beaten egg white

Beaten egg white is the protein-rich albumen of a chicken egg that has been mechanically agitated until it reaches a foam or meringue-like consistency. The beating process incorporates air into the liquid protein, creating a stable foam with significantly increased volume. Egg whites consist of approximately 90% water and 10% proteins, primarily ovalbumin, ovotransferrin, ovomucoid, and lysozyme. When agitated, these proteins denature and form a network that traps air bubbles, creating the characteristic light, airy texture. The degree of beating affects the final structure: soft peaks form when partial incorporation of air occurs, while stiff peaks develop with continued beating, creating a denser, more stable foam capable of holding shape.

Beaten egg whites function as a leavening agent in both sweet and savory preparations, providing volume and lightness without added fat. In desserts, they are essential to meringues, soufflés, mousse, chiffon cakes, and angel food cakes. Savory applications include Spanish tortillas, omelets lightened with folded beaten whites, and meat or fish forcemeats (farces). The foam's stability depends on the degree of beating and the presence of stabilizers such as sugar, salt, or acids (lemon juice, cream of tartar). Beaten egg whites must be incorporated gently into other ingredients to preserve the aerated structure. They are particularly valued in classical French cuisine and contemporary molecular gastronomy for creating texturally complex dishes.