The prebiotic fibres, resistant dextrin and fructooligosaccharides (FOS), were studied for use as drying-aid agents for the spray-drying of concentrated pomegranate juice, a low-caloric juice containing interesting health-related compounds. Resistant dextrin was the best drying-aid agent as only 0.5 g g CPJ À1 of resistant dextrin was needed to avoid powder stickiness, compared with 1 g g CPJ À1 of maltodextrins and 1.5 g g CPJ À1 of fructooligosaccharides. The best conditions for spray-drying a concentrated pomegranate juice (62.6% dry matter) using the resistant dextrin (NUTRIOSE) were 1.25 g NUTRIOSE g CPJ À1 and 0.10 g CPJ g solution À1, a liquid feed rate of 1.08 L h À1 and an air temperature of 160°C. Powders were easily solubilised in water, while storage at 25°C maintained the pomegranate bioactive components, and there were no stickiness problems for at least 2 months. Resistant dextrin could be used with all kind of fruit juices in substitution of maltodextrins, and the resulting prebiotic powders could be employed for formulating novel functional foods.
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