貝類のΔ^<5,7>-ステロール

This paper presents the compositions of Δ^<5,7>-sterols and other sterols of 2 gastropods and 6 pelecypods. Nine Δ^<5,7>-sterols were detected in these molluscs in addition to the Δ^<5>-sterols commonly occurring in marine molluscs. As the most abundant sterols, the gastropods, Neverita didyma and Tonna luteostoma, contained cholesta-5.7-dienol, whereas the pelecypods, Scapharca broughtonii, Glycymeris vestita, Cyclina sinensis, Metretrix petechialis, Mactra chinensis, and Sinonovacula constricta, involved 24-methylcholesta-5,7,22-trienol and/or cholesta-5,7-dienol. A C26 sterol, 24-norcholesta-5,7,22-trienol, was present in all molluscs examined. N.didyma and M.chinensis contained 24-methylenecholesta-5,7-dienol and (24Z)-24-ethylidenecholesta-5,7-dienol. 24-Methylenecholesta-5,7-dienol was also detected in T.luteostoma