Apigenin structure

FIGURE 13.4 Typical structures for main classes of flavonoids naringin chalcone, 4,6,4 -trihydroxyaurone, apigenin (flavone), and pelargonidin (anthocyanidin). 

Picroni, A. and Pachaly, P., Isolation and structure elucidation of ligustroflavone, a new apigenin triglycoside from the leaves of Ligustrum vulgare L., Pharmazie, 55, 78, 2000. 

Series of cassiaoccidentalins built on a 6-C-(6-deoxy-ribo-hexos-3-ulosyl)flavone general structure, and isolated from Cassia — cassiaoccidentalin A 6-C-glycosyl 2 -0-rhamnosyl)apigenin B 6-C-glycosyl (2"-0-rhamnosyl)luteolin and C 6-C-glycosyl (2"-0-rhamnosyl)diosmetin. 

Flavones are structurally very similar to flavonols and differ only in the absence of hydroxylation at the 3-position on the C-ring. Flavones are mainly represented in the diet by apigenin and luteolin. Unlike flavonols, they are not widely distributed with significant concentrations being reported in only celery (Apium graveolens), parsley (Petroselinum crispum), and artichoke (Cynara scolymus) [Crozier et al., 2006a]. As a consequence their dietary intake... 

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