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Yes and no. The egg has many natural, built-in barriers to help prevent bacteria from entering and growing. These protect the egg on its way from the hen to your home. But, although it does help, the porous shell itself is not a foolproof bacterial barrier. For additional safety, government regulations require that eggs be carefully washed with special detergent and sanitized.
Other protective barriers include the shell and yolk membranes and layers of the white which fight bacteria in several ways. The structure of the shell membranes helps prevent the passage of bacteria. The shell membranes also contain lysozyme, a substance that helps prevent bacterial infection. The yolk membrane separates the nutrient-rich yolk from the white.
In addition to containing antibacterial compounds such as lysozyme, layers of the white discourage bacterial growth because they are alkaline, bind nutrients bacteria need and/or don’t provide nutrients in a form that bacteria can use. The thick white discourages the movement of bacteria. The last layer of white is composed of thick ropey strands which have little of the water that bacteria need but a high concentration of the white’s protective materials. This layer holds the yolk centered in the egg where it receives the maximum protection from all the other layers. |
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