Properties and applications of antioxidant bilayer films based on fish skin gelatin containing epigallocatechin gallate

Abstract

Bilayer film was successfully prepared by lamination fish gelatin film (GF)with emulsified film (EF) or poly(lactic) acid film (PLAF) via two-steps castingtechnique and thermo-compression technique. Lamination with EF or PLAFlowered water vapour permeability of GF and increased the strength of resultingbilayer film. The incorporation of epigallocatechin gallate (EGCG) into gelatin filmenhanced the antioxidant activity of gelatin film as well as providing the interactionin gelatin film. The bilayer film based on fish gelatin containing EGCG laminatedwith EF or PLAF were applied as pouch or bag for packaging food models such aschicken skin oil (CSO) or striped catfish slice (SCS). Those bilayer films showedthe antioxidant activity by lowering the lipid oxidation of CSO or SCS duringstorage. Therefore, lamination of fish gelatin containing EGCG with emulsified filmor poly(lactic) acid film rendered the active bilayer film with the superior propertieswhich can be used as an alternative material for food packaging.