Modes Of

There are two modes of MAP—passive and active (7). Passive MAP involves placing the plant tissue in a selectively gas-permeable polymeric package, hermetically sealing the package, and then allowing tissue aerobic respiration to reduce oxygen and increase carbon dioxide concentrations inside the package to a desired steady-state equilibrium. Active MAP involves placing the plant tissue in a selectively gas-permeable package, evacuating the package atmosphere, and replacing it by flushing the unsealed package with a specific mixture of oxygen, carbon dioxide, and nitrogen gases (8) followed by rapid sealing of the package. The flushing gas composition is usually selected to provide optimum levels of oxygen and carbon dioxide (with a balance of nitrogen) to immediately diminish aer obic respiration rate of the particular tissue system being packaged. Active MAP may also include the utilization of absorbers or adsorbers placed inside the package to scavenge oxygen, carbon dioxide, ethylene (5), and water vapor as well as the use of antimicrobial agents such as carbon monoxide. The goal of passive and active MAP design is to achieve a balance between the enclosed plant tissue respiration rate and package gas permeability to attain or maintain an acceptable equilibrium atmosphere within the package; that is, a MA that will delay ripening/ senescence and thereby extend product shelf life.

The Mediterranean Diet Meltdown

The Mediterranean Diet Meltdown

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