title: A benzoquinone and flavonoids from Cyperus alopecuroides.
abstract: A benzoquinone, named alopecuquinone, was isolated from the ethanol extract of the inflorescences of Cyperus alopecuroides. Its structure was primarily elucidated by spectroscopic analysis including 1H, 13C NMR, APT, HMQC, 1H-1H COSY and CIMS. The known flavonoids, vicenin 2, orientin, diosmetin, quercetin 3,3'-dimethyl ether and its 3,4'-dimethyl ether, were also isolated and characterized. The ethanol extract of the plant material showed moderate estrogenic activity using a strain of Saccharomyces cerevisiae.
authors.affiliation: Chemistry of Natural and Microbial Products Department, National Research Centre, Dokki, Cairo, Egypt. mnasser_eg@yahoo.com
authors.forename: Mahmoud I
authors.initials: MI
authors.lastname: Nassar
authors.forename: Ayman F
authors.initials: AF
authors.lastname: Abdel-Razik
authors.forename: Ezz El-Din A M
authors.initials: Eel-D
authors.lastname: El-Khrisy
authors.forename: Abdel-Aziz M
authors.initials: AA
authors.lastname: Dawidar
authors.forename: Amy
authors.initials: A
authors.lastname: Bystrom
authors.forename: Tom J
authors.initials: TJ
authors.lastname: Mabry
mesh_terms: D016227:Benzoquinones / Q000737:chemistry* / Q000302:isolation & purification* / Q000494:pharmacology; D029786:Cyperus / Q000737:chemistry*; D004534:Egypt; D004968:Estrogens, Non-Steroidal / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D005419:Flavonoids / Q000737:chemistry* / Q000302:isolation & purification* / Q000494:pharmacology; D005696:Galactosidases / Q000378:metabolism; D006801:Humans; D007529:Isoflavones; D019684:Magnoliopsida / Q000737:chemistry*; D013058:Mass Spectrometry / Q000379:methods; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods; D009822:Oils, Volatile / Q000032:analysis / Q000737:chemistry; D048789:Phytoestrogens; D010936:Plant Extracts; D028321:Plant Preparations; D010946:Plants, Medicinal; D010957:Plasmids / Q000096:biosynthesis / Q000378:metabolism; D011960:Receptors, Estrogen / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000187:drug effects / Q000201:enzymology; D013056:Spectrophotometry, Ultraviolet
chemical_list: D016227:Benzoquinones; D004968:Estrogens, Non-Steroidal; D005419:Flavonoids; D007529:Isoflavones; D009822:Oils, Volatile; D048789:Phytoestrogens; D010936:Plant Extracts; D028321:Plant Preparations; D011960:Receptors, Estrogen; C004532:quinone; D005696:Galactosidases