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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Packaged food are sterilized when packed, creating a vacuum where no living bacteria are present and cannot get in. This is typically done with heat, either bottling hot produce or heating the can/jar once sealed. Once opened, bacteria can get into the product and begin growing, so refrigeration slows that process.
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