Influence of seasonal variation and frozen storage temperature on the lipid stability of Atlantic mackerel (Scomber scombrus)
The effect of the storage temperature (-18 ° C vs. 25 ° C) and the fishing season (August vs. September) on the decomposition of fat in Atlantic mackerel caught off the coast of Iceland were examined in this project. Fat stability was assessed by measuring first-stage (PV) and second-degree evolution (TBARS), free fatty acids (FFA) and fatty acid composition. The results show a significant difference in fat degradation with long-term storage, as the degradation was significantly less when stored at -25 ° C compared to -18 ° C. In addition, fish were caught in September with a higher development value compared to fish from August. On the other hand, the most enzymatic fat breakdown was higher in August than in September. The results also indicated that the amount of omega-3 polyunsaturated fatty acids was fairly stable throughout the storage period. In other words, the results showed that the temperature in the cold store had a great effect on fat breakdown, but the stability depended on when the fish was caught.
Lipid deterioration of Atlantic mackerel (Scomber scombrus) caught in Icelandic waters was studied, as affected by different frozen storage temperatures (-18 ° C vs. -25 ° C) and seasonal variation (August vs. September). The lipid stability was investigated by analyzes of hydroperoxide value (PV), thiobarbituric acid reactive substances (TBARS), free fatty acids, as well as changes in fatty acid composition. Results showed significant lipid deterioration with extended storage time, where the lower storage temperature showed significantly more protective effects. Furthermore, a higher lipid oxidation level was recorded for fish caught in September than in August, although lipid hydrolysis occurred to be greater for fish in August than in September. Moreover, results indicated a rather stable level of omega-3 fatty acid during the entire frozen storage period. The analysis indicated that both lipid oxidation and hydrolysis were affected by the frozen storage temperature and the stability differed with regards to season of catch.