Flavonols belong to the class of flavonoids.
Flavonols are yellow to colorless plant pigments that have antioxidant effects. In the form of glycosides, flavonols occur in the marginal layers of plants. They are found mainly in onions, berries, apples, broccoli, kale, tea and red wine.
Like flavones, flavonols consist of a flavone backbone (2 benzene rings and 1 heterocycle) and hydroxyl residues. In addition, there is a hydroxyl group at position 3 of the benzene rings, which makes the crucial difference to the flavones. Due to the chemical structure, blue light is absorbed and yellow light appears.
The most common flavonols include:
- Fisetin
- Camphorol
- Morin
- Myricetin
- Quercetin
- Rhamnetin