The composition of the terpenic alcohol and sterol fractions of the unsaponifiables of ten algal species, fiveMyxophyceae and fiveChlorophyceae, is discussed. The major component of the terpenic fraction is phytol, a diterpenic alcohol. Minor amounts of straight chain and triterpenic alcohols are also present. Practically all the species examined contain ten components in the sterol fraction: cholesterol, brassicasterol, Δ5‐ergostenol, poriferasterol, Δ7‐ergostenol, clionasterol, chondrillasterol, Δ5‐avenasterol, Δ7‐chondrillastenol, and an unidentified component. Identification of the sterols was made by gas chromatography‐mass spectrometry, and a 24 S configuration was assumed. The prokaryotic blue‐green algae are characterized by a higher content in cholesterol (3.5–14%) than the eucaryotic green algae (0–2.5). Also, brassicasterol, poriferasterol, clionasterol, and Δ5‐avenasterol are more abundant in blue‐green algae. Δ7‐Ergostenol, chondrillasterol, and Δ7‐chondrillastenol predominate, on the contrary, in green algae.
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Paoletti et al. (1976) studied this question.
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