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Avicenna Journal of Phytomedicine، جلد ۶، شماره ۳، صفحات ۳۱۳-۳۲۱
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عنوان انگلیسی Effect of different brewing times on antioxidant activity and polyphenol content of loosely packed and bagged black teas (Camellia sinensisL.)
چکیده انگلیسی مقاله Objective: Determination and comparison of the effect of infusion time on the antioxidant activity and total polyphenol contents of bagged and loosely packed black teas. Materials and Methods: For twenty loosely packed and eleven bagged tea samples, the antioxidant activity and total polyphenol content were analyzed using FRAP and Folin-Ciocalteau methods, respectively. The ANOVA with Tukey post-hoc test and independent t-test were used for statistical analysis. Results: The antioxidant activity and polyphenol content of various brands of tea samples were significantly different. There were significant differences in the antioxidant activity of loosely packed teas between 5, 15(p=0.03), 30(p=0.02) and 60(p=0.007) minutes of brewing times. Besides, there was a significant difference in antioxidant activity of bagged samples infused for 1 minute with four other infusion time points (p< 0.001). In the case of polyphenol content, in loosely-packed tea samples, there were not significant differences between different brewing times (p=0.15). However, in bagged samples, the polyphenol contents of samples that were brewed for 1 minute were significantly lower than samples brewed for 3, 4, and 5 minutes (p< 0.05). The antioxidant activity and polyphenol content of tea bags were significantly higher than those ofloosely-packed forms of the same brands at 5-min of brewing time (p< 0.001). Conclusion: The infusion time and the form of tea (loosely packed or bagged) were shown to be important determinants of the antioxidant activity and polyphenol content of black tea infusions in addition to the variety, growing environment and manufacturing conditions.
کلیدواژه‌های انگلیسی مقاله Antioxidant, polyphenol, Tea, Infusion time
نویسندگان مقاله زینب نیک نیاز | zeinab nikniaz
liver and gastrointestinal disease research center, tabriz university of medical sciences, tabriz-iran

سازمان اصلی تایید شده: دانشگاه علوم پزشکی تبریز (Tabriz university of medical sciences)

رضا مهدوی | reza mahdavi
nutrition research center, tabriz university of medical sciences

سازمان اصلی تایید شده: دانشگاه علوم پزشکی تبریز (Tabriz university of medical sciences)

سید جمال قایم مقامی | seyed jamal ghaemmaghami
nutrition research centre, tabriz university of medical sciences, tabriz-iran

سازمان اصلی تایید شده: دانشگاه علوم پزشکی تبریز (Tabriz university of medical sciences)

ندا لطفی یقین | neda lotfi yaghin
student research committee, tabriz university of medical sciences

سازمان اصلی تایید شده: دانشگاه علوم پزشکی تبریز (Tabriz university of medical sciences)

لیلا نیک نیاز | leila nikniaz
tabriz health services management research center, tabriz university of medical sciences, tabriz-iran

سازمان اصلی تایید شده: دانشگاه علوم پزشکی تبریز (Tabriz university of medical sciences)

نشانی اینترنتی http://ajp.mums.ac.ir/article_5914.html
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زبان مقاله منتشر شده en
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نوع مقاله منتشر شده Original Research Article
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