Rare sugars such as D-allulose (Alu) provide benefits including low calories and prebiotic potential, but their low glass transition temperatures make spray-drying challenging. In this study, dextrin-based additives-such as maltodextrins (MDs) with dextrose equivalents (DEs) of 25, 11, and 4, as well as resistant maltodextrin (RMD)-were used to evaluate the spray-drying performance of powders containing Alu and D-fructose (Fru). Solutions with each additive at ratios of 30:70, 20:80, and 10:90 were spray-dried at 140 degrees C. Powder yield, moisture content, particle size, density, flowability, wettability, dissolution kinetics, and hygroscopicity were analyzed. For RMD and MD (DE = 11) exhibited favorable yields; notably, RMD yielded over 50 % even with Alu, which has a low glass transition temperature, at a loading exceeding 80 %, while MD (DE = 4) produced yields below 40 %. RMD-based powders showed high yields and good dissolution but increased hygroscopicity, indicating a trade-off between performance and stability.
