The moisture sorption isotherms and the net isosteric heat of sorption are unique for every material and must be evaluated
experimentally. Fruit juices are challenging high-sugar content food products to dry. Fruit juice powders can be of more value in terms of transportation and handling, packaging and storage, and shelf life, compared with their liquid form.
Spray drying is one of the techniques used for producing powders from liquid solutions and suspensions. The spray-drying technique is 30-50 times cheaper than freeze drying. Orange juice is one of the most popular and more commonly consumed fruit juices. However, due to the presence of large amounts of sugars and acids in orange juice, significant product loss occurs during spray drying because of the stickiness of the powders Bhandari, 2007. Hence, drying aids have been added to orange juice to overcome the stickiness issue during spray drying. As a result, there are just few studies on the moisture sorption isotherms for orange juice powders produced by spray drying which have used drying aids during the spray-drying process.used liquid glucose as a drying aid to spray dry orange juice and determined the moisture sorption
isotherms for that mixture.