| 摘要 |
This invention relates to a process for the recovery of alpha -lactalbumin and/or beta -lactoglobulin enriched whey protein concentrate from a whey protein product. The process comprises the following steps: a) incubating a solution comprising whey protein product with a calcium-binding ionic exchange resin in its acid form to initiate the instabilization of alpha -lactalbumin, b) adjusting the pH of the treated protein product solution to a value between 4.3 and 4.8, after separation of the resin, c) incubating the protein product solution at a temperature between 10 and 50 DEG C. to promote the flocculation of alpha -lactalbumin, d) fractionating the proteins in the protein product solution at pH 4.3-4.8, providing an alpha -lactalbumin enriched fraction and a beta -lactoglobulin enriched fraction, e) raising the pH of the alpha -lactalbumin enriched fraction sufficiently to solubilize the alpha -lactalbumin fraction, and f) optionally raising the pH of the beta -lactoglobulin enriched fraction sufficiently to neutralize the beta -lactoglobulin fraction.
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