Fractionation method for whey protein, production method for composition including alpha-lactalbumin, and production method for composition including beta-lactoglobulin
A fractionation method for whey protein which involves a step for preparing a solution that includes a first whey protein and a second whey protein and a step for separating the first whey protein and the second whey protein by means of a membrane, and in which the first whey protein forms a complex with at least any one of carbonate ions, hydrogen carbonate ions, light metal ions, and transition metal ions, and the second whey protein satisfies (1) and/or (2): (1) does not form a complex with either carbonate ions or hydrogen carbonate ions； and (2) does not form a complex with either light metal ions or transition metal ions.
