CO2冷海水预处理结合气调包装对南美白对虾品质的影响

研究CO₂冷海水处理结合气调包装对南美白对虾的保鲜效果。新鲜南美白对虾经饱和CO₂冷海水处理，采用不同气调包装（QT1，100% CO₂；QT2，40% CO₂+60% N₂；QT3，85% CO₂+5% O₂+10% N₂；QT4，40% CO₂+30% O₂+30% N₂）后于4℃冷藏，以普通空气包装（CK1）和真空包装（CK2）为对照，比较了贮藏过程中菌落总数、pH、挥发性盐基氮、多酚氧化酶活性、质构等指标的变化。结果表明，随贮藏时间的延长，菌落总数、pH、挥发性盐基氮均呈上升趋势，且显示较好的正相关性，多酚氧化酶活性明显下降，剪切力逐渐下降。QT1、QT2和QT3均可抑制贮藏期间菌落总数增加，减缓TVB-N上升速度，同时QT2和QT3可明显抑制多酚氧化酶活性，显示出良好的防褐变效果，在CO₂冷海水预处理的基础上进一步延长2~3 d的货架期。

Effect of CO2-cold Seawater Pretreatment Combined with Modified Atmosphere Packaging on the Quality of Penaeus vannamei

The aim of this study was to investigate the effect of CO 2-cold seawater pretreatment and modified atmosphere packaging on the quality of Litopenaeus vannamei,under refrigeration storage at 4℃.Six treatments were carried out,air(CK1),vacuum(CK2),100%CO 2(QT1),40%CO 2/60%N 2(QT2),85%CO 2/5%O 2/10%N 2(QT3),40%CO 2/30%O 2/30%N 2(QT4).The microorganisms,pH,total volatile basic nitrogen,polyphenoloxidase activity,and texture were monitored and compared.The total bacterial count,pH,and total volatile basic nitrogen displayed a positive correlation and increased along with the storage time.Polyphenoloxidase activity and shering force dropped gradually.Three treatments,including QT1,QT2 and QT3,retarded the values of the total bacterial count and total volatile basic nitrogen.According to the results of polyphenoloxidase activity determination,modified atmosphere packaging of QT2 and QT3 had a better browning inhibitiong effect.The shelf-life of these experimental groups was prolonged for another 2~3 days.