Content and Composition of Diacyl Glyceryl Ethers in the Pyloric Ceca and Ovaries of the Asteroids <i>Solaster paxillatus</i> and <i>Asterias amurensis</i>

Abstract

The content and composition of diacyl glyceryl ethers (DAGE) of the pyloric cecal and ovarian lipids of the asteroids Solaster paxillatus and Asterias amurensis were investigated.In both species, the pyloric cecal lipids contained a relatively high percentage of DAGE. On the other hand, the ovarian lipids of S. paxillatus had an abundance of these compounds but were rela tively low percentages in A. amurensis. The unsaponifiable matter isolated from the tissue neutral lipids consisted of remarkably high levels of glyceryl ethers and small amounts of alkenyl types. Among the different tissues examined, glyceryl ethers originated from DAGE were in general similar in composi tion; the most predominant component was 18:0 alcohol followed by 20:1 and 16:0 alcohols. The fatty acid compositions of DAGE and/or triglyceride classes of the different tissue lipids of the above two asteroid species were also discussed.

The occurrence and possible significance of diacylglyceryl ether lipids in abalone

“…High proportions of 16:0 and octadec-9-enyglyceryl ether [18:1n-9c] were also found in the deep sea squid, Moroteuthis robusta (27). Furthermore, the ovaries of two asteroids were reported to contain 18:0, 20:1, and 16:0 as predominant DAGE diol components (28). The reasons for the difference between tissues in alkyl chain profiles are unknown, however these findings may provide insight to diet of and biosynthetic pathways in H. fulgens.…”

Amount and Composition of Diacyl Glyceryl Ethers in Various Tissue Lipids of the Deep-sea Squid Berryteuthis magister.

“…And the component glyceryl ethers, consisting mainly of 16:0 alcohol in the liver (70.2%) and mantle (69.9%) of the B. magister examined, agreed with those in liver (58.5 68.6%) of the deep-sea squid G. makko (9,14) and in mantle (66.2%) of G. borealis (13), respectively. This characteristic was much different from those in the livers of ratfish (4,5) and sharks (6)(7)(8), being rich in 18:1 alcohol (43 .7 65.3%), and those in the pyloric cecal and ovarian lipids of starfish (16), being rich in 18:0 alcohol (32.9…”

“…In order to develop new potential marine, medical and cosmetic resources, we previouly showed the amounts and characteristics of glyceryl ethers in DAGE that predominated in the flesh lipids of teleost fish (3), in the liver lipids of ratfish (4,5), sharks (6)(7)(8) and squids (9)(10)(11)(12)(13)(14)(15), and in the pyloric cecal and ovarian lipids of starfish (16,17). The mantle of the deep-sea squid Berryteuthis magister is marketed for edible consumption and the liver, discarded as waste, is important as a source of glyceryl ethers (9)(10)(11)(12).…”

1-O-Alkylglycerol Ether Lipids in Two Holothurian Species: Cucumaria japonica and C. okhotensis

“…In these species, the branched-chain radicals in molecules of the 1-O-alkylglycerol ether lipids were not found. However, branched-chain 1-O-alkylglycerol ether lipids were discovered in some species of the sea stars [13,14]. The observed differences between C. japonica and C. okhotensis in the 1-O-alkylglycerol ether lipid compositions can be used for distinguishing between these two holothurian species.…”