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first test the kinetic coefficient values decreased hugely and in the following order: OPP (0.75 – 0.17), LDPE(0.64 – 0.18) and PET (0.42 – 0.22). However, edible-coated films showed lower optical performances in termsof transparency and haze. Transparency decreased mainly for LDPE (36%), whereas the haze index increasedabove all for OPP (85%). Not significant differences were observed as far as the water vapour permeability isconcerned, except for a slight reduction for PET (from 15.78 cm 3 m -2 day -1 to 13.53 cm 3 m -2 day -1 at 23°C and90% of RH), suggesting that not meaningful effects arose from the addition of a hydrophobic component in theoriginal formulation. Finally, the solubility in water of the coating was around 25% for all the three plastic filmsas substrates. The obtained data suggest that the lipid-protein edible coating tested in this study has a great potentialfor improving the most important characteristics of plastic packaging films.2. Farris S., Piergiovanni L., Ronchi G., Rocca R. 2008 International Patent WO 2008/075396A1: “Edible Matrices and Relevant Applications and Preparation Method”.The present invention relates to edible matrices, intended for the protection of foodstuffs and for coating differentsubstrates (i.e. synthetic, artificial, natural materials) such as films and containers (even siliceous) for packagingapplications.SISTAL - SOCIETA’ ITALIANA DI SCIENZE E TECNOLOGIE ALIMENTARIDipartimento di Scienze e Tecnologie Agroalimentari, Università degli Studi della TusciaVia San Camillo de Lellis, 01100 ViterboTel.: 0761- 35 74 94/7 , Fax: 0761- 35 74 98, e-mail: mmoresi@unitus.it228