摘要：This paper reviews the importance of the permeability characteristic of packaging materials to some gases for modified atmosphere packaging (MAP) and its application to fruit and vegetables storage. The respiration rates of the some fruits and vegetables are reviewed in relation to MAP. MAP has been developed and used commercially throughout the world to extend shelf life and reduce shrinkage, weigh loss and the development of various blemishes of fruit and vegetables. The choice of films used in this technique is extensive but polyethylene of various densities and thickness is the main one used. The permeability of a particular film depends on the nature of the gas, the polymeric structure and thickness of the film, storage temperature and relative humidity. During the packaging these factors should be considered. Selection of film is also very important in terms of equilibrium rate of respiration inside the package. There is a danger that CO2 will increase and O2 decrease to levels which will damage the produce within the package. An ideal film must let more CO2 exit that O2 enter. CO2 permeability of film should be 3-5 times greater than the O2 permeability.
