The 1-O-alkylglycerol composition of the liver oil of the deep sea shark Centrophorus squamosus, a species which provides edible flesh, has been determined. After various fractionations of the oil, the unsaponifiable fraction was characterized by means of gas chromatography/mass spectrometry, electron impact, and positive-ion chemical ionization. The oil is composed of 60% unsaponifiable matter, containing 45% squalene, 4.5% cholesterol, and 10% of linear saturated and monounsaturated glycerol ethers with 14-18 carbon atoms. After a first separation by chromatography on silicic acid, monounsaturated glycerol ethers have been separated from the saturated homologues, in particular from 1-O-octadecylglycerol (batyl alcohol) and 1-O-hexadecylglycerol (chimyl alcohol), via urea complexation. This newer application of the urea method, already used in the past to extract saturated from polyunsaturated fatty acids, allowed the purification of the main components of the complex unsaturated glycerol ether fraction, namely, 1-O-octadecen-9'ylglycerol (selachyl alcohol) and 1-O-hexadecen-9'ylglycerol.
The stability of various biphosic systems has been determined using a High Performance Centrifugal Partition Chromatograph, and its relationship with various physical parameters has been estimated. The stability seems to be related to l, the ratio of the interfacial tension to that of the density difference between the two phases, and which is a parameter accounting for both the "Stoke's radius" of the mobiie phase, i.e. the radius of droplets of mobile phase which wiil have the same average linear velocity, 0. in the channels than the experimentally determined value, and the "fragility" of these droplets. The average linear velocity of the mobile phase is not dependent upon the acceleration field in the range studied, which means that, using the "Stoke's model" (droplets, even if they do not exist), the higher the acceleration field. the smaller the droplets. Consequently, there is a linear relationship between the efficiency and the rotational speed, provided all other parameters are kept constant.
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