Determining the migration of nadic acid, terephthalic acid, isophthalic acid and two oligomers from polyester food cans into food in the U.S. market

Abstract Concentrations of three monomers used in the manufacture of polyester resins for food cans, isophthalic acid (IPA), terephthalic acid (TA) and nadic acid (NA), and two oligomers were determined in canned food samples. All canned foods were purchased in local supermarkets in the United States. Concentrations of IPA and TA were determined to be from below the limit of detection in tomato sauce to 69 μg/kg in coconut milk, while the highest concentration of NA was found in pumpkin at 21 μg/kg. Estimated concentrations of oligomers in the food samples ranged from non-detect to 595 μg/kg. The influence of the storage time, lot type, and retail outlet on the migration concentrations was also investigated.