Will botulism growing in my home-canned vegetables pop the lid?
I remember that in my biology class in high school the teacher told showed us a puffed up can of pineapples which he claimed had botulism in it.
Is that remotely true? and if so, can I tell if my canned ketchup has botulism in it through the same "method"? and if so how long might that take?
Best Answer
One reason botulism is so scary is that you can's see, smell, or taste the bacteria growing in there. The only way to know for sure if botulism is growing in food is to have it tested by a laboratory.
Fortunately, though, you can see its evidence.
Yes, a puffed-up can or a jar w/ the lid popped up means something's growing in there. Discard the material; do not consume it.
Discard a metal can if there's any visible opening, no matter how small, if the ends are bulging, if the seam doesn't look intact, or if there's a leak.
Discard a jar if the jar appears cracked at all, if the pop-top doesn't pop when opened (meaning there's no longer a vacuum inside), or if the seal appears damaged.
As for how long it takes for a problem to arise, I'm not sure; I've had the same question.
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Quick Answer about "Will botulism growing in my home-canned vegetables pop the lid?"
yes, botulism can occur if a jar has a popped up lid. To be safe, everytime you eat canned goods, make sure that you've heated it at 121 °C. It's one way to kill the botulism bacteria.Why did my canning lids pop up?
Canning rings too tight As the filled jar is heated, headspace pressure increases until excess air is vented from the jar. When the band is applied too tightly, there is no way for air to be exhausted from the jar. Consequently, the pressure build-up warps the lids and disrupts the seal formation.Can botulism grow in a sealed jar?
The lid should have a dip in the center when it has cooled and sealed. Store jars without the ring. Metal to metal can rust and even a pinhole of air can enable bacteria to grow. If there is any botulism in the jar, it can make you very sick or even lead to death.How do I know if my home canned food has botulism?
the container is leaking, bulging, or swollen; the container looks damaged, cracked, or abnormal; the container spurts liquid or foam when opened; or. the food is discolored, moldy, or smells bad.Can lids pop after canning?
Generally, you'll put them on the counter and after a few minutes, they'll start popping. The popping sound when canning is a good thing IF it indicates that this lid is popping down. Just leave the jar on the counter. Ignore the popping sound, or you can even watch them and see lids going up and down.More answers regarding will botulism growing in my home-canned vegetables pop the lid?
Answer 2
It can. C. botulinum (botulism is the disease you get from this bacteria) and other bacteria produce gas that will cause a can to bulge, given enough time. The pineapples he showed you either had a severe C. boulinum colony growing inside or some other nasty bacteria.
Regarding your ketchup, if your can is distended in any way, throw it out. However, the fact that it is not showing outward signs of infection does not mean that it's safe. You could still have unwanted visitors that just haven't produced enough gas to distend the can. How long is variable, it depends on the conditions inside the can. Under "ideal" conditions C. botulinum can double in population every few minutes.
Answer 3
yes, botulism can occur if a jar has a popped up lid. To be safe, everytime you eat canned goods, make sure that you've heated it at 121 °C. It's one way to kill the botulism bacteria. But if a can is already puffed, it's better to just throw it away. Remember that botulism is really dangerous - it can cause permanent paralysis. To make sure that you're not promoting botulism when you're canning, read this do's and don'ts in home canning.
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