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analytical testing

Pillar Research Team

Peptide Identity vs Purity: What Each Result Means

A practical distinction between a result that supports molecular identity and a result that describes chromatographic purity under a specific method.

Questions to document

  • Is the identity result tied to the reported molecular mass?
  • Does the purity value state the analytical method?
  • Are impurities, counter-ions, water content, and method limits separately documented?

Sources and standards

This guide is educational and does not replace method validation, laboratory acceptance criteria, or a review of the exact batch documentation.