In addition, several structural elements such as o-dihydroxyl catechol structure in the B-ring, the presence of unsaturation and 4-oxo group in the C-ring are also presumed to increase the antioxidant activity of flavonoids.
In addition, severalstructural elements such as o-dihydroxyl catechol structurein the B-ring, the presence of unsaturation and 4-oxogroup in the C-ring are also presumed to increase the antioxidantactivity of flavonoids.