Physical Evaluation and Hygroscopic Behavior of Dragon Fruit ( Hylocereus undatus) Lyophilized Pulp Powder

Relations between moisture content and water activity of foodstuff can be estimated by determining moisture sorption isotherms. This work aimed at investigating the hygroscopic behavior of dragon fruit powder through sorption isotherms, encapsulated with maltodextrin, and analyzing hygroscopicity, density, and caking degree of samples stored in polyethylene wrappings and laminated coverings at 25 degrees C. Dragon fruit powder showed good results regarding hygroscopicity, density, and caking degree for laminated coverings. In order to describe balance of sorption isotherms, the BET model was the most recommended.