Meaning
Measurement technique providing mass values with enough decimal precision to determine the elemental composition of a molecule. Using high resolution accurate mass allows a laboratory to distinguish between two additives that share the same nominal weight but have different chemical formulas. This is essential when testing for non-intentionally added substances in food-grade packaging.
The precision of the tool prevents the misidentification of a harmless processing aid as a restricted phthalate. Most mass spectrometers in a typical plant lab lack the resolution to see the difference between a molecule of CO and a molecule of N2 because both weigh 28 units. High resolution accurate mass reveals the tiny difference in their nuclear binding energies.
Molecular Identity
Determination of the exact chemical structure requires measuring the mass to four or five decimal places. Standard equipment often rounds these values, which leads to ambiguity in complex polymer extracts. This method eliminates that doubt by isolating the specific isotopic pattern of the unknown substance.
It provides the certainty needed for regulatory filings.
Barrier Integrity
Trace levels of molecules migrating through a multi-layer film are identified using this sensitive approach. If a barrier layer fails, the detector picks up the specific mass signature of the outer resin. This data proves that the layers are not bonded correctly or that the functional barrier is too thin.
Migration Study
Testing for safety compliance requires quantifying how many milligrams of a chemical move from the plastic into a food simulant. High resolution accurate mass ensures that the result is not inflated by interference from other resin components. This accuracy protects the manufacturer from false reports of safety breaches.
