Meaning
Categorization of chemical compound identification confidence in mass spectrometry relies on a standardized five-level framework. In non-targeted screening of polymer extractables, the schymanski identification scale provides this classification structure. It ranges from level one, where the identity is confirmed with an authentic standard, to level five, which indicates a minimum mass-to-charge ratio with no molecular information.
Applying this taxonomy prevents over-reporting and brings consistency to extractable screening reports.
Identification Confidence Level
Level three represents a tentative candidate structure supported by experimental mass spectra. Level two improves upon this by using library matches. This grading system ensures that chemical assignments are not overstated.
High Resolution Mass Spectrometry Validation
Moving from a lower level to a higher level on the Schymanski identification scale requires the acquisition of secondary analytical data. This process often involves matching the measured isotope pattern and the tandem mass spectrometry fragment patterns. When no standard is available, the compound remains at level two or three.
Non-Targeted Analysis Reporting
Compliance teams utilize this structured reporting system to prioritize toxicological risk assessments. Unknown substances that reside at level four or five cannot be easily evaluated for risk. This hierarchy prompts further structural analysis of the most abundant unknown compounds.
