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[10] [11] Tea has one of the highest contents of flavonoids among common food and beverage products. [7] Catechins are the largest type of flavonoids in growing tea leaves. [6] According to a report released by USDA, in a 200-ml cup of tea, the mean total content of flavonoids is 266.68 mg for green tea, and 233.12 mg for black tea. [7]
All tea leaves contain fluoride; however, mature leaves contain as much as 10 to 20 times the fluoride levels of young leaves from the same plant. [9] [10]The fluoride content of a tea leaf depends on the leaf picking method used and the fluoride content of the soil from which it has been grown; tea plants absorb this element at a greater rate than other plants.
Tea contains small amounts of theobromine and theophylline, which are xanthines and stimulants, similar to caffeine. [59] Fresh tea leaves in various stages of growth. The astringency in tea can be attributed to the presence of polyphenols. These are the most abundant compounds in tea leaves, making up 30–40% of their composition. [60]
Tips to Maximize Antioxidant Absorption in Tea. To get the most out of this dynamic tea-lemon duo, consider these tips: Use fresh lemon juice. This contains the highest levels of vitamin C, says ...
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Sheng-Dun Lin, et al., Bioactive components and antioxidant properties of g-aminobutyric acid (GABA) tea leaves. LWT – Food Science and Technology Volume 46, Issue 1, April 2012, pp. 64–70; Hsueh Fang Wang, et al., Comparison of bioactive components in GABA tea and green tea produced in Taiwan. Department of Food Science, National Chung ...
Other tests measure the antioxidant capacity of a fraction. Some make use of the 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) radical cation, which is reactive towards most antioxidants including phenolics, thiols and vitamin C. [35] During this reaction, the blue ABTS radical cation is converted back to its colorless neutral form.
They found that tea bags made with the plastic substance polypropylene—used to heat-seal tea bags shut—released about 1.2 billion small pieces of plastic per milliliter of tea, while bags made ...
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