Model for Gas Exchange Dynamics in Modified‐Atmosphere Packages of Fruits and Vegetables

A model for atmosphere in a package containing fresh fruits was analyzed theoretically and validated by experiments with red bell pepper fruit. The model was based on two processes : fruit respiration and film permeability. Mathematical analysis showed that when rates of O 2 consumption and CO 2 evolution due to respiration are equal, and film permeability to CO 2 is greater than that to O 2 , the time course curve of CO 2 concentration has a maximum. In a closed system, the time course of the sum of the gases could indicate a change of respiratory quotient. These results are independent of model for respiration. To predict extent of overshoot and for a computerized simulation, the equation of Michaelis-Menten type with noncompetitive inhibition was adopted to describe respiration. Utilizing computer simulations enabled evaluation of film specifications and package dimensions best for a given commodity.

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