Abstract: In this paper, microwave susceptors in the microwave popcorn bags were immerged into corn oil. When the system was heated in a microwave oven, some nonvolatile ultraviolet absorbing species were migrated into the corn oil. Such nonvolatile ultraviolet absorbing species were then extracted by hexane-acetonitrile. With water bath and a gentle nitrogen stream, the extract was dried and concentrated, and subsequently kept as a solution of dimethylacetamide of 2mL. The extract was finally separated with a high performance liquid chromatography and weighed. The weights of the extracts for four samples were 93.3, 134.1, 38.4, and 11.8μg/in2 respectively. Only one of these samples was below the FDA's safety limit standard of 20 μg/in2.

Key words: microwave popcorn, microwave susceptor, nonvolatile ultraviolet absorbing extractables, migration