5 種の腹足綱貝類脂質の比較生化学的研究 : スフィンゴ脂質の長鎖塩基の構造と組成

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  • Comparative Biochemical Studies on Lipids of Five Gastropods (Mollusca) : Structures and Compositions of Long-chain Bases of Sphingolipids
  • 5シュ ノ フクソクコウ カイルイ シシツ ノ ヒカク セイカガクテキ ケンキ

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Long chain bases (LCBs) and fatty acids of sphingolipids of the following five gastropod species, Turbo cornutus (Prosobranchia), Haliotis diversicolor aquatilis (Prosobranchia), Hemifusus ternatanus (Prosobranchia), Aplysia juliana (Opisthobranchia) and Euhadra hickonis (Pulmonata) were analyzed by gas chromatography (GC) and gas chromatography/mass spectrometry (CG/MS). LCBs were analyzed as their trimethylsilyl (TMS) ether derivatives, aldehydes, alcohols, methyl ethers or fatty acid methyl esters, and fatty acids as their methyl esters. Main component of LCB of sphingolipids of Prosobranchia were unsaturated dihydroxy LCB, as diene or triene form, ranging from 16 to 22 in carbon number. Those of Opisthobranchia were branched dihydroxy LCB, as monoene form, ranging from 18 to 19 in carbon number. Those of Pulmonata were branched dihydroxy LCB, as monoene form, from 18 to 19 in carbon number, and branched trihydroxy LCB, ranging from 18 to 19 in carbon number. From these results, relation between evolutional degree and LCB composition of sphingolipids in the class Gastropoda were discussed. In an advanced animals in the class Gastropoda, it was found that LCB composition was simple. For example, Aplysia juliana (Opisthobranchia) and Euhadra hickonis (Pulmonata), which are advanced animals in the class Gastropoda, were mainly consisted of the branched chains dihydroxy bases with carbon number of 19. Main component of fatty acids of sphingolipids of Prosobranchia, Opisthobranchia, and Pulmonata were palmitic acid as non hydroxy acids and 2-hydroxypalmitic acid as hydroxy acid.

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