Thermal and physical behaviour of honeys

In this work the thermal and physical behaviour of a number of selected hon eys has been investigated, also with reference to the scarcity of data foun d in literature. The AA studied water activity, rheological and thermal beh aviour of honeys, by means of dew point hygrometry, rotational and dynamic rheometry and differential scanning calorimetry. Water activity analysis co nfirmed liquid honey as a newtonian fluid and showed apparent pseudoplastic ity of honey when crystallized. Thermophysical properties studies allowed h oney most important phase transitions to be defined, allowing to draw a rep resentative state diagram for this product; besides, glass transition tempe rature shift after melting of crystallized honeys allowed the AA to elabora te an indirect method for the evaluation of crystallinity degree.