticals, cosmetics, and cleaning products.

Review Questions

• What dual properties do emulsifying agents possess that allow them to stabilize emulsions?
• Name three common substances that act as emulsifying agents.
• How do emulsifying agents reduce surface tension between immiscible liquids?

Related terms

Emulsion: A mixture of two immiscible liquids where one liquid contains a dispersion of the other.

Hydrophilic: Having an affinity for water; typically dissolves or mixes well with water.

Hydrophobic: Tending to repel or fail to mix with water.