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Canned food can maintain 1+ year in good state. However, when you open the can, the countdown starts.

I read it happens because microorganism from the outside reach the inside of the can.

My question is: Is it possible to keep food inside the just opened can free of microorganisms? Maybe moving immediately to an airtight container and take out the needed amount with a cleaned spoon? (If a cleaned spoon still contains microorganism --- why clean it in the first place?)

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    Clean spoon does not have food to feed the microorganism.
    – paparazzo
    Feb 19 '17 at 22:40
  • You will notice that stuff in an airtight container does have less propensity of spoiling catastrophically and quickly if only touched with clean utensils - but unsealing the can still degrades the content from "sterile/pasteurized" to "very damn clean"!
    – rackandboneman
    Feb 20 '17 at 10:42
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No.

When you can something, the temperature and pressure kill bacteria and micro-organisms.

Once its exposed to air, you're exposing it to bacteria and micro-organisms. Despite you thinking the spoon is clean, it still has some bacteria and micro-organisms on it which will get into the food. And your "airtight" container is likely not nearly as airtight as a can.

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