Analytical Sciences
Online ISSN : 1348-2246
Print ISSN : 0910-6340
ISSN-L : 0910-6340
Stability of Fish Oil as Evaluated by Oxygen Absorption Method
Yoshihiro YOSHIMURAHiroshi TANAKAKohei TAMURAKeiko OHSAWAKazuo IMAEDA
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1986 Volume 2 Issue 6 Pages 581-584

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Abstract

An improved oxygen absorption method was used for evaluating the stability of the fish oil. Results were compared with those from the direct oxygen determination method, peroxide value (POV) method, gas chromatography (GC), and ultraweak chemiluminescence method. There were close correlations between oxygen uptake and oxygen content, POV, eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) determined by GC. Oxidation of EPA and DHA in the fish oil showed first-order kinetics, the rate constant of DHA being higher than that of EPA. Oxidation of the fish oil was 15- and 30-fold lower than that of linoleic acid and linolenic acid, respectively. Fish oil was easily degraded by UV light, high temperature and oxygen.

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