恒温蓄冷剂冻结对大黄鱼品质的影响

Effect of Freezing with Cold Storage Agent at Constant Temperature on the Quality of Large Yellow Croaker

为提升冷冻大黄鱼的品质,以养殖大黄鱼为研究对象,在无包装空气自然循环冻结(UAF-0)、真空薄膜包装空气自然循环冻结(PAF-1)基础上,探讨了真空薄膜包装蓄冷剂自然循环冻结(PLF-1)、无包装蓄冷剂自然循环冻结(ULF-0)等冻结条件下大黄鱼的冻结速率及理化等指标的变化。结果表明,虽然PLF-1方式下最大冰晶生成带与ULF-0相比延长了44 min,但大黄鱼肌原纤维组织微结构比较清晰,肌肉组织损伤及色差变化较小,硬度、弹性、咀嚼性、恢复性分别仅下降6.8%、1.2%、1.2%、1.9%,pH值变化不显著(P>0.05),盐溶性蛋白下降不显著(P>0.05),TVB-N上升最慢。综合比较4种冻结方式,其品质按优劣为:PLF-1>ULF-0>PAF-1>UAF-0。

In order to improve the quality of frozen large yellow croaker,breeding large yellow croaker was selected for the project.Based on unpackaged air circulation freezing(UAF-0),vacuum film packaging air circulation freezing(PAF-1),the study compared the differences of freezing rate,physical and chemical properties of large yellow croaker between vacuum film packaging cold storage cycle freezing(PLF-1)and unpackaged refrigerant circulating freezing(ULF-0).The results showed that although the time for maximum ice crystal formation in the PLF-1 mode was 44 minutes longer than that in the ULF-0 mode,the myofibril microstructure of large yellow croaker was relatively clear,the muscle tissue damage and chromatic aberration change were relatively small,and hardness,elasticity,chewiness and recovery were only decreased by 6.8%,1.2%,1.2%and 1.9%,respectively.Neither the change of pH nor the decrease of salt soluble protein content was obvious(P>0.05),the rising rate of TVB-N was the slowest.Comparing the large yellow croaker quality of four freezing methods,the following was the order from good to bad:PLF-1>ULF-0>PAF-1>UAF-0.