Effect of Different Storage Temperatures on the Quality and Ultrastructure of Pampus argenteus
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Abstract:
To explore the shelf life of Pampus argenteus under different storage temperatures, the aerobic plate count (APC), pH, total volatile basic nitrogen (TVB-N) content, K values, actomyosin content, total sulfhydryl content, and ultrastucture of Pampus argenteus were measured under conditions of cold storage, partial freezing storage, and frozen storage. The results showed an increase in APCs, pH, TVB-N, and K values with time, under all three storage conditions. The TVB-N content of Pampus argenteus reached values of 0.35 mgN/g, 0.40 mgN/g, 0.16 mgN/g, respectively, after storage for 6 d, 20 d, and 60 d in the frozen state. This observation suggested that frozen storage conditions could effectively retard spoilage of Pampus argenteus. The amount of dissolved actomyosin and total sulfhydryl content decreased with storage time for all three storage conditions. The formation of ice crystals within muscle fibers showed different trends with different storage temperatures. After 20 d of storage under frozen conditions, the muscle fibers of Pampus argenteus were severely damaged, likely because of the formation of ice crystals with large muscle fiber displacement and deformation. In contrast, only partial muscle fiber displacement occurred with partial freezing storage, suggesting that partial freezing conditions could better maintain Pampus argenteus muscle fiber morphology.
