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The occurrence and biosynthesis of gamma‐linolenic acid in a blue‐green alga, Spirulina platensis
Author(s) -
Nichols B. W.,
Wood B. J. B.
Publication year - 1968
Publication title -
lipids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.601
H-Index - 120
eISSN - 1558-9307
pISSN - 0024-4201
DOI - 10.1007/bf02530968
Subject(s) - spirulina (dietary supplement) , gamma linolenic acid , blue green algae , lipidology , food science , clinical chemistry , biosynthesis , linolenic acid , chemistry , botany , cyanobacteria , biology , biochemistry , fatty acid , polyunsaturated fatty acid , bacteria , linoleic acid , organic chemistry , enzyme , raw material , genetics
Abstract The acyl‐lipid and fatty acid composition of six blue‐green algae, namely, Spirulina platensis, Myxosarcina chroococcoides, Chlorogloea fritschii, Anabaena cylindrica, Anabaena flos‐aquae, and Mastigocladus laminosus is reported. All contain major proportions of mono‐and digalactosyl diglyceride, sulfoquinovosyl diglyceride, and phosphatidyl glycerol, but none possess lecithin, phophatidyl ethanolamine, or phosphatidyl inositol. Trans‐3‐hexadecenoic acid was absent from all extracts. The analyses provide further evidence that there is no general chemical or physical requirement for any specific fatty acid in photosynthesis. S. platensis is unique among photoautotrophic organisms so far studied, containing major quantities of γ‐linolenic acid (6,9,12‐octadecatrienoic acid). This acid is synthesized by the alga by direct desaturation of linoleic acid and is primarily located in the mono‐ and digalactosyl diglyceride fractions. The possible phylogenetic relationship between S. platensis and other plant forms is discussed.