Showing papers on "Biflavonoid published in 1985"
TL;DR: Dihydroquercetin (taxifolin), previously considered as inactive, showed an interesting cromoglycate-like behaviour and the inhibitory potencies of all the compounds used were decreased according to preincubation time.
Abstract: The effect of cromoglycate and of natural flavonoids on histamine release from peritoneal rat mast cells induced by compound 48/80 and ionophore A23187 was studied according to preincubation time of mast cells with drugs and to incubation time of cells with the triggering agent. Preincubation of cells with cromoglycate, dihydroquercetin and amentoflavone, a biflavonoid, decreased the potency of drugs to inhibit the ionophore-induced release; the optimal inhibitions were observed when drugs were added simultaneously with the ionophore A23187. In contrast, a short preincubation (2 min) of cells with quercetin or luteolin decreased their inhibitory effect on the ionophore-induced release, whereas a longer preincubation increased the inhibition. When compound 48/80 was used to trigger histamine secretion, the inhibitory potencies of all the compounds used were decreased according to preincubation time. Dihydroquercetin (taxifolin), previously considered as inactive, showed an interesting cromoglycate-like behaviour.
87 citations
TL;DR: There is evidence of closer links between northern and southern hemisphere genera than would be expected on the basis of the presently recognized subfamilies.
37 citations
TL;DR: A new biflavonoid, jeediflavanone, has been isolated recently from the alcoholic extract of the nut shells of Semecarpus anacardium as discussed by the authors.
31 citations
TL;DR: In this paper, the unique spiro-biflavonoid structure of larixinol (1a) is described and a suggested pathway of biogenesis from dihydrokaempferol is proposed.
Abstract: The unique spiro-biflavonoid structure of larixinol (1a) is described and a suggested pathway of biogenesis from dihydrokaempferol is proposed.
26 citations
TL;DR: From the fronds of Alsophila spinulosa TRYON biflavonoids Hegoflavone A (I) and B (II) were isolated and their structures were elucidated by spectroscopic analysis and chemical degradation.
Abstract: From the fronds of Alsophila spinulosa TRYON biflavonoids Hegoflavone A (I) and B (II) were isolated and their structures were elucidated by spectroscopic analysis and chemical degradation to be 2, 3-dihydro-3'''-hydroxy-6, 6'''-biapigenin (I) and 2, 3-dihydro-6, 6'''-biluteolin (II) respectively These are the first reports of a C-6/C-6'''-linked biflavonoid in nature
16 citations