Abstract
The study focused on the elaboration and the characterization of blend biofilms based on European eel skin gelatin (ESG) and protein isolate (EPI) and the assessment of European oil (EO) incorporation effect on their properties. Data displayed that the incorporation of EPI and EO to the gelatin formulation decreased the lightness and yellowness of composite and emulsified films, respectively, compared to ESG film. Moreover, ESG films exhibited improved mechanical properties than EPI films. FTIR analysis, all incorporated films with EO at the ratio 1:4 (oil/polymer) revealed similar characteristic bands as in free-oil films. Further, the SEM images of 100% ESG and 100% EPI films showed a smooth and homogenous structure, whereas the cross-section of blend film (at a ratio 50:50) displayed a rougher microstructure. In addition, emulsified film ESG100 revealed a smooth and homogeneous microstructure compared to that prepared using EPI/ESG 50/50 ratio. Furthermore, EPI or EO addition into the ESG matrix enhanced the blend films antioxidant activities.
Highlights
In order to reduce environmental pollution and to conserve fuel reserves, the biodegradable packaging based on safe biopolymers has been investigated in many researches [1]
A characterization of blend biofilms based on European eel skin gelatin (ESG), protein isolate (EPI), and oil (EO) was released
The gelatin-based film displayed the highest tensile strength, The antioxidant potential of enriched films comes from the bioactivity of the incorporated substances, which have proved their antioxidant effect as electron donors and chelating agents [49]
Summary
In order to reduce environmental pollution and to conserve fuel reserves, the biodegradable packaging based on safe biopolymers has been investigated in many researches [1]. Films based on eco-friendly biopolymer displayed advantageous properties compared to the traditional plastics, favoring their potential application, mainly their biocompatibility, non-toxicity, availability, and biodegradability [2]. Biopolymer-based films behave as selective barriers to oxygen diffusion, lipid oxidation, moisture transfer, and loss of volatile aroma compounds which improve food shelf-life and quality [3]. Various biopolymers, such as proteins, polysaccharides, and lipids, could be used to produce biodegradable films [4,5,6]. Fish protein isolate extracted by alkaline solubilization could be a potential alternative for films properties enhancement [9]
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