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Prediction Equations for Gases in Flexible Modified‐Atmosphere Packages of Respiring Produce are Different Than Those for Rigid Packages
Author(s) -
TALASILA P. CHOWDARY,
CAMERON ARTHUR C.
Publication year - 1997
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.1997.tb15008.x
Subject(s) - partial pressure , steady state (chemistry) , volume (thermodynamics) , chemistry , permeability (electromagnetism) , atmosphere (unit) , analytical chemistry (journal) , modified atmosphere , polyethylene , materials science , thermodynamics , chromatography , oxygen , organic chemistry , physics , biochemistry , food science , membrane , shelf life
Total pressure generally decreases in a sealed rigid package containing respiring produce, whereas total pressure is essentially constant and free volume decreases in a flexible package. We found that predicted O 2 , CO 2 , and N 2 partial pressures were different for similarly designed (same surface area, thickness, film permeabilities and produce mass) flexible and rigid packages at “quasi steady state” and steady state, respectively. Predicted O 2 and CO 2 partial pressures were slightly higher in a flexible package than in a rigid package and were a function of the film permeability ratio of N 2 to O 2 and of CO 2 to O 2 . They also related to the ratio of product CO 2 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‐density polyethylene.