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Determination of adhesive acrylates in recycled polyethylene terephthalate by fabric phase sorptive extraction coupled to ultra performance liquid chromatography - mass spectrometry

Otoukesh, Mahdiyeh, Nerín, Cristina, Aznar, Margarita, Kabir, Abuzar, Furton, Kenneth G., Es'haghi, Zarrin
Journal of chromatography 2019 v.1602 pp. 56-63
acrylates, adhesives, bottles, composite polymers, detection limit, ethanol, ethylene glycol, fabrics, high performance liquid chromatography, mass spectrometry, polyethylene, polyethylene terephthalates, polypropylenes, sorbents, triethylene glycol, ultra-performance liquid chromatography
This article presents fabric phase sorptive extraction (FPSE) as a simple and effective pre-concentration method for the enrichment of acrylate compounds in different food simulants and subsequent analysis of the extracts by ultra-high-performance liquid chromatography with mass spectrometric detection (UPLC-MS). Acrylate compounds come from acrylic adhesives used commonly for sticking the paper labels on polyethylene terephthalate (PET) bottles and therefore, they may exist in recycled polyethylene terephthalate (rPET). Four acrylates were studied: ethylene glycol dimethacrylate (EGDM), pentaerythritol triacrylate (PETA), triethylene glycol diacrylate (TEGDA) and trimethylolpropane triacrylate (TMPTA). Five different types of FPSE media coated with different sol-gel sorbents were studied and finally sol-gel polyethylene glycol- polypropylene glycol-polyethylene glycol triblock copolymer (PEG-PPG-PEG) coated FPSE media was chosen for its satisfactory results. The optimal conditions affecting the extraction efficiency of compounds were determined in three different food simulants. Statistical evaluation of this method reveals good linearity and precision. Under the optimized conditions, the method provided limits of detection of the compounds in the range of (0.1–1.9 ng g−1, 0.1–1.2 ng g−1, 0.2–2.3 ng g−1) in EtOH 10%, HAc 3% and EtOH 20% and the enrichment factor values (EFs) after applying N2 were in the range of 11.1–25.0, 13.8–26.3, 8.3–21.9, in simulants A, B and C respectively. The optimized method was applied successfully to analyze thirteen types of recycled PET samples. Acrylates were found in some of the samples at ng g−1 levels.