Flavonoid C-glycosides in Citrus juices from Southern Italy: distribution and influence on the antioxidant activity

Flavonoid C-glycosides are key constituents of the flavonoid fraction of Citrus juices. By drawing on the results presented over the past few years by our research group, a survey on the presence of these derivatives in the juices from eleven different Citrus species cultivated in Southern Italy shows that, so far, 12 individual derivatives have been identified and quantified, in variable amounts ranging from traces to 30–60 mg/L in the richer juices (C. sinensis, C. bergamia and C. medica). In addition, and in-depth study on C. reticulata × C. paradisi juice led to a critical analysis of the role these flavone derivatives play in the antioxidant activity of fresh Citrus juices.