In order to check this
presumption, the effects of NO on the antioxidant activities of
the mushrooms were examined, using several chemical and biochemical assays: reducing power (measuring the conversion of a Fe3+
ferricyanide complex to the ferrous form), scavenging activity on DPPH radicals (measuring the decrease in DPPH radical
absorption after exposure to radical scavengers), metal chelating
(by measuring colour reduction in the Fe2+
ferrozine complex),
and scavenging effect on hydroxyl free radicals (measured by the
color intensity of the Fenton reaction system).