Pc. Talasila et Ac. Cameron, PREDICTION EQUATIONS FOR GASES IN FLEXIBLE MODIFIED-ATMOSPHERE PACKAGES OF RESPIRING PRODUCE ARE DIFFERENT THAN THOSE FOR RIGID PACKAGES, Journal of food science, 62(5), 1997, pp. 926-930
Total pressure generally decreases in a sealed rigid package containin
g respiring produce, whereas total pressure is essentially constant an
d free volume decreases in a flexible package. We found that predicted
O-2, CO2, and N-2 partial pressures were different for similarly desi
gned (same surface area, thickness, film permeabilities and produce ma
ss) flexible and rigid packages at ''quasi steady state'' and steady s
tale, respectively. Predicted O-2 and CO2 partial pressures were sligh
tly higher in a flexible package than in a rigid package and were a fu
nction of the film permeability ratio of N-2 to O-2 and of CO2 to O-2.
They also related to the ratio of product CO2 production rate to O-2
uptake rate, target steady-state O-2 partial pressure, and respiration
characteristics. Differences were slight for films such as low-densit
y polyethylene.