The most widely used protein foaming agents are: egg white, gelatins, casein, other milk proteins, soy proteins, and gluten. Proteins vary significantly in their foaming properties; for example, serum albumin is an excellent foaming agentwhile purified ovalbumin is poor. Protein foaming agents should possess the following properties. They should stabilize foams rapidly and effectively at low concentrations; perfonn as an effective foaming agent over the pH range which exists in various foods; perfonn effectively as a foaming agent in the medium with foam inhibitors such as fat, alcohol or flavor substances.