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Zaid Mohammed Taha | ||
| Journal of Al-Nahrain University - Science | ||
| Article 1, Volume 13, Issue 3, 2010, Pages 99-103 | ||
| Author | ||
| Amira M. Albaldawi | ||
| Abstract | ||
| 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 -Tocopherol.S1 and S2 gave higher activity than BHA and BHT on the other hand -Tocopherol showed inhibition in antioxidant activity. | ||
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