東京湾産シャコの脂質組成について

概要

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Recently, abnormally colored squillae, Squilla oratoria, the body color of which are yel-lowish gray instead of purplish brown, are found frequently among the catches in Tokyo Bay. The cause of discoloration seems to be ascribed to the environmental sea water which has been polluted strongly by coastal industries. Some chemical natures and composition of lipid of the discolored squillae were compared with those of normal squillae, and the following results were obtained: 1. Any difference in the lipid content, refractive index of the lipid, and neutralization value of fatty acids could not be observed between the two samples. The lipid of the dis-colored sample, however, showed higher saponification and iodine values and lower content of unsaponifiable matters as compared to those of normal one. 2. Fatty acids in discolored sample contained less amount of C12:0, C14:1, C22:5 and more C18:4(?), C20:2(?), C34:2 fatty acid than the normal, although a further confirmation seems to be necessary. 3. No significant difference in carotenoid content was observed between the tow samples. 4. Lipid in discolored sample contained far less cholesterol than the normal. As regards the content of 7- dehydrocholesterol, however, no significant difference was found between the two samples.
公益社団法人日本水産学会の論文