The interfacial properties of the fat globules after aging of mix
are typically dictated more by the emulsifiers than by the proteins
(Goff & Hartel, 2013). About 0.1e0.3% emulsifiers are typically
added to ice cream mix to help destabilize the emulsion. These
small molecular weight surfactants, typically mono- and diglycerides
and polysorbate 80, lower the surface tension more
drastically than proteins and at much lower concentrations. As
such, they decrease the overall interfacial energy, which makes it
thermodynamically favorable for them to displace the proteins
from the adsorbed layer on the fat globules (Nylander, Arnebrant,
Bos, & Wilde, 2008). This makes the interface less stable and allows
formation of partially-coalesced clusters during freezing.