Eggshell membrane

An article about the eggshell membrane, its structure, and functions.

Eggshell Membrane

The eggshell membrane is a thin layer located between the eggshell and the egg white (albumen) in bird eggs. It plays a crucial role in protecting the egg from bacterial invasion and physical damage while allowing the exchange of gases necessary for the developing embryo.

Eggshell membrane visible after removing the shell.

Structure

The eggshell membrane is composed primarily of fibrous proteins such as collagen and contains various glycoproteins. It consists of two distinct layers:

• Inner Membrane: This layer is in direct contact with the egg white and is thinner than the outer membrane.
• Outer Membrane: This layer is adjacent to the eggshell and is thicker, providing additional protection.

The membranes are semi-permeable, allowing the passage of gases like oxygen and carbon dioxide, which are essential for the respiration of the developing embryo.

Function

The primary functions of the eggshell membrane include:

• Protection: It acts as a barrier against bacterial invasion and physical damage.
• Gas Exchange: The semi-permeable nature of the membrane facilitates the exchange of gases, which is vital for the embryo's development.
• Moisture Retention: It helps in retaining moisture within the egg, preventing desiccation of the embryo.

Applications

In recent years, the eggshell membrane has gained attention for its potential applications in various fields:

• Nutraceuticals: It is used in dietary supplements for joint health due to its collagen content.
• Cosmetics: The membrane's proteins and peptides are utilized in skincare products for their purported anti-aging properties.
• Biomedical: Research is ongoing into its use in wound healing and tissue engineering.

Related Pages

• Eggshell
• Egg white
• Collagen
• Bird egg