Turgut TASKİN, Muhammed LEVENT, Talip SAHİN

Investigation of the Effects of Biological Activity and Steeping Time of Four Different Black Teas Commercially Valuable in Turkey

Objective: The aim of this study was to compare the phenolic, tannins contents and biological activities (antioxidant, anticholinesterase) of four different black teas commercially valuable in Turkey. Subsequently, to examine the effect of the steeping time on the chemical contents (phenolic and tannins contents) and biological activities of the samples.

Keywords:

Black teas antioxidant, anticholinesterase, steeping time,

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1. Ramdani D, Chaudhry AS, Seal CJ. Chemical composition, plant secondary metabolites, and minerals of green and black teas and the effect of different tea-to-water ratios during their extraction on the composition of their spent leaves as potential additives for ruminants. J Agric Food Chem. 2013; 61: 4961-4967.
2. Sharma V, Rao JM. A Thought on the biological activities of black tea. Crit Rev Food Sci Nutr. 2009; 49:379-404.
3. Čestić SR, Radojković MM, Cvetanović AD, Mašković P, Durovi SD. Influence of steeping time on biological activity of black mulberry leaves tea. APTEFF. 2016; 47: 1-265.
4. McAlpine MD, Ward WE. Influence of steep time on polyphenol content and antioxidant capacity of black, green, rooibos, and herbal teas. Beverages. 2016; doi:10.3390/beverages2030017.
5. Ozsoy N, Can A, Yanardağ R, Akev N. Antioxidant activity of Smilax excelsa L. leaf extracts. Food Chem. 2008; 110(3): 571-583.
6. Vijay DT, Rajendra SB. Estimation of total phenol, tannin, alkaloid and flavonoid in Hibiscus tiliaceus L. wood extracts. research and review: J. Pharmacog, Phytochem. 2014; 2(4): 41-47.
7. Wei F, Jinglou C, Yaling C, Yongfang L, Liming C, Lei P. Antioxidant, free radical scavenging, anti-inflammatoryand hepatoprotective potential of the extract from Parathelypteris nipponica (Franch.etSav.) Ching. J Ethnopharmacol. 2010; 130(3): 521-28.
8. Benzie IF, Strain JJ. The ferric reducing ability of plasma (FRAP) as a measure of "antioxidant power": the FRAP assay. Anal Biochem.1996; 239(1): 70-76.
9. Taskin D, Alkaya BD, Dölen E. HPLC-DAD/ESI-Q-TOF LC/MS Analysis of major phenolic compounds in flowers, leaves and stems of Achillea grandifolia and evaluation of their individual antioxidant properties, Chiang Mai J Sci. 2017;44(x):1-12.
10. Ellman GL, Courtney KD, Andress V, Featherstone RM. A new and rapid colorimetric determination of acetylcholinesterase activity. Biochem Pharmacol. 1961;7: 88-95.