食品科学 ›› 2020, Vol. 41 ›› Issue (5): 200-206.doi: 10.7506/spkx1002-6630-20190303-017

• 包装贮运 • 上一篇    下一篇

不同冷藏条件下金枪鱼的水分迁移与脂肪酸变化的相关性

王馨云,谢晶   

  1. (上海海洋大学食品学院,上海水产品加工及贮藏工程技术研究中心,上海冷链装备性能与节能评价专业技术服务平台,食品科学与工程国家级实验教学示范中心(上海海洋大学),上海 201306)
  • 出版日期:2020-03-15 发布日期:2020-03-23
  • 基金资助:
    现代农业产业技术体系建设专项(CARS-47);2016年上海市科技兴农重点攻关项目(沪农科攻字(2016)第1-1号); 上海市科委公共服务平台建设项目(17DZ2293400)

Correlation between Changes in Water Mobility and Fatty Acid Profile of Tuna during Cold Storage

WANG Xinyun, XIE Jing   

  1. (Shanghai Engineering Research Center of Aquatic Product Processing and Preservation, Shanghai Professional Technology Service Platform on Cold Chain Equipment Performance and Energy Saving Evaluation, National Experimental Teaching Demonstration Center for Food Science and Engineering (Shanghai Ocean University), College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China)
  • Online:2020-03-15 Published:2020-03-23

摘要: 为了研究金枪鱼在冷藏期间的水分迁移与脂肪酸变化的相关性,采用低场核磁共振(low-field nuclear magnetic resonance,LF-NMR)技术分析金枪鱼肉组织中水分变化规律。横向弛豫时间T2分析结果表明:随着贮藏时间的延长,表征不易流动水的T21逐渐降低,表征自由水的T22逐渐升高。理化指标测定结果显示:随着贮藏时间延长,pH值先下降后上升,硫代巴比妥酸值呈上升趋势,而aw、水分含量不断下降,金枪鱼肉品质下降。相关性分析结果表明:表征强结合水的T2b与C18:0、二十碳五烯酸含量呈显著负相关(P<0.05),T21与二十二碳六烯酸含量呈极显著正相关(P<0.01),T22与C18:0、C18:1n9c含量分别呈极显著(P<0.01)和显著(P<0.05)正相关。因此,可考虑运用LF-NMR技术检测金枪鱼在冷藏期间检测脂肪酸含量的变化,从而表征其品质劣变的程度。

关键词: 低场核磁共振, 水分迁移, 脂肪酸, 相关性

Abstract: In this study, changes in the water mobility of tuna meat were analyzed by low-field nuclear magnetic resonance (LF-NMR) and were correlated with changes in the fatty acid profile. The results of transverse relaxation time T2 indicated that T21 (trapped water) decreased, and T22 (free water) increased gradually with storage time. pH decreased at first and then increased, 2-thiobarbituric acid (TBA) value showed an increasing trend, and water activity (aw) and water content continuously decreased, indicating that the quality of tuna deteriorated. Correlation analysis showed that T2b was significantly negatively correlated with C18:0 and eicosapentaenoic acid content (P < 0.05). T21 was significantly positively correlated with docosahexaenoic acid content (P < 0.01). T22 was significantly positively correlated with C18:0 (P < 0.01) and C18:1n9c (P < 0.05) contents. Therefore, LF-NMR can be considered useful to detect changes in the fatty acid composition of tuna during cold storage, which reflect the extent of quality deterioration.

Key words: low-field nuclear magnetic resonance, water migration, fatty acid, correlation

中图分类号: