Abstract
A new C-glycosylflavone, drymaritin E (6-C-(3-keto-β-digitoxopyranosyl)-4′-O-(β-d-glucopyranosyl)-7-methoxyl-5,4′-dihydroxylflavone) 1 was isolated from the oily upper phase (SU) of the MeOH extract from aerial parts of Drymaria cordata together with two known compounds (cassiaoccidentalin A 2 and anemonin 3) and an inseparable mixture of two known C-glycosylflavones 5,4′-dihydroxy-7-methoxyflavone-6-C-(2′′-O-α-l-rhamnopyranosyl)-β-d-glucopyranoside 4a and 5,7,3′,4′-tetrahydroxyflavone-6-C-(2′′-O-α-l-rhamnopyranosyl)-β-d-glucopyranoside 4b. The alkaline hydrolysis of 3 led to a new hemisynthetic derivative, sodium anemonate (sodium 2-((1’E) 2′-sodium-carboxylate-vinyl)-5-oxo-cyclohex-1-ene carboxylate) 3a. The chemical structures were determined by spectroscopic methods (1H NMR, 13C NMR, 1H-1H COSY, HMBC, HSQC, and NOESY) and mass spectrometry (ESI–MS). C-glycosylflavones had significant free radical-scavenging activities on the radical 2,2-diphenyl-1-picrylhydrazyl (DPPH). However, SU and compounds 3 and 3a exhibited no activity. In particular, compound 1 exhibited a concentration-dependent radical scavenging activity on DPPH with EC50 of 31.43 µg/mL.
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Acknowledgments
This research work was supported by the IFS (International Foundation for Science, Stockholm, Sweden) program through a grant to Prof. A. Léon TAPONDJOU (RGA No. F/3976-3F) and the Italian Ministry of Education (MIUR) (COOPERLINK 2011 Prot. CII113PPUC).
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Nono, R.N., Nguelefack-Mbuyo, E.P., Nzowa, L.K. et al. Antioxidant C-glycosylflavones of Drymaria cordata (Linn.) Willd. Arch. Pharm. Res. 39, 43–50 (2016). https://doi.org/10.1007/s12272-015-0691-7
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DOI: https://doi.org/10.1007/s12272-015-0691-7