Solubility
Solubility is one of the most important functional properties of protein hydrolysates and largely determines their
use in foods. This parameter was highly correlated with
the reduction in molecular weight and an increase in the number of smaller, more hydrophilic, and more solvated
polypeptide units via enzymatic hydrolysis, resulting in
an increase in the exposed net charge density [19].
A decrease in solubility after enzymatic hydrolysis may
occur when the protein molecule exposes more hydrophobic groups, therefore, to improve the solubility of milk
proteins, limited and selective hydrolysis is a critical
[7,16].