UPLC-MS as a powerful technique for screening the nonvolatile contaminants in recycled PET

The possibility of using recycled polyethylene terephthalate as a food contact material is being seriously considered, but the potential migration of nonvolatile compounds from it must be assessed to ensure that it is safe to do so. In the study presented here, four samples of recycled PET were each...

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Bibliographic Details
Published in:Analytical and bioanalytical chemistry 2007-07, Vol.388 (5-6), p.1031-1038
Main Authors: Bentayeb, K, Batlle, R, Romero, J, Nerín, C
Format: Article
Language:English
Subjects:
Chemistry Techniques, Analytical - methods
Chromatography, Liquid - methods
Conservation of Natural Resources
Food Packaging
Ions
Mass Spectrometry - methods
Migration
Nonvolatile
Phthalic Acids - analysis
Plastics - analysis
Polyethylene Terephthalates - analysis
Polyethylene Terephthalates - chemistry
Recycled PET
Residuals
UPLC-MS
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Summary:The possibility of using recycled polyethylene terephthalate as a food contact material is being seriously considered, but the potential migration of nonvolatile compounds from it must be assessed to ensure that it is safe to do so. In the study presented here, four samples of recycled PET were each exposed to three food simulants under the harsh extraction conditions stipulated by European legislation regarding migration tests. The nonvolatile compounds that migrated from them were determined by ultra performance liquid chromatography-mass spectrometry using three different cone voltages, and both positive and negative ionization modes. A total of 36 chemical compounds were detected, some of which were identified, including common additives such as N,N'-di-beta-naphthyl-p-phenylenediamine (antioxidant) and 2,4-di-tert-butyl-6-(5-chloro-2H-benzotriazol-2-yl)phenol (light stabilizer) as well as degradation compounds such as ethylene terephthalate dimers and trimers. In addition, specific migration values of three common components of polyethylene terephthalate (diethylene glycol, terephthalic acid, and isophthalic acid) were determined and found to occur at levels of
ISSN:1618-2642
1618-2650
DOI:10.1007/s00216-007-1341-9