Resumen de Preparation and Characterization of an Olive Flounder (Paralichthys olivaceus) Skin Gelatin and Polylactic Acid Bilayer Film
Olive flounder skin gelatin (OSG) was used as a film base material. A bilayer film of OSG and polylactic acid (PLA) was prepared using solvent casting method to enhance the film properties. Physical properties of the OSG–PLA film were increased compared with the nonaugmented OSG film. In particular, the PLA lamination decreased water vapor permeability from 2.17 to 0.92 × 10−9g·m/m2·s·Pa, as well as of the water solubility from 16.62% to 9.27%, in the bilayer film relative to the OSG film. The oxygen permeability of the OSG–PLA bilayer film was held low by the OSG film, compensating for the high oxygen permeability of the PLA layer. Therefore, the OSG–PLA bilayer film with its enhanced physical properties and high water and oxygen barrier properties can be applied as a food packaging material. Most of fish skin generated during fish processing have been discarded. Fish skin gelatin has been used as a film source. In this study, olive founder skin gelatin films had desirable water barrier property and physical properties by polylactic acid lamination and the developed films are applicable in the packaging industry.
