Descriptive sensory profiling of double emulsions with gelled and non-gelled inner water phase.

The use of double emulsions (w1/o/w2) has been acknowledged as a promising strategy to reduce oil content in several food applications. Despite the potential of double emulsions for oil reduction, their sensory properties have not been investigated. In this study, we investigated sensory perception of double emulsions by descriptive sensory profiling using a trained panel (n=11). Two sets of emulsions with either 30 or 50% dispersed phase fraction were studied. Each set differed in composition (gelled and non-gelled inner w1 phase, gelatin as gelling agent) and fat reduction level (30 to 50%), but was similar in oil droplet size and viscosity. Fat reduction level depended on the amount of water droplets entrapped inside the oil droplets. Emulsions were evaluated on nine attributes describing taste (T), mouth-feel (MF) and after-feel (AF) perception, including thickness (MF), creaminess (MF, AF), fattiness (MF, AF), and cohesiveness (MF). The replacement of oil by small water droplets w1 did not decrease the intensity of fat-related attributes. When inner w1 droplets were gelled, 47wt.% of oil could be replaced while increasing the intensity of fat-related attributes. This indicates that the sensory perception of single and double emulsions with gelled and non-gelled w1 phase is mainly determined by the total oil droplet surface area. The composition of the inner water phase (gelled or not) also influences the sensory perception of double emulsions. We conclude that fat reduction up to 47wt.% can be achieved in double emulsions while maintaining or enhancing fat-related sensory perception.

How is an ideal satiating yogurt described? A case study with added-protein yogurts.

Protein is recognized as the macronutrient with the highest satiating ability. Yogurt can be an excellent basis for designing satiating food as it is protein-based food product. Five different set-type yogurts were formulated by adding extra skim milk powder (MP), whey protein concentrate (WPC), calcium caseinate (CAS) or a blend of whey protein concentrate with calcium caseinate (CAS-WPC). A control yogurt without extra protein content was also prepared. Differences in sensory perceptions (through CATA questions) were related to the consumers' expected satiating ability and liking scores (of several modalities). In addition, an "Ideal satiating yogurt" was included in the CATA question to perform a penalty analysis to show potential directions for yogurt reformulation and to relate sensory and non-sensory yogurt characteristics to satiating capacity.