preparation and characterization of a bio-nano-polymer film for walnut packaging

To apply the nanomaterial as a component in the packaging material structure, in this research, the carboxymethyl cellulose (cmc)/polyvinyl alcohol (pva) films were prepared with three levels of nanoclay particles (0.5, 1 and 3%) using solution casting evaporation method. the effect of incorporation of nanoclay on mechanical, water vapor permeability and oxygen barrier properties of cmc/pva-based film was investigated. the best result was obtained for the nanocomposite film containing 3% nanoclay. in the next step, the cmc/pva/nanoclay films were employed for walnut packaging. after 90 days storage in the environmental condition, the optimum result was found for the nanocomposite film with 3% nanoclay in terms of oil content, moisture content, acidity and peroxide indexes of walnut. according to the overall results, the cmc/pva film reinforced with 3% nanoclay could be presented as a good candidate for the development of high barrier food packaging material against the diffusion of water vapor and oxygen.