Why we publish this
Anyone can claim high purity. What distinguishes a claim from a fact is a batch-specific analytical document from a laboratory with no stake in the result. This article sets out what we test, how, and how you can verify it for the specific lot you receive.
Every lot is tested before release
We do not spot-check. Each production lot is tested before it is made available, and material is not released against a previous lot's results. The certificate of analysis you receive corresponds to the lot number printed on your vial.
The analytical panel
High-performance liquid chromatography (HPLC). This is the purity measurement. The sample is separated into its components and the target peptide's peak area is compared against total peak area. Our release threshold is 98 percent or above; typical batch results run higher. The chromatogram is included in the COA so you can assess peak shape and impurity profile yourself rather than relying on a single number.
Mass spectrometry. This is the identity measurement. Observed molecular weight is compared against the theoretical weight calculated from the peptide's sequence. HPLC tells you how pure the material is; mass spectrometry tells you what it is. Both are required — neither substitutes for the other.
Peptide content. Reported separately from purity, this states what proportion of the vial's mass is peptide rather than residual salts and water. Researchers doing quantitative work need this figure to calculate accurate concentrations.
Appearance and solubility. Visual inspection of the lyophilized cake and confirmation that the material dissolves cleanly.
Independent testing
Analysis is performed by an external, accredited laboratory. This matters for a straightforward reason: a supplier testing its own product and reporting its own results has an obvious conflict of interest. Third-party results are not immune to error, but they remove the incentive problem, and the testing laboratory is named on the certificate so the chain is traceable.
Traceability
Every vial carries a lot number. That number ties to:
- The certificate of analysis for that specific batch
- The synthesis date
- The analytical results described above
If a result in your work looks anomalous, this chain lets you check whether the material is a plausible explanation. Without lot-level traceability, that diagnostic path does not exist.
Cold-chain and packaging
Lyophilized peptides are stable at ambient temperature for the short duration of transit, but we ship in insulated packaging as standard rather than relying on that margin. Outer packaging is plain and unmarked, with no product identification visible externally.
How to verify your material
- Check the lot number on the vial against the certificate of analysis supplied.
- Confirm the COA is dated and names the testing laboratory.
- Review the HPLC chromatogram — look at peak shape and the impurity profile, not just the headline percentage.
- Confirm observed and theoretical molecular weights agree on the mass spectrometry result.
- Note the peptide content figure for your concentration calculations.
If anything on the document does not match what you received, contact us and we will resolve it. A COA that cannot be reconciled with the vial in front of you is a problem worth raising, with any supplier.
Research use only. This content is for educational and informational purposes related to scientific research. It is not medical advice and does not describe dosing or administration for human use. Products are sold for laboratory research by qualified professionals only.