Fructose, glucose and citric acid are the main components of orange juice with very low Tg values (5, 31 and 16 °C, respectively) in a pure, dry state, which decrease drastically when moisture is absorbed. During spray drying, fruit juice forms an amorphous solid or a syrupy/sticky powder; sticky products are typically produced because the low glass transition temperature (Tg), high viscosity, low melting point and high hygroscopicity lead the juice components to adhere to the drying chamber and agglomerate on the conveying system.