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By 0 | This article was posted on 2007-10-03 04:49:36

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Canning is a method of preserving food by first sealing it in air-tight jars, cans or pouches, and then heating it to a temperature that destroys contaminating microorganisms. Because of the danger posed by Clostridium botulinum (the causative agent of botulism) and other pathogens, the only safe method of canning most foods is under conditions of both high heat and pressure, normally at temperatures of 240-250°F (116-121°C). Foods that must be pressure canned include most vegetables, meats, seafood, poultry, and dairy products. The only foods that may be safely canned in a boiling water bath (without high pressure) are highly acidic foods with a pH below 4.6[1], such as fruits, pickled vegetables, or other foods to which acid has been added.

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