part_of part of part of flavonoid content Flavonoids are water soluble polyphenolic molecules containing 15 carbon atoms. Flavonoids belong to the polyphenol family and have antioxidant activity. plant_trait_ontology TO:0000290 A polyphenol content trait (TO:0001172) which is the amount of flavonoid (CHEBI:47916) in a plant structure (PO:0009011). CHEBI:47916 antioxidant activity trait polyphenol compound content