Canning

Canning

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Making salmon cans

Canning is a method of preserving food in which the food contents are processed and sealed in an airtight container. Canning provides a shelf life typically ranging from one to five years, although under specific circumstances, it can be much longer.

History

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Early canning methods

The process of canning was first developed in the late 18th century as a way to preserve food for the military. The French government offered a cash prize for a new method of preserving food, which was won by Nicolas Appert, who developed a method of sealing food in glass jars. This method was later adapted to use tin cans, which were more durable and easier to transport.

Process

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Canned foods

The canning process involves placing foods in jars or cans and heating them to a temperature that destroys microorganisms and inactivates enzymes. This heating and subsequent cooling forms a vacuum seal. The vacuum seal prevents other microorganisms from recontaminating the food within the jar or can.

Steps

1. Preparation: The food is prepared by cleaning, peeling, chopping, or cooking as necessary. 2. Filling: The prepared food is placed into jars or cans. 3. Sealing: The containers are sealed with lids or caps. 4. Processing: The sealed containers are heated to a specific temperature for a set period of time. 5. Cooling: The containers are cooled, creating a vacuum seal.

Types of Canning

File:Cannery worker filling tuna cans, Los Angeles Cannery Co., Long Beach, Ca. (4951753662).jpg

Cannery worker filling tuna cans

There are two main types of canning: water bath canning and pressure canning.

Water Bath Canning

This method is used for high-acid foods such as fruits, pickles, and tomatoes. The jars are submerged in boiling water for a specified time.

Pressure Canning

This method is used for low-acid foods such as vegetables, meats, and seafood. The jars are placed in a pressure canner, which allows the temperature to rise above boiling.

Industrial Canning

Artashat Cannery

Industrial canning is a large-scale operation that involves automated machinery to fill, seal, and process cans. This method is used to produce canned goods for mass distribution.

Home Canning

Home canning is a popular method for preserving food at home. It allows individuals to preserve seasonal produce and create homemade jams, jellies, and pickles.

Safety

Canning is a safe method of food preservation if done correctly. It is important to follow proper canning procedures to prevent the growth of Clostridium botulinum, which can cause botulism, a potentially fatal illness.

Related Pages

• Food preservation
• Pickling
• Fermentation
• Clostridium botulinum

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