ZfN: Search Results

1	Author	JohnL. Ingham, SatoshiT. Ah, O. Rn	Requires cookie*
	Title	Fungitoxic Isoflavones from Lupinus albus and other Lupinus Species
	Abstract	The constitutive isoflavones genistein, 2'-hydroxygenistein, wighteone and luteone have been isolated in varying amounts from methanolic leaf washings of eight species belonging to the legume genus Lupinus. These four compounds likewise occur in the flower buds, stems, roots and im mature pods o f L. albus, and in stems and roots o f L. angustifolius and L. mutabilis. A m inor isoflavone present in L. albus and L. luteus leaf washings has been identified by chemical and spectroscopic procedures as 5,7,4'-trihydroxy-3-methoxy-6-(3,3-dimethylallyl)isoflavone (lupiso-flavone). Apart from genistein, 2'-hydroxygenistein, wighteone and luteone, the roots of L. albus also contain alpinumisoflavone, licoisoflavone B and 6,3'-di-(3,3-dimethylallyl)genistein (lupalbi-genin).
	Reference	Z. Naturforsch. 38c, 194—200 (1983); received N ovem ber 3 1982
	Published	1983
	Keywords	Leguminosae, Papilionoideae, Lupinus, Lupins, Isoflavonoids, Isoflavones, Phenolic Compounds, Antifungal Activity
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	TEI-XML for	default:Reihe_C/38/ZNC-1983-38c-0194.pdf
	Identifier	ZNC-1983-38c-0194
	Volume	38

2	Author	Maurice Jay, Vincenzo De Luca, Ragai Ibrahim	Requires cookie*
	Title	Meta-Methylation o f Flavonol Rings A (8-) and B (3'-) Is Catalysed by Two Distinct O-Methyltransferases in Lotus corniculatus
	Abstract	Two O-methyltransferases specific for flavonol rings A and B were isolated from young flower buds of Lotus corniculatus. They were partially purified by ammonium sulphate precipitation and successive chromatography on Sephadex G-100 and Polybuffer ion exchanger. One enzyme focused at pi 5.5 and catalysed the O-methylation of position 8 of flavonols with a pH optimum of 8.1. The other enzyme had a pi o f 5.1 and preferentially attacked position 3' at an optimum pH of 7.7. The methylated products o f both enzymes seem to contribute to the flower colour of Lotus and may be used as biochemical markers in genetic studies of this genus.
	Reference	Z. Naturforsch. 38c, 413 (1983); received December 21 1982
	Published	1983
	Keywords	Lotus corniculatus, Leguminosae, O-Methyltransferase, Flavonols, 8-O-Methylation, 3'-0-Methylation
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	TEI-XML for	default:Reihe_C/38/ZNC-1983-38c-0413.pdf
	Identifier	ZNC-1983-38c-0413
	Volume	38