Pastry, Cakes & Desserts
Whipped egg foams in sponge cakes are stabilized mainly by egg-white proteins forming a cohesive film and network around air bubbles. Ovomucin and related protein interactions appear especially important for holding the foam, while sucrose can improve egg-white foam stability by strengthening interfacial properties and helping maintain a suitable batter phase. During baking, the protein network must set before the bubbles coalesce or drain; excessive yolk contamination can weaken this structure.
When egg whites are whipped, proteins move to the air–liquid interface and help form films around the bubbles. The supplied research identifies ovotransferrin, ovalbumin, and ovomucoid as important for foam formation, while ovomucin and several other protein fractions increased during holding and were associated with foam stability. Protein solubility, complex formation, fragmentation, and polymerization were reported as relevant mechanisms. In cake batter, sucrose improved the stability of egg-white foams and increased interfacial elasticity, although the abstract indicates this was not simply an effect of increased viscosity. Heating then stabilizes the foam by producing an egg-white protein network; batters made from egg-white foams showed a stable network across the reported heating range. Batter rheology and interfacial properties also matter: higher-viscosity systems can support larger, more stable bubbles, while small amounts of yolk were associated with better heating rheology and higher yolk levels with poorer cake volume and overrun. These findings describe mechanisms suggested by the abstracts, not a single definitive explanation for every sponge-cake recipe.
Answer last checked 2026-08-19T02:43:48.203Z. Answerlog reads titles and abstracts, not full papers, and does not assess study quality or claim consensus.