Study of the gastrointestinal diffusion system (GDS): influence of acacia gum on mechanical and chemical properties in free cellulose acetate films.

In this work a study of free cellulose acetate films was carried out in the presence and absence of acacia gum at high concentrations (50 and 75%). The mechanical toughness and the aspect were influenced by operatory conditions and by the relative air humidity. The increase of relative humidity from about 0% to 75% decreased the mechanical toughness and the color film changed from a clear to opaque white. The presence of acacia gum decreased the mechanical toughness and the water vapour transmission rate and increased the film water solubility.