The highest increase of FRAP
antioxidant activity was observed in flour from Herbie 26 potatoes
(15 times as much as raw material) and the lowest in flour from
Blue Congo potatoes (1–3 times higher). Experimental flour manufactured
from tubers of the purple-fleshed Salad Blue variety and
the red-fleshed Herbie 26 had much higher antioxidant activity
than the raw material and also had higher or similar activity compared
to the flour prepared from the remaining 2 potato varieties.