dark buckwheat (29). However, the antioxidant capacity of an
extruded snack food was negatively affected (39). The higher
ORAC values of extrudates obtained at elevated barrel temperatures of 170 and 190 C were most likely due to the formation of
Maillard reaction products, which possess reducing capacity (40).
We believe this is the case because polyphenolics did not correlate
well with ORAC. The extrudates obtained at 190 C were visibly
darker than the other samples, indicating Maillard browning.