f these flavonoid and related compounds are given in Chapter 1.Flavonoids and cinnamic acids are known as primary antioxidants and act as freeradical acceptors and chain breakers. Flavonols are known to chelate metal ions at the 3-hydroxy-4-keto group and/or 5-hydroxy-4-keto group (when the A-ring is hydroxylatedat the fifth position). An o-quinol group at the B-ring can also demonstrate metalchelating activity
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