Non-Thermal Preservation

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Non-Thermal Preservation
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Definition

• Involves manipulating the properties of food or
  its environment without using heat.
• Examples include
• Irradiation
• Ohmic heating
• Ozonation
• High pressure processing

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Irradiation

• Exposure of food to ionizing radiation for
  preservation
• In the U.S. irradiated foods are required to be
  labeled.

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Ohmic Heating

• Food is subjected to an alternating current flow
  between two electrodes.

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Ozonation

• Water treatment process used to destroy
  microorganisms by ozone, a gas produced by
  exposure of oxygen molecules to high electric
  voltage

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High Pressure Processing

• Preservation method where liquid and solid foods
  are subjected to pressures of 45,000 pounds per
  square inch or higher.