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Sterol composition and biosynthesis in the Black ea sponge Dysidea fragilis

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

Sterol composition; Dsidea fragilis

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