Moisture Sorption Behavior of Cupuassu Powder

In this research, the hygroscopic behavior of cupuassu (Theobroma grandiflorum) powder containing 40% maltodextrin was studied via the moisture adsorption and desorption isotherms at 25°C. The experimental sorption data of the cupuassu powder were fitted using the Halsey, Henderson, Oswin, GAB and Peleg models. In addition, the powder morphology was assessed using scanning electron microscopy. Moisture sorption isotherms curves showed type III behavior, typical of foods rich in soluble components, such as sugars, present in the samples. The adsorption curve indicated that the product requires greater attention when stored and handled in environments with relative humidity above 50%. The microbiological stability of the product is assured up to 11.5% moisture content. During the product storage, it is recommended to use packaging with water vapor and air impermeability, due to the presence of porous microspheres that affect the protection of the active material and facilitate the moisture gain. Among the models evaluated, the Peleg and GAB models presented good suitability on predicting the product’s sorption isotherms.