Abstract
Sterile artificial sea water containing trace amounts of naturally occurring lipids was subjected to solar levels of ultraviolet radiation. Unconjugated linoleic acid developed increased absorption at 234 nm, indicating diene conjugation. Unconjugated linolenic acid after irradiation absorbed more strongly at 234 and 269 nm, this result indicating diene and triene conjugation, respectively. Some formation of particulate material was noted after several hours of irradiation of either lipid, the particles being retained on a filter of 0.8-μ pore size. Oleic acid showed no significant change in its absorption spectrum and no development of filterable particles. A lipid extract of the marine diatom Thalassiosira fluviatilis was also indicated to undergo diene conjugation. Linoleic acid, linolenic acid, and the plankton lipid extract developed increased absorption at wavelengths longer than 300 nm; thus it was indicated that the photochemical reaction products absorb solar ultraviolet radiation more intensely than the lipid substrates.
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