There are also few studies on the sorption isotherms of pure orange juice powder produced with other techniques, such as
freeze drying. Studied moisture sorption isotherms of pure dehydrated orange juice that had been produced by a company named Orange Crystals, Inc., Plant City, Florida. It is understood that the dehydrated juice had been produced by a vacuum-belt dryer and a freeze-drying technique. It has been reported in the literature that, for some food products, the drying method can affect the sorption isotherms of the final product significantly. Hence there is a need to study the moisture sorption isotherms of pure spray-dried orange juice powders.