Título: Active Starch-Polyester Bilayer Films with Surface-Incorporated Ferulic Acid
Autor: Hernandez-Garcia, Eva; Vargas, Maria; Chiralt, A.
Resumen: [EN] Bilayer films of cassava starch-based (with 10% gellan gum) and polylactic (PLA): Poly(3-
hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) polyester blend (with 75% PLA) monolayers were
obtained by melt-blending and compression-molding, and the subsequent thermocompressing of
both monolayers. Ferulic acid (FA) was incorporated into the polyester sheet by spraying and drying.
Films were characterized in terms of their microstructure and functional properties throughout two
months of storage at 25 ¿C and 53% relative humidity. The laminates exhibited improved tensile and
barrier properties compared to the respective monolayers, which makes them more adequate for food
packaging purposes. Surface incorporation of ferulic acid did not significantly modify the barrier
and mechanical properties of the films while providing them with antioxidant and antibacterial
capacity when applied in aqueous systems, where a complete release of active compounds occurred.
The physical properties of the bilayers and layer thermo-sealing were stable throughout storage.
Likewise, the antioxidant and antimicrobial active properties were preserved throughout storage.
Therefore, these active bilayers represent a sustainable packaging alternative to non-biodegradable,
non-recyclable synthetic laminates for food packaging purposes, which could extend the shelf-life of
food due to their antioxidant and antibacterial properties.