纳米Ag/ZnO-壳聚糖复合涂膜对带鱼鱼丸的保鲜性能研究

The preservation properties of nano-Ag/ZnO-chitosan coatings onHairtail fish balls

以带鱼鱼丸为保鲜对象研究了Ag修饰量对纳米Ag/ZnO-壳聚糖复合涂膜保鲜性能的影响.研究结果表明,与未处理的鱼丸相比,经涂膜处理后,鱼丸的白度和弹性差异不显著,而菌落总数、pH、TMA、凝胶强度等鲜度指标和硬度、回复性、咀嚼性等质构指标更优,其中ZnO和Ag/ZnO改性的复合壳聚糖涂膜的保鲜性能优于单一壳聚糖涂膜,0.5%Ag/ZnO-壳聚糖复合涂膜表现出最高的保鲜性能.Ag/ZnO-壳聚糖复合涂膜能有效抑制鱼丸微生物的繁殖,延缓鱼丸新鲜度和质构的变化,使鱼丸的货架期延长8 d.该研究成果可为鱼丸的涂膜保鲜提供技术支持.

In order to study the effect of the doping dosage of Ag on the preservative properties of nano-Ag/ZnO-chitosan composite coatings,choosing the Hairtail fish balls as the objects.The results show that,compared with the untreated fish balls,after treated by the coatings,the differences of whiteness and elasticity of fish balls are not significant,while the freshness indexes such as total number of colonies,pH,TMA,gel strength and the texture indexes such as hardness,resilience and mastication are better.Among them,the preservation properties of the ZnO and Ag/ZnO modified composite chitosan coatings are better than the chitosan coating,and the preservation properties of 0.5%Ag/ZnO-chitosan composite film is the optimal.The reproduction of microorganisms in the fish balls is effectively inhibited,and change of freshness and texture of fish pellets are effectively delayed by 0.5%Ag/ZnO-chitosan composite coating.So the shelf life of fish balls is prolonged for 8 days.The research results can provide technical support for the preservation of fish balls by the coatings.