منابع مشابه
Multiple Defensive Roles for Bromopyrrole Alkaloids from Caribbean Agelas Sponges
Previous studies have indicated that Caribbean reef sponges of the common genus Agelas are chemically defended from fish predators by brominated pyrrole alkaloids: Agelas clathrodes and A. wiedenmayeri by 4,5-dibromopyrrole-2-carboxylic acid (1) and oroidin (2), A. conifera by sceptrin (3). In this study, we expand our understanding of chemical defense in this sponge genus to include an extensi...
متن کاملConvergent evolution of chemical defense in poison frogs and arthropod prey between Madagascar and the Neotropics.
With few exceptions, aposematically colored poison frogs sequester defensive alkaloids, unchanged, from dietary arthropods. In the Neotropics, myrmicine and formicine ants and the siphonotid millipede Rhinotus purpureus are dietary sources for alkaloids in dendrobatid poison frogs, yet the arthropod sources for Mantella poison frogs in Madagascar remained unknown. We report GC-MS analyses of ex...
متن کاملTwo new isoquinolone Alkaloids from Sauropus hirsutus
Sauropus androgynus (Euphorbiaceae) is a popular vegetable in Thailand. In 1995, the plant was associated with several cases of poisoning when used in a Taiwanese weight control method and the toxicity was attributed to its alkaloid content. We have therefore investigated a closely related Sauropus species, S. hirsutus. Extraction and isolation of chemical constituents from the aerial part of S...
متن کاملTwo new isoquinolone Alkaloids from Sauropus hirsutus
Sauropus androgynus (Euphorbiaceae) is a popular vegetable in Thailand. In 1995, the plant was associated with several cases of poisoning when used in a Taiwanese weight control method and the toxicity was attributed to its alkaloid content. We have therefore investigated a closely related Sauropus species, S. hirsutus. Extraction and isolation of chemical constituents from the aerial part of S...
متن کاملPyrrolizidine alkaloids from Heliotropium transoxanum Bunge
Background and objectives: The plants belonging to the genus Heliotropium L. (Boraginaceae) are the main sources of toxic pyrrolizidine alkaloids (PAs). In the present study, we have investigated the PAs of the aerial parts of Heliotropium transoxanum Bunge, a perennial species native to Iran. Methods: Silica gel column chromatography and silica gel PTLC were applied ...
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ژورنال
عنوان ژورنال: Journal Of The Brazilian Chemical Society
سال: 1996
ISSN: 0103-5053
DOI: 10.5935/0103-5053.19960040