Cryogenic Gas for Rapid Cooling of Commercially Processed Shell Eggs Before Packaging

Area of Science:

• Food Science
• Microbiology
• Agricultural Engineering

Background:

• Traditional egg cooling methods are time-consuming and may not adequately reduce microbial load.
• Maintaining egg quality and safety throughout processing is crucial for consumer health.
• Cryogenic cooling offers a potential rapid cooling solution for perishable products.

Purpose of the Study:

• To evaluate the impact of cryogenic gas cooling on egg quality parameters.
• To assess the effect of cryogenic cooling on microbial counts in eggs.
• To compare cryogenic cooling with traditional cooling methods in commercial egg processing.

Main Methods:

• A 2x2 factorial design was employed with cryogenic cooling and Pseudomonas inoculation as variables.
• 1440 eggs were subjected to either cryogenic or traditional cooling.
• Evaluated parameters included cracked shells, Haugh units, albumen pH, and bacterial counts.

Main Results:

• Cryogenic cooling significantly reduced egg temperature faster than traditional methods.
• Cryogenically cooled eggs exhibited significantly higher Haugh unit values.
• Internal bacterial counts were significantly lower in cryogenically cooled eggs, though no difference was observed after 30 days of storage.

Conclusions:

• Rapid cooling with cryogenic gases enhances egg quality, indicated by higher Haugh units.
• Cryogenic cooling effectively reduces initial internal bacterial contamination in eggs.
• This technology shows promise for improving the safety and quality of commercially processed shell eggs, potentially reducing Salmonella enteritidis growth.