Other compounds, such as phospholipids, which are naturally
occurring in milk or in commonly added ingredients, such as egg
yolk, also have an impact on the lipidewater interface. Zwitterionic
phospholipids, like phosphatidylcholine, tend to coexist with milk
proteins at interfaces. For example, in combination with sodium
caseinate, lecithin does not predominate at the interface, it merely
reduces the strength of the proteineprotein interactions. This allows
for increased surface mobility and thinning of the caseinate in
the adsorbed layer (Dickinson, 2003). Some phospholipids merely