Tannin vs. Flavonoid — What's the Difference?
Difference Between Tannin and Flavonoid
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Tannin
Tannins (or tannoids) are a class of astringent, polyphenolic biomolecules that bind to and precipitate proteins and various other organic compounds including amino acids and alkaloids. The term tannin (from Anglo-Norman tanner, from Medieval Latin tannāre, from tannum, oak bark) refers to the use of oak and other bark in tanning animal hides into leather.
Flavonoid
Flavonoids (or bioflavonoids; from the Latin word flavus, meaning yellow, their color in nature) are a class of polyphenolic secondary metabolites found in plants, and thus commonly consumed in the diets of humans.Chemically, flavonoids have the general structure of a 15-carbon skeleton, which consists of two phenyl rings (A and B) and a heterocyclic ring (C, the ring containing the embedded oxygen). This carbon structure can be abbreviated C6-C3-C6.
Tannin
Any of various water-soluble polyphenols found in plant tissues that bind proteins and promote the tanning of leather. Also called tannic acid.
Flavonoid
Any of a large group of water-soluble antioxidant compounds, including the anthocyanins, flavonols, flavones, and isoflavonoids, often occurring as glycosides in plants and consisting of two aromatic rings linked by a carbon bridge that often forms a heterocyclic ring. Flavonoids are found in tea, red wine, and a variety of vegetables and fruits.
Tannin
Any of various other substances that promote the tanning of leather, such as chromium salts.
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Flavonoid
Any of various compounds that are a subset of this group, including the flavones, flavanols, and flavonols, as distinguished from the isoflavonoids. In both senses also called bioflavonoid.
Tannin
(chemistry) Tannic acid or any of its derivatives.
Flavonoid
(organic chemistry) Any of many compounds that are plant metabolites, being formally derived from flavone; they have antioxidant properties, and sometimes contribute to flavor.
Tannin
Same as Tannic acid, under Tannic.
Tannin
Any of various complex phenolic substances of plant origin; used in tanning and in medicine
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