Effect of ionizing radiation on the migration behavior and sensory properties of plastic packaging materials

Irradiation of packaging materials - in most cases plastics generally leads to a formation of free radicals and ions, with secondary effects such as cross-linking as well as oxidative chain scission. As a consequence, radiolysis products are generated which may induce off-odors in the packaging polymers as well as changes in migration characteristics. E.g. during irradiation, polymer additives may be destroyed, which may change the specific migration of additives and additive related decomposition products. The effects may have consequences on the quality and safety of the packed goods. The aim of this work was the investigation into irradiation induced migration in various packaging materials and a (semi)quantification of radiolysis products. In addition, the impact of ionizing radiation on sensory properties of the packaging materials was determined. The results are discussed in view of food packaging legislation requirements. (C) 2004 American Chemical Society.