Abstract
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.