نتایج جستجو برای: isolation and structure elucidation
تعداد نتایج: 16988364 فیلتر نتایج به سال:
N. fasciculare is a poisonous mushroom widely distributed in northeast part of Japan (Japanese name: Nigakuritake). Phytochemical investigation of this mushroom revealed some biologically active compounds which include new lanostane-type triterpenoids, fasciculols A-F [1 – 3]. In addition, N. fasciculare, when grown in liquid culture, produced a complex mixture of sesquiterpene metabolites of a...
A fermentation broth of an unidentified fungus (N983-46) was found to produce DNAgyrase inhibitors, CJ-12,371 (1) and CJ-12,372 (2). Following isolation by solvent extraction and silica gel and ODS(reverse phase) chromatographies, the structures were determined to be novel spiro-ketal compounds with S-connguration at position C-l. CJ-12,371 and CJ-12,372 inhibit both DNA supercoiling and relaxa...
cosphingolipids from starfish, we have isolated cerebrosides, ceramide-lactosides, sulfatides, and gangliosides having some biological activities. As a continuation of our previous studies, we recently carried out the isolation and structure elucidation of a disialo-ganglioside molecular species, LLG-3, i.e., 8-O-Me-NeuAca2→11NeuGca2→3Galb1→ 4Glcb1→1ceramides, from the starfish Linckia laevigat...
abstract because of the many geopolitical, geo economical and geo strategically potentials and communicational capabilities of eco region, members can expand the convergence and the integration in base of this organization that have important impact on members development and expanding peace in international and regional level. based on quality analyzing of library findings and experts interv...
The present work deals with the isolation and structure elucidation of new flavones from methanol extract of Avicennia alba aerial parts. Isolation of the compound was carried out by chromatographic techniques, followed by different spectral analytical methods. The spectral data of UV-Vis, FT-IR, 1H NMR, 13C NMR and GC-MS of the isolated compound is in support of presence of flavone nucleus. Th...
Phytochemical survey of stems and leaves of the South Brazilian endemic Raulinoa echinata Cowan, Rutaceae led to the isolation of five limonoid derivatives: the widespread limonin, limonexic acid, kihadalactone B, a methoxylated limonexic acid derivative and a degraded limonoid structurally related to fraxinellone. The two latter compounds have been isolated for the first time. These compounds ...
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