stemona/antibiotik

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Antibacterial constituents from Stemona sessilifolia.

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Bioassay-guided fractionation led to the isolation of eight compounds from Stemona sessilifolia. Of the eight isolates, three new bibenzyls, stilbostemins M-O (1-3), and a new tocopherol, 6-methoxy-3,4-dehydro-delta-tocopherol (4) were revealed together with four known compounds

Antibacterial stilbenoids from the roots of Stemona tuberosa.

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Twelve dihydrostilbenes, stilbostemins N-Y (1-12), and a phenanthraquinone, stemanthraquinone (13), were isolated and identified from roots of Stemona tuberosa, along with five known dihydrostilbenes. Their structures were established on the basis of 1D and 2D NMR and other spectroscopic analyses.

Phytochemical studies on Stemona aphylla: isolation of a new stemofoline alkaloid and six new stemofurans.

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A new stemofoline alkaloid, (2'S)-hydroxy-(11S,12R)-dihydrostemofoline (3), new stemofurans M-R (8-13), and known compounds stemofoline (1), (2'S)-hydroxystemofoline (2), stemofuran E (4), stemofuran F (5), stemofuran J (6), and stilbostemin F (7) have been isolated from the root extracts of Stemona

Stilbenoids from Stemona japonica.

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Three new dihydrostilbenes, stilbostemins J-L (1-3), and a new dihydrophenanthrene, stemanthrene F (4), were isolated from the roots of Stemona japonica together with two known bibenzyls, 3,5-dihydroxy-4-methylbibenzyl (5) and 3,5-dihydroxy-2'-methoxy-4-methylbibenzyl (6). Their structures were

Phytochemical investigations of Stemona curtisii and synthetic studies on stemocurtisine alkaloids.

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The isolation of two new Stemona alkaloids, 1-hydroxyprotostemonine and stemocurtisine N-oxide, and a new benzofuran, stemofuran L, from the root extracts of Stemona curtisii is reported. The major known alkaloids from this plant extract, stemocurtisine, stemocurtisinol, and oxyprotostemonine, were

[Isolation, classification and biosynthetic potential of endophytic actinomycetes from Stemona].

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OBJECTIVE To isolate endophytic actinomycetes from earthnut samples of Stemona tuberosa Lour. collected from Xishuangbanna, Yunnan Province, and to study the classification, antimicrobial activity and secondary metabolic potential of the isolates. METHODS Samples were treated by a well-established

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