Modern Food Science and Technology
The total lipids of different parts of Russian sturgeon were extracted using the Folch method and analyzed by gas chromatography/mass spectrometry(GC/MS). The fatty acid composition was determined by MS database search and comparison with standards. This study showed that the types of fatty acids and their contents in fish muscle, eggs, skin, and lenticular tissue were similar. The content of polyunsaturated fatty acids(PUFAs) was more than 40%, followed by monounsaturated fatty acids(about 30%) and saturated fatty acids(about 17%).Linoleic acid and docosahexenoic acid(DHA) were the main PUFAs. Fish muscle contained 12.83% of the total lipids, which was composed of 42.37% PUFA and 17.25% eicosapentaenoic acid(EPA) + DHA. Fish eggs contained 14.46% of the total lipids, 22.10% of which were n-3 fatty acids. Fish skin had a high content of n-6 fatty acids(19.43%). The lenticular tissue contained 14.45% of the total lipids, and its PUFA, monounsaturated fatty acid, and EPA + DHA contents were 42.66%, 34.07%, and 17.38%, respectively. The n-3 and n-6 fatty acids were not detected in the maw of the sturgeon. The liver contained 55.92% of the total lipids, in which the monounsaturated fatty acids, mainly containing 9-octadecenoic acid(49.82%), were particularly prominent(up to 55.81%), while the saturated fatty acids only accounted for 17.24%. The vertebrae contained only 0.09% of the total lipids.