Compared
with the control cookies baked at 200 C for 7 min, the cookies prepared with 0.5 g/100 g added citric
acid and baked at 150 C for 12 min had higher contents of total flavonoids and anthocyanins by 60 and 70%, respectively. However, as a result of Maillard reaction inhibition at low pH, antioxidant capacity of anthocyanins-rich blue popping corn and blue standard corn cookies with 0.5 and 1 g/100 g citric acid was lower by 56 and 39%, respectively, compared to antioxidant capacity of their control cookies baked at
200 C for 10 min.