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The composition of furan fatty acids in the crayfish
Author(s) -
Ishii Kazuo,
Okajima Haruo,
Koyamatsu Tsuyoshi,
Okada Youji,
Watanabe Hiroshi
Publication year - 1988
Publication title -
lipids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.601
H-Index - 120
eISSN - 1558-9307
pISSN - 0024-4201
DOI - 10.1007/bf02535671
Subject(s) - sterol , chemistry , hepatopancreas , furan , polyunsaturated fatty acid , chromatography , fatty acid , composition (language) , organic chemistry , biochemistry , cholesterol , linguistics , philosophy
Capillary gas chromatography‐mass spectrometry (GC‐MS) analysis of the sterol ester fatty acid methyl esters of the crayfish hepatopancreas revealed the presence of at least 30 kinds of unusual furan fatty acids (F acids), which accounted for 28.49% of the total sterol ester fatty acids. On the other hand, only small amounts were found in triacylglycerols (0.5%) and phospholipids (0.7%). Among the F acids, 17 acids were the hitherto unknown ones, the major component being 12,15‐epoxy‐13,14‐dimethyleicosa‐12,14‐dienoic acid (F 6 ) (41.83% of the total F acids). These novel acids possessed chain lengths of C 12 to C 22 , with the largest concentration at C 20 (45.38%), C 18 (41.97%) and C 16 (10.35%). Odd‐numbered F acids also were found, though in a very small amount (0.4%). In the living things other than the crayfish, the longest chain F acid (C 24 ) was detected in the sterol ester of the carp hepatopancreas. The bullfrog, an amphibian, and the turtle, a reptilian, were found to have F acids as well in their livers. Olefinic furan fatty acids, which were detected by GC‐MS, were found to have resulted during the analytical process from cyclodehydration of the diketo‐ene formed by autoxidation of the F acids.