Abstract
Lipid analyses of four species of marine unicellular prymnesiophyte algae of the genus Pavlova have shown that each contains significant amounts of 4α-methyl sterols, the major one being the C 30 sterol 4α-methyl-24-ethyl-5α-cholest-22E-en-3gb-ol. This sterol has a similar structure to dinosterol, which occurs in dinoflagellates, except that the side-chain contains a 24-ethyl group rather than 23,24-dimethyl substitution. Other 4-methyl sterols include 4α,24-dimethyl-5α-cholest-22E-en-3β-ol, 4α,24-dimethyl-5α-cholestan-3β-ol and 4α-methyl-24-ethyl-5α-cholestan-3β-ol. The major 4-dimethyl sterol in each of the species is 24-ethylcholesta-5,22E-dien-3β-ol. Two species also contain significant amounts of the 5α(H)-stanol 24-ethyl-5α-cholest-22E-en-3β-ol. Unusual hydroxylated compounds found in each species were tentatively identified as dihydroxylated 4-methylsteranes. Species of Pavlova are common in marine and brackish water environments and so might be important sources of 4-methyl and 4-desmethyl stenols and stanols in some sediments.
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