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Lipid components of diatoms

1966; Elsevier BV; Volume: 116; Issue: 2 Linguagem: Inglês

10.1016/0005-2760(66)90009-9

1879-145X

M. Kates, B. E. Volcani,

Aquaculture Nutrition and Growth

1. The total lipids of five species of marine diatoms and one fresh-water diatom were studied chromatographically and the major components identified. All species contained glycerides, sulfoquinovosyl diglyceride, digalactosyl diglyceride, monogalactosyl diglyceride, phosphatidyl glycerol, lecithin, and phosphatidyl inositol as major lipid components. Small to trace amounts of several unidentified sulfur-con-taining lipids, an unidentified glycolipid (sphingolipid?), phosphatidyl ethanolamine, phosphatidyl-N-methylethanolamine, phosphatidic acid, and diphosphatidyl glycerol were also present. In general, the lipid composition of the diatoms resembled that of green algae. 2. Data on 32P-, 14C-, and 35S-incorporation into the diatom lipids are also included in this study. 3. The major fatty acid constituents in the total lipids of the diatoms examined were palmitoleic, palmitic, eicosapentaenoic, and eicosatetraenoic acids ; small amounts of hexadecadienoic, hexadecatrienoic, octadecenoic, octadecadienoic, and octadecatrienoic acids were also present. The latter acid (linolenic acid), which is the major acid in algae and higher plants, was only a minor constituent of the diatom lipids.