1. A new coumaronochromone and a new alkanoyl-dihydrofuranoflavone glycoside from Eriosema robustum (Fabaceae).
- Author
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Awouafack, Maurice Ducret, Wong, Chin Piow, Tane, Pierre, and Morita, Hiroyuki
- Abstract
Graphical abstract Highlights • The phytochemicals of a medicinal plant, Eriosema robustum, were re-investigated. • A new coumaronochromone (1) and a new furanoflavone (2) were isolated from the plant. • The structures of 1 and 2 were characterized by NMR and HR-ESIMS. • 1 and 2 exhibited weak activity with MICs > 150 μg/mL against bacteria and fungi. • 1 (IC 50 340.3 ± 0.1 μM) and 2 (IC 50 524.6 ± 0.1 μM) had weak antioxidant activity. Abstract A new coumaronochromone, eriocoumaronochromone (1), and a new alkanoyl-dihydrofuranoflavone glycoside, robusflavone C (2), as well as seven known compounds, 6-prenylpinocembrin (3), desmoxyphyllin A (4), prutin (5), genistein (6), vitexin (7), kaempferol (8), and p -hydroxy benzoic acid (9), were obtained after phytochemical re-investigation of the EtOAc-soluble portion from the EtOH extract of the twigs of Eriosema robustum. The structures of the new compounds were elucidated by analyses of their spectroscopic data (1D- and 2D- NMR, and HR-ESIMS) and chemical conversion. 1 and 2 exhibited weak antioxidant activity with IC 50 340.3 ± 0.1 and 524.6 ± 0.1 μM in 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical assay, and possessed weak antimicrobial activity with MICs > 150 μg/mL against Bacillus subtilis , Staphylococcus aureus , Klebsiella pneumoniae , Escherichia coli, Candida albicans , and Saccharomyces cerevisiae. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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