Migration from Polymeric Food Contact Material

Migration from Polymeric Food Contact Material 

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Migration from Polymeric Food Contact Material... 

Baner, A.L., Franz, R. and Piringer, O., 1994, Alternative methods for the determination and evaluation of migration potential from polymeric food contact materials. Deutsche Lehensmittel-Rundschau, 90(5), 137-143. and 90(6), 181-185. 

In this chapter, the main analytical techniques and the methods currently employed in industrial and research laboratories for the analysis of important classes of additives are reviewed. The use of both gas chromatographic and liquid chromatographic methods coupled with mass spectrometry features prominently. Such methodology enables the sensitive and specific detection of many types of organic additives in polymeric materials to parts per billion (jig/kg) levels. Much of the development of these methods has been undertaken as part of research into the migration or extraction of species from food-contact and medical materials [5-7], This chapter also includes some discussion on the analysis of residual monomers and solvents. 

All diffusion processes involving the transfer of a diffusantfrom or to a polymeric material asymptotically reaches a steady condition at long times. In any closed system (like a Tetra Pak carton) that has reached this condition, there is no effective mass transfer between the polymer and the surrounding phases the adjuvant concentrations are at equilibrium, and the transferred material is at the maximum possible amount In reference to Fig. 11.25 b, consider a sorption or migration process that has reached equilibrium. is the volume of contacting phase, and Vp is the volume of plastic in the container, and c y and c are the equilibrium concentrations of the adjuvant in the contacting phase and polymer, respectively. For the case of sorption of a substance from the food phase by the polymer, the mass balance at equilibrium is... 

Recommendations on express analysis of migration of low-polymeric substances from food-contact polymeric materials are given in EC Directives [5], Following these guidelines we conducted a replicate experiment for Formulations No 1 and No 4. 

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