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Epigallocatechin gallate (EGCG), also known as epigallocatechin-3-gallate, is the ester of epigallocatechin and gallic acid, and is a type of catechin.. EGCG – the most abundant catechin in tea – is a polyphenol under basic research for its potential to affect human health and disease.
Polyphenon is a series of high grade green tea polyphenol extracts manufactured by the Mitsui Norin Co., Ltd. of Japan. [1] [2] The extracts are in part the result of a water based extraction method which begins with green tea leaves, and then involves successive steps which concentrate the catechins thought to be responsible for the health benefits of green tea.
[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]
Catechins are diverse among foods, [15] from peaches [17] to green tea and vinegar. [15] [18] Catechins are found in barley grain, where they are the main phenolic compound responsible for dough discoloration. [19] The taste associated with monomeric (+)-catechin or (−)-epicatechin is described as slightly astringent, but not bitter. [20]
Epicatechin gallate (ECG) is a flavan-3-ol, a type of flavonoid, present in green tea. [1] It is also reported in buckwheat [2] and in grape. [3]The tea component epicatechin gallate is being researched because in vitro experiments showed it can reverse methicillin resistance in bacteria such as Staphylococcus aureus. [1]
Matcha green tea is high in vitamins and minerals, including vitamins C and E, magnesium, and potassium. Matcha also has bioactive compounds, such as theanine and catechins.