As reported above, the bigger complexity of the DSC profiles of skim and whole milk powders compared to protein concentrates did not allow to detect these transitions in dried milk powder curves, probably due to the overlapping with the Tg/enthalpic relaxation transition and with other exothermic transitions. It is also reported [32] that in mixed system the glass transition may be broad, making difficult the DSC detection. Moreover, because of the known plasticizing effect of sugars on proteins, lactose may have caused the decrease in the protein glass transition and the overlapping with certain other transitions visible at lower temperatures [32].