Abstract

The sterol composition of Dysidea fragilis from the Black Sea is reported. Three groups of sterols, Δ 5, Δ 0 and Δ 5,7, were found. The isolated 5α,8α- epidioxy sterols appeared to be predominantly, if not exclusively, artifacts. The auto-oxidation of native Δ 5,7- sterols to 5α,8α- epidioxy sterols has been investigated. A transformation of dietary Δ 5- sterols to Δ 5,7- sterols has been demonstrated in Dysidea fragilis.

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