Why does canned food expire soon once the can is opened?
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?)
Best Answer
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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Quick Answer about "Why does canned food expire soon once the can is opened?"
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.Why does canned food easily spoil once the can is opened because of?
If the can is exposed to sunlight (which is heat), the air inside the can will begin to expand, and that temperature increase makes an ideal environment for the microorganisms to begin to thrive and multiply. This isn't common, but it can certainly happen. Make sure to keep canned food in cool, dry and dark places.Does canned food go bad after opening?
The guidelines note that while food in cans "retains its safety and nutritional value well beyond two years," its color and texture may change after that time. Many factors affect how long a food will stay edible in the can, but food kept at "moderate temperatures (75 degrees or below)" may last indefinitely.Why does canned food expire?
Over the years, many canned foods will experience taste and texture changes, and may eventually lose their nutritional value \u2014 which is why it's recommended to consume different types of canned products by a certain time for the best quality.How long can something stay in a can after opening?
Most canned food is safe to use two to seven days after opening, depending on the food, according to Purdue University Extension. Foods such as fish last just two days, while canned fruit is good for a week. Store opened cans in the refrigerator and take other safety precautions to avoid contamination.How Long Does Canned Food Last? Survival Tip
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