Bulbine Frutescens Folia
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چکیده
Characteristic features are: the leaf in T/S shows an epidermis of colourless, thickwalled, non-suberised cells, a band of photosynthetic and vascular tissue around the leaf perimeter (2+3), a central core of large thin-walled cells with contents staining pink-orange with KOH solution; yellow-green stomata and idioblasts containing bundles of calcium oxalate raphides (1), each up to 200μ long, in cells of the outer leaf perimeter; the absence of tannins.
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Joziknipholones A and B: the first dimeric phenylanthraquinones, from the roots of Bulbine frutescens.
From the roots of the African plant Bulbine frutescens (Asphodelaceae), two unprecedented novel dimeric phenylanthraquinones, named joziknipholones A and B, possessing axial and centrochirality, were isolated, together with six known compounds. Structural elucidation of the new metabolites was achieved by spectroscopic and chiroptical methods, by reductive cleavage of the central bond between t...
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