Increases in TEAC were observed in the extruded pasta for both
PDW and YDW. The rate of increase was similar and not significant
in the extruded pasta derived from semolina (1.4%, on average) and
more consistent and to a different extent when they were made
from semi-wholemeal (7.2% and 26.6%, for PDW and YDW, respectively).
During the early stages of processing, the natural phytochemicals
present in the flours can undergo different interactions
and modifications that are ascribable to the physical conditions
to which they are subjected. This can lead to their greater availability
in the matrix, contributing to the increase in TEAC. Furthermore,
it is known that during extrusion, rather than during
drying, different compounds with antioxidant activities can be produced
through the Maillard reaction (e.g., Amadori compounds)