Migration of Patulin in Apples

The migration of patulin in apples was studied. A patulin-producing Penicillium expansum strain, isolated from apples, was inoculated in sound apples. Patulin was extracted and its migration was studied in each centimeter from the point of inoculation. Trimming just the rotten tissue was not enough to exclude all patulin. At 1 cm from the periphery of the rotten area, no patulin could be detected.