The oligosaccharide fraction F2 showed very low DPPH radical
scavenging activity, with values of 6.33% and 2.91% for white and
gold sesame seeds, respectively. On the other hand, it had relatively
high ORAC values of 5347 and 6068 lmol TE/100 g for white
and gold sesame seeds, respectively. These results may be
explained by the difference in reaction medium, as the ORAC
method uses PBS, which is favorable for hydrophilic compounds
such as oligosaccharides. In addition, DPPH free radicals are not
similar to the highly reactive peroxyl radicals usually involved in
lipid peroxidation in vivo (Huang, Ou, & Prior, 2005). Whereas,
AAPH-derived radicals used in the ORAC assay mimic peroxyl radical-
induced oxidation (Tai et al., 2011). Therefore, the ORAC assay
is a more accurate method for quantifying peroxyl radical scavenging
capacity in vitro.