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New Polysaccharides-based Smart Polymer Coatings for Packaging

New Polysaccharides-based Smart Polymer Coatings for Packaging2019.11.08

RUDN University chemists have discovered a unique method for polymer coating based on natural polysaccharides. It simultaneously has antioxidant, antimicrobial and barrier properties, and protects the content against ultraviolet exposure. Using the film to package and coat food products will considerably extend their shelf life.




The unique combination and proportions of polymer components make it possible to obtain films with the following properties:
  • Low permeability to water vapor and oxygen,
  • Enhanced mechanic properties: high-tensile strength,
  • Active properties, i.e. apparent antibacterial and fungicidal effects.

The history of production of polymer coatings with protection properties is not new. However, the methods are being improved, thereby enhancing fundamental science. RUDN University chemists developed nanoparticles where the following four properties are combined not separately but altogether: the first one is traditional – barrier property, and the rest are so called active properties: antioxidant, antimicrobial properties and the ones which protect the product against ultraviolet exposure. The basis for polymer coatings is bilayer. 


Smart Coatings with Barrier properties


Traditional packaging has only barrier properties. It includes the packaging we are used to seeing every day: plastic, vacuum one. 
If the packaging has antibacterial properties, protects against ultraviolet exposure, or has any other properties – it is called active. A whole range of chemical “introductions” are carried out to make each of its variations. For example, it makes sense to introduce antioxidants into the packaging if it has antibacterial properties.


Their packaging is not only barrier and active but also smart. This means that it can respond to changes in the environment, for example, to the increase in humidity and temperature which is not acceptable for the film-wrapped product. The wrapping will change color in such cases.


Environmentally Friendly Unique Discovery


Chemists have discovered the method for combining many useful properties altogether: antibacterial, antioxidant, and antimicrobial, as well as smart properties. The same nanoparticles are responsible for all these properties. It is the method that is unique. Moreover, the obtained films are biocompatible, biodegradable. They are absolutely non-toxic. Such films are in line with the global trend of going green – this is real green chemistry, i.e. which is environmentally friendly.


Extending the Shelf Life of Products


The method is environmentally friendly, safe, simple and cost-efficient. It is the first time the most important useful properties for extending the shelf life of products have been combined. The invented compound can be used as the film in which the product will be wrapped: this will not involve its quality changes. Moreover, the immersion method seems promising: as the material is completely safe, the products can be immersed into it, thereby creating a protective film.


Source: RUDN University


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