ANTIOXIDANT ACTIVITY OF PHENOLIC EXTRACTS FROM BLACK TEA

Phenolic compounds extracts from black tea (obtained from local markets) were extracted by hot and cold methods to test their antioxidant activity by determination of thiobarbituric acid No. (TBA%). Effect of different concentrations( 0.02, 0.04, 0.08 ) % of extracts and time of incubation (30days) at 40 ˚C were studied, hot method phenolic extract(S2)gave a positive concentration effect on antioxidant activity, cold method phenolic extract ( S1 ) gave a limited concentration effect. S1 and S2 gave continuous decrease in TBA % after different periods of incubation time, S2 showed higher antioxidant activity than S1,S1 and S2 antioxidant activity were compared with synthetic antioxidants BHA and BHT and natural antioxidant activity α-Tocopherol.S1 and S2 gave higher activity than BHA and BHT on the other hand -Tocopherol showed inhibition in antioxidant activity.