Improved ozonolysis method for analysis of total n−3 fatty acids during hydrogenation of fish oils |
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| Authors: | Laila S. Jacobsen Aage Jart |
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| Affiliation: | (1) Department of Dairy and Food Science, Royal Veterinary and Agricultural University, 1871 Frederiksberg C, Denmark |
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| Abstract: | A rapid and precise method for determining the total amount of n−3 fatty acids in small samples of fish oil is presented. The oil is ozonized at −10°C in hexane solution, and the ozonides are subsequently reduced with triphenyl-phosphine at 40°C. The propanal formed is quantitated by capillary gas chromatography. The method was utilized to follow the industrial hydrogenation of a fish oil, and it was demonstrated that the n−3 double bonds were simultaneously reduced to one-sixth as the iodine value decreased to one-half. |
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| Keywords: | Capillary GC fish oil hydrogenation ozonolysis propanal triphenylphosphine n− 3 unsaturated fatty acids |
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