Patent ID: 7018665

Claim:
A process of separating a preselected whey protein or group of whey proteins from a whey protein-containing solution, wherein the process comprises the following steps: (a) containing a whey protein-containing solution with an anion exchange at a pH level at which the preselected protein a group of proteins adsorbs to the anion exchanger, and wherein the anion exchanger comprises a water insoluble, hydrophilic, water swellable, hydroxy (C 2 –C 4 ) alkylated and cross-linked regenerated cellulose, derivatised with quaternary amino (QA) groups, wherein the level of substitution of the QA groups is 1.4 milli-equivalents per dry gram of anion exchanger (meq/g) or greater; and (b) recovering either or both of the following: (1) the whey protein or proteins adsorbed in step (a) and (2) the breakthrough whey protein or proteins not adsorbed in step (a).