In a preferred embodiment a solution of heat-treated protein (e.g. lactalbumin) is hydrolysed chemically or enzymically (e.g. with pancreatin), the hydrolysed product with optimum DM content of 9-13% is heated to 98A° C with 30 min holding or to 130A° C for 1 min and fed into an ultrafiltration plant with membranes having a cut-out zone of 1000-10 000. The ultrafiltration permeate, which is the purified hydrolysate, may be incorporated into various food preparations intended for dietetic uses, particularly for infants and convalescents and for people suffering from allergies.

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