A respiration model, based on enzyme kinetics, was proposed for predicting respiration rates of fresh produce as a function of O2 and COZ concentrations. In this model, the dependence of respiration on O2 was assumed to follow a Michaelis-Menten type equation (r = V,[O,]/{K,,, + [O,]}), and the effect of CO2 on respiration to follow an uncompetitive inhibition model (r = V,[O,]/{& + (1 + [COZ]/ Ki) [O,]}). The model predictions agreed well with published data for a variety of commodities and with experimental data for cut broccoli.Fresh produce respiration rates (0, consumption or CO2 evolution) at various O2 and CO* concentrations, as well as transient and equilibrium gas concentrations within permeable packages, could be accurately predicted with the model equations.

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