gallic acid

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gallic acid

The Columbia Encyclopedia, Sixth Edition | 2008 | The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press. (Hide copyright information) Copyright

gallic acid or 3,4,5-trihydroxybenzoic acid , C 6 H 2 (OH) 3 CO 2 H, colorless crystalline organic acid found in gallnuts, sumach, tea leaves, oak bark, and many other plants, both in its free state and as part of the tannin molecule (see tannin ). Since gallic acid has hydroxyl groups and a carboxylic acid group in the same molecule, two molecules of it can react with one another to form an ester, digallic acid. Gallic acid is obtained by the hydrolysis of tannic acid with sulfuric acid. When heated above 220°C, gallic acid loses carbon dioxide to form pyrogallol, or 1,2,3-trihydroxybenzene, C 6 H 3 (OH) 3 , which is used in the production of azo dyes and photographic developers and in laboratories for absorbing oxygen.

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gallic acid

The Oxford Pocket Dictionary of Current English | 2009 | © The Oxford Pocket Dictionary of Current English 2009, originally published by Oxford University Press 2009. (Hide copyright information) Copyright

gal·lic ac·id / ˈgalik; ˈgôlik/ • n. Chem. an acid, C6H2(OH)3COOH, extracted from oak galls and other vegetable products, formerly used in making ink.

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3,4,5-trihydroxy- benzoic acid

The Columbia Encyclopedia, Sixth Edition | 2008 | The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press. (Hide copyright information) Copyright

3,4,5-trihydroxy- benzoic acid IUPAC name for gallic acid .

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