Simulant Method
Safety evaluation of food contact materials using a modified polyphenylene oxide adsorbent provides a way to measure the transfer of volatile and semi-volatile substances. Tenax migration testing is the standard procedure for dry and fatty foods because this porous polymer has a high affinity for organic contaminants. The paper sample is placed in a cell with the adsorbent and kept at a specific temperature for a set duration.
This simulates the long term storage of a food product.
Chemical Adsorption
Pores within the Tenax particles trap the molecules that migrate out of the paper or board. After the exposure period, the adsorbent is extracted with a solvent to recover the chemicals for analysis.
Safety Validation
Results from this test allow manufacturers to predict whether mineral oils or other substances will contaminate the food during its shelf life. It is often used to verify the effectiveness of a functional barrier. Because Tenax is a much more aggressive sink for molecules than most foods, the test provides a conservative estimate of the risk.
Regulatory bodies across Europe accept this method for the certification of packaging safety. The choice of temperature and time depends on whether the food is stored at room temperature or in a freezer. Accurate execution requires precise control of the contact between the sample and the adsorbent.
This method has replaced more complex tests involving real food because it is easier to standardize.
