The reducing power of an antioxidant compound is associated with the presence of reductones and their antioxidant capacity is based on the breaking of the free radical chain reaction by donating a hydrogen atom, and preventing peroxide formation. Reducing power of only barley cookie dough was significantly higher (41.2 mmol ascorbic acid equivalents/g) and that of only wheat cookies dough was 9.8 mmol ascorbic acid equivalents/g (Table 4).