带鱼冷藏过程中品质变化与水分迁移的相关性

为了研究带鱼在冷藏期间的品质变化与水分迁移的关系,利用低场核磁共振(low-field nuclear magnetic resonance,LF-NMR)技术分析组织中水分变化规律。横向弛豫时间T_2的结果表明:随着贮藏时间的延长,不易流动水(T_(22))逐渐降低,自由水(T_(23))逐渐升高,肌原纤维内的水向外移动而大量流失,肌肉的持水能力下降、肉质逐渐劣化。这与传统理化指标的研究结果一致,且相关性分析表明,T_(22)、T_(23)与水分含量、蒸煮损失率等指标极显著相关(P0.01),与感官评分、持水力、硫代巴比妥酸值显著相关(P0.05)。因此,可考虑运用LF-NMR技术检测带鱼在冷藏期间的品质变化。

Correlation between Quality Change and Moisture Migration of Trichiurus haumela during Cold Storage

In order to study the relationship between the quality change and water migration of Trichiurus haumela during cold storage, low-field nuclear magnetic resonance (LF-NMR) was used to analyze changes in different states of water in fish tissue. The transverse relaxation time (T2) spectrum showed that with increasing storage time, T22 gradually reduced and T23 increased, suggesting that a significant amount of water within myofibrils was moved outwards and lost, resulting in reduced water-holding capacity of fish muscle, and gradual quality deterioration. This is consistent with the results of traditional physical and chemical analysis. In addition, T22 and T23 had a high significant correlation with water-holding capacity, water content and cooking loss (P < 0.01), being significantly correlated with sensory evaluation and thiobarbituric acid (TBA) (P < 0.05). Therefore, LF-NMR technique could be used to detect the quality change of Trichiurus haumela during cold storage.