Untargeted Mass Spectrometry Screening for Polyolefin Recyclate Compliance
High-resolution mass spectrometry screening paired with surrogate semi-quantification establishes food-contact compliance for post-consumer polyolefins.
Migration Testing Simulants
Meaning
Laboratory evaluation of plastic packaging materials uses specialized test fluids to model the extraction behavior of foods. These chemical mixtures are defined as migration testing simulants. They represent acidic, alcoholic, and fatty food matrices to replicate the transfer of monomers or additives from the polymer.
These standardized fluids replace actual food products during laboratory trials to ensure high reproducibility and simplified chromatographic analysis.
Food Simulant Chemistry
Hydrophilic foods are represented by water or three percent acetic acid, while fatty foods require lipophilic media like olive oil. This chemical diversity ensures that the polymer migrants are tested under realistic stress.
Partition Coefficient
The speed of additive release from the polymer matrix into migration testing simulants depends on the thermodynamic affinity between the migrant and the test fluid. When a highly lipophilic additive encounters a fatty simulant, the rate of transfer increases. This behavior allows the laboratory to predict the maximum amount of substance that will enter the food during storage.
Standardized Testing Protocol
Molded containers are filled with the chosen fluid and held at a specified temperature for a defined duration. For instance, ten days at forty degrees Celsius simulates long-term storage at ambient temperature. This exposure routine delivers a quantifiable migration value that is compared to regulatory migration limits.