An ethanolic extract of Drosera madagascariensis inhibited human neutrophil elastase with an IC50 of 9.4 microg/ml. The naphthoquinones present in the extract were not responsible for this effect, but flavonoids like quercetin (IC50 0.8 microg/ml), hyperoside (IC50 0.15 microg/ml) and isoquercitrin
In investigations of the anti-inflammatory and spasmolytic effects of Drosera rotundifolia two extracts were tested in different in vitro assays. An aqueous and an ethanolic extract inhibited human neutrophil elastase, achieving IC50 values of 5 and 1 microg/mL, respectively. The very low
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