牛至精油-壳聚糖复合涂膜协同茶多酚对海鲈鱼品质影响

Effects of Origanum vulgate L. essential oil-chitosan composite coating combined with tea polyphenols on quality of Lateolabrax japonicus

为延长海鲈鱼货架期,采用不同方式(处理组A:牛至精油-壳聚糖+流化冰+-3 ℃贮藏和处理组B:牛至精油-壳聚糖协同茶多酚+流化冰+-3 ℃贮藏)贮藏海鲈鱼,并设立对照组(流化冰+-3 ℃贮藏),探讨生物保鲜因子协同处理对海鲈鱼品质的影响。结果表明,与对照组相比,处理组A、处理组B可有效延缓海鲈鱼pH、挥发性盐基氮、菌落总数、 K 值、硫代巴比妥酸反应物(thiobarbituric acid reactive substance,TBARS)上升,同时可显著抑制肌原纤维蛋白溶出量、Ca2+-ATPase、总巯基下降( P <0.05);在贮藏末期(第12天),处理组B挥发性盐基氮、菌落总数、 K 值分别为14.21 mg/100 g﹑3.22 (lg CFU/g)﹑18.04%,就考察上述3个指标而言,处理组B较对照组可延长约6 d货架期;8个指标可简化为1个主成分,其方差贡献率为93.809%,该试验为海鲈鱼低温保鲜提供数据参考。

In order to prolong the shelf life of Lateolabrax japonicus , effects of synergistic treatment of biological preservation factors were studied. Lateolabrax japonicus was coated by Origanum vulgate L. essential oil and chitosan and stored in fluidized ice at -3 ℃(treatment A), or coated by Origanum vulgate L. essential oil, chitosan, and tea polyphenols and stored in fluidized ice at -3 ℃(treatment B). The results showed that compared against the control, both treatment groups could effectively delay increases in pH, TVB-N, total numbers of colony, K value and TBARS value of Lateolabrax japonicus , and significantly inhibited decreases in myofibrillar protein dissolution, Ca2+-ATPase and total sulfhydryl groups ( P <0.05). At the end of storage (day12), TVB-N, total numbers of colony and K values of treatment group B were14.21 mg/100g,3.22 lg (CFU/g), and18.04%, respectively, indicated that treatment B could prolong the shelf life of Lateolabrax japonicus by about 6 d compared against the control, which provides data support and reference for preserving Lateolabrax japonicus at low temperature.