Chitosan based edible films and coatings: A review

Chitosan is a biodegradable biocompatible polymer derived from natural renewable resources with numerous applications in various fields, and one of which is the area of edible films and coatings. Chitosan has antibacterial and antifungal properties which qualify it for food protection, however, its weak mechanical properties, gas and water vapor permeability limit its uses. This review discusses the application of chitosan and its blends with other natural polymers such as starch and other ingredients for example essential oils, and clay in the field of edible films for food protection. The mechanical behavior and the gas and water vapor permeability of the films are also discussed. References dealing with the antimicrobial behavior of these films and their impact on food protection are explored.

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► Chitosan is a natural polymer extracted from chitin, the second most abundant polymer.
► Chitosan has antibacterial and antifungal properties and is used for food protection.
► Blending chitosan with different origins of starch increases its mechanical properties.
► Antimicrobial films can be made from chitosan blended with essential oils and clays.
► Chitosan films with different combinations can increase the shelf life of food.