Abstract

1. 1. The bivalve molluscs Cerastoderma edula, Chlamys opercularis, Ensis soliqua, Modiolus modiolus, Mya arenaria, Mytilus edulis and Pecten maximus contained mixtures of C 26-, C 27-, C 28- and C 29-sterols. Cholesterol, 24-methylcholesta-5,22-dien-3β-ol and 24-methylene-cholesterol were the major sterols. 2. 2. The sterols of Cerastoderma edula, Mya arenaria and Mytilus edulis contained 6–16% of cholesta-5,24-dien-3β-ol. 3. 3. All the molluscs contained Δ 5,7-sterols in amounts ranging from 2 to 21% of the total sterols. 4. 4. Cholesta-5,7-dien-3β-ol and 24-methylcholesta-5,7,22-trien-3β-ol were identified in Mytilus edulis. 25-Norcholesta-5,7,22-trien-3β-ol was detected in Modiolus modiolus.

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