Two-Layer Functional Coatings of Chitosan Particles with Embedded Catechin and Pomegranate Extracts for Potential Active Packaging.

Sanja Potrč,Alenka Vesel,Tjaša Kraševac Glaser,Nataša Poklar Ulrih,Lidija Fras Zemljič

doi:10.3390/polym12091855

Sanja Potrč, Alenka Vesel + Show 3 more

Open Access

https://doi.org/10.3390/polym12091855

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Abstract

Two-layer functional coatings for polyethylene (PE) and polypropylene (PP) films were developed for the active packaging concept. Prior to coating, the polymer films were activated by O2 and NH3 plasma to increase their surface free energy and to improve the binding capacity and stability of the coatings. The first layer was prepared from a macromolecular chitosan solution, while the second (upper) layer contained chitosan particles with embedded catechin or pomegranate extract. Functionalized films were analyzed physico-chemically to elemental composition using ATR-FTIR spectroscopy and XPS. Further, oxygen permeability and wettability (Contact Angle) were examined. The antimicrobial properties were analyzed by the standard ISO 22196 method, while the antioxidative properties were determined with an ABTS assay. Functionalized films show excellent antioxidative and antimicrobial efficacy. A huge decrease in oxygen permeability was achieved in addition. Moreover, a desorption experiment was also performed, confirming that the migration profile of a compound from the surfaces was in accordance with the required overall migration limit. All these properties indicate the great potential of the developed active films/foils for end-uses in food packaging.

Highlights

Packaging innovations around the world are diverse and very dynamic
It was assumed that Chitosan Nanoparticles (CSNPs) with incorporated extracts will have a higher hydrodynamic diameter, which was proved here
This paper presents modifications of PEby and PP foils the for foils the with development of active applying coatings consisting of a thin film of 2%

Summary

Introduction

Packaging innovations around the world are diverse and very dynamic They concern the materials to be used, filling and packaging technologies, esthetic aspects, and communication and information issues [1]. Some of these innovations are considered outstanding in terms of reducing resource consumption and improving sustainable packaging. The concepts for the development of active packaging that helps to extend the shelf life and, minimize food waste, are of great importance. Many of these active packaging materials have been developed through surface coatings that improve the functionality of food products and enhance the nutritional and sensory properties of food (in response to the requirements of different consumer niches and markets) [4,5,6]

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