Identification of oligomers in polyethyleneterephthalate bottles for mineral water and fruit juice

Cyclic oligomers were identified in PET bottles used for mineral water and fruit juice using MS and 1H and 13C NMR: a first series cyclic trimer, a first series cyclic tetramer, a first series cyclic dimmer and a second series cyclic trimer. An analytical method to determine first series cyclic trimer in these bottles was developed and validated, using HPLC. The first series cyclic trimer levels were 316-462 mg/100 g of PET bottle.