Scientists Unlock Secret To Thick, Stable Beer Foams

Swiss researchers have determined that fermentation degree controls beer foam stability after seven years of study published in Physics of Fluids. Triple-fermented Belgian beers maintained the longest-lasting foam while single-fermented lagers produced the shortest duration. The team tested six commercial beers including Westmalle Tripel, Tripel Karmeliet, and Swiss lagers Feldschlosschen and Chopfab. Surface viscosity dominated foam stability in single-fermented beers. Marangoni stresses from surface tension differences stabilized double- and triple-fermented beer foams. Lipid transfer protein 1 underwent progressive denaturation through successive fermentations. Single fermentation produced small round protein particles. Double fermentation created net-like protein structures. Triple fermentation broke proteins into hydrophobic and hydrophilic fragments that function as surfactants. ETH Zurich's Jan Vermant said breweries can now improve foam using these specific mechanisms rather than adjusting multiple factors simultaneously.

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