MARINE STEROLS .8. STEROL COMPOSITIONS OF 2 MARINE SPONGES - OCCURRENCE OF NEW C26 AND C30 STANOLS IN AN OCEANIC SPONGE

1. 1. The sterol compositions of one oceanic and one coastal species of sponge have been analysed by combined GC-MS techniques. 2. 2. The oceanic sponge contained a complex sterol profile in which a very high proportion of the constituents were 5α-stanol derivatives. New C26 and C30 saturated stanols containing a 5α-cholestanol nucleus were found to be present. Sterols with nuclear unsaturation were confined almost exclusively to Δ5 compounds. 3. 3. The coastal sponge also contained 5α-stanols but nuclear unsaturation predominated with Δ7 sterols being present exclusively. © 1979.