Untargeted Mass Spectrometry Screening for Polyolefin Recyclate Compliance
High-resolution mass spectrometry screening paired with surrogate semi-quantification establishes food-contact compliance for post-consumer polyolefins.
Mass Spectrometry Screening Dossier
Meaning
Analytical documentation packages containing gas and liquid chromatography coupled with high-resolution mass spectrometry profiles map volatile and non-volatile chemical species in plastic resins. Compiling a mass spectrometry screening dossier enables resin buyers to identify non-intentionally added substances and degradation products before approval. The coverage spans low molecular weight oligomers, antioxidant breakdown products, plasticizers, and environmental contaminants in virgin or recycled polymers.
Analytical Protocol
Laboratory testing protocols combine electron ionization gas chromatography for volatile compounds with electrospray ionization liquid chromatography for polar non-volatile substances. A rigorous mass spectrometry screening dossier matches spectral fragmentation patterns against certified reference libraries and structural databases to assign tentative chemical structures. Quantitative estimation uses internal standards to calculate concentration levels for detected chemical peaks.
Detection Threshold
Analytical limits of quantitation must fall below target migration thresholds established for packaging materials. Generating a mass spectrometry screening dossier requires establishing specific signal-to-noise ratios across varying matrix background conditions. High matrix background from polymer oligomers can mask target analytical peaks, requiring advanced sample clean-up or solid-phase extraction techniques.
Downstream Risk
Unidentified chromatographic peaks represent compliance risks for packaging converters supplying regulated markets. Relying on a mass spectrometry screening dossier allows quality managers to reject resin lots containing toxicologically concerning migrants prior to moulding.