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At low relative humidity (RH), an edible wheat gluten film presents very low oxygen and carbon dioxide permeabilities 1.24 and 7.4 amol/(Pa m s), respectively, at 25 °C. For higher than 60% RH, O 2 and CO 2 permeabilities increase exponentially to 1290 and 36 700 amol/(Pa m s), respectively, at 95% RH, presumably due to the plasticizing effect of water molecules. Pectin, chitosan, pullulan, and myofibrillar protein films are also very permeable to O 2 and CO 2 at high RH. The selectivity ratio (CO 2 /O 2 permeability) of all films tested at high RH was very high (from 10 to 28) as compared to conventional synthetic films (4 to 6). Keywords: Edible film; gas permeability; relative humidity
Gontard et al. (Mon,) studied this question.
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