Modification of the AOAC Qualitative Test for the Determination of Fish Oils and Marine Oils

The current AOAC test for the detection of fish oil in vegetable oils, 28.098, can be readily modified through the use of diluted bromine solution and Wijs solution. This modification allows the precipitation of octabromides, which is indicative of the presence of fish oils, to be observed more clearly. Since the precipitate can be measured, the test can be semiquantitative when known fish oil mixtures are treated in a like manner. This modification has been adopted to replace 28.098.