Preparation and Characterization of an Olive Flounder (Paralichthys olivaceus) Skin Gelatin and Polylactic Acid Bilayer Film

Abstract

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 g·m/m ·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.

Antimicrobial activity of buckwheat starch films containing zinc oxide nanoparticles against Listeria monocytogenes on mushrooms

“…Water solubility and moisture content WS was determined as described by Lee & Song (2017) with minor modifications. In brief, the BS/ZnO-N films (2 9 2 cm) were dried at 105°C for 24 h, and then, the films were weighed (initial dry weight).…”

Sea Squirt Shell Protein and Polylactic Acid Laminated Films Containing Cinnamon Bark Essential Oil

“…However, the lamination of the PLA film to the SSP film significantly decreased the WVP to 0.91 ± 0.16 × 10 −9 g m/m 2 s Pa, which is similar to the PLA film alone. It has been reported that multilayer (PLA/fish skin gelatin/PLA) and bilayer (fish skin gelatin/PLA) films exhibited decreases in the WVP by laminating PLA to gelatin films (Hosseini et al., ; Lee & Song, ). Soy protein isolate and PLA‐laminated films also had decreases in the WVP with increasing PLA concentrations (González & Igarzabal, ; Rhim et al., 2017).…”

“…The SSP/PLA-laminated films had a medium value (23.9 ± 0.93%) of SSP and PLA films, and the addition of CBO decreased the water solubility from 23.9 ± 0.93% to 20.6 ± 1.32%. In the report of fish skin gelatin/PLA bilayer films, the water solubility had a similar trend (Lee & Song, 2017). However, it should be noted that the fish skin gelatin multilayer film with PLA as an outer layer had a more decreased water solubility than that of the bilayer film because it was more difficult for water molecules to permeate the PLA layer and dissolve the film (Hosseini et al, 2016).…”

“…The WVP of the SSP/PLA-laminated films was measured ( Table 2). The WVP of the SSP film was 5.62 ± 0.23 × 10 −9 g m/m 2 s Pa, which was higher than that of a typical fish skin gelatin film (2.17 × 10 −9 g m/m 2 s Pa) (Lee & Song, 2017). However, the lamination of the PLA film to the SSP film significantly decreased the WVP to 0.91 ± 0.16 × 10 −9 g m/m 2 s Pa, which is similar to the PLA film alone.…”

“…To improve the physical and water barrier properties of natural polymer films, polylactic acid (PLA) has been laminated to the films (Gartner, Li, & Almenar, 2015;Lee & Song, 2017). PLA is biodegradable, cost-effective, and can be mass-produced (Yahyaoui, Gordobil, Díaz, Abderrabba, & Labidi, 2016).…”