Two-Stage Shell Egg Heating for Pasteurized Poached Texture
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Solution Overview
Problem
Existing methods for preparing poached eggs are labor-intensive, prone to inconsistency, and pose a risk of Salmonella contamination due to the use of unpasteurized eggs, especially in commercial settings, while achieving a 5-log reduction of Salmonella Enteritidis throughout the egg is critical for pasteurization.
Innovation Solution
A two-stage heating process involving initial heating at 134.5° F. for 18 minutes followed by 160° F. for 6 minutes, or a continuous feed water spray system, to cook and pasteurize shell eggs in-shell, ensuring the yolk is pasteurized and albumen coagulated without overcooking, resulting in in-shell poached eggs that resemble conventional poached eggs when cracked.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional poaching methods are used with unpasteurized eggs, then the eggs can be prepared quickly and with simple equipment, but there is a risk of Salmonella contamination and the process requires manual monitoring and cleaning
Solution Approach 1:
The eggs are pasteurized in advance during the cooking process before they are cracked and served. The heating process at 134.5°F for 18 minutes followed by 160°F for 6 minutes kills Salmonella in the shell eggs before they are prepared for consumption, eliminating the need for separate pasteurization steps and maintaining ease of preparation while removing contamination risk
Solution Approach 2:
The manual monitoring and cleaning processes are replaced by an automated heating system that applies controlled thermal treatment. The system automatically maintains temperatures to achieve both pasteurization and poached egg texture, eliminating the need for manual intervention in monitoring cooking progress and cleaning contaminated surfaces
2Manufacturing precision
If manual monitoring of poaching is performed to avoid overcooking or undercooking, then the egg quality can be controlled, but the preparation time increases and labor requirements increase
Solution Approach 1:
The heating system incorporates temperature monitoring and control mechanisms that automatically adjust heating parameters to achieve the desired poached egg texture. The system maintains 134.5°F for 18 minutes followed by 160°F for 6 minutes based on predetermined feedback from temperature sensors, ensuring consistent results without manual monitoring and reducing preparation time
Solution Approach 2:
The system uses precisely controlled temperature parameters (134.5°F for 18 minutes, then 160°F for 6 minutes) to achieve both pasteurization and optimal egg texture. These fixed parameter changes eliminate the need for manual adjustment and monitoring, ensuring consistent cooking results while reducing preparation time and labor requirements
3Reliability
If the entire egg is heated to meet FDA pasteurization standards, then Salmonella is eliminated, but the albumen may become overcooked and lose its poached texture
Solution Approach 1:
The heating process is divided into two distinct stages: first heating at 134.5°F for 18 minutes to pasteurize the egg contents, then heating at 160°F for 6 minutes to cook the albumen to the desired poached texture. This segmentation allows each stage to optimize for its specific purpose, ensuring both Salmonella elimination and quality texture without overcooking
Solution Approach 2:
The heating process uses periodic temperature changes - alternating between a lower temperature phase for pasteurization and a higher temperature phase for texture development. This periodic action pattern (134.5°F for 18 minutes, then 160°F for 6 minutes) ensures that pasteurization is completed before final cooking, preventing albumen overcooking while maintaining reliability in Salmonella reduction
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method produces consistently high-quality, pasteurized in-shell poached eggs that require only warming before consumption, meeting FDA standards for Salmonella reduction and reducing preparation time and waste.
Implementation Method 1
The purpose of pasteurizing shell eggs is to kill pathogens that may be within the egg, namely Salmonella Enteriditis and other forms of Salmonella. It is critical that sufficient heat be provided to meet the 5-log reduction standard throughout the entire mass of the egg
Implementation Method 2
the albumen is firm... the yolk is warmed but remains in liquid form... the outer albumen is wispy when cooked
Data Source
AI summary
Two stage heated water treatment of shell eggs results in-shell poached eggs. The in-shell poached are sufficiently cooked so when the eggs are cracked onto a plate the eggs have the characteristics of conventional poached eggs without further cooking and need only to be warmed for consumption. The in-shell poached eggs are also pasteurized in the shell to meet the FDA and WHO requirement of a 5-log reduction of Salmonella Enteritidis.