EC50 value (mg extract/ml) is the effective concentration at which the antioxidant activity was 50%; the absorbance was 0.5 for reducing power; DPPH radicals were scavenged by 50%; and ferrous ions were chelated by 50%. EC50 value was obtained by interpolation from linear regression analysis. Each antioxidant attribute of ethanolic extracts from sponge cakes was averaged from four replications.