After prolonged storage, even at temperatures below −20°C, significant, undesirable sensory changes occur in seafood products [76]. The changes occurring in frozen cod muscle, as shown by taste panel (texture, odor, and taste), include the development of tastelessness and loss of tenderness and the subsequent development of brittleness, off-flavors, and odors [114]. The time scale of these changes as measured by DSC also seemed to coincide with possible aggregation. Significant texture changes during frozen storage include: changes in firmness, juiciness, and fibrousness [142]. A study by Nilsson and Ekstrand [209] reported similar changes in the texture of frozen salmon. Enzymatic hydrolysis of neutral lipids was found to be primarily responsible for the sensory deterioration of salmon during frozen storage [210]. Oil content, fatty acid composition, and concentration of astaxanthin and tocopherols were important for sensory quality as well as frozen stability of salmon during storage [211].
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