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Flavonoid and naphthoquinone content of different Drosera species analyzed by three methods: HPLC (detected flavonoids: 2″-O-galloyl hyperoside, hyperoside, isoquercetin; quercetin and detected naphthoquinones: 7-methyl juglone, plumbagin) and two European Pharmacopoeia (Ph.Eur. 9.7, 01/2017:1174) content determination methods from the monographs, birch leaves (method A) and hawthorn leaves with flowers (method B); values indicate percentage of dry plant weight.
