The scavenging ability on DPPH radicals assayed herein was
summarized in Table 4 and the results were expressed as EC50
values for comparison. The effectiveness of scavenging ability was
inversely correlated with their EC50 values. The effectiveness in
scavenging ability on DPPH radicals was in the descending order:
BR100 > BR90 > BR80 > BR70 > BR60 > BR50 > BR40 >
BR30 > BR20 > BR10 > control. The result showed that
supplemented black rice greatly enhanced antioxidant activity of
the chiffon cakes. Both total phenols (r ¼ 0.904, p < 0.001) and
total anthocyanins (r ¼ 0.814, p < 0.01) contents in extracts were
significantly negative correlated to their EC50 values. These results
suggest that total phenols and total anthocyanins have a strong
effect on the antioxidant activity of the black rice chiffon cake
samples.