As the question says, why do we need to refrigerate something after it’s opened? I have a bottle of Chipotle Sauce I got from Target, and it was happily sitting in the shelves for who knows how long unrefrigerated. It says on the label to refrigerate after opening. Why? And I don’t think it’s because Target is air conditioned. Some bodegas in nyc for example are un air-conditioned and will sell similar stuff.
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Opening the package exposes the food to oxygen, which oxidizes (degrades) the food.
Most packages contain some method of preservation, such as using nitrogen to displace regular air (which contains oxygen).
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