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It is prepared by disulfonation of benzoic acid followed by hydrolysis of the disulfonate. [3] It is a metabolite of alkylresorcinols, first identified in human urine [4] and can be quantified in urine [5] and plasma, [6] and may be an alternative, equivalent biomarker of whole grain wheat intake. [7]
Dihydroxybenzoic acids (DHBA) are a type of phenolic acids. There are six main compounds, having all the same molecular formula C 7 H 6 O 4. Those are: 2,3-Dihydroxybenzoic acid (2-Pyrocatechuic acid or hypogallic acid) 2,4-Dihydroxybenzoic acid (β-Resorcylic acid) 2,5-Dihydroxybenzoic acid (Gentisic acid) 2,6-Dihydroxybenzoic acid (γ ...
3,5-Dihydroxybenzoic acid (α-resorcylic acid or 5-carboxyresorcinol) 2,4-Dihydroxybenzoic acid (β-resorcylic acid or 4-carboxyresorcinol) 2,6-Dihydroxybenzoic acid (γ-resorcylic acid or 2-carboxyresorcinol) In each case, the hydroxyl groups are meta to each other and thus are m-dihydroxybenzoic acids.
Gentisic acid is a dihydroxybenzoic acid. It is a derivative of benzoic acid and a minor (1%) product of the metabolic break down of aspirin, excreted by the kidneys. [4] It is also found in the African tree Alchornea cordifolia and in wine. [5]
UV visible spectrum of protocatechuic acid. Protocatechuic acid (PCA) is a dihydroxybenzoic acid, a type of phenolic acid. It is a major metabolite of antioxidant polyphenols found in green tea. It has mixed effects on normal and cancer cells in in vitro and in vivo studies. [4] It is produced commercially from vanillin. [5]
There are three structural isomers: 1,2-dihydroxybenzene (the ortho isomer) is commonly known as catechol, 1,3-dihydroxybenzene (the meta isomer) is commonly known as resorcinol, and 1,4-dihydroxybenzene (the para isomer) is commonly known as hydroquinone. [1]
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The systematic name of this enzyme class is 2,3-dihydroxybenzoate:oxygen 3,4-oxidoreductase (decyclizing). Other names in common use include o-pyrocatechuate oxygenase, 2,3-dihydroxybenzoate 1,2-dioxygenase, 2,3-dihydroxybenzoic oxygenase, and 2,3-dihydroxybenzoate oxygenase. This enzyme participates in benzoate degradation via hydroxylation.
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