Fig. 1 shows that total antioxidant capacity expressed as Trolox equivalents (lmol/g dry wt) has a complex relationship
with antioxidant content. First, it is clear that bran exhibits more antioxidant capacity than brown rice powder as expected from the fact that bran contains more antioxidants per unit weight (Table 1). However, ORAC values are around 4-fold higher than either the corresponding FRAP or ABTS values in both bran and brown rice powder.
It has previously been shown that FRAP and ORAC