Gas exchange into shell eggs from cryogenic cooling

The gas composition of the air cell in a shell egg is influenced by heating from egg washing and candling and the method of cooling and storage. This study found that N-2 gas (-122 C), CO2 gas (-45 C), and cold air (-15 C) co uld be used to rapidly cool shell eggs from 47.7 C to 7 C in 30 min or less . These results suggest that the gas composition of the air cell in shell e ggs can be significantly modified using N-2 cooling and CO2 cooling. Commer cial field studies have shown that these modifications, which take place du ring cryogenic cooling, can significantly reduce microbial levels and incre ase shelf life of shell eggs. Storage in a modified atmosphere environment further enhanced these changes. It was found that the CO2 concentration in the air cell of a shell egg can be increased from 0.04 to 48% by CO2 coolin g and storage in a CO2 environment.