gallic acid
The Columbia Encyclopedia, Sixth Edition | Date: 2008
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.
Author not available, GALLIC ACID.,
The Columbia Encyclopedia, Sixth Edition 2008
The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press
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; Pharmacokinetics of Gallic Acid and Its Relative Bioavailability from Tea in Healthy Humans1 ABSTRACT Gallic acid (GA), a food component that is especially ... bioavailability * humans * HPLC Gallic acid (GA)3 is an endogenous product found ...
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Photochemistry and Photobiology; 12/1/1998; Yoshiki, Y; Yuan, H; Iida, T; Kawane, M; Et al; 787 words
; ... emitted from the H^sub 2^O^sub 2^/gallic acid/ horseradish peroxidase (HRP) and the H^sub 2^O^sub 2^/gallic acid acetaldehyde (MeCHO) systems. The ... showing a notable increase from the gallic acid addition, makes the decay of the hydroxyl ...
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Walnuts' anti-aflatoxin ally: Gallic Acid.
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Induction of Hepatic Antioxidant Enzymes by Phenolic Acids in Rats Is Accompanied by Increased Levels of Multidrug Resistance-Associated Protein 3 mRNA Expression1
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; ... Sprague-Dawley rats. Rats were orally administrated gentisic acid (GEA), gallic acid (GA), ferulic acid (FA), and p-coumaric acid (p-CA) at a ... laboratory showed that gentisic acid (GEA), ferulic acid (FA), gallic acid (GA), and p-coumaric acid (p-CA) ...
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