The Use of Gas Permeability as a Molecular Probe for the Study of Cross‐linked Collagen Structures*

Hydrophilic Edible Films: Modified Procedure for Water Vapor Permeability and Explanation of Thickness Effects

“…Hauser and McLaren (1948) reported exponential relationships between permeability and relative humidity for polyvinyl alcohol, cellulose acetate, and nylon hydrophilic films. Lieberman et al (1972) observed similar effects for collagen based edible films. They reported that both water sorption and carbon dioxide permeability varied exponentially with RH conditions of the test.…”

Water relations of tetrapod integument

“…Dehydration reduces permeability not only by reversing these effects but also by promoting noncovalent bondings between protein chains (Vincent and Hillerton, 1979). Consequently, the permeability of dry protein films can be extremely low (Lieberman et al, 1972), presumably enhancing water resistance in comparatively dry tissue.…”

“…Generally, structural features that alter the free volume (equivalent to pores or channels) should alter the permeation of water molecules accordingly. Resistance to diffusion is affected by the molecular mass of side chains and tends to increase with cross-linking beyond certain critical levels (Lieberman et al, 1972). However, proteins with bulky, globular side chains may inhibit close packing of molecules and thereby diminish the resistance of a complex membrane.…”

Caracterização estrutural e da capacidade de absorção de água em filmes finos de quitosana processados em diversas concentrações

“…As características da absorção de água encontradas nos filmes de quitosana são perfis similares aos apresentados por Lieberman et al [28] , para filmes baseados em colágenos.…”