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Ellagic acid

An aromatic compound belonging to the phenols (polyphenols) within the tannins, which forms creamy to light yellow crystals. It is a component of ellegtannins, which together with gallotannins (see under tannins) are found in fruits and leaves of buckthorn, blackberries, strawberries, pomegranates, raspberries, walnuts and roses. The rose family also includes the grapevine (see also grapevine systematics). Through acid hydrolysis, ellagtannins and gallotannins decompose into ellagic acid and gallic acid. Free ellagic acid in red wine comes largely from the wood phenols of oak. The concentration of unbound acid serves as an indicator for barrel age ing. Ellagic acid is also used as a flavouring food supplement.

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