Kohki tea

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Kohki tea (黄杞茶) or Huang Qi Tea is a Chinese/Japanese herbal drink very high in antioxidant activity. Kohki tea has been sold over the counter for centuries and is standardized to contain astilbin and taxifolin.

Astilbin chemical compound

Astilbin is a flavanonol, a type of flavonoid. Astilbin is the (2R-trans)-isomer; neoisoastilbin is the (2S-cis)-isomer and isoastilbin is the (2R-cis)-isomer.

Taxifolin chemical compound

Taxifolin (5,7,3',4'-flavan-on-ol), also known as dihydroquercetin, belongs to the subclass flavanonols in the flavonoids, which in turn is a class of polyphenols.

Astilbin can be isolated from Kohki tea processed from Engelhardtia chrysolepis (huang-qi). [1]

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