Researchers at Queens University Belfast have developed a multi-variate analysis classification model for salmon by fusing together data from mass spectrometry of lipids (“lipidomics”, using direct analysis with the “ion knife” REIMS sampling source) and elemental analysis of 46 metals and minerals. The results were published last month in Nature Communications (here). The classification model could discriminate farmed vs wild salmon. It could also discriminate between fish from Alaska, Norway, Iceland and Scotland. The main lipid biomarkers that drove this discrimination were identified. The differences were probably due to vegetable oil supplementation in fish feed. An incidental finding from the work, previously unreported, was that many Alaskan and Icelandic wild salmon contain elevated levels of cadmium.
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