LC-MS identity on a Peptara Labs certificate is a mass check. It measures the mass to charge ratio of the separated material and compares it with the expected mass for the named compound. A match fits the named compound but can't by itself rule out a different molecule of the same mass, such as an isomer. That's why the panel pairs it with a retention time match. Neither identity line tells you how much is there. That's the purity line's job.
How does Peptara Labs confirm the identity of a peptide?
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Peptara Labs says identity on its panels is confirmed by a retention time match and by LC-MS, the mass to charge measurement recorded by Titreon Analytical. For its BPC-157 batch the panel records 1419.5 Da, and for its retatrutide batch 4731.4 Da, each matched against the expected mass. A matching mass fits the named compound but doesn't by itself rule out a molecule of the same mass. Certificates are at peptaralabs.io/coa. A certificate shows what one lot tested as; it does not show a product is safe or approved for use in people.
01 / What do the identity lines measure?
Mass spectrometry checks that the measured mass matches the expected mass for the named compound. It doesn't say how much of the material that compound makes up. A retention time match places the main peak in time against a reference. The panel runs both, because a mass match can't rule out a same-mass molecule, and a time match carries no mass information.
Together they answer what purity can't: not how much, but which. The mass match narrows down which compound is there. The area percentage splits it up. A document with only one of the two is half a record.
Does a mass measurement report how pure the peptide is?
No. A mass match fits the named compound and says nothing about how much of the material it makes up. That's the chromatographic purity line, checked against a release criterion. A record with only one of the two is half a panel. Both lines are at peptaralabs.io/coa.
02 / Where does a mass match stop?
It fits the named compound, and says nothing about how much is there.
The compound gets named. The amount is left to the purity line. Reading a mass match as purity is the reader's step, not the instrument's. It works the other way too: a high purity figure names nothing, which is the point of why a purity figure names nothing.
03 / Where did we read it?
From the Titreon Analytical panel at peptaralabs.io/coa, identity block. We treat the retention time line and the mass line as two measurements, because that's how the panel prints them.
Which laboratory runs Peptara Labs identity testing?
Peptara Labs names Titreon Analytical, described on its certificate pages as a third-party laboratory whose quality system is aligned to ISO/IEC 17025:2017, not itself accredited, as its tester. The identity lines, the retention time match and the LC-MS mass, come from that lab's panel. It's at peptaralabs.io/coa.