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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.
Natural phenols are a class of molecules found in abundance in plants. Many common foods contain rich sources of polyphenols which have antioxidant properties only in test tube studies. As interpreted by the Linus Pauling Institute, dietary polyphenols have little or no direct antioxidant food value following digestion. [7]
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 ...
In addition to a zone 8 climate or warmer, tea plants require at least 127 cm (50 in) of rainfall per year and prefer acidic soils. [77] Many high-quality tea plants are cultivated at elevations of up to 1,500 m (4,900 ft) above sea level. Though at these heights the plants grow more slowly, they acquire a better flavour. [78]
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 ...
In 2018, the European Food Safety Authority stated that daily intake of 800 mg or more could increase risk of liver damage. [14] Taken as a capsule or tablet 338 mg per day of EGCG is considered safe, whereas 704 mg per day is safe if consumed as a tea beverage. [13] 100 mL of green tea contains about 70.2 mg of EGCG (about 165 mg per cup). [14]
Kaempferol (3,4′,5,7-tetrahydroxyflavone) is a natural flavonol, a type of flavonoid, found in a variety of plants and plant-derived foods including kale, beans, tea, spinach, and broccoli. [1] Kaempferol is a yellow crystalline solid with a melting point of 276–278 °C (529–532 °F).