title: Active bilayer films of thermoplastic starch and polycaprolactone obtained by compression molding.
abstract: Bilayer films consisting of one layer of PCL with either one of thermoplastic starch (S) or one of thermoplastic starch with 5% PCL (S95) were obtained by compression molding. Before compression, aqueous solutions of ascorbic acid or potassium sorbate were sprayed onto the S or S95 layers in order to plasticize them and favor layer adhesion. S95 films formed bilayers with PCL with very good adhesion and good mechanical performance, especially when potassium sorbate was added at the interface. All bilayers enhanced their barrier properties to water vapour (up to 96% compared to net starch films) and oxygen (up to 99% compared to PCL pure). Bilayers consisting of PCL and starch containing 5% PCL, with potassium sorbate at the interface, showed the best mechanical and barrier properties and interfacial adhesion while having active properties, associated with the antimicrobial action of potassium sorbate.
authors.affiliation: Instituto de Ingeniería de Alimentos para el Desarrollo, Departamento de Tecnología de Alimentos, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain. Electronic address: rodorto@etsiamn.upv.es.
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Ortega-Toro
authors.affiliation: Instituto de Ingeniería de Alimentos para el Desarrollo, Departamento de Tecnología de Alimentos, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain.
authors.forename: Iris
authors.initials: I
authors.lastname: Morey
authors.affiliation: Instituto de Ingeniería de Alimentos para el Desarrollo, Departamento de Tecnología de Alimentos, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain. Electronic address: pautalens@tal.upv.es.
authors.forename: Pau
authors.initials: P
authors.lastname: Talens
authors.affiliation: Instituto de Ingeniería de Alimentos para el Desarrollo, Departamento de Tecnología de Alimentos, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain.
authors.forename: Amparo
authors.initials: A
authors.lastname: Chiralt
mesh_terms: D000269:Adhesives / Q000737:chemistry; D063566:Biodegradable Plastics / Q000138:chemical synthesis* / Q000737:chemistry; D006358:Hot Temperature; D010539:Permeability; D011091:Polyesters / Q000737:chemistry*; D013011:Sorbic Acid / Q000737:chemistry; D013213:Starch / Q000737:chemistry*; D013718:Tensile Strength
chemical_list: D000269:Adhesives; D063566:Biodegradable Plastics; D011091:Polyesters; C016240:polycaprolactone; D013213:Starch; D013011:Sorbic Acid
keywords: Bilayer; Compression molding; Interface; Polycaprolactone; Starch