Lipids Analysis and Rapid Identification of Cod Products

Abstract In this study, fatty acid analysis and lipid nutrition assessment of five common cod products from fishery markets are performed by gas chromatography (GC). Meanwhile, a lipid‐based rapid identification method for cod products using thin‐layer chromatography (TLC) is established. GC analysis showed that 13, 11, 13, 13, and 6 types of fatty acids are identified in Atlantic cod, Pacific cod, sablefish, silver cod, and oilfish, respectively. The nutrition assessment shows that Atlantic cod, Pacific cod, sablefish, and silver cod have healthier atherogenicity index (AI) and thrombogenic index (TI), suggesting these four types of fish have higher nutritive value. In terms of the fatty acid, the five species of fish can be classified by systematic clustering and heat map analysis. The TLC‐rapid lipid identification method shows that sablefish and silver cod contain characteristic triglyceride, and oilfish contains characteristic wax ester, which are obviously different from the Atlantic cod and the Pacific cod. The oilfish could be distinguished from the high nutritive value of sablefish, silver cod, Atlantic cod, and Pacific cod by the rapid identification method in a few minutes. This study provides important nutritional information and a method for rapid identification of cod products.