Daegu University, Mokpo National University, Korea Food Research Institute, Korea
Dr. Jun Ho Lee (Professor in Food Engineering, Daegu University)
Edible films can improve food quality, extend shelf-life, add some beneficial functional properties to foods and reduce the use of synthetic packaging materials. They can prevent moisture, as well as prevent oxidation, aroma or color migration by separating layers for heterogeneous foods, such as pizza, apple pie, or pouching some dry food ingredients. For application of films to food systems, it is important to develop films possessing favorable mechanical and permeability characteristics.
Composite films can be formulated to combine the advantages of polysaccharides and proteins, and lessen the disadvantages of each. On the contrary, the films should possess low water vapor permeability (WVP) and high mechanical properties. In the case of an optimization study for edible film formation, minimization of WVP and maximization of mechanical properties need to be achieved at the same film-forming conditions. Published information on the optimization of film properties is rather scarce. Knowledge of the optimum point can be used to design new film formulations for specific applications.
Recently, due to the serious environmental pollution caused by plastic wastes, much interest has been placed by researchers and industries on the environment-friendly packaging, which can be decomposed by soil microorganisms. Several researches on various biodegradable films have been actively performed on food packaging with various biodegradable films developed from carbohydrates, proteins, lipids, and their mixtures. However, literature review indicated that no information related to the properties such as mechanical, moisture barrier, and antioxidant properties of alginate/GSE composite films is available.
In this study, biodegradable films were produced by composting sodium alginate and grapefruit seed extract (GSE) which has shown some beneficial functional properties. Different concentrations of GSE were added, and its mechanical, moisture barrier properties (transmittance, water vapor permeability, tensile strength, water solubility) and antioxidant properties (DPPH and ABTS radical scavenging activity) were determined and compared.