Define the Functional Properties of Proteins?

a) Hydration properties (dependent on protein-water interactions), which include properties like swelling, adhesion, dispersibility, solubility and viscosity.

b) Properties related to protein-protein interactions, which involves the processes of precipitation, gelation and formation of other structures (like protein doughs and fibers).

c) Surface properties, which relates primarily to surface tension, emulsification and foaming characteristics of proteins.

As you can see, these three groups are not totally independent. For example, gelation involves not only protein-protein interactions but also protein-water interactions. Also viscosity and solubility are both dependent on protein-water as well as protein-protein interactions.