Modified Atmosphere Packaging (MAP) is based on the alteration in the composition of gases around the certain commodity within the sealed package. Elevation in the CO2 level along the decreased O2 level in the package result in a decreased respiration rate of the stored fruits and vegetables and extension of the physiological life.
MAP packages discharges the released ethylene gas from the modified atmosphere, eliminating the possibility of decay, spoiling, ageing, and maturing. The MAP packages enrich the modified atmosphere by providing the optimum relative humidity, and completely prevents loss of weight. However, it never produces a waterlogged atmosphere that would cause microbial spoilage of fresh products.
The level of gases accumulated in the MAP package is produced by respiratory rate of the product, storage temperature, ratio of product weight to the semipermeable film area, and other several factors. The polymer engineers developing MAP packages have ensured MAP to be more competitive and successful in the fresh product market by enabling critical developments. The film has very unique characteristics.