Abstract
Nanocomposite materials based on bio-polyesters (PBSA and PHBV) have been evaluated for their suitability for food contact according to the recommendations defined for non-biodegradable plastic materials, and subsequently, according to accelerated aging treatment. On the basis of the limited number of material/migrant/food simulant combinations studied here, the test for migration, using food simulants, appeared directly applicable to testing such materials which are not considered humidity-sensitive materials. Considering the only compliance criterion that must be met by the materials in contact, the materials submitted to the aging processing are not of safety concern and the incorporation of nanoclays in aged biodegradable materials does not interfere with their inertial properties in a dramatic way. At the molecular scale, the UV irradiation proved to induce an increase in the degree of crystallinity, resulting in a modification of transport properties of both packaging materials. The values of overall migration and specific migration were reduced without decreasing the diffusion coefficients of the target additives. The UV treatment and the addition of nanoparticles, therefore, seem to jointly promote the retention of organic compounds in the materials by increasing their affinity for packaging material.
Highlights
In the face of growing environmental concerns, new alternative materials must be proposed, especially for short-term applications like food packaging
This work aims to evaluate the food contact suitability of two distinct biodegradable polyesters (PBSA and PHBV) after accelerated aging (UV, humidity and temperature) and to determine if the recommendations established for non-degradable materials can be applicable to the particular case of biodegradable materials
From a practical point of view, these results provide the basis of the recommendations related to the assessment of migration from these results provide the basis of the recommendations related to the assessment of migration from biodegradable materials
Summary
In the face of growing environmental concerns, new alternative materials must be proposed, especially for short-term applications like food packaging. In this context, biodegradable polymers made with bio-sourced resources are considered as promising materials. Aliphatic polyesters such as poly(butylene succinate-co-butylene adipate) (PBSA) and poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV) appear as interesting candidates to replace conventional non-degradable polymers. In addition to their biodegradability, these two polymers have the advantage of being fully (PHBV) or partially (PBSA) bio-sourced. They concluded that their migration will take place in the case of very small nanoparticles with radii in the order of 1 nm, from polymer matrices
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