包装方式对四角蛤蜊卤制风味产品贮藏品质的影响

目的：研究不同包装方式对其贮藏期品质的影响。方法 对四角蛤蜊卤制风味产品进行普通包装、真空包装、30% CO2+70% N2、50% CO2+50% N2、30% N2+70% CO2气调包装，并在4 ℃贮藏条件下，测定菌落总数、质构特性、色差、TVB-N值、风味特性等理化指标，选择最佳的包装方式。结果 普通包装样品在第3 d、真空包装组样品在第6 d时菌落总数超标，而气调包装组的货架期可达12 d左右。气调包装组的硬度、弹性、咀嚼性的下降程度都低于普通包装和真空包装组，气调包装的护色效果也优于其他两组。气调包装对TVB-N值、TBA值、pH值变化的延缓作用明显优于真空包装和普通包装。结论 不同包装方式对四角蛤蜊卤制风味产品贮藏品质的保持能力依次为气调包装、真空包装、普通包装，其中50% CO2+50% N2气调包装保鲜效果最佳，能显著延长产品货架期。

Effects of packaging methods on the quality of marinated Mactra quadrangularis during storage

Objective To study the effects of different packing methods on the shelf life quality of marinated Mactra quadrangularis. Methods The marinated clams were packaged by air packaging, vacuum packaging, and modified atmosphere packaging of 30% CO2+70% N2, 50% CO2+50% N2, 30% N2+70% CO2, then stored at 4 °C. the physical and chemical indexes such as the total number of colonies, texture characteristics, color difference TVB-N value, flavor characteristics, and so on, were measured, and the best packaging method was selected. Results The total bacterial colonies of ordinary packaging samples were exceeded on day 3, and the samples of vacuum packaging group were exceeded on day 6, while the shelf life of the modified atmosphere packaging group were up to about 12 d. The degrees of decrease hardness, elasticity and chew ability of the modified atmosphere packaging group were all lower than those of the ordinary packaging and vacuum packaging group, and the color protection effect of the modified atmosphere packaging group was also better than the other 2 groups. The delayed effect of modified atmosphere packaging on the change of (total volatile basic nitrogen) TVB-N, thiobarbituric acid (TBA) and pH value was obviously better than that of vacuum packaging and ordinary packaging. Conclusion The storage quality of the Mactra quadrangularis with different packaging methods is maintained in the following order: modified atmosphere packaging, vacuum packaging and ordinary packaging, among which the 50% CO2+50% N2 modified atmosphere packaging could obtain the longest shelf life of samples during storage.