Friday, December 22, 2017

Green Tea: Wuyi Cliff Oolong tea and Antioxidant activity

Wuyi Cliff Oolong tea, the best of Oolong, one of 3 ingredients of Tava Tea, is a species of Camellia sinensis belonging to the family Theaceae, native the Wuyi Mountain area. Its leaves and leaf buds has been used as tea in Chinese culture and many places in the world, including Wuyi Rock Tea, Tie Guan Yin tea, Taiwan tea and oolong tea, Iron Goddess of Mercy and other products in Fujian, etc.. Oolong can be bought as green or black tea but it is best known as a black tea in the process of withering under the strong sun and oxidation before curling and twisting.

Health Benefits of Oolong Tea - Antioxidant activity
a. In the assessment of catechins, gallic acid, and caffeine levels of antioxidant activity of samples of different teas of the study of "Determination of tea components with antioxidant activity" by Cabrera C, Giménez R, López MC.[14], researchers found that that green tea has a higher content of catechins than both oolong and fermented teas (red and black teas); the fermentation process during teamanufacturing reduces the levels of catechins significantly.

b. In the avaluation of the antioxidant effects of two major acylated flavonoid tetraglycosides were isolated from the methanol extract of oolong tea of the study of "Structural determination and DPPH radical-scavenging activity of two acylated flavonoid tetraglycosides in oolong tea(Camellia sinensis)." by Lee VS, Chen CR, Liao YW, Tzen JT, Chang CI.[14a], researchers found that 3-O-[2(G)-(E)-coumaroyl-3(G)-O-beta-D-glucosyl-3(R)-O-beta-D-glucosylrutinoside] and kaempferol 3-O-[2(G)-(E)-coumaroyl-3(G)-O-beta-D-glucosyl-3(R)-O-beta-D-glucosylrutinoside] exhibited scavenging activity against DPPH radical with EC(50) values of 30.5 and 487.2 microM, respectively.

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