Confirming identity by mass
The first job of a peptide analysis is confirmation: is the material in the vial the sequence the label names. Mass spectrometry answers that directly, matching the observed mass-to-charge signal against the value expected for the intended structure. Identity either conforms or it does not, and the certificate says which.
Purity, and what a single number leaves out
Purity is usually reported as a percentage by peak area, and it is easy to read that figure as the whole story. It is not. Two materials can share the same headline purity yet differ in the substances that make up the remainder, which is why a defensible report separates the total from its parts.
- Purity as percent area, with the method and integration approach stated.
- A related-substances profile, so the non-target fraction is itemised rather than lumped together.
- Net peptide content, which reflects how much of the mass is actually the peptide.
- Residual solvent and moisture notes where the matrix calls for them.
How the certificate reflects the method
A result is only as clear as the method behind it, so the instrument, the reporting limit, and the acceptance criteria all appear on the document itself. Nothing is hidden in a footnote, and anyone holding the certificate can confirm it is authentic through the public verification tool.
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