Main Page | See live article | Alphabetical index Polyphenols are a group of vegetable chemical substances, characterized by the presence of more than one phenolic group. Their phenolic reactions produce gelatines, alkaloids and other proteins. The polyphenols are responsible for the colouring of some plants. See also: tannins and flavonoids. This article is a stub. You can help Wikipedia by fixing it. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.