egg white or binder

Egg white, also known as albumen, is the clear, viscous liquid component that surrounds the yolk of a chicken egg or other avian eggs. It comprises approximately 90% water and 10% proteins, primarily ovalbumin, ovotransferrin, ovomucoid, and lysozyme. Egg whites are colorless to translucent when raw and turn opaque white when coagulated through heat. The protein structure undergoes significant transformation when whipped, incorporating air and forming stable foam networks that are fundamental to culinary applications requiring leavening or binding. Commercially, egg whites are available as liquid pasteurized products or dried powder, offering convenience for large-scale production.

Egg whites lack the fat and cholesterol found in yolks, making them nutritionally distinct and preferred in applications where fat content must be minimized. Their functional properties—including coagulation, foaming, and emulsification—are derived entirely from their protein composition.

Egg whites serve as a critical binder and leavening agent across numerous culinary traditions. In baking, whipped egg whites create meringues, soufflés, and angel food cakes through their capacity to trap and stabilize air bubbles. They function as a binding agent in forcemeats, fish cakes, and meatballs, where they emulsify fats and proteins while adding structure. In pastry work, egg white glazes provide sheen and adhesion for toppings. In Asian cuisines, egg whites coat proteins before stir-frying or deep-frying, creating protective barriers that seal in moisture. Clarification of broths and consommés relies on egg white's coagulation properties to trap impurities. Cocktails such as whiskey sours traditionally use raw egg whites to create texture and mouthfeel, though pasteurized products are now standard for food safety.