When you boil egg white (albumin is protein) you have?

When you boil egg white (albumin is protein) you have?


When you boil egg white, which is primarily composed of the protein albumin, several changes occur. The process of boiling denatures the proteins, causing them to unfold and form new structures. This article will explore the effects of boiling on egg white, including changes in texture, color, and nutritional value.

Denaturation of Proteins

Denaturation: Denaturation is a process in which proteins lose their native structure and functionality due to external factors such as heat, pH changes, or mechanical agitation. When egg white is subjected to boiling water, the heat causes the proteins to denature.

Coagulation and Solidification

Coagulation: Denatured proteins in egg white undergo coagulation, which is the process of transforming from a liquid to a solid state. As the proteins unfold and interact with each other, they form a network that traps water molecules, resulting in the solidification of the egg white.

Texture Changes

Texture: Boiling egg white leads to significant changes in its texture. Initially, the egg white is translucent and liquid, but as it coagulates, it becomes opaque and solid. The coagulated proteins create a firm and rubbery texture, different from the original gel-like consistency.

Color Changes

Color: The color of egg white also changes when boiled. Raw egg white appears clear, but as the proteins denature and coagulate, it turns white and opaque. This change in color is due to the scattering of light by the coagulated proteins, which reflects and diffuses light in various directions.

Nutritional Changes

Nutritional Value: Boiling egg white alters its nutritional composition to some extent. While the primary protein content remains relatively stable, some minor changes occur. Heat can reduce the bioavailability of certain vitamins and minerals present in egg white, such as vitamin B12 and biotin. However, the overall protein content and amino acid profile remain largely unaffected.


In conclusion, boiling egg white causes the proteins, mainly albumin, to denature and coagulate. This process leads to changes in texture, color, and to a lesser extent, the nutritional value of the egg white. The denatured proteins form a solid network, resulting in a rubbery texture and an opaque appearance. While some minor nutritional changes may occur, the protein content and amino acid profile remain relatively stable.


– Food Science & Nutrition. (2021). Denaturation and coagulation of proteins. Retrieved from foodsafety.wisc.edu
– United States Department of Agriculture. (2021). Egg, white, raw, fresh. Retrieved from ndb.nal.usda.gov