Thermal Transitions of Pomegranate Extracts Using Modulated Differential Scanning Calorimeter (MDSC)

Modulated Differential Scanning Calorimetry (MDSC) was used to investigate thermal transitions of pomegranate extracts as a function of concentration. The transitions were the glass transition temperatures (T g ) and maximum freeze-concentration condition (), melting points (T f ), the onset temperatures of ice melting (), and latent heat of fusion (H L ). In addition, the specific heat (C p ) below and above freezing was also determined. The soluble solid contents for the pomegranate extracts ranged from 20 to 53°Brix. The T g and values ranged from −43.3 to −49.3 and from −44.9 to −52.0°C, respectively. On the other hand, T f and ranged from −2.6 to −16.7 and from −39.6 to −45.3°C, respectively. The latent heat of fusion was between 61.6 and 204.7 kJ/kg. Below freezing, a linear relationship was established between specific heat and temperature, while above freezing range the change of specific heat was relatively low.