Tile antiradical activities of various antioxidants were determined using the free radical, 2.2-Diphenyl-l-pict3,1hydrazyl (DPPI-I°). In its
radical form, DPPI-I° has an absorption band at 515 nm which disappears upon reduction by an antiradical compound. Twenty
compounds were reacted with the DPPI-I° and shown to follow one of three possible reaction kinetic types. Ascorbie acid, isoascorbic
acid and isoeugenol reacted quickly with the DPPI-I° reaching a steady state immediately. Rosmarinic acid and 6-tocopherol reacted a
little slower and reached a steady state within 30 rain. The remaining compoundsreacted more progressively with the DPPH° reaching
a steady state from I to 6 h. Caffeic acid, gentisic acid and gallic acid showed the highest antiradical activities with a stoichiometo, of 4
to 6 reduced DPPH° molecules pet" molecule of antioxidant. Vanillin, phenol, y-resort3'lic acid and vanillic acid were found to be poor
antiradical compounds. The stoichiometry, for the other 13 phenolic compounds varied from one to three reduced DPPH° molecules pet"
molecule of antioxidant. Possible mechanisms are proposed to explain the e.werimental results.