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Peptides MEX

Peptides MEX / Glossary

Purity ≥99%: what a percentage actually measures

A percentage needs a calculation basis and an identified sample to become useful information.

Updated · Sources and editorial standards

The basis of the percentage

A chromatographic estimate may be calculated from peak areas. Signal proportion is not automatically a fraction of total mass: detector response and calculation delimit the result. Purity ≥99% without a method leaves the measured property undefined.

Sources: [1][3]

Which questions remain open

Look for batch, method, detector and components included in the calculation. Identity, content and potency need their own evaluation. If a certificate reports only chromatographic purity, do not extend it to sterility, endotoxin absence or clinical suitability.

Sources: [1][2]

Questions about this reference

Does this entry claim the catalog has ≥99% purity?

No. It explains the expression; it does not certify materials or results for any batch.

[1][2]

Sources and original reading

  1. Agilent OpenLab CDS for Automated High Throughput Purity Assessment Using Mass Spectrometry — Part I
  2. FDA: Part IV — Analytical
  3. NIST archived RM 8327 report: UV area purity and peptide mass purity

Content updated: . How this content is prepared and checked.