Editing Polyphenol (section)

===WBSSH definition===

The White–Bate-Smith–Swain–Haslam (WBSSH) definition<ref name="Haslam_and_Cai">{{cite journal | vauthors = Haslam E, Cai Y | title = Plant polyphenols (vegetable tannins): gallic acid metabolism | journal = Natural Product Reports | volume = 11 | issue = 1 | pages = 41–66 | date = January 1994 | pmid = 15206456 | doi = 10.1039/NP9941100041 }}</ref> characterized structural characteristics common to plant phenolics used in [[Tanning (leather)|tanning]] (i.e., the tannins).<ref>Practical Polyphenolics, Edwin Haslam, 1998, {{ISBN|0-521-46513-3}}</ref>

In terms of properties, the WBSSH describes the polyphenols as follows:
* generally moderately [[water-soluble]] compounds
* with molecular weight of 500–4000 Da
* with >12 phenolic hydroxyl groups
* with 5–7 aromatic rings per 1000 Da
In terms of structures, the WBSSH recognizes two structural family that have these properties:
* proanthocyanidins and its derivatives
* [[gallic acid|galloyl]] and hexahydroxydiphenoyl esters and their derivatives