Protein concentrates and protein isolates, in addition to processes for the production of protein concentrates hydrolyzates thereof and protein isolates, are disclosed. In particular, the disclosure relates to a process for removing fiber from an oilseed meal, comprising:i) mixing an oilseed meal with a blending solvent, optionally water, saline solution, polysaccharide solution or protein containing solution, to form a mixture；ii) optionally adjusting the pH of the protein slurry to a pH of about 2 to about 10；iii) separating the mixture to form a protein slurry comprising soluble and insoluble proteins and an insoluble fiber fraction, andiv) hydrolyzing the insoluble proteins.
