Analysis of polyolefin oligomers and non-intentionally added substances (NIAS: oligomers, reaction products and impurities) according to Lommatzsch et al. (2015) by argentation high-performance liquid chromatography coupled to gas chromatography (LC-LCAg-GC-FID) and Biedermann et al. (2014) by two-dimensional gas chromatography (GCxGC):
NIAS including oligomers, reaction products and impurities are substances which are not intentionally added during the manufacturing of polymers. In general, these compounds were formed during synthesis/degradation or were added as impurities with the raw materials and additives. The investigation includes compounds with a molecular weight of roughly 100 – 600 Da, which are measurable by GC (volatile, non-degradable). The concentration of polyolefin oligomers were categorized in C16-24 (transfer via gaseous phase) and C24-35 (significant transfer only in direct food contact) in analogy to the analysis of mineral oil components.