The moisture sorption isotherms for spray-dried pure orange juice have been studied at four different temperatures; 20C, 30C, 40C and 50C. Eleven different sorption models have been fitted to the experimental data. The GAB model fitted the experimental data well over a wider range of temperatures. Therefore the GAB model was chosen as the preferred model for predicting the moisture sorption isotherms of pure spray-dried orange juice powders. The GAB parameters were also determined using direct