Effect of composite conting with nano-silicon dioxide on fresh-keeping of preserved eggs

To protect the quality of fresh-keeping preserved eggs, polyvinyl alcohol (PVA)-based composite coating-packaging materials were modified by adding nano-SiO2. The effects of nano-SiO2 stearic acid, glutaraldehyde and reaction temperature on the water vapor transmission of formed films with composite coating-packaging materials were investigated by response surface methodology. At the end of the storage, the physical, chemical, microbiological and sensory indicators of the eggs of each group were measured and compared. The results showed that the physical, chemical, microbiological and sensory indicators of the twice coating-packaging group of preserved eggs with the optimized PVA-based nano-packaging materials was stronger than that of the other three groups(p>0.05). These results indicated that the preserved eggs coating with Ⅰtype of PVA-based nano-composite materials could effectively prevent the water loss，inhibit microbial growth, protect the color and flavor of preserved eggs after 6 months storage. This study provides a technology basis for storage of preserved eggs.