High Purity Research Peptides: How Purity Is Tested, Measured, and Documented
The short version: Purity in research peptides is not a single number. It is a set of separate measurements, each answering a different question. HPLC purity tells you what share of the detector response belongs to the target peak. Mass spectrometry identity confirmation tells you whether the peptide sequence matches the reference standard. Measured content tells you how much peptide is actually in the vial. A supplier that publishes all three, tied to a specific lot number and an independent laboratory, is operating at the standard researchers should expect. One that publishes only a purity percentage is asking you to assume the rest. Search for high purity research peptides and you will find no shortage of suppliers advertising 99 percent purity. The number appears on product pages, in banner ads, and in social media posts. What the number does not tell you is how it was measured, which lot it…