Spray‐drying of pomegranate juice with prebiotic dietary fibre

Abstract

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.

Reformulation of spray‐dried apple concentrate and honey for the enhancement of drying process performance and the physicochemical properties of powders

“…This level of powder recovery during high‐temperature spray‐drying of honey or fruit concentrate/juice has not been presented before. A recent study showed that Nutriose provided high product yield (>60%) in spray‐drying of concentrated pomegranate juice . During spray‐drying of mountain tea, the highest product yield was obtained with maltodextrin (DE 12), followed by gum arabic, maltodextrin (DE 19), and β ‐cyclodextrin .…”

“…A recent study showed that Nutriose provided high product yield (>60%) in spray-drying of concentrated pomegranate juice. 19 During spray-drying of mountain tea, the highest product yield was obtained with maltodextrin (DE 12), followed by gum arabic, maltodextrin (DE 19), and ⊎-cyclodextrin. 45 Wilkowska et al 46 applied maltodextrin, hydroxypropyl-⊎-cyclodextrin, and ⊎-cyclodextrin for microencapsulation of blueberry juice by spray-drying, achieving a product yield of 43% for each carrier.…”

“…16,17 Furthermore, Jedlińska et al 18 used Nutriose®a resistant dextrinas a carrier while drying honey to obtain honey powder with additional pro-health (prebiotic) properties. Miravet et al 19 tested resistant dextrin (Nutriose) and fructooligosaccharides for use as drying-aid agents for the spray-drying of concentrated pomegranate juice, and concluded that resistant dextrin could be used with all kinds of fruit juices in substitution of maltodextrins, and the resulting prebiotic powders could be employed for formulating novel functional foods. Adhikari et al 20 applied proteins to solve the problem of stickiness during drying.…”

Advances in spray drying of sugar-rich products

“…0.42 (30:70) [26] up to 75% for standard spray drying [26] , up to 95% for dehumidified air spray drying [25] Applicable for a wide range of sugar-rich products.…”

“…Prebiotics may also be applied in the production of functional food [31] based on spray dried fruit juices and honey. Application of prebiotics as a drying carriers gives following advantages: high product yield, [26] a better retention of the total phenolic compounds [32] and anthocyanin [33] in comparison to conventional maltodextrin applied as a carrier, enhanced wettability [34] and solubility [26] of dry powder.…”