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What is the difference between MAP and EMAP

Modified Atmosphere Packaging (MAP) and Equilibrium Modified Atmosphere Packaging (EMAP) are both food preservation techniques that extend shelf life by modifying the atmosphere within a package. MAP involves actively replacing the air with a specific gas mixture, while EMAP relies on the natural respiration of the product and the permeability of the packaging material to achieve a balanced atmosphere. In essence, MAP is an active process, and EMAP is a passive one.

Modified Atmosphere Packaging (MAP)

Active Gas Replacement: MAP involves actively replacing the air inside a package with a controlled mixture of gases, typically nitrogen, carbon dioxide, and sometimes oxygen.
Goal: To create an atmosphere that inhibits microbial growth and oxidative reactions, thus slowing down spoilage and extending shelf life.
Examples: Used for a wide variety of products including fresh produce, meat, poultry, seafood, and baked goods.
Film Type: Often uses gas-tight films to maintain the modified atmosphere.
Active MAP: Involves actively introducing a specific gas mixture into the package.
Equilibrium Modified Atmosphere Packaging (EMAP) Passive Gas Exchange:

EMAP relies on the natural respiration of the product and the permeability of the packaging material to establish an equilibrium atmosphere within the package. Goal:

To achieve an optimal balance of gases that slows down spoilage and maintains product quality. Examples:

Commonly used for fresh-cut produce, salads, and fruits. Film Type:

Often uses permeable films with micro-perforations to allow for gas exchange.
Film Selection:

Requires careful selection of film material to match the product's respiration rate.

Balance:

The goal is to balance the product's respiration with the film's permeability to maintain a favorable atmosphere. Key Differences:

Feature	MAP	EMAP
Gas Introduction	Active gas replacement	Passive gas exchange based on respiration and film permeability
Packaging Material	Can be gas-tight or permeable	Typically permeable, often with micro-perforations
Gas Balance	Controlled by gas mixture	Achieved through equilibrium between respiration and permeability

In essence: MAP is a more controlled, active process, while EMAP is a passive process that relies on the natural characteristics of the packaged product and the packaging material. Both techniques offer benefits in terms of extending shelf life and maintaining product quality.

Industry News

What is the difference between MAP and EMAP

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