Content of individual flavonoid aglycones washed from <i>Betula pendula</i> leaves surface.

a Numbers of peaks correspond with chromatographic profile in supplementary material. b For tetrahydroxyflavone—OH-groups in positions 5, 7, 3' и 4'. For pentahydroxyflavone—OH-groups in positions 5, 7, 3', 4' и 5'. c Peaks of compound 9 and 10 are not separated, ratio of the compounds 9 and 10 determined by the HPLC/MS and is ~ 20:1. Flavonoid aglycones of sample Nr 3 were also quantified using a UV- spectrophotometer (Cary 5000, Varian), using apigenin (Sigma-Aldrich) as the standard. Content of individual flavonoid aglycones washed from Betula pendula leaves surface.