This might be the consequence of
the time/temperature conditions and water evaporation, with
effects on the water solubility of anthocyanins and the exposure
of these to polyphenoloxidase and peroxidase activities (Nayak
et al., 2015). An in-depth study to optimise the drying conditions
to provide better retention of TAC would thus be an appropriate
approach in the future. Similarly, decreases in TAC have been
observed in other studies during biscuit making from pigmented
wheat (Pasqualone et al., 2015) and from dough enriched in
grape-marc extract (Pasqualone et al., 2014), as well as during
the production of muffins with added purple wheat bran