The CD of blueberry extracts was significantly influenced by the
drying methods (Table 3). The strongest changes in CD of blueberry
extracts were noted during HACD at 90 C; the colour density
increased almost 1.7-fold when compared to non-dried blueberries
extracts. It indicates the possibility of polymerization reactions that
took place during HACD. HACD at 90 C + MWVD shortened the
duration of the process and resulted in the lowest value of polymeric
colour. An increase in PC was observed in dried blueberries
compared to frozen/thawed fruit used as a control sample. As in case
of CD of blueberry extracts, the greatest changes in PC of blueberry
extracts were noted using HACD at 90 C. A significant increase in %
PC, from 11.3 ± 0.8 to 75.7 ± 0.2, was found for blueberries dried
using HACD 90 C. It was related to the strongest changes in the content
of TMA, i.e. from 0.60 ± 0.01 to 0.03 ± 0.01 g Cy-3-G 100 g1
DM. In contrast, the lowest increase in % PC, from 11.30 ± 0.83 to
30.44 ± 0.98, indicated for blueberries dried using HACD 90 C
+ MWVD was related to the smallest decrease in the concentration
.