Influence of Gelatin-Based Coatings Crosslinked with Phenolic Acids on PLA Film Barrier Properties

Single-use plastics are a major source of pollution and biodegradable polymers could be the best substitute, as they possess similar barrier functional properties. Aiming at improving properties providing antioxidant bioactivity, PLA (PolyLactic Acid) films were coated with crosslinked suspension plasticized gelatin incorporating phenolic compounds. The coating process induced weak modifications due to plasticization by moisture glycerol from suspension. Indeed, double glass transition was displayed. water vapor PLA-coated not significantly affected. Phenolic compounds crosslinking network, slightly decreasing sensitivity surface hydrophilicity. Therefore, mechanical maintained after their highly improved, up 600-fold reduction oxygen transfer rate. These results make possible new applications for oxidation-sensitive foods, even semi-moist foods.