Snacks produced with coloured potato flour had 2–3 times
higher antioxidant activity, particularly when measured by DPPH,
compared to control samples with commercial potato grits as the
flour component and contained on average 40% more of polyphenols.
The processes of low shear extrusion and frying utilised for
snack production affected a decrease in the antioxidant activity of
products with flour from the Blue Congo and Valfi varieties but an
increase in activity in snacks with flour from the Salad Blue and
Herbie 26 varieties. The anthocyanin content in snacks depends
on the variety of potato used for coloured flour production. The
highest content of these compounds and the lowest losses during
snack processing were in snacks with flour from the purple-fleshed
Blue Congo and the red-fleshed Herbie 26 potatoes. The utilisation
of experimental, coloured potato flours favourably affected the colour
and expansion index of the obtained snacks and did not changed
their texture. In particular, the red-coloured flour from Herbie
26 potatoes resulted in an attractive snack colour..