Modified atmosphere packaging

Modified atmosphere packaging, or MAP, is a packaging technique used primarily to extend the shelf life of foods by replacing the air inside a package with a tailored gas mixture, typically nitrogen, carbon dioxide, and sometimes oxygen. It slows microbial growth and oxidation in fresh meat, poultry, seafood, salads, bakery goods, cheese, and snacks. Success depends on matching the gas mix to the product, using high-barrier films that hold the atmosphere, and maintaining the cold chain, since the package only works as designed at the right temperature. MAP is not a substitute for hygiene: gas mixes must be validated so that pathogens such as Clostridium botulinum cannot grow undetected.