Keywords: AA, ascorbate; DCF, dichlorofluorescein; DHA, dehydroascorbate; EDDHA, ethylenediamine-N,N′-bis(2-hydroxyphenylacetic acid); EDTA, ethylenediaminetetraacetic acid disodium salt; H2DCF-DA, 2′,7,-dichlorodihydrofluorescein diacetate; HQ, 8-hydroxyquinoline;