German researchers have developed and undertaken an in-house validation of an LC-MS and LC-MS/MS-based assay for authenticity testing of certain fish species. An enzyme digest and trypsin hydrolysis of freeze dried samples of commercially available Lutjanus malabaricus (red snapper) and Sebastes spp. (redfish) were analysed by LC-electrospray-MS and MS/MS assay with multivariate analysis, which enabled the two species to be  distinguished from each other. An additional 68 samples [nine additional marine species such as pangasius (Pangasianodon hypophthalmus), salmon (Salmo salar), turbot (Scophthalmus maximus), plaice (Pleuronectes platessa), sole (Solea solea), lemon sole (Glyptocephalus cynoglossus), halibut (Reinhardtius hypoglossoides), red salmon (Oncorhynchus nerka), and great scallop (Pecten jacobaeus)] served as blinded negative controls to ensure the specificity of the assay. 

 Read the abstract here, or the complete research paper

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