Nanopolysaccharides in barrier composites

Abstract

The purpose of a barrier layer or film in a packaging product is to slow down or essentially eliminate the progress of oxygen, water vapor, or other molecules, thereby extending the shelf life, safety, and maybe also the taste of products—especially in the case of foods. This chapter discusses progress in the preparation of barrier composite films that include nanopolysaccharides, such as nanochitin, nanostarch, and nanocellulose. The reviewed research shows that these eco-friendly components in the resulting films often can improve barrier properties. While nanocellulose has attracted more research attention, nanostarch particles can be prepared under less aggressive chemical conditions, and particles related to chitin might possibly be preferred when one of the goals is to achieve antimicrobial effects. Nanopolysaccharides are also likely to find future applications in barrier films containing montmorillonite clay (nanoclay) and in multi-layer barrier film systems.