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A New Flavonol Glycoside from Tristemma hirtum (Melastomataceae)
Joseph Nandjou Kenfack,Beaudelaire Kemvoufo Ponou,Jonas Kühlborn,Rémy Bertrand Teponno,Raymond Ngansop Nono,Romuald Tématio Fouedjou,Till Opatz,박희준,Léon Azefack Tapondjou 한국생약학회 2018 Natural Product Sciences Vol.24 No.3
Chemical investigation of the plant Tristemma hirtum P. Beauv (Melastomataceae) resulted to the isolation of a new flavonol glycoside named quercetin-7-O-a-D-arabinofuranoside (1), together with nine known compounds including 3'-hexadecanoyl-2'-(9aZ)-tetradecanoyl-glycerol 1'-O-[b-D-galactopyranosyl-(1'' → 6'')-a-D-galactopyranoside] (2), arjunolic acid (3), b-sitosterol-3-O-b-D-glucopyranoside (4), terminolic acid (5), quercetin (6), asiatic acid (7), maslinic acid (8), 1b-O-galloylpedunculagin (9) and 6-hydroxyapigenin 7-O-b-D-glucopyranoside (10) from the methanol extract using normal and reversed phase column chromatography. The structures of these compounds were determined by comprehensive interpretation of their spectral data mainly including 1D- 2D-NMR (1H-1H COSY, HSQC, and HMBC) spectroscopic and ESI-TOF-MS mass spectro- metric analysis.
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.