基于低压核磁共振(LF-NMR)技术对东海带鱼(Trichiurus lepturus)保鲜品质及水分迁移特性的研究

为探究东海带鱼(Trichiurus lepturus)在低压核磁共振(LF-NMR)技术下的品质变化及水分迁移特性,以挥发性盐基氮(TVB-N)含量、pH、水分含量为指标,并分析NMR横向弛豫时间T₂反演谱图和MRI成像,研究不同电场强度(DY₁~DY₄分别为0,2,2.5,3kV/m)对带鱼内部水分迁移及品质的影响。分析TVB-N数据发现,DY₃(E=2.5kV/m)、DY₄(E=3kV/m)在贮藏后期表现出更佳的保鲜优势。在0~40d贮藏期内,不同电场强度条件下的带鱼pH值均呈先降后升趋势。电场的添加能降低自由水的流动性,抑制微生物生长,减少带鱼体内水分流失。分析NMR横向弛豫时间T₂反演谱图发现,T₂₁、T₂₂、T₂₃峰面积均有不同程度减小,其中T₂₂信号幅度变化最大,表明电场的添加能改变带鱼体内水分迁移路径,维持较高的水分含量,增加带鱼持水性和保水性。MRI成像图表明在贮藏期间,电场处理后带鱼水分保有率得到了提升,保鲜效果优于未施加电场带鱼,且电场强度越大,体外迁移水分越少。实验表明低压核磁共振(LF-NMR)技术对东海带鱼具有良好的保鲜效果,对低压核磁共振(LF-NMR)技术的保鲜应用提供一定的理论指导作用。<

STUDY ON PRESERVATION AND WATER RETENTION IN HAIRTAIL TRICHIURUS LEPTURUS FROM THE EAST CHINA SEA IN LF-NMR TECHNOLOGY

To understand the quality change and water migration in hairtail Trichiurus lepturus under low-pressure nuclear magnetic resonance, the influence of electric field in different intensities (Groups DY₁~DY₄: E=0, 2, 2.5, 3 kV/m, respectively) on the internal water migration and quality of hairtail was studied in experiment, in which the content of volatile base nitrogen (TVB-N), pH, and water content were measured, and the T₂ inversion of NMR transverse relaxation time and MRI imaging were analyzed. Results of TVB-N data analysis show that DY₃ (E=2.5 kV/m) and DY₄ (E=3 kV/m) showed better fresh-keeping advantages in the storage period. During the storage period of 0~40 d, the pH value of hairtail under different electric field intensities decreased at the beginning and then increased in tendency. The application of electric field could reduce the fluidity of free water, inhibit the growth of microorganism, and reduce the water loss in hairtail. By analyzing the T₂ inversion spectra of NMR transverse relaxation time, the T₂₂ and T₂₃ peak areas decreased to different degrees, and the amplitude of T₂₂ signal changed the most, indicating that the application of electric field can change the water migration path in the fish, maintain higher water content, and increase water retention and water retention of the fish. MRI imaging showed that during storage, the water retention rate of hairtail was improved after electric field treatment, and the preservation effect was better than that without the treatment, and the greater the electric field intensity, the less water migrated in vitro. The experimental results show that LF-NMR technology had a good effect on the preservation of hairtail of the East China Sea. This study provided a theoretical base for the application of LF-NMR technology in the preservation of ribbonfish and other similar fishes.<