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Cyclic oligomers were identified in PET bottles used for mineral water and fruit juice using MS and 1 H and 13 C 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...