The net isosteric heat of desorption for vegetables was compared to
the one for fruits (Tsami et al., 1990a). In the case of vegetables, the net
isosteric heat of desorption remained significant for a wide range of
values of material moisture content, while in the case of fruits, it was
found negligible over this range of moisture content, and increased
dramatically when the material moisture approached zero. Moreover, in
the case of fruits the net isosteric heat of sorption was found to have a
slightly negative value for large values of material moisture content, a
phenomenon that was not observed in the case of vegetables.