why does beer foam stay long in a layer on top of glass, and sodas or other bubbly drinks don’t have this kinda thing?

Question

why does beer foam stay long in a layer on top of glass, and sodas or other bubbly drinks don’t have this kinda thing?

In: 9

Answer 1

When brewing beer you do get some of the protein from the grain, hops and yeast in the beer. It is not much from a nutritional standpoint. But especially the gluten from the grain will form into long chains that can form membranes. This means that the foam gets reinforced by the protein and behave quite differently from other drinks.