There was a significant decrease in the anthocyanin contents in
snacks compared to the dough, which is later fried to make the
snacks (Table 5). The lowest losses were observed in products supplemented
with the flour from purple-fleshed tubers of the Blue
Congo variety (37.5%). In the remaining snack samples, much
higher losses were observed, ranging from 60% (Herbie 26) to
70% in snacks with flour from Valfi potatoes. Kita, Ba˛kowska-
Barczak, Hamouz, Kułakowska, and Lisin´ ska (2013) fried chips
from tubers of the same potato varieties and reported lower contents
of anthocyanins in the chips, from 22% to 81%, compared to
the raw material. In addition, they showed that the lowest losses
of anthocyanins were observed when Herbie 26 potatoes had been
used for crisps processing, and the highest losses were found with
the use of Blue Congo as a raw material. Lachman et al. (2012) stated
that thermal processes, when related to particular potato varieties,
showed a preservation of, or even a slight increase in, the
anthocyanin content and that this was dependent on the type of
process used: baking, microwaving, steaming or boiling.