Abstract
Biodegradable packaging materials are already in use. However, there are severe restrictions preventing the broad application in food packaging, especially due to insufficient barrier properties. Our idea was to improve these properties with a biodegradable coating. The Fraunhofer-Institut für Silicatforschung ISC has been developing high-barrier coatings for various packaging applications based on a class of materials with glass-like structural units, named ORMOCER®. However, these state-of-the-art ORMOCER® coatings are not biodegradable. The aim of our work was to modify ORMOCER® to become biodegradable and, at the same time, preserve the barrier and functional properties. This was achieved by the incorporation of functionalized tamarind hemicellulose Glyate® into the ORMOCER® matrix. For this purpose a two-step amination reaction of Glyate® was chosen. The aminated product was analyzed by FTIR, solid-state NMR and elemental analysis. New aminated Glyate® containing bioORMOCER® lacquers could be synthesized. Lacquer quality assessment was performed by Raman spectroscopy. The properties of the resulting coatings were evaluated by laser scanning microscopy (LSM), oxygen transmission rates (OTR) measurements, E-Module determination and adhesion tests. Standardized tests for compostability, overall migration and antimicrobial properties were performed for the bioORMOCER® coatings. The evaluation showed that the new bioORMOCER® coatings are suitable for sustainable food packaging.
Highlights
IntroductionFresh food as well as convenience food reaches customers usually packaged. Hygienic conditions, long shelf life and easy availability of these packaged products in almost every moment of daily life account for a large share of our living standard.Flexible packaging is the most economical method to package, preserve and distribute food, beverages, consumables, cosmetics, pharmaceuticals and other products that need extended shelf life
Nowadays, fresh food as well as convenience food reaches customers usually packaged
The results demonstrated that both bioORMOCER® films fulfilled the requirements for biodegradation and can be described as biodegradable under controlled composting conditions
Summary
Fresh food as well as convenience food reaches customers usually packaged. Hygienic conditions, long shelf life and easy availability of these packaged products in almost every moment of daily life account for a large share of our living standard.Flexible packaging is the most economical method to package, preserve and distribute food, beverages, consumables, cosmetics, pharmaceuticals and other products that need extended shelf life. Fresh food as well as convenience food reaches customers usually packaged. Long shelf life and easy availability of these packaged products in almost every moment of daily life account for a large share of our living standard. Flexible packaging is the most economical method to package, preserve and distribute food, beverages, consumables, cosmetics, pharmaceuticals and other products that need extended shelf life. According to a market report by Smithers, the global demand for flexible packaging is projected to reach $283 billion in 2022, with an annual growing rate of 4.3% [1]. Food and cosmetic products wrapped in single servings are an enormous waste of packaging material and of resources. About 17% of the world’s film production is based on multilayer films [2]
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