ウニ脂質中のエイコサジエン酸位置異性体の構造

概要

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The double bond positions in the isomeric eicosadienoates from the lipid of a sea urchin species, Anthocidaris crassispina, were determined, were determined by means of mass spectrometry, periodate-permanganate oxidation, alkaline isomerization, GLC analysis on capillary column and hydrazine partial reduction followed by periodate-permanganate oxidation. It was found that two isomers containing non-methylene interrupted double bonds exist in sea-urchin lipid. One of the isomers yielded mainly nonanoic and suberic acids on oxidative cleavage, and gave no characteristic absorption of conjugated dienes in the UV region after alkaline isomerization. These results indicate that the isomer is a hitherto unknown acid, i.e., 3, 11-eicosadienoic acid. The other isomer was characterized as 5, 11-eicosadienoic acid which is rarely demonstrated in marine organisms. It produced nonanoic, glutaric and adipic acids on direct oxidative cleavage and nonanoic, pentadecanoic, glutaric and undecanedioic acids on oxidative cleavage of its partial reduction products.
公益社団法人日本水産学会の論文