A method is presented for the analysis of the fatty acid compositions in each of the three positions of a triglyceride. Diglycerides are obtained from the triglyceride by lipolysis with pancreatic lipase, and converted to a mixture of Dand L-phosphatidyl phenol. The L-phosphatide is then hydrolyzed by phospholipase A, leaving a lysophosphatide with the fatty acid in position 1, free fatty acid ...

Lipid collected from the surface of the human forehead is predominantly (-95%) the product of the sebaceous glands (1) and contains on the average 41 % triglycerides, 16.5% free fatty acids, 25% wax esters, 12% squalene, 1.5% cholesterol, 2% cholesterol esters, and 2% diglycerides (2). This sebum composition shows little variation between normal subjects or over long periods of time in individu...

Skin surface lipid samples were collected by the hexane sponge technique from the foreheads of 180 male and 131 female Saudi subjects living in the Jeddah-Makkah area (summer temperatures up to 47 degrees C). The lipid samples were analyzed by densitometric thin layer chromatography. Seven major lipid classes were determined. The percentages for squalene, cholesterol esters, wax esters, triglyc...

The present study is mainly focused on the screening of seven microorganisms for the production of most efficient lipase enzyme for the formation of glycerides (mainly monoglycerides and diglycerides). It was found that Mucor racimosus lipase enzyme was superior to all the other tested microbial lipases for the production of partial glycerides and triglycerides. The experiments were designed on...

Lipids extracted from the raw frozen and boiled-frozen krill, Euphausia superba, harvested in the Antarctic Ocean were identified and quantitated by a combination of thin-layer and gas-liquid chromatography. The lipid contents of E. superba on the wet weight basis were 3.41% of the raw frozen sample and 5.62% of the boiled-frozen sample. There were shown to consist of 0.8% of steryl esters, 27....

Transesterification of beef tallow and methanol is affected by many factors. Catalyst, free fatty acids, and water in beef tallow, and reaction time were investigated. Sodium hydroxide (NUOH) was a more effective catalyst than sodium methoxide (NaMeOj. NaOH and NaMeO reached their maximum activities at 0.3% and 0.5%, w/w of beef tallow, respectively. The presence of water had more negative effe...

The present study was conducted to evaluate the effect of low-dose gamma irradiation (0, 1, 3 and 5 kGy) on fatty acid composition of Rainbow trout (Oncorhynchus mykiss) fillet. Among all of the fatty acids, oleic acid (C18:1) (with mean 33.50±3.02 g/100 g fatty acids) and myristoleic acid (C14:1) (with mean 0.41±0.26 g/100 g fatty acids) were the most predominant and the lowest fatty acids in ...

  In this study changes in fatty acids profile during frozen storage at -18°C of Cobia (Rachycentron canadum), caught from the Persian Gulf (Bandar Abbas) were studied. Changes in saturated fatty acids (SFAs), monounsaturated fatty acids (MUFAs), polyunsaturated fatty acids (PUFAs), EPA+DHA/C16, n-3 PUFA/n-6 PUFA (n-3/n-6) and polyunsaturated fatty acids /saturated fatty acids (PUFA/SFA) were i...

  In this study changes in fatty acids profile during frozen storage at -18°C of Cobia (Rachycentron canadum), caught from the Persian Gulf (Bandar Abbas) were studied. Changes in saturated fatty acids (SFAs), monounsaturated fatty acids (MUFAs), polyunsaturated fatty acids (PUFAs), EPA+DHA/C16, n-3 PUFA/n-6 PUFA (n-3/n-6) and polyunsaturated fatty acids /saturated fatty acids (PUFA/SFA) were i...