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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 ...
Gentisic acid is produced by carboxylation of hydroquinone. [6] C 6 H 4 (OH) 2 + CO 2 → C 6 H 3 (CO 2 H)(OH) 2. This conversion is an example of a Kolbe–Schmitt reaction. Alternatively the compound can be synthesized from salicylic acid via Elbs persulfate oxidation. [7] [8]
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]
3-Hydroxybenzoic acid is a component of castoreum, the exudate from the castor sacs of the mature North American beaver (Castor canadensis) and the European beaver (Castor fiber), used in perfumery. It can also be formed by a Pseudomonas species from 3-Chlorobenzoic acid. [2] 3-Hydroxybenzoic Acid can be found in the pineapple fruit as well.
2,3-Dihydroxybenzoic acid is a natural phenol found in Phyllanthus acidus [2] and in the aquatic fern Salvinia molesta. [3] It is also abundant in the fruits of Flacourtia inermis. It is a dihydroxybenzoic acid, a type of organic compound. The colorless solid occurs naturally, being formed via the shikimate pathway.
2,4-Dihydroxybenzoic acid (β-resorcylic acid) is a dihydroxybenzoic acid. As a resorcylic acid, it is one of the three isomeric crystalline acids that are both carboxyl derivatives of resorcinol and dihydroxy derivatives of benzoic acid. [4] Synthesis from resorcinol is via the Kolbe-Schmitt reaction. [5]
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