The composition of total flavonoids from leaves of Ziziphus jujuba Mill. was qualitatively investigated and quantitatively determined. Rutin was found to be the dominant flavonoid from leaves of Z. jujuba. A method based on differential spectrophotometry was proposed for quantitative determination of total flavonoids from jujube leaves recalculated as rutin. Triple extraction of raw material by EtOH (40%) was found to be optimal for extracting the sum of flavonoids from jujube leaves. The total flavonoid contents in jujube leaves as determined by the proposed technique ranged from 1.07 ± 0.025% to 1.32 ± 0.03%.

中文翻译：

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枣叶中的黄酮

枣树叶片中总黄酮的组成。定性研究并定量确定。发现芦丁是枣叶片中的优势黄酮。提出了一种基于差示分光光度法的方法，用于定量测定重新计算为芦丁的枣叶中总黄酮的含量。发现用乙醇（40％）三次萃取原料对于从枣叶中提取总黄酮是最佳的。通过提议的技术测定，枣叶中的总黄酮含量为1.07±0.025％至1.32±0.03％。