Dried egg whites can last for an indefinite period when stored properly, particularly under most storage conditions. However, the quality might degrade over extremely long periods.
Here's a breakdown:
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Indefinite Shelf Life (Potentially): Unlike fresh eggs, dried egg whites don't spoil in the same way. They are resistant to bacterial growth due to the lack of moisture. As long as they are kept dry and properly sealed, they are technically safe to use almost indefinitely.
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Quality Degradation: While safe, the functionality and flavor of dried egg whites can decrease over time. You might notice:
- Reduced Whipping Volume: The egg whites might not whip up as well as when they were fresh. This is due to changes in the protein structure over time.
- Off-Flavor: In rare cases, particularly if stored improperly (e.g., near strong odors), the dried egg whites might develop a slightly off flavor.
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Proper Storage is Key:
- Airtight Container: Store dried egg whites in an airtight container to prevent moisture absorption.
- Cool, Dry Place: Keep them in a cool, dry place, away from direct sunlight and heat.
- Avoid Contamination: Prevent any moisture or foreign objects from entering the container.
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When to Discard: While rare, discard dried egg whites if you notice any of the following:
- Visible Mold or Discoloration: This indicates moisture contamination and spoilage.
- Foul Odor: A strong, unpleasant odor suggests degradation or contamination.
- Infestation: Signs of insects or pests.
In summary, dried egg whites are safe to use almost indefinitely if stored properly, though their functional properties may decrease over time.
