Therefore, moisture content is low at low water activity region, while at high water activities dissolution of sugars occurs and crystalline sugars are converted into their amorphous form. So the amount of water to be adsorbed in creases greatly after this transition because of the increase in the number of adsorption sites upon breakage of the crystalline struc ture of sugars. This form of isotherms is similar to those observed for dried apricot, figs and raisins (Ayranci et al., 1990; Tsami et al.,