Day A.J., Mellon F., Barron D., Sarrazin G., Morgan M.R., Williamson G. (2001) Human metabolism of dietary flavonoids: identification of plasma metabolites of quercetin. Free Radic Res 35:941-52 PubMed (21856292)

Compound Mean content
Quercetin 3,4'-O-diglucoside 37.1 mg/200 g fresh weight
Quercetin 3-O-glucoside 0.7 mg/200 g fresh weight
Quercetin 4'-O-glucoside 39.5 mg/200 g fresh weight
Isorhamnetin 4'-O-glucoside 1.8 mg/200 g fresh weight
Quercetin 0.1 mg/200 g fresh weight