is a very stable free radical with a center of
nitrogen and if it is scavenged, the sample is proved to
have an activity of lowering the valid concentration of
hydroxide radical, alkyl radical or peroxide radical and
breaking the lipid oxidant chain. DPPH.
has a single
electron which features strong absorption at 517 nm
with a color of dark purple, and after adding samples in
it, the activity of DPPH.
scavenging can be observed at
517 nm (Badami et al. 2003; Liu et al. 2008).