Phenolic acids (phenolcarboxylic acids) are a type of organic compounds. Included in that class are substances containing a phenolic ring and an organic carboxylic acid function (C6-C1 skeleton).
Different categories are made of monohydroxybenzoic acids (paraben, methyl paraben, propyl paraben), dihydroxybenzoic acids (gentisic acid, protocatechuic acid), trihydroxybenzoic acids (gallic acid, phloroglucinol carboxylic acid). This type of phenolic acids (especially gallic acid) is a component of hydrolysable tannins.
Syringic acid, eudesmic acid or salicylic acid are other phenolic acids.
Phenolic acid can be found in many plant species. Their content in dried fruits can be high.
Phenolic acids can be found in mushroom basidiomycetes species.[1] It is also a part of the humic substances, which are the major organic constituents of soil humus.
Many phenolic acids can be found in human urine.[2]
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