Migration of bisphenol A from can coatings to drinks

Abstract

Bisphenol A (4,4'-isopropylidene diphenol) in drinks was extracted with a polystyrene solid-phase cartridge, trimethylsilylized, then determined by GC/MS/SIM. Forty-seven commercial canned drinks were surveyed. The bisphenol A concentration and detection frequency in coffee, black tea and other tea drinks were 3.3-213 ng/mL (11/13), 8.5-90 ng/mL (4/9) and 3.7-22 ng/mL (5/8), respectively. In alcoholic drinks bisphenol A was detected in only one sample (13 ng/mL, 1/10) and none was detected in 7 soft drinks. As regards can coating materials, polyvinyl chloride coating of the lid might cause high migration of bisphenol A, followed by epoxy resin coating of both the lid and body, while epoxy resin coating of the lid and PET coating of the body caused only low migration. During the storage of canned drinks at 60°C, bisphenol A concentration was unchanged. The highest migration level of bisphenol A in a can was 40 μg in this test.