High pressure-induced changes in milk proteins and possible applications in dairy technology

This paper reviews the newest information on the effects of high pressure (HP) on whey proteins, caseins and milk enzymes, and discusses their influence on milk properties. HP treatments cause substantial modification to milk proteins and to the mineral balance of milk. Casein micelles disaggregate into smaller particles or aggregate, depending the intensity and the temperature of the HP treatment. Whey proteins are denatured, possibly interacting with the remnants of the casein micelles, and give aggregated forms different from those produced by heat treatment. These events influence rennet coagulation properties of milk, with micellar disintegration favoring coagulation and whey protein denaturation hindering the aggregation of renneted micelles and enhancing cheese yield. HP treatment of milk favors acid coagulation and produces acid gels whose structure is greatly determined by the different micellar sizes attainable and the degree of whey protein denaturation. Milk gels can also be formed from concentrated milk under HP, providing new structures inaccessible via conventional methods.

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