Edible films can be prepared from protein, polysaccharide and lipid materials. Among them, proteinbased
edible films are the most attractive. These films have impressive gas barrier properties compared with
those prepared from lipids and polysaccharides. The mechanical properties of protein-based edible films are
also better than those of polysaccharide and fat-based films because proteins have a unique structure (based on
20 different monomers) which confers a wider range of functional properties, especially a high intermolecular
binding potential. However, the poor water vapor resistance of protein films and their lower mechanical strength
in comparison with synthetic polymers limit their application in food packaging. Hence, improvement of edible
protein film properties has been investigated to seek suitable applications. The objective of this review is to
provide a detailed enhancement of the properties of edible protein film through using various methods such as
modifying the properties of protein by chemical and enzymatic methods, combining them with hydrophobic
material or some polymers, or using a physical method. These methods focus primarily on improving the
mechanical strength and moisture barrier properties.