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- Title
Initial investigation on liver oil extraction from three sturgeon species of the Caspian Sea.
- Authors
Yousefi Jourdehi, Ayoub; Koochekian Sabour, Anoosheh; Zareh Ghashti, Ghorban
- Abstract
Oils from the liver of three species of Caspian Sea sturgeons (Acipenser persicus, Acipenser stellatus, Huso huso) were extracted. The weight of livers comprised 2.0 - 3.5% of total fish weight. On average the amount of liver oil extracted was 11 ± 1 in A. persicus, 10.0 ± 1.0 in A. stellatus and 11.5 ± 0.5 in H. huso. Statistical analysis of data indicated a significant difference between fat extracted from H. huso and A. stellatus and from A. persicus and A. stellatus (p<0.05). No significant differences were observed between liver fats from H. huso and A. persicus (p>0.05). Average values in livers of A. persicus for water content, protein and fat were 75 ± 1%, 13 ± 1% and 11 ± 1%, respectively. For A. stellatus these values were 75.7 ± 0.6%, 13.2 ± 0.8% and 10 ± 1% and for Huso huso these were 74 ± 1%, 13 ± 1% and 11.5 ± 0.5%, respectively. It is evident from the results that there is a substantial amount of fat present in the livery of sturgeon that can have human as well as medical or industrial applications. The iodine index of liver oil indicated their edible value in terms of unsaturated fatty acids which were 118 ± 40% in A. persicus, 123 ±39% in A. stellatus and 121.5 ± 39.5% in H. huso. The peroxide content in A. persicus, A.stellatus and H. huso was 0.8, 1 and 0.9 meq/1000 g sample, respectively. The oleic acid contents were 0.19 mg in A. persicus, 0.22 mg in A. stellatus and 0.2 mg in H. huso. The pH values were in the range of 6.7 - 7.0 in A. persicus, 7-7.1 in A. stellatus and 6.75-7.0 in H. huso. The amount of liver oil extracted from H. huso was higher than from both A. persicus and A. stellatus while this values were also directly related to fish weight and liver weight. The iodine index for A. stellatus was higher than determined for A. persicus and H. huso. Also, the peroxide value and pH for liver oils extracted from A. stellatus was higher than those recorded for A. persicus and H. huso. Finally, pH values recorded in all three species were near neutral values or slightly acidic. It appeared that liver oil extracted from A.stellatus was more susceptible to decay than that of the other two species. This could also be due to the higher content of unsaturated fatty acids.
- Subjects
CASPIAN Sea; FISH oils; STURGEONS; LIVER; FISHERY products; MARINE animal oils
- Publication
Journal of Applied Ichthyology, 2006, Vol 22, p427
- ISSN
0175-8659
- Publication type
Article
- DOI
10.1111/j.1439-0426.2007.01000.x