Total Phenolic Compounds
Most phenolic compounds belong to the flavonoids. Lignin, the primary substance of wood, is the most common member of this group. Phenolic compounds can be found in wine; it is partly responsible for the color, astringency, and bitterness. They can also be found in grapes, flaxseed, pine tree, olive, and other plants. Examples of phenolic compounds are hydroxybenzoic and hydroxycinnamic acids, stilbenes, flavones, flavonols, flavanonols, flavanols, and anthocyanins. Phenolic acid is also known as phenol.
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