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Antioxidant C-glycosylflavones of Drymaria cordata (Linn.) Willd
Raymond N. Nono,Laurence K. Nzowa,Beaudelaire K. Ponou,Re´my B. Teponno,Te´lesphore B. Nguelefack,Luciano Barboni,Le´on A. Tapondjou,박희준 대한약학회 2016 Archives of Pharmacal Research Vol.39 No.1
A new C-glycosylflavone, drymaritin E (6-C- (3-keto-b-digitoxopyranosyl)-40-O-(b-D-glucopyranosyl)- 7-methoxyl-5,40-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 5,40- dihydroxy-7-methoxyflavone-6-C-(200-O-a-L-rhamnopyranosyl)- b-D-glucopyranoside 4a and 5,7,30,40-tetrahydroxyflavone- 6-C-(200-O-a-L-rhamnopyranosyl)-b-D-glucopyranoside 4b. The alkaline hydrolysis of 3 led to a new hemisynthetic derivative, sodium anemonate (sodium 2-((1’E) 20-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 lg/mL.
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