A different behaviour was observed in the case of MC that in the gummy candies showed a retention index > 1, to indicate a enhanced release and only in the case of the samples prepared with pectin and gelatine –starch a value d 1 was observed. This could be due to its limited solubility but also to a “salting out” effect induced by the sugars in the candies [8, 9].
Electronic Nose analysis was carried out on the vapour phase of the gummy candies under the standardised procedure described in Materials and methods; principal component analysis (PCA) was then carried out to discriminate between groups of signals and, thus between different samples. Meaningful difference was observed among all the gummy samples; in particular P and GA signals resulted located in opposite regions and thus inversely correlated (data not shown).
The kinetics of the volatiles release from the candies under dissolution conditions in water varied depending on the aroma nature and the physical properties of the systems as affected by the gelling agent. This experiment was carried out to mimic the dissolution of a candy in the mouth due to the saliva. In Figure 2 the variation of the GC area of the aroma compounds in the head space of P and GA candies as a function of the dissolution time are reported