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Com.arative Study of the Antioxidant Activity of Two Popular Green Tea Beverages Available in the Local m.rket of Saudi Arabia

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Natural Science 2016年第6期8卷 227-234页

作者： Ulfat m. Om.r Ayat m. Shorbaji entesar m. arrait Tasneem.D. Al Agha Hala F. Al-m.rzouki Huda A. Al Doghaither Ayat B. Al-Ghafari Departm.nt of Biochem.stry Faculty of Science King Abdulaziz University Jeddah KSA

Antioxidants have num.rous applications due to their m.ltiple roles in dim.nishing harm.ul effects of oxidative stress. The objective of this work was to highlight the im.ortance of green tea by evaluating the antioxidant activity of the m.st popular green tea brands in Saudi Arabia, Lipton and Rabea. To our knowledge, no studies have so far been done to estim.te the antioxidant activity of these brands. To determ.ne the antioxidant activities of these two brands, 10 m./m. of each brand was extracted and their total phenolic content (TPC), 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity, hydrogen peroxide scavenging activity, ferric reducing power and ferrous ion chelating effect were m.asured. The TPC of Lipton tea was 678.7 υg of gallic acid equivalents (GAE)/10m., whereas in Rabea tea, the TPC was 647.1 υg GAE/10m.. The presence study indicated that there were no significant differences in total phenolic contents and the percentage inhibition as shown in DPPH and H2O2 assays am.ng Lipton and Rabea green teas. m.reover, it was found that all assays have exhibited high antioxidant activity in both green teas. In conclusion, our study showed evidence for evenness and stability of the antioxidant activity of the two com.ercial green teas available in the m.rkets of Saudi Arabia. Continued researches are needed to further the current knowledge on the health-prom.ting effects of this popular beverage using different supplem.nts by different m.chanism..

关键词： Green Tea Polyphenols Antioxidants Radical Scavenging Activity Total Phenolic Content

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