Non‐methylene‐interrupted and ω4 dienoic fatty acids of the white shrimpPenaeus setiferus

Abstract
The total lipid fatty acids from the white shrimpPenaeus setiferus were found to contain several unusual dienoic fatty acid species. These included two methylene‐interrupted species: Δ11, 14‐C18∶2 (18∶2ω4) and δ13, 16‐C20∶2 (20∶2ω4). Also found were several non‐methylene‐interrupted dienoic fatty acids including δ7, 11 and Δ7, 13‐C20∶2, Δ7, 13‐C21∶2, Δ7, 13, Δ7, 15, Δ9, 13, Δ9, 15, and Δ7, 17‐C22∶2. Many minor C20∶2 non‐methylene‐interrupted dienes were found but could not be unequivocally characterized.