海洋性イルカ胃内容物中の高級分枝鎖脂肪酸について

• Main Author: 森井 秀昭
• Format: Report
• Language: Japanese
• Published: 長崎大学水産学部 1979
• Subjects: toothed whale; toothed whales
• Online Access: http://hdl.handle.net/10069/30620; https://nagasaki-u.repo.nii.ac.jp/?action=repository_uri&item_id=9938; https://nagasaki-u.repo.nii.ac.jp/?action=repository_action_common_download&item_id=9938&item_no=1&attribute_id=18&file_no=1

In order to ascertain whether or not long-chain branched fatty acids of oil of the marine little toothed whale originate in the lipid of microorganisms in the stomach of the animal, the composition of long-chain fatty acids in the food part, bacterial part and free oil part of the stomach content was studied with three living animals where bacteria was either isolated or unisolated from the stomach. The results obtained are as follows. 1) The iso and anteiso fatty acids were recognized in all the parts of the stomach contents, but the quantity was little in all the parts, especially in the bacterial part. 2) The composition of iso fatty acids in the bacterial part isolated from the stomach was somewhat different from that in the food part, but it was not similar to that in the whale's oil. 3) The composition of anteiso fatty acid in the bacterial part was similar to that in the food part, and accordingly it was not similar to that in the whale's oil. 4) The composition of fatty acid in the free oil part in the stomach with digesting content was peculiar : The iso, anteiso and straight-chain fatty acid with the carbon number under 13 were relatively abundant, and there were detected more saturated fatty acid less monoene and polyene fatty acids as compared with that in the food part and the bacterial part. 3頭の生体イルカ(胃内から細菌が分離されたものとされないものがあった)について,その胃内容物を食物部,菌体部および遊離油脂部に分け,この各脂質中に含まれる高級脂肪酸組成を検索し,次の結果を得た。1.供試イルカのいずれの胃内容区分にもisoおよびanteiso酸を認めたが,量的にはどれも少なく,菌体部ではとくに少なかった。2.胃内から細菌が分離された菌体部のiso酸組成は食物部の組成と多少異なったが,この菌体部のiso酸組成はイルカ油脂中の組成とは類似しなかった。3.菌体部のanteiso酸組成は食物部の組成とほぼ類似し,したがってイルカ油脂中の組成とは類似しなかった。4.消化の進んでいない胃内に遊離の状態で存在していた油脂中の脂肪酸組成は特異的で,すなわち炭素数13以下のiso酸,anteiso酸,直鎖酸を比較的多く含み,また食物部や菌体部に比し飽和酸が多くモノエン酸,ポリエン酸が少なかった。