Content of individual flavonoid aglycones washed from Betula pendula 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.

a. 色谱峰的数量与补充材料中的色谱图谱一致。
b. 四羟基黄酮（tetrahydroxyflavone）的羟基（-OH基团）位于5、7、3'及4'位；五羟基黄酮（pentahydroxyflavone）的羟基位于5、7、3'、4'及5'位。
c. 化合物9与10的色谱峰未实现基线分离，二者的含量比例经高效液相色谱-质谱联用法（HPLC/MS）测定约为20:1。
编号为3的样品中的黄酮苷元亦可采用紫外分光光度计（Cary 5000, Varian）进行定量分析，以芹菜素（apigenin, Sigma-Aldrich）作为定量标准品。
本数据集核心内容为从垂枝桦（Betula pendula）叶片表面洗脱得到的各单体黄酮苷元的含量。