If you like to can food out of your garden during the late summer and fall during the harvest season, you might be a little concerned about how best to keep mold and other microorganisms from contaminating your food. There are a number of different things that you can do to keep mold from growing in your newly canned food, but some of them might not be as obvious as you might think.
For example, paraffin was commonly used years ago to seal the tops of jars for jellies, jams, or preserves. This is no longer recommended, because mold is a common contaminant of these and it can send “threads” down through the paraffin and end up producing mycotoxins in the food. These soft spreads should be canned as you would anything else.
Food should also be stored properly and at temperatures under about 90 degrees Fahrenheit. Organisms such as mold and bacteria can grow in higher temperatures and foods canned at home that are exposed to high temperatures can get quite hot inside and the air in the top of the jar will expand and break open the seal. The mold or bacteria will get inside the food and bam -- a jar is wasted. All canned foods should be dated and used within one year.
Before you put any food into your jars, they should be thoroughly sterilized first. This is done by filling the jars and the canner up to about 1 inch over the top of the jars with hot water. These should then be boiled for around 10 minutes and for every 1,000 feet over 1,000 feet in altitude, add an extra minute. Remove the jars from the water and drain their contents back into the canner to use for processing the foods, since this water is already sterile. Put the food into the jars, add the lids, and tighten on the screw bands. Some foods are said not to need pre-sterilized jars, but it is better to be safe than sorry, right?
Any food you are going to can should be of good quality, peeled, and thoroughly washed beforehand. Attempting to can any food that is questionable will only result in wasted time and effort.
Food should also not be packed tightly in the jars. Allow some air space between the food and the jar’s lid.
Jars must also not be left in the canner after they are finished processing. As the jars cool off, they can suck in water from the pot and this may contain any number of different spores or microbes. Allow the jars to cool naturally somewhere at room temperature where they will not be bothered.
Showing posts with label canning. Show all posts
Showing posts with label canning. Show all posts
Tuesday, January 22, 2008
Important Information About Mold And Home Canning
Canning vegetables and fruits is a popular summertime activity for a lot of people, especially women in rural areas that have too much of one thing or the other grown in their gardens for their families to eat or for them to give away. Whether it is jams, jellies, marmalades, pickles, soups, or almost anything else, if it can be canned, someone is probably doing it during the harvest season.
A similar process is used in the commercial canning industry, but the boon of doing your own canning from home is that you know exactly what is going into the jar you are putting your food in. You have complete control over everything that goes inside and your exposure to pesticides and chemicals used on the foods in a canning factory is limited to what you use to protect your own garden from bugs and rodents.
Home canning also uses techniques that are tried and true to preserve food and prevent them from being contaminated by mold, yeast, and bacterias. Botulism and other diseases are caused by these contaminants and the canning techniques used to help prevent them are still in widespread use today. What can you do to help prevent your home canned goods from spoiling after you can them..? And how do you know if they’re spoiled after they’ve been on the shelf for a while..?
If you are a canner and have had some problems with spoiled or mold-contaminated jars in the past, then there are a few different things that could be causing your foods to spoil.
The first thing that you need to do is make sure that your fruits or vegetables (or whatever you are canning) is thoroughly washed and of good quality. They also usually require peeling if you want a quicker processing time.
If the food is packed too tight in the jars, then the temperature in the center of the jar does not get high enough for a long enough time to allow for the complete sterilization of what is inside. Pack food loosely in jars and use the time, pressure, and temperature required by the recipe.
Put the lids on the jars after filling them and immediately begin processing the food before any microorganisms can start to grow. Once mold spores get into the jars, you’ll have problems later on because a lot of times high temperatures simply do not kill mold spores, just like cold temperatures don’t tend to. Use sterile equipment and jars.
Lastly, if you find mold growing in one of your jars after you open it, the best thing to do is toss it. Soft foods will become completely contaminated by mold, unlike hard blocks of cheese and other dense foods.
A similar process is used in the commercial canning industry, but the boon of doing your own canning from home is that you know exactly what is going into the jar you are putting your food in. You have complete control over everything that goes inside and your exposure to pesticides and chemicals used on the foods in a canning factory is limited to what you use to protect your own garden from bugs and rodents.
Home canning also uses techniques that are tried and true to preserve food and prevent them from being contaminated by mold, yeast, and bacterias. Botulism and other diseases are caused by these contaminants and the canning techniques used to help prevent them are still in widespread use today. What can you do to help prevent your home canned goods from spoiling after you can them..? And how do you know if they’re spoiled after they’ve been on the shelf for a while..?
If you are a canner and have had some problems with spoiled or mold-contaminated jars in the past, then there are a few different things that could be causing your foods to spoil.
The first thing that you need to do is make sure that your fruits or vegetables (or whatever you are canning) is thoroughly washed and of good quality. They also usually require peeling if you want a quicker processing time.
If the food is packed too tight in the jars, then the temperature in the center of the jar does not get high enough for a long enough time to allow for the complete sterilization of what is inside. Pack food loosely in jars and use the time, pressure, and temperature required by the recipe.
Put the lids on the jars after filling them and immediately begin processing the food before any microorganisms can start to grow. Once mold spores get into the jars, you’ll have problems later on because a lot of times high temperatures simply do not kill mold spores, just like cold temperatures don’t tend to. Use sterile equipment and jars.
Lastly, if you find mold growing in one of your jars after you open it, the best thing to do is toss it. Soft foods will become completely contaminated by mold, unlike hard blocks of cheese and other dense foods.
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