The ferric reducing ability power of all extracts of rice fractions
expressed in FRAP value (lmol FeSO4/g) are shown in Table 2. The
different fractions from three sites showed significant (p < 0.05) differences
in FRAP value, indicating that the location sites significantly
influenced the ferric reducing power evaluation. Regardless
of the location sites, the FRAP value of different fraction extracts
indicated that the bran fraction had the greatest reducing power
(27.5–32.2 lmol FeSO4/g) followed by husk (12.4–28.2 lmol FeSO4/g), brown rice (6.4–12.5 lmol FeSO4/g), and then milled rice
(4.6–6.5 lmol FeSO4/g). In addition, all fractions of rice sample obtained
from site 1 possessed lower FRAP values compared to other
sites, except for the bran fractions. The bran fractions gave high FRAP values that may be due to their higher TPC. The results
showed that the FRAP values were dependent on the variations in
TPC. However, the husk from site 2 showed that the FRAP values
were consistent with antioxidant capacity detected by the DPPH
assay.