capability for scavenging superoxide anion radicals was quantified according
to the following equation:
Scavenging activity of O2
-
(%)=[(A1/min-A2/min)/(A1/min)]×100
where A1/min represents the absorbance per minute of the control solution
containing pyrogallol and buffer, and A2/min represents the absorbance per
minute of the sample.