Meaning
Chromatographic separation protocols isolate low molecular weight oligomers originating from synthetic polyolefin matrixes during chemical migration analysis. Analytical laboratories perform POSH isolation to distinguish synthetic oligomers from external mineral oil saturated hydrocarbons originating from inks or recycled packaging. This procedure establishes the precise quantitative contribution of resin synthesis by-products in food simulant extracts.
Unclear separation leads to incorrect compliance failures by attributing native polymer oligomers to external mineral oil contamination.
Chromatographic Separation
Advanced liquid chromatography coupled with gas chromatography separates branched polyolefin oligomers from saturated mineral oil hydrocarbons. Executing POSH isolation resolves complex hydrocarbon humps into distinct peak patterns based on molecular structure and retention indices. Precise separation clarifies migrant origins.
Interference Elimination
Synthetic oligomers present in polyethylene and polypropylene films exhibit chromatographic retention behavior identical to saturated mineral oil hydrocarbons. Applying POSH isolation eliminates analytical interference, allowing chemists to isolate native oligomers from external contaminants during migration testing. Removing background noise ensures accurate regulatory reporting.
Migration Assessment
Quantifying native polyolefin oligomer migration into food simulants verifies resin safety under packaging regulations. Performing POSH isolation provides regulatory agencies with definitive evidence regarding whether migrating substances originate from the polymer matrix itself or external packaging inks. Precise measurement prevents unnecessary resin reformulations.
