Non Target Screening Workflows for Polyolefin Food Contact Oligomers
Non-target screening of polyolefin food contact oligomers requires dual GC-APCI and LC-HRMS analysis to resolve saturated aliphatic species below 1000 Da.
GC APCI MS
Meaning
An analytical technique that combines gas chromatography with atmospheric pressure chemical ionization and mass spectrometry to identify volatile and semi-volatile compounds is gc apci ms. This instrumentation is especially effective for analyzing polymer additives and non-intentionally added substances that undergo thermal degradation under harsh ionization conditions.
Ionization Mechanism
High temperatures in traditional electron ionization can cause extensive fragmentation of fragile polymer migrants, leaving the molecular ion undetectable. In gc apci ms, the analyte molecules are gently ionized at atmospheric pressure, which promotes the formation of protonated molecules or adducts. This soft ionization process preserves the molecular ion, providing molecular weight information that simplifies structure elucidation.
Analytical Utility
Identification of unknown compounds in polymer extracts relies on having both retention index data and accurate mass measurements. Coupling the separation efficiency of gas chromatography with high resolution mass analyzers allows laboratories to determine elemental compositions with high confidence. This hyphenated technique is highly effective for identifying complex mixtures of plasticizers and thermal degradation products in packaging films.
Polymer Characterization
When evaluating resin purity or looking for potential leachables, the high sensitivity of this system enables the detection of trace contaminants. Applying gc apci ms to recycled resins helps converters detect volatile contaminants that could affect the safety of the moulded product. By providing a clear molecular ion alongside characteristic fragment ions, the system enables the rapid screening of incoming raw materials to ensure they meet stringent purity standards before melt processing.