Biopolymer-Based Multilayer Films and Coatings for Food Preservation: an Update of the Recent Development

Abstract

Biopolymers present appealing properties such as gas barrier abilities and biodegradability, which can be used to develop multilayer films for food preservation applications. This article provides an update on the recent research progress on biopolymer-based multilayer films. Various multilayer films have been developed based on biopolymers and their combination with other biodegradable polymers (e.g., PLA, PCL, and PVA), organic compounds (e.g., lauroyl arginate ethyl, carvacrol, natural plant extracts, and essential oils), and inorganic particles (e.g., nanoclays, silver, and metal oxides). These multilayer films present enhanced properties and functions such as barrier performance against gas, water, oil, and UV light, antimicrobial and antioxidant activities, and pH indication. This article overviews the design principles and fabrication methods for multilayer films, their properties and functions, and specific food packaging applications. The current challenges and future perspectives in this area are also proposed.