What HPLC purity, mass-spec identity, and net peptide content actually tell you when evaluating a research compound.
A certificate of analysis (COA) documents the identity and purity of a batch. The two figures researchers look at first are HPLC purity — typically reported as a percentage — and mass-spectrometry identity, which confirms the molecular weight matches the target sequence.
Net peptide content is a separate figure from purity: it accounts for water, counter-ions, and residual salts, and reflects how much actual peptide is present. Reputable suppliers make third-party COAs available on request.
This is general quality-assurance information for research use only.
All products are sold strictly for laboratory and research use only. They are not for human or veterinary consumption, and no medical, dosing, or usage guidance is provided. By ordering you confirm you are 18+ and acquiring these materials for legitimate research purposes.