Differential scanning calorimetry (DSC) was used to measure phase transitions in samples of Golden Delicious apples after freeze-drying and osmotic drying in a sucrose solution. From DSC traces, glass transition (T-g) and melting (T-m) temperatures were obtained and used to plot the state diagrams for the two types of samples. The Gordon-Taylor equation was able to predict the dependence of the glass transition temperature on moisture content. Before calorimetric analysis, dehydrated samples were equilibrated under a wide range of different relative humidities (a(w) 0.12-0.93) and sorption isotherms determined. Experimental sorption isotherms agreed with previous results reported in the literature.