New caulerpenyne-derived metabolites of an Elysia sacoglossan from the South Indian coast.
Chemical analysis of the secondary metabolite pattern of the sacoglossan mollusc Elysia cf. expansa, collected along South Indian coasts, showed the presence of the typical Caulerpa-derived sesquiterpene caulerpenyne (1) and two new minor co- occurring metabolites, the compounds dihydrocaulerpenyne (4) and expansinol (5). The chemical characterization of these molecules, structurally related to 1, is reported.
Distribution of the pigment caulerpin in species of the green alga Caulerpa
Abstract The distribution of the pigment caulerpin in the algal genus Caulerpa has been investigated. Specimens from Bermuda, Florida and Tasmania were examined directly and the results compared with literature reports of the occurrence or absence of caulerpin in various species from diverse locations. These surveys revealed a general correlation of the presence of caulerpin with the absence of peroxidase activity and the presence of bilateral rather than radial morphology.
A new γ-dihydropyrone-propionate from the caribbean sacoglossan Tridachia crispata
Abstract A new polypropionate, tridachiahydropyrone ( 3 ), displaying an unprecedented bicyclic γ-dihydropyrone carbon skeleton, has been isolated from the Caribbean sacoglossan molluse Tridachia crispata . The structure and the relative stereochemistry have been determined by spectroscopic methods.