Purita research journal
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Knowledge drives better research. Explore articles, practical guides and industry insights from Purita Peptides. Stay informed with expert content covering peptides, laboratory practices and the latest scientific developments.
- Peptide certificate of analysis (COA): What it is and how to read itA peptide certificate of analysis (COA) shows what a laboratory found when it tested a particular peptide sample. Depending on the tests performed, the report might include the peptide's identity, measured amount, chroma
- How to verify a peptide COA: A step-by-step guideTo verify a peptide Certificate of Analysis (COA), identify the testing laboratory, find the report number or verification key, and check the record through the laboratory's official website or contact channel. Then comp
- How peptide impurities are born: what can go wrong between synthesis and storagePeptide impurities are any components of a peptide sample other than the intended peptide. Some are the peptide itself in altered form: a residue missing or modified, or a change in structure. Others are process residues
- How HPLC peptide analysis works: from sample injection to chromatogramOpen an HPLC report for a research peptide and the chromatogram is usually the first thing you notice. One large peak, maybe a few smaller ones trailing behind it, retention times, and a purity figure – something like 99
- How to tell if research peptides are realThere is no visual test that can tell you whether a research peptide is authentic. A white lyophilized material may be the expected peptide, something else, or a mixture. Packaging does not settle the question either. An
- 99% pure – but 99% of what? Understanding peptide purityA research peptide can come with a 99% purity figure, but the number is easy to read too literally. It does not necessarily mean that 99% of everything in the vial is the target peptide and the remaining 1% is
- Endotoxins in research peptides: what they are, where they come from, and why they matterEndotoxins are easy to overlook when working with research peptides. There may be nothing unusual about the appearance of a sample, and no living bacteria need to be present. Yet bacterial material left behind earlier in
- Why yesterday’s COA can’t guarantee today’s peptide: the case for batch-by-batch testingA Certificate of Analysis can look reassuringly permanent. A research peptide was tested, the laboratory reported 99%+ purity, and the certificate was issued and uploaded. Months later, another batch of the same research