Active caseinate/guar gum films incorporated with gallic acid: physicochemical properties and release kinetics

Composite active films based on sodium caseinate/guar gum were prepared by the incorporation of gallic acid at different concentrations to investigate its effect on the structure, physicochemical properties, and the release kinetics from the film. Water vapor permeability (WVP) of films decreased up to 21% after the incorporation of gallic acid in the film. The gallic acid released from the films GAI*60 ug.ml-1, GAII*250 ug.ml-1 and GAIII*650 ug.ml-1 was 67 %, 32 % and 30 % respectively. Similarly, the diffusion coefficient was also affected by an increase in the concentration and was: 8.10 ×10-12 m2s-1, 6.23 ×10-12 m2s-1, and 4.5 ×10-12 m2s-1 for GAI, GAII and GAIII films respectively.