Study On Disinfection And Preservation Of Gas Chlorine Dioxide On Shell Eggs

Eggs rich in nutrients, which is an ideal source of protein. But eggs may be contaminatedwith bacteria from feces, infected nests, factory transfer belts, and air and packing materials.This makes the safety and quality of eggs to be greatly affected. In this paper, chlorinedioxide gas was used to treat eggs in this investigation, which in order to improve the safetyof eggs, to delay quality change of eggs. The contents and results of testing are as follows:Escherichia coli, Staphylococcus aureus and Salmonella, which pose a threat to thesafety of eggs, were inoculated on eggs. The inoculated eggs were treated with15,20and25mg/L of chlorine dioxide gas each for3,5and8minutes. The results showed that a largenumber of bacteria were killed by all of the treatments. The bactericidal effectiveness was:E.coli5.26log, S.aure6.01log and Salmonella7.26log at25mg/L of chlorine dioxide gasthat were treated for8minutes.The eggs that treated with15,20and25mg/L of chlorine dioxide gas each for3,5and8minutes and control group eggs storage at20℃~25℃and50%~70%of relative humidity,sensory index and physical-chemical index was measured every6days. The results showedthat the freshness index of sterilization treatment eggs was significantly better than the controlgroup eggs; the higher the concentration of chlorine dioxide gas, the longer the time ofsterilization, the better preservation.The0d eggs and3d eggs were treated with25mg/L of chlorine dioxide gas for8minutes respectively, storage at20℃~25℃and50%~70%of relative humidity, sensoryindex and physical-chemical index was measured every3days. The results showed that thefreshness index of0d eggs changes more slowly than3d eggs.The eggs were treated with25mg/L of chlorine dioxide gas for8minutes, storage at20℃~25℃and50%~70%of relative humidity. The results showed that the foam ability, foamstability of the egg albumen and yolk emulsification capacity, which was measured every10days, of sterilization treatment eggs were better than the control grouped.The eggs were treated with25mg/L of chlorine dioxide gas for8minutes, and one groupeggs was removed eggshell membrane that outer surface of the shell with sterile water andsteriled. By measuring the quality indicators of the different groups of eggs during storage,the results showed that the quality of the eggs that the external eggshell membrane integritybetter than the damaged eggs.The eggs coating paraffin oil directly and the sterilized eggs coating with paraffin oilstorage at20℃~25℃,50%~70%of relative humidity, sensory index and physical-chemicalindex was measured every6days. The results showed that the freshness index of bactericidal-coating eggs better than direct coating eggs. This result suggests that eggs have betterpreservation effect of chlorine dioxide gas sterilization treatment before coating preservation.This study shows that the chlorine dioxide gas to improve the quality and safety of eggsis important，and has broad application prospects in the field of eggs sterilization and storage.