(At least) three things happen when you boil an egg.
– It gets sterilized. Any bacteria or yeast on or in the egg is killed by heat.
– The proteins denature, unwinding into amino acid strands that entangle. This is what causes the solidification of the egg white. Denatured proteins are not the natural food of bacteria, so bacterial growth is slowed.
– The white solidifies. This slows the penetration of any bacteria that arrive after the egg has cooled to a survivable temperature.
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