Flavonoid antioxidant activity

Flavonoids are a diverse, plant-derived group of polyphenols with potent antioxidant properties due to their ability to scavenge free radicals, chelate metal ions, and modulate cellular oxidative stress pathways[1][2][3][4][5]. Their antioxidant efficacy is highly dependent on their chemical structure, particularly the number and position of hydroxyl and glycosyl groups[1][2][4]. Flavonoid antioxidant activity protects cells from oxidative damage, reduces the risk of cardiovascular and certain chronic diseases, and contributes to anti-inflammatory and chemopreventive effects[1][2][3][5]. However, "flavonoid antioxidant activity" is an umbrella term; it does not denote a single therapeutic target, and should not be listed as a molecule, receptor, or target in structured databases.

Free radical scavenging via hydrogen atom and electron donation; Chelation of transition metals (e.g., iron), inhibiting radical generation; Modulation of gene expression for antioxidant enzymes