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Lipid labeling with 32 P‐orthophosphate and 14 C‐acetate in marine copepods
Author(s) -
Farkas Tibor,
Nevenzel Judd C.,
Benson A. A.
Publication year - 1973
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/bf02531840
Subject(s) - sphingomyelin , ethanolamine , lipidology , wax , polyunsaturated fatty acid , biochemistry , chemistry , fatty acid , lipid metabolism , crustacean , incubation , food science , chromatography , biology , cholesterol , ecology
Freshly collected Calanus pacificus were maintained in sea water containing 25 μCi/ml [ 32 P]orthophosphate or 1 μCi/ml [ 14 C]acetate at 10 C for 24 hr. The animals took up label from the environment and incorporated it into various lipid fractions. After incubation with [ 14 C]acetate the order of specific activity of the different lipid classes was: phospholipids > free fatty acids > wax esters > triglycerides. Argentation thin layer chromatography of the fatty acid methyl esters showed that ca. 50% of the activity was in saturated fatty acids and 34% in polyunsaturated acids. When the animals were exposed to [ 32 P]orthophosphate, lysophosphatidyl choline became most heavily labeled, followed by lysophosphatidyl ethanolamine, sphingomyelin, phosphatidyl ethanolamine, and phosphatidyl choline. Comparison of the data obtained with those available for decapods and mammals revealed striking similarities between these phylogenetically distant groups. It is believed that labeling the lipids of marine and freshwater planktonic crustaceans in this way will provide much information about the metabolism of lipids in these organisms.