Meaning
Leaching of specific nitrogen-based compounds from packaging materials into food occurs when certain adhesives or pigments fail to react. Primary aromatic amine migration is a focus of safety audits because many of these substances are suspected carcinogens. These compounds typically originate from the breakdown of aromatic isocyanates used in lamination.
Chemical Origin
Unreacted monomers in polyurethane adhesives can migrate through the film layers and hydrolyze into amines upon contact with moisture. Some organic pigments used in printing inks also contribute to primary aromatic amine migration if they contain certain azo groups. Processors must ensure that the curing time for laminated films is sufficient to complete the chemical reaction.
Detection Limit
Laboratory analysis uses liquid chromatography with mass spectrometry to detect these substances at very low concentrations. The legal limit for primary aromatic amine migration is often set at the detection limit of the most sensitive analytical method. Testing must be performed on the finished article rather than the raw resin.
Safety Regulation
Regulations in many jurisdictions set a total limit for the sum of all detected amines. Failure to control primary aromatic amine migration results in product recalls and border rejections of imported goods. Moulders verify the safety of their components by requesting detailed compliance reports from their adhesive and ink suppliers.
