• Korean Journal of Fisheries and Aquatic Sciences
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• v.9 no.3
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• pp.195-202
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• 1976

The present investigation was performed to find the lipid composition of the total lipids, the fatty acid components of the neutral lipids and the phospholipids, and the composition of sterols, from Spisula sachalinensis. The results obtained are as follows ; 1) The main components of the total lipids are phospholipids$(43.1\%)$, triglyceride$(36.2\%) $, and sterol $(10.3\%)$. 2) The phospholipids are mainly composed of phosphatidyl choline, phosphatidyl ethanols, mine, phosphatidal ethanolamine and phosphatidyl serine. 3) The main fatty acids of the neutral lipids, the ethanolamine phospholipids and choline phospholpids, are C20:5, C16:1, C16:0, C20:5, C18:0, C22:6 and C16:0, C20:5, C22:6, respectively. Oleic acid content of all fractions is very small compared with one of gastropoda lipids and fish oil. 4) Most of plasmalogen are present in the ethanolamine phospholipids and only trace of plasmalogen in the choline phospholipids. 5) Sterols to be found are 22-trans-norcholesta-5, 22-diene-$3\beta$-ol, 22-dehydrocholesterol, cholesterol, brassicasterol, 24-methylenecho-lesterol and $\beta-sitosterol$.

• Journal of the Korean Society for Precision Engineering
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• v.18 no.2
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• pp.161-170
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• 2001

Synthetic water-based metal-cutting fluids are increasingly popular in the metal-working industry because of its environmental friendliness. The propose of this study is to investigate the synergistic effect of combining polyethylene glycol and common fatty acid in formulating a metal-cutting fluid. The tested metals were aluminum, copper and steel, and the test was performed with a modified drilling machine. From the study, it was found that there existed some synergistic effects on the drilling efficiency of the metals to decrease of cutting time, cutting energy, torque as well as the smoothness of surface depended on the formulation ratio of the two fluids.

• Korean Journal of Food Science and Technology
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• v.16 no.2
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• pp.192-200
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• 1984

Total lipid contents in rice bran for Poong-San(Tongil) and Dong-Jin(Japonica) were 16.13% and 16.97%, respectively. Neutral lipids for Pong-San(75.20%) were slightly higher than those for Dong-Jin(73.69%), whereas contents of glycolipid for Poong-San(16.71%) were lower than those for Dong-Jin(22.80%). Contents of phospholipid in Poong-San(8.09%) were much higher than those in Dong-Jin(3.51%). Acid, peroxide and thiobarbituric acid value of total lipids extracted from rice bran of Poong-San were slightly lower than those of Dong-Jin. Iodine value showed the reverse trend. The neutral lipids were fractionated and identified as hydrocarbon, esterified sterol, triglyceride, free fatty acid, free sterol, diglyceride and monoglyceride. Triglyceride contents were less than common edible oils, but diglyceride and monoglyceride contents were higher. Among the glycolipids contained in the polar lipids, esterified sterylglycoside(11.46%) was the most abundant. Of the phospholipids, phosphatidyl ethanolamine, phosphatidyl inositol and phosphatidyl choline were the major components. Main fatty acids in the total lipids, three lipid components and stepwise eluted individual lipids were olelic acid, linoleic acid and palmitic acid. The fatty acid composition of the neutral lipids was similar to that of the total lipids. In glycolipids, the content of linoleic acid was higher than that of oleic acid, and palmitic acid was predominant in the fatty acid composition of the esterified sterylglycoside.