For mousse production, skimmed powdered milk, prebiotic FOS,
and whey protein concentrate (for mousses WPC, MFeWPC,
IeWPC, and MFeIeWPC) were previously incorporated in the
skimmed milk one day before the production, to dissolve these
powdered ingredients completely, and kept under refrigeration
(4 C) until the mixture with the further ingredients. One portion of
40 ml of this pre-mixture was sterilized and employed, in the next
day, for the fermentation of the probiotic culture during 150 min at
37 C.