Mathematical Model of Gas Exchange for Modified Atmosphere Packaging Containing Pak-choi

摘要

Respiration became the dominant aspects of metabolism after vegetables were harvested. The mainfactors affecting respiration are temperature and gas concentration of the storage environment. It is a majorchallenge that how to choice a plastic film with appropriate permeability coefficient for specific varieties vegetablesin specific temperature. Therefore, it is the key of modified atmosphere packaging technology of vegetablesthat to establish mathematical model of gas exchange for modified atmosphere packaging (MAP).Based on the dynamic equilibrium theory of MAP, the variation laws of respiration rates were studied withthe dynamic changes of O2 and CO2 concentration within packages at 10℃ and 20℃ respectively. The optimalsimulated function expression was established. The experimental data were analyzed with SPSS for windowsstatistical software. The mathematical model of gas exchange within close packages was developedwhen the modified atmosphere packaging for Pak-choi was designed. The theoretical basis for getting a rightway to choose packaging materials for MAP and predicting the gas mass concentrations inside the packageswere provided.The correctness of model was verified by MAP experiments containing Pak-choi.