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Identification of arachidonic acid in gulf of mexico shrimp and degree of biosynthesis in penaeus setiferus

Identification of arachidonic acid in gulf of mexico shrimp and degree of biosynthesis in penaeus setiferus

Lipids 16(12): 871-875

An icosatetraenoic fatty acid, though to be all cis-5,8,11,14-eicosatetraenoic acid (arachidonic acid), was isolated from shrimp total lipid. The acid was subjected to partial reduction with hydrazine hydrate, with subsequent isolation of the monoenoic reaction products which were cis in structure. These were then cleaved by periodate-permaganate oxidation and the resulting mono- and dicarboxylic acids were converted to methyl esters. Identification of the resulting mono- and dicarboxylic acids indicated that the original icosatetraenoic acid had the all cis-5,8,11,14 pattern of double bonds, and it was thus identified as arachidonic acid. Experiments also were performed to study the synthesis of arachidonic acid 20:4(5,8,11,14) from linoleic acid, 18:2(9,12) in microsomes prepared from shrimp hepatopancreas and tail muscle tissue. Each step to the pathway 18:2(9,12) .fwdarw. 18:3(6,9,12) .fwdarw. 20:3(8,11,14) .fwdarw. 20:4(5,8,11,14) was assayed separately, and the level of activity of each enzyme was expressed as percentage conversion of substrate to product. In each step of the sequence, the enzyme activity in the shrimp tissue was very low compared to the activity found in rats. The arachidonic acid in shrimp tissue probably originates mostly in the diet.

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